diff --git a/build_make.sh b/build_make.sh
index 197ae47..96ae49d 100644
--- a/build_make.sh
+++ b/build_make.sh
@@ -78,7 +78,7 @@ function update_dcc_dependency() {
     fi
 
     if [ "x${THIRD_BIN_PATH}" != "x" ]; then
-        local dccHome="${THIRD_BIN_PATH}/kernel/component/dcc"
+        local dcc_home="${THIRD_BIN_PATH}/kernel/component/dcc"
 
         if [ -d "${dcc_home}" ]; then
             echo "We well get dcc lib from 3rd[${dcc_home}]."
diff --git a/src/cm_adapter/cm_sharedisk_adapter/cm_ddb_sharedisk.cpp b/src/cm_adapter/cm_sharedisk_adapter/cm_ddb_sharedisk.cpp
index 2031374..031e50d 100644
--- a/src/cm_adapter/cm_sharedisk_adapter/cm_ddb_sharedisk.cpp
+++ b/src/cm_adapter/cm_sharedisk_adapter/cm_ddb_sharedisk.cpp
@@ -20,6 +20,7 @@
  *
  * -------------------------------------------------------------------------
  */
+#include <limits.h>
 #include "cm/cm_c.h"
 #include "cm/cm_elog.h"
 #include "cm_disk_rw.h"
@@ -33,8 +34,24 @@ static DDB_ROLE g_notifySd = DDB_ROLE_UNKNOWN;
 static DDB_ROLE g_dbRole = DDB_ROLE_FOLLOWER;
 static uint32 g_cmServerNum = 0;
 static int64 g_waitForTime = 0;
-static volatile int64 g_waitForChangeTime = 0;
+static volatile int64 g_notifyBeginSec = 0;
 const uint32 ONE_PRIMARY_ONE_STANDBY = 2;
+static DdbArbiCon *g_arbiCon = NULL;
+static const time_t MAX_VALID_LOCK_TIME = 125;
+static const time_t BASE_VALID_LOCK_TIME = 1;
+static const uint32 DEFAULT_CMD_TIME_OUT = 2;
+
+typedef enum en_persist_cmd_type {
+    CMD_LOCK = 0,
+    CMD_FORCE_LOCK = 1,
+} PERSIST_CMD_TYPE;
+
+typedef struct SdArbitrateDataSt {
+    uint32 lockNotRefreshTimes;
+    time_t lockFailBeginTime;
+    time_t lockTime;
+    DDB_ROLE lastDdbRole;
+} SdArbitrateData;
 
 static status_t SdLoadApi(const DrvApiInfo *apiInfo);
 
@@ -184,14 +201,15 @@ static void DrvNotifySd(DDB_ROLE dbRole)
         return;
     }
 
-    if (g_dbRole != dbRole && g_cmServerNum > ONE_PRIMARY_ONE_STANDBY) {
-        if (dbRole == DDB_ROLE_FOLLOWER) {
-            (void)pthread_rwlock_wrlock(&g_notifySdLock);
-            g_waitForChangeTime = g_waitForTime;
-            g_notifySd = DDB_ROLE_FOLLOWER;
-            ddbNotiStatusFun(DDB_ROLE_FOLLOWER);
-            (void)pthread_rwlock_unlock(&g_notifySdLock);
-        }
+    if (g_dbRole != dbRole) {
+        struct timespec checkBegin = {0, 0};
+        (void)clock_gettime(CLOCK_MONOTONIC, &checkBegin);
+
+        (void)pthread_rwlock_wrlock(&g_notifySdLock);
+        g_notifyBeginSec = checkBegin.tv_sec;
+        g_notifySd = dbRole;
+        ddbNotiStatusFun(dbRole);
+        (void)pthread_rwlock_unlock(&g_notifySdLock);
         write_runlog(LOG, "receive notify msg, it has set ddb role, dbRole is [%d: %d], g_waitForTime is %ld, "
             "g_cmServerNum is %u.\n", (int32)dbRole, (int32)g_dbRole, g_waitForTime, g_cmServerNum);
     }
@@ -248,47 +266,287 @@ static void NotifyDdbRole(DDB_ROLE *lastDdbRole)
     *lastDdbRole = g_dbRole;
 }
 
+static uint32 GetForceLockTimeOutCfg()
+{
+    uint32 curForceLockTimeOut = g_arbiCon->arbiCfg->haHeartBeatTimeOut;
+    if (curForceLockTimeOut < DEFAULT_CMD_TIME_OUT) {
+        curForceLockTimeOut = DEFAULT_CMD_TIME_OUT;
+    }
+    return curForceLockTimeOut;
+}
+
+int ExecuteLockCmd(const char *cmd)
+{
+    int ret = system(cmd);
+    if (ret == -1) {
+        write_runlog(ERROR, "Fail to execute command %s, and errno=%d.\n", cmd, errno);
+        return -1;
+    }
+
+    write_runlog(DEBUG1, "execute command %s exit code %d.\n", cmd, ret);
+    if (WIFEXITED(ret)) {
+        return WEXITSTATUS(ret);
+    }
+
+    write_runlog(ERROR, "Fail to execute command %s, script exit code %d.\n", cmd, ret);
+    return -1;
+}
+
+static bool CheckDemoteDdbRole(SdArbitrateData *sdArbitrateData)
+{
+    if (sdArbitrateData->lastDdbRole != DDB_ROLE_LEADER) {
+        sdArbitrateData->lockFailBeginTime = 0;
+        return true;
+    }
+
+    uint32 forceLockTimeOut = GetForceLockTimeOutCfg();
+    uint32 exeCmdTwiceTimeOut = DEFAULT_CMD_TIME_OUT + DEFAULT_CMD_TIME_OUT;
+    if (exeCmdTwiceTimeOut >= forceLockTimeOut) {
+        sdArbitrateData->lockFailBeginTime = 0;
+        return true;
+    }
+
+    // try to avoid execute cmd timeout, so use diff time to demote cms primary
+    uint32 diffTimeOut = forceLockTimeOut - exeCmdTwiceTimeOut;
+    struct timespec time = {0, 0};
+    (void)clock_gettime(CLOCK_MONOTONIC, &time);
+    time_t minusTime = time.tv_sec - sdArbitrateData->lockFailBeginTime;
+    if (minusTime >= diffTimeOut) {
+        write_runlog(LOG,
+            "CheckDemoteDdbRole: CMS primary will demote for current time %ld, lockFailBeginTime %ld, diffTimeOut "
+            "%u.\n",
+            time.tv_sec,
+            sdArbitrateData->lockFailBeginTime,
+            diffTimeOut);
+        return true;
+    }
+    write_runlog(LOG,
+        "CheckDemoteDdbRole: CMS primary demote will wait %u seconds for current time %ld, lockFailBeginTime %ld, "
+        "diffTimeOut %u.\n",
+        (uint32)(diffTimeOut - minusTime),
+        time.tv_sec,
+        sdArbitrateData->lockFailBeginTime,
+        diffTimeOut);
+
+    return false;
+}
+
+static void CmNormalArbitrate(const char *lockCmd, SdArbitrateData *sdArbitrateData)
+{
+    int lockRst = ExecuteLockCmd(lockCmd);
+
+    write_runlog(DEBUG1,
+        "CmNormalArbitrate: execute lock cmd %s result %d. lockTime %ld, lockNotRefreshTimes %u, lockFailBeginTime "
+        "%ld\n", lockCmd, lockRst, sdArbitrateData->lockTime, sdArbitrateData->lockNotRefreshTimes,
+        sdArbitrateData->lockFailBeginTime);
+    if (lockRst == 0) {
+        // get lock success, notify cmserver to primary
+        sdArbitrateData->lockTime = 0;
+        sdArbitrateData->lockNotRefreshTimes = 0;
+        sdArbitrateData->lockFailBeginTime = 0;
+        g_dbRole = DDB_ROLE_LEADER;
+        NotifyDdbRole(&sdArbitrateData->lastDdbRole);
+        return;
+    }
+
+    if (lockRst >= BASE_VALID_LOCK_TIME && lockRst <= MAX_VALID_LOCK_TIME) {
+        g_dbRole = DDB_ROLE_FOLLOWER;
+        sdArbitrateData->lockFailBeginTime = 0;
+        // get lock failed, check lock time if refreshed by other process
+        if (sdArbitrateData->lockTime != lockRst) {
+            sdArbitrateData->lockTime = lockRst;
+            sdArbitrateData->lockNotRefreshTimes = 0;
+        } else {
+            const uint32 defaultNotRefreshTimes = 2;
+            uint32 curForceLockTimeOut = GetForceLockTimeOutCfg();
+            int logLevel = sdArbitrateData->lockNotRefreshTimes >= defaultNotRefreshTimes ? LOG : DEBUG1;
+            write_runlog(logLevel,
+                "CmNormalArbitrate: other cmserver maybe lost lock for %u times, current lock time %ld\n",
+                sdArbitrateData->lockNotRefreshTimes, sdArbitrateData->lockTime);
+            if (sdArbitrateData->lockNotRefreshTimes < curForceLockTimeOut) {
+                ++sdArbitrateData->lockNotRefreshTimes;
+            } else {
+                sdArbitrateData->lockNotRefreshTimes = 0;
+                char forceLockCmd[MAX_PATH_LEN] = {0};
+                errno_t rc = snprintf_s(forceLockCmd, MAX_PATH_LEN, MAX_PATH_LEN - 1,
+                    "timeout -s SIGKILL %us cm_persist %s %ld %lu %d %ld > /dev/null 2>&1",
+                    DEFAULT_CMD_TIME_OUT, g_cmsArbitrateDiskHandler.scsiDev, g_cmsArbitrateDiskHandler.instId,
+                    g_cmsArbitrateDiskHandler.offset, (int)CMD_FORCE_LOCK, sdArbitrateData->lockTime);
+                securec_check_intval(rc, (void)rc);
+                lockRst = ExecuteLockCmd(forceLockCmd);
+                g_dbRole = ((lockRst == 0) ? DDB_ROLE_LEADER : DDB_ROLE_FOLLOWER);
+                write_runlog(LOG, "CmNormalArbitrate: exe force lock cmd %s result %d, curForceLockTime %u.\n",
+                    forceLockCmd, lockRst, curForceLockTimeOut);
+            }
+        }
+        NotifyDdbRole(&sdArbitrateData->lastDdbRole);
+        return;
+    }
+
+    // get lock time failed
+    sdArbitrateData->lockTime = 0;
+    sdArbitrateData->lockNotRefreshTimes = 0;
+    g_dbRole = CheckDemoteDdbRole(sdArbitrateData) ? DDB_ROLE_FOLLOWER : DDB_ROLE_LEADER;
+    NotifyDdbRole(&sdArbitrateData->lastDdbRole);
+}
+
+static bool CheckResetTime()
+{
+    struct timespec checkEnd = {0, 0};
+    (void)clock_gettime(CLOCK_MONOTONIC, &checkEnd);
+    int64 diffSeconds = checkEnd.tv_sec - g_notifyBeginSec;
+    if (diffSeconds <= g_waitForTime) {
+        write_runlog(DEBUG1,
+            "CheckResetTime: current time %ld, g_notifyBeginSec %ld, g_waitTime %ld, cannot reset g_notifySd.\n",
+            (long int)checkEnd.tv_sec, g_notifyBeginSec, g_waitForTime);
+        return false;
+    }
+
+    return true;
+}
+
+static bool CheckSdDemote(SdArbitrateData *sdArbitrateData)
+{
+    if (g_notifySd != DDB_ROLE_FOLLOWER) {
+        return false;
+    }
+
+    if (g_dbRole == DDB_ROLE_LEADER) {
+        g_dbRole = DDB_ROLE_FOLLOWER;
+        NotifyDdbRole(&sdArbitrateData->lastDdbRole);
+        return true;
+    }
+    
+    if (!CheckResetTime()) {
+        return true;
+    }
+
+    write_runlog(LOG,
+        "CheckSdDemote: will reset g_notifySd from %u to %u after wait %ld time.\n",
+        (uint32)g_notifySd,
+        (uint32)DDB_ROLE_UNKNOWN,
+        g_waitForTime);
+    g_notifySd = DDB_ROLE_UNKNOWN;
+    return false;
+}
+
+static status_t ExePromoteCmd(const char *lockCmd, SdArbitrateData *sdArbitrateData)
+{
+    int st = ExecuteLockCmd(lockCmd);
+    if (st != 0) {
+        write_runlog(WARNING, "ExePromoteCmd: Execute get lock cmd %s failed, lockResult %d!\n", lockCmd, st);
+        if (st >= BASE_VALID_LOCK_TIME && st <= MAX_VALID_LOCK_TIME) {
+            char forceLockCmd[MAX_PATH_LEN] = {0};
+            errno_t rc = snprintf_s(forceLockCmd,
+                MAX_PATH_LEN,
+                MAX_PATH_LEN - 1,
+                "timeout -s SIGKILL %us cm_persist %s %ld %lu %d %ld > /dev/null 2>&1",
+                DEFAULT_CMD_TIME_OUT,
+                g_cmsArbitrateDiskHandler.scsiDev,
+                g_cmsArbitrateDiskHandler.instId,
+                g_cmsArbitrateDiskHandler.offset,
+                (int)CMD_FORCE_LOCK,
+                st);
+            securec_check_intval(rc, (void)rc);
+            st = ExecuteLockCmd(forceLockCmd);
+            if (st != 0) {
+                write_runlog(WARNING, "ExePromoteCmd: Execute force lock cmd %s failed, result %d!\n", lockCmd, st);
+                return CM_ERROR;
+            }
+            return CM_SUCCESS;
+        }
+
+        return CM_ERROR;
+    }
+
+    sdArbitrateData->lockTime = 0;
+    sdArbitrateData->lockNotRefreshTimes = 0;
+    sdArbitrateData->lockFailBeginTime = 0;
+    write_runlog(DEBUG1, "ExePromoteCmd: Execute get lock cmd %s success!\n", lockCmd);
+    return CM_SUCCESS;
+}
+
+static bool CheckSdPromote(const char *lockCmd, SdArbitrateData *sdArbitrateData)
+{
+    if (g_notifySd != DDB_ROLE_LEADER) {
+        return false;
+    }
+
+    if (g_dbRole != DDB_ROLE_LEADER) {
+        (void)ExePromoteCmd(lockCmd, sdArbitrateData);
+        g_dbRole = DDB_ROLE_LEADER;
+        NotifyDdbRole(&sdArbitrateData->lastDdbRole);
+        return true;
+    }
+
+    (void)ExePromoteCmd(lockCmd, sdArbitrateData);
+
+    if (!CheckResetTime()) {
+        return true;
+    }
+
+    write_runlog(LOG,
+        "CheckSdPromote: will reset g_notifySd from %u to %u after wait %ld seconds.\n",
+        (uint32)g_notifySd,
+        (uint32)DDB_ROLE_UNKNOWN,
+        g_waitForTime);
+    g_notifySd = DDB_ROLE_UNKNOWN;
+    return false;
+}
+
+static bool HaveNotifySd(const char *lockCmd, SdArbitrateData *sdArbitrateData)
+{
+    bool res = false;
+    (void)pthread_rwlock_wrlock(&g_notifySdLock);
+    if (g_notifySd == DDB_ROLE_FOLLOWER) {
+        res = CheckSdDemote(sdArbitrateData);
+    } else if (g_notifySd == DDB_ROLE_LEADER) {
+        res = CheckSdPromote(lockCmd, sdArbitrateData);
+    }
+    (void)pthread_rwlock_unlock(&g_notifySdLock);
+    return res;
+}
+
 static void *GetShareDiskLockMain(void *arg)
 {
     thread_name = "GetShareDiskLockMain";
     write_runlog(LOG, "Starting get share disk lock thread.\n");
-    char cmd[MAX_PATH_LEN] = {0};
-    errno_t rc = snprintf_s(cmd,
+    char lockCmd[MAX_PATH_LEN] = {0};
+    errno_t rc = snprintf_s(lockCmd,
         MAX_PATH_LEN,
         MAX_PATH_LEN - 1,
-        "cm_persist %s %ld %lu > /dev/null 2>&1",
+        "timeout -s SIGKILL %us cm_persist %s %ld %lu %d > /dev/null 2>&1",
+        DEFAULT_CMD_TIME_OUT,
         g_cmsArbitrateDiskHandler.scsiDev,
         g_cmsArbitrateDiskHandler.instId,
-        g_cmsArbitrateDiskHandler.offset);
+        g_cmsArbitrateDiskHandler.offset,
+        (int)CMD_LOCK);
     securec_check_intval(rc, (void)rc);
-    int st;
-    DDB_ROLE lastDdbRole = DDB_ROLE_UNKNOWN;
+
+    SdArbitrateData sdArbitrateData;
+    rc = memset_s(&sdArbitrateData, sizeof(SdArbitrateData), 0, sizeof(SdArbitrateData));
+    securec_check_errno(rc, (void)rc);
+    struct timespec checkBegin = {0, 0};
+    struct timespec checkEnd = {0, 0};
+    uint32 twoSec = 2;
 
     for (;;) {
-        if (g_cmServerNum > ONE_PRIMARY_ONE_STANDBY) {
-            (void)pthread_rwlock_wrlock(&g_notifySdLock);
-            if (g_notifySd == DDB_ROLE_FOLLOWER && g_waitForChangeTime > 0) {
-                g_dbRole = DDB_ROLE_FOLLOWER;
-                NotifyDdbRole(&lastDdbRole);
-                g_waitForChangeTime--;
-                (void)pthread_rwlock_unlock(&g_notifySdLock);
-                write_runlog(DEBUG1,
-                    "GetShareDiskLockMain: current ddbRole is %d, g_waitForChangeTime is %ld.\n",
-                    (int)g_dbRole,
-                    g_waitForChangeTime);
-                (void)sleep(1);
-                continue;
+        (void)clock_gettime(CLOCK_MONOTONIC, &checkBegin);
+        if (!HaveNotifySd(lockCmd, &sdArbitrateData)) {
+            if (sdArbitrateData.lockFailBeginTime == 0) {
+                sdArbitrateData.lockFailBeginTime = checkBegin.tv_sec;
             }
-
-            g_notifySd = DDB_ROLE_UNKNOWN;
-            (void)pthread_rwlock_unlock(&g_notifySdLock);
+            CmNormalArbitrate(lockCmd, &sdArbitrateData);
+        }
+        (void)clock_gettime(CLOCK_MONOTONIC, &checkEnd);
+        uint32 second = (uint32)(checkEnd.tv_sec - checkBegin.tv_sec);
+        int64 nanosecond = checkEnd.tv_nsec - checkBegin.tv_nsec;
+        if (second > twoSec) {
+            write_runlog(
+                LOG, "it takes %u seconds %ld nanoseconds to cmserver share disk arbitrate.\n", second, nanosecond);
+        } else {
+            (void)sleep(1);
         }
-
-        st = system(cmd);
-        g_dbRole = (st == 0) ? DDB_ROLE_LEADER : DDB_ROLE_FOLLOWER;
-        NotifyDdbRole(&lastDdbRole);
-
-        (void)sleep(1);
     }
     return NULL;
 }
@@ -310,6 +568,7 @@ static status_t CreateShareDiskThread(const DrvApiInfo *apiInfo)
         write_runlog(ERROR, "Failed to start get share disk lock thread.\n");
         return CM_ERROR;
     }
+    g_arbiCon = apiInfo->cmsArbiCon;
     pthread_t thrId;
     int32 res = pthread_create(&thrId, NULL, GetShareDiskLockMain, NULL);
     if (res != 0) {
@@ -350,8 +609,8 @@ static status_t SdLoadApi(const DrvApiInfo *apiInfo)
     if (st != CM_SUCCESS) {
         return st;
     }
-    st = CreateShareDiskThread(apiInfo);
-    return st;
+
+    return CreateShareDiskThread(apiInfo);
 }
 
 DdbDriver *DrvSdGet(void)
diff --git a/src/cm_adapter/cm_sharediskapi/cm_voting_disk.cpp b/src/cm_adapter/cm_sharediskapi/cm_voting_disk.cpp
index 8af6273..d3f8545 100644
--- a/src/cm_adapter/cm_sharediskapi/cm_voting_disk.cpp
+++ b/src/cm_adapter/cm_sharediskapi/cm_voting_disk.cpp
@@ -189,10 +189,10 @@ status_t InitVotingDisk(const char *votingDiskPath)
     return CM_SUCCESS;
 }
 
-VotingDiskStatus GetNodeHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout)
+VotingDiskStatus GetNodeHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout, int logLevel)
 {
     if (nodeIndex >= VOTING_DISK_MAX_NODE_NUM) {
-        write_runlog(ERROR, "[%s] node index %u exceeds max node number of voting disk .\n", __FUNCTION__, nodeIndex);
+        write_runlog(logLevel, "[%s] node index %u exceeds max node of voting disk .\n", __FUNCTION__, nodeIndex);
         return VOTING_DISK_STATUS_UNAVAIL;
     }
     if (diskTimeout == 0) {
@@ -211,7 +211,7 @@ VotingDiskStatus GetNodeHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout)
 
     time_t curTime = time(NULL);
     if (IsRhbTimeout(g_heartbeat[nodeIndex], curTime, (int)diskTimeout)) {
-        write_runlog(ERROR, "[%s] nodeIndex %u heartbeat timeout, diskTimeout=%u, nodeTime: %s\n",
+        write_runlog(logLevel, "[%s] nodeIndex %u heartbeat timeout, diskTimeout=%u, nodeTime: %s\n",
             __FUNCTION__, nodeIndex, diskTimeout, timeBuf);
         return VOTING_DISK_STATUS_UNAVAIL;
     }
diff --git a/src/cm_agent/client_adpts/libpq/cma_datanode.cpp b/src/cm_agent/client_adpts/libpq/cma_datanode.cpp
index 9b6f083..403db20 100644
--- a/src/cm_agent/client_adpts/libpq/cma_datanode.cpp
+++ b/src/cm_agent/client_adpts/libpq/cma_datanode.cpp
@@ -602,6 +602,20 @@ int CheckDatanodeStatus(const char *dataDir, int *role)
     return 0;
 }
 
+static bool IsConnBadButNotPhonyDead(const char *errMsg, int conResult)
+{
+    if (strstr(errMsg, "too many clients already")) {
+        write_runlog(LOG, "need to change conn pool number, conn result is %d.\n", conResult);
+        return true;
+    }
+    if (strstr(errMsg, "failed to request snapshot")) {
+        write_runlog(LOG, "failed to request snapshot, not phony dead, conn result is %d.\n", conResult);
+        return true;
+    }
+
+    return false;
+}
+
 int CheckDnStausPhonyDead(int dnId, int agentCheckTimeInterval)
 {
     int agentConnectDb = 5;
@@ -624,8 +638,7 @@ int CheckDnStausPhonyDead(int dnId, int agentCheckTimeInterval)
     if (!IsConnOk(tmpDNConn)) {
         write_runlog(ERROR, "get connect failed for dn(%s) phony dead check, errmsg is %s\n",
             pidPath, ErrorMessage(tmpDNConn));
-        if (strstr(ErrorMessage(tmpDNConn), "too many clients already")) {
-            write_runlog(LOG, "need to change conn pool number, conn result is %d.\n", Status(tmpDNConn));
+        if (IsConnBadButNotPhonyDead(ErrorMessage(tmpDNConn), Status(tmpDNConn))) {
             close_and_reset_connection(tmpDNConn);
             return 0;
         }
diff --git a/src/cm_agent/cma_instance_management_res.cpp b/src/cm_agent/cma_instance_management_res.cpp
index 2127e6b..0ae3b04 100644
--- a/src/cm_agent/cma_instance_management_res.cpp
+++ b/src/cm_agent/cma_instance_management_res.cpp
@@ -57,7 +57,7 @@ int SystemExecute(const char *scriptPath, const char *oper, uint32 timeout)
     return -1;
 }
 
-void StartOneResInst(const CmResConfList *conf)
+status_t StartOneResInst(const CmResConfList *conf)
 {
     char oper[MAX_OPTION_LEN] = {0};
     int ret = snprintf_s(oper, MAX_OPTION_LEN, MAX_OPTION_LEN - 1, "-start %u %s", conf->resInstanceId, conf->arg);
@@ -66,9 +66,15 @@ void StartOneResInst(const CmResConfList *conf)
     ret = SystemExecute(conf->script, oper, (uint32)conf->checkInfo.timeOut);
     if (ret == 0) {
         write_runlog(LOG, "StartOneResInst: run start script (%s %s) successfully.\n", conf->script, oper);
+    } else if (ret == CUS_RES_START_FAIL_DEPEND_NOT_ALIVE) {
+        write_runlog(LOG, "StartOneResInst: res(%s) inst(%u) can't do restart, cause depend resource inst not alive.\n",
+            conf->resName, conf->cmInstanceId);
+        return CM_ERROR;
     } else {
         write_runlog(ERROR, "StartOneResInst: run start script (%s %s) failed, ret=%d.\n", conf->script, oper, ret);
     }
+
+    return CM_SUCCESS;
 }
 
 void StopOneResInst(const CmResConfList *conf)
@@ -93,6 +99,13 @@ void OneResInstShutdown(const CmResConfList *oneResConf)
     }
 }
 
+void OneResInstClean(const CmResConfList *oneResConf)
+{
+    if (CheckOneResInst(oneResConf) != CUS_RES_CHECK_STAT_OFFLINE) {
+        (void)CleanOneResInst(oneResConf);
+    }
+}
+
 status_t RegOneResInst(const CmResConfList *conf, uint32 destInstId)
 {
     char oper[MAX_OPTION_LEN] = {0};
@@ -171,10 +184,20 @@ status_t CleanOneResInst(const CmResConfList *conf)
     return CM_SUCCESS;
 }
 
+static inline void CleanOneInstCheckCount(CmResConfList *resConf)
+{
+    if (resConf->checkInfo.startCount != 0) {
+        write_runlog(LOG, "res(%s) inst(%u) restart times will clean.\n", resConf->resName, resConf->cmInstanceId);
+    }
+    resConf->checkInfo.startCount = 0;
+    resConf->checkInfo.startTime = 0;
+    resConf->checkInfo.brokeTime = 0;
+}
+
 void StopAllResInst()
 {
     for (uint32 i = 0; i < GetLocalResConfCount(); ++i) {
-        (void)CleanOneResInst(&g_resConf[i]);
+        OneResInstClean(&g_resConf[i]);
     }
 }
 
@@ -214,8 +237,7 @@ static void ManualStopLocalResInst(CmResConfList *conf)
         write_runlog(ERROR, "manual stop res(%s) inst(%u) failed, ret=%d.\n", conf->resName, conf->resInstanceId, ret);
     } else {
         write_runlog(LOG, "manual stop res(%s) inst(%u) success.\n", conf->resName, conf->resInstanceId);
-        conf->checkInfo.startCount = 0;
-        conf->checkInfo.startTime = 0;
+        CleanOneInstCheckCount(conf);
     }
 }
 
@@ -231,29 +253,29 @@ bool IsInstManualStopped(uint32 instId)
     return false;
 }
 
-static bool CanCusInstDoStart(const CmResConfList *conf)
+static bool CanCusInstDoRestart(const CmResConfList *conf)
 {
     ResIsregStatus stat = IsregOneResInst(conf, conf->resInstanceId);
     if ((stat == CM_RES_ISREG_REG) || (stat == CM_RES_ISREG_NOT_SUPPORT)) {
         return true;
     }
-    write_runlog(LOG, "cur inst(%u) isreg stat=(%u), can't do start.\n", conf->cmInstanceId, (uint32)stat);
+    write_runlog(LOG, "cur inst(%u) isreg stat=(%u), can't do restart.\n", conf->cmInstanceId, (uint32)stat);
     return false;
 }
 
-static inline void RestartOneResInst(CmResConfList *conf)
+static inline status_t RestartOneResInst(CmResConfList *conf)
 {
-    write_runlog(LOG, "res(%s) inst(%u) need restart.\n", conf->resName, conf->cmInstanceId);
     (void)CleanOneResInst(conf);
-    if (CanCusInstDoStart(conf)) {
-        StartOneResInst(conf);
-    }
+    CM_RETURN_IFERR(StartOneResInst(conf));
+    return CM_SUCCESS;
 }
 
 static void ProcessOfflineInstance(CmResConfList *conf)
 {
     if (conf->checkInfo.restartTimes == -1) {
-        RestartOneResInst(conf);
+        if (CanCusInstDoRestart(conf)) {
+            (void)RestartOneResInst(conf);
+        }
         return;
     }
     if (conf->checkInfo.brokeTime == 0) {
@@ -261,7 +283,9 @@ static void ProcessOfflineInstance(CmResConfList *conf)
         return;
     }
     if (conf->checkInfo.startCount >= conf->checkInfo.restartTimes) {
-        write_runlog(LOG, "[CLIENT] res(%s) inst(%u) get out from cluster.\n", conf->resName, conf->resInstanceId);
+        write_runlog(LOG, "res(%s) inst(%u) is offline, but restart times (%d) >= limit (%d), can't do restart again, "
+            "will do manually stop.\n", conf->resName, conf->resInstanceId, conf->checkInfo.startCount,
+            conf->checkInfo.restartTimes);
         ManualStopLocalResInst(conf);
         return;
     }
@@ -275,18 +299,14 @@ static void ProcessOfflineInstance(CmResConfList *conf)
             conf->resName, conf->resInstanceId, conf->checkInfo.startTime, conf->checkInfo.restartPeriod);
         return;
     }
-    RestartOneResInst(conf);
+    if (!CanCusInstDoRestart(conf)) {
+        return;
+    }
+    CM_RETVOID_IFERR(RestartOneResInst(conf));
     conf->checkInfo.startCount++;
     conf->checkInfo.startTime = time(NULL);
-    write_runlog(DEBUG1, "[CLIENT] res(%s) inst(%u) startCount=%d, startTime=%ld.\n",
-        conf->resName, conf->resInstanceId, conf->checkInfo.startCount, conf->checkInfo.startTime);
-}
-
-static inline void CleanOneInstCheckCount(CmResConfList *resConf)
-{
-    resConf->checkInfo.startCount = 0;
-    resConf->checkInfo.startTime = 0;
-    resConf->checkInfo.brokeTime = 0;
+    write_runlog(LOG, "res(%s) inst(%u) has been restart (%d) times, restart more than (%d) time will manually stop.\n",
+        conf->resName, conf->cmInstanceId, conf->checkInfo.startCount, conf->checkInfo.restartTimes);
 }
 
 static inline bool NeedStopResInst(const char *resName, uint32 cmInstId)
@@ -353,7 +373,7 @@ void StopResourceCheck()
             OneResInstShutdown(&g_resConf[i]);
         }
         if (CmFileExist(g_cmManualStartPath) || !IsOneResInstWork(g_resConf[i].resName, g_resConf[i].cmInstanceId)) {
-            (void)CleanOneResInst(&g_resConf[i]);
+            OneResInstClean(&g_resConf[i]);
         }
     }
 }
diff --git a/src/cm_agent/cma_process_messages_client.cpp b/src/cm_agent/cma_process_messages_client.cpp
index 3631231..914c380 100644
--- a/src/cm_agent/cma_process_messages_client.cpp
+++ b/src/cm_agent/cma_process_messages_client.cpp
@@ -368,7 +368,7 @@ static void ProcessRegResInst(const CmsNotifyAgentRegMsg *recvMsg)
         write_runlog(LOG, "local res inst[%s:%u] has been reg.\n", recvMsg->resName, recvMsg->resInstId);
     } else if ((isreg == CM_RES_ISREG_UNREG) || (isreg == CM_RES_ISREG_PENDING) || (isreg == CM_RES_ISREG_UNKNOWN)) {
         write_runlog(LOG, "before reg res inst, need clean res inst first.\n");
-        if (CleanOneResInst(local) == CM_SUCCESS) {
+        if ((CheckOneResInst(local) == CUS_RES_CHECK_STAT_OFFLINE) || (CleanOneResInst(local) == CM_SUCCESS)) {
             (void)RegOneResInst(local, recvMsg->resInstId);
         }
     } else if (isreg == CM_RES_ISREG_NOT_SUPPORT) {
diff --git a/src/cm_client/cm_client.cpp b/src/cm_client/cm_client.cpp
index 06036cb..e37f1b5 100644
--- a/src/cm_client/cm_client.cpp
+++ b/src/cm_client/cm_client.cpp
@@ -242,7 +242,7 @@ void *ConnectAgentMain(void *arg)
             ConnectCreate(g_agentConnect);
             if (g_agentConnect->isClosed) {
                 write_runlog(ERROR, "cm_client connect to cm_agent failed, retry.\n");
-                CmUsleep(CLIENT_CHECK_CONN_INTERVAL);
+                (void)usleep(CLIENT_CHECK_CONN_INTERVAL);
                 continue;
             }
             g_needReconnect = false;
@@ -273,7 +273,7 @@ void *ConnectAgentMain(void *arg)
                 continue;
             }
         }
-        CmUsleep(CLIENT_CHECK_CONN_INTERVAL);
+        (void)usleep(CLIENT_CHECK_CONN_INTERVAL);
     }
 
     return NULL;
@@ -325,7 +325,7 @@ void SendOneMsgToAgent()
     if (CmClientSendMsg(msgPkg.msgPtr, msgPkg.msgLen) != CM_SUCCESS) {
         write_runlog(ERROR, "client send msg to agent failed!\n");
         g_needReconnect = true;
-        CmUsleep(CLIENT_CHECK_CONN_INTERVAL);
+        (void)usleep(CLIENT_CHECK_CONN_INTERVAL);
     }
     free(msgPkg.msgPtr);
 }
@@ -341,7 +341,7 @@ void *SendMsgToAgentMain(void *arg)
             break;
         }
         if (g_agentConnect->isClosed) {
-            CmUsleep(CLIENT_SEND_CHECK_INTERVAL);
+            (void)usleep(CLIENT_SEND_CHECK_INTERVAL);
             continue;
         }
 
@@ -489,12 +489,12 @@ void *RecvMsgFromAgentMain(void *arg)
             break;
         }
         if (g_agentConnect->isClosed) {
-            CmUsleep(CLIENT_CHECK_CONN_INTERVAL);
+            (void)usleep(CLIENT_CHECK_CONN_INTERVAL);
             continue;
         }
         if (RecvMsgFromAgent() != CM_SUCCESS) {
             g_needReconnect = true;
-            CmUsleep(CLIENT_CHECK_CONN_INTERVAL);
+            (void)usleep(CLIENT_CHECK_CONN_INTERVAL);
         }
     }
 
diff --git a/src/cm_common/cm_elog.cpp b/src/cm_common/cm_elog.cpp
index 0a6243f..d82a119 100644
--- a/src/cm_common/cm_elog.cpp
+++ b/src/cm_common/cm_elog.cpp
@@ -1952,6 +1952,7 @@ void CmKeyEventInit(void)
     g_cmKeyEventType[KEY_EVENT_RECOVER]                     = "KEY_EVENT_RECOVER";
     g_cmKeyEventType[KEY_EVENT_REFRESH_OBS_DELETE_TEXT]     = "KEY_EVENT_REFRESH_OBS_DELETE_TEXT";
     g_cmKeyEventType[KEY_EVENT_DROP_CN_OBS_XLOG]            = "KEY_EVENT_DROP_CN_OBS_XLOG";
+    g_cmKeyEventType[KEY_EVENT_RES_ARBITRATE]               = "KEY_EVENT_RES_ARBITRATE";
 }
 
 void CreateKeyEventLogFile(const char *sysLogPath)
diff --git a/src/cm_common/cm_util.cpp b/src/cm_common/cm_util.cpp
index 95cb2b0..a4b800a 100644
--- a/src/cm_common/cm_util.cpp
+++ b/src/cm_common/cm_util.cpp
@@ -89,69 +89,65 @@ char *gs_getenv_r(const char *name)
 
 uint64 GetMonotonicTimeMs()
 {
-    static const uint32 CM_NSEC_COUNT_PER_MS = 1000000;
-    static const uint32 CM_MS_COUNT_PER_SEC = 1000;
-
     struct timespec ts;
     (void)clock_gettime(CLOCK_MONOTONIC, &ts);
     return (uint64)ts.tv_sec * CM_MS_COUNT_PER_SEC + (uint64)ts.tv_nsec / CM_NSEC_COUNT_PER_MS;
 }
 
-void CMPrioMutexInit(CMPrioMutex &mutex)
+void CMFairMutexInit(CMFairMutex &mutex)
 {
     (void)pthread_mutex_init(&mutex.lock, NULL);
     (void)pthread_mutex_init(&mutex.innerLock, NULL);
     (void)pthread_cond_init(&mutex.cond, NULL);
-    mutex.highPrioCount = 0;
-    mutex.curPrio = CMMutexPrio::CM_MUTEX_PRIO_NONE;
+    mutex.readerCount = 0;
+    mutex.writerCount = 0;
+    mutex.curType = CMFairMutexType::CM_MUTEX_NODE;
 }
-
-int CMPrioMutexLock(CMPrioMutex &mutex, CMMutexPrio prio)
+ 
+int CMFairMutexLock(CMFairMutex &mutex, CMFairMutexType type)
 {
-    if (prio == CMMutexPrio::CM_MUTEX_PRIO_HIGH) {
-        (void)pthread_mutex_lock(&mutex.innerLock);
-        mutex.highPrioCount++;
-        (void)pthread_mutex_unlock(&mutex.innerLock);
-        int ret = pthread_mutex_lock(&mutex.lock);
-        if (ret == 0) {
-            mutex.curPrio = CMMutexPrio::CM_MUTEX_PRIO_HIGH;
-        } else {
-            (void)pthread_mutex_lock(&mutex.innerLock);
-            mutex.highPrioCount--;
-            (void)pthread_mutex_unlock(&mutex.innerLock);
-            (void)pthread_cond_broadcast(&mutex.cond);
-        }
-
-        return ret;
+    struct timespec ts;
+    uint32* count1 = NULL;
+    uint32* count2 = NULL;
+    const int LOCK_WAIT_TIME = 2;
+  
+    if (type == CMFairMutexType::CM_MUTEX_READ) {
+        count1 = &mutex.readerCount;
+        count2 = &mutex.writerCount;
+    } else {
+        count1 = &mutex.writerCount;
+        count2 = &mutex.readerCount;
     }
-
+ 
+    (void)pthread_mutex_lock(&mutex.innerLock);
+    (*count1)++;
+ 
     while (true) {
-        if (mutex.highPrioCount == 0) {
+        if (type != mutex.curType || *count2 == 0) {
             int ret = pthread_mutex_trylock(&mutex.lock);
             if (ret == 0) {
-                mutex.curPrio = CMMutexPrio::CM_MUTEX_PRIO_NORMAL;
-                return 0;
-            } else if (ret != EBUSY) {
-                return ret;
+                mutex.curType = type;
+                (*count1)--;
+                break;
             }
         }
-
-        (void)pthread_mutex_lock(&mutex.innerLock);
-        (void)pthread_cond_wait(&mutex.cond, &mutex.innerLock);
-        (void)pthread_mutex_unlock(&mutex.innerLock);
+ 
+        (void)clock_gettime(CLOCK_REALTIME, &ts);
+        ts.tv_sec += LOCK_WAIT_TIME;
+ 
+        (void)pthread_cond_timedwait(&mutex.cond, &mutex.innerLock, &ts);
     }
+ 
+    (void)pthread_mutex_unlock(&mutex.innerLock);
+ 
+    return 0;
 }
-
-void CMPrioMutexUnLock(CMPrioMutex &mutex)
+ 
+void CMFairMutexUnLock(CMFairMutex &mutex)
 {
-    if (mutex.curPrio == CMMutexPrio::CM_MUTEX_PRIO_HIGH) {
-        (void)pthread_mutex_lock(&mutex.innerLock);
-        mutex.highPrioCount--;
-        (void)pthread_mutex_unlock(&mutex.innerLock);
-    }
-
-    mutex.curPrio = CMMutexPrio::CM_MUTEX_PRIO_NONE;
+    (void)pthread_mutex_lock(&mutex.innerLock);
     (void)pthread_mutex_unlock(&mutex.lock);
+    (void)pthread_mutex_unlock(&mutex.innerLock);
     (void)pthread_cond_broadcast(&mutex.cond);
 }
 
diff --git a/src/cm_ctl/ctl_show.cpp b/src/cm_ctl/ctl_show.cpp
index 96c9108..7e389c1 100644
--- a/src/cm_ctl/ctl_show.cpp
+++ b/src/cm_ctl/ctl_show.cpp
@@ -82,6 +82,7 @@ void HandleRhbAck(CmRhbStatAck *ack)
 
     (void)printf("Network stat('Y' means connected, otherwise 'N'):\n");
     char *rs = GetRhbSimple((time_t *)ack->hbs, MAX_RHB_NUM, ack->hwl, ack->baseTime, ack->timeout);
+    CM_RETURN_IF_NULL(rs);
     (void)printf("%s\n", rs);
     free(rs);
 }
diff --git a/src/cm_ctl/ctl_switchover.cpp b/src/cm_ctl/ctl_switchover.cpp
index f46e571..f223747 100644
--- a/src/cm_ctl/ctl_switchover.cpp
+++ b/src/cm_ctl/ctl_switchover.cpp
@@ -460,7 +460,6 @@ static int BalanceResultReq(int &timePass, bool waitBalance, int &sendCheckCount
         write_runlog(ERROR,
             "switchover command timeout!\n\n"
             "HINT: Maybe the switchover action is continually running in the background.\n"
-            "You can wait for a while and check the status of current cluster using "
             "\"cm_ctl query -Cv\".\n");
         CMPQfinish(CmServer_conn);
         CmServer_conn = NULL;
diff --git a/src/cm_persist/cm_persist.cpp b/src/cm_persist/cm_persist.cpp
index 0eab90c..a1e20bf 100644
--- a/src/cm_persist/cm_persist.cpp
+++ b/src/cm_persist/cm_persist.cpp
@@ -20,29 +20,59 @@
  *
  * -------------------------------------------------------------------------
  */
-#include "share_disk_lock_api.h"
-
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include "share_disk_lock_api.h"
 
-
-static const int ARGS_NUM = 4;
+static const int ARGS_FIVE_NUM = 5;
+static const int ARGS_SIX_NUM = 6;
+static const int CMDLOCKTIME_NO = 5;
+static const int CMDTYPE_NO = 4;
 static const int OFFSET_NO = 3;
 static const int INSTANCEID_NO = 2;
 static const int DEVICE_NO = 1;
 static const int DECIMAL_BASE = 10;
 
+
+int ExeLockCmd(diskLrwHandler *handler)
+{
+    status_t ret = CmDiskLockS(&handler->headerLock, handler->scsiDev, handler->fd);
+    if (ret == CM_SUCCESS) {
+        return 0;
+    }
+    time_t lockTime = LOCKR_LOCK_TIME(handler->headerLock);
+    if (lockTime <= 0) {
+        return -1;
+    }
+
+    // system function execute lock cmd result range is [0, 127], 127 and 126 maybe system command failed result
+    // so get lock time valid range is [1, 125]
+    // 0:get lock success;-1:get lock failed and get lock time failed;[1,125]:get lock failed but get lock time success
+    return (int)lockTime;
+}
+int ExeForceLockCmd(diskLrwHandler *handler, int64 lockTime)
+{
+    return (int)CmDiskLockf(&handler->headerLock, handler->fd, lockTime);
+}
+
+typedef enum en_persist_cmd_type {
+    CMD_LOCK = 0,
+    CMD_FORCE_LOCK = 1,
+} PERSIST_CMD_TYPE;
+
 static void usage()
 {
     (void)printf(_("cm_persist: get disk lock for the shared storage.\n\n"));
     (void)printf(_("Usage:\n"));
-    (void)printf(_("  cm_persist [DEVICEPATH] [INSTANCE_ID] [OFFSET]\n"));
+    (void)printf(_("  cm_persist [DEVICEPATH] [INSTANCE_ID] [OFFSET] [CMD_TYPE] [LOCK_TIME]\n"));
     (void)printf(_("[DEVICEPATH]: the path of the shared storage\n"));
     (void)printf(_("[INSTANCE_ID]: the instanceid of the process\n"));
     (void)printf(_("[OFFSET]: get disk lock on storage position\n"));
+    (void)printf(_("[CMD_TYPE]: cm_persist command type\n"));
+    (void)printf(_("[LOCK_TIME]: lock time only used when CMD_TYPE is 1\n"));
     (void)printf(_("-?, --help            show this help, then exit\n"));
 }
 
@@ -60,6 +90,33 @@ static status_t GetIntValue(char *input, int64 *value)
     return CM_SUCCESS;
 }
 
+static int ExePersistCmd(diskLrwHandler *cmsArbitrateDiskHandler, int64 cmdType, int argc, char **argv)
+{
+    int ret = -1;
+    switch (cmdType) {
+        case CMD_LOCK:
+            if (argc != ARGS_FIVE_NUM) {
+                break;
+            }
+            ret = ExeLockCmd(cmsArbitrateDiskHandler);
+            break;
+        case CMD_FORCE_LOCK:
+            if (argc != ARGS_SIX_NUM) {
+                break;
+            }
+            int64 lockTime;
+            if (GetIntValue(argv[CMDLOCKTIME_NO], &lockTime) != CM_SUCCESS) {
+                break;
+            }
+            ret = ExeForceLockCmd(cmsArbitrateDiskHandler, lockTime);
+            break;
+        default:
+            break;
+    }
+
+    return ret;
+}
+
 int main(int argc, char **argv)
 {
     if (argc > 1) {
@@ -69,35 +126,39 @@ int main(int argc, char **argv)
         }
     }
 
-    if (argc != ARGS_NUM) {
+    if (argc < ARGS_FIVE_NUM) {
         (void)printf(_("the num(%d) of parameters input is invalid.\n\n"), argc);
         usage();
-        return 1;
+        return -1;
     }
 
     int64 instanceId;
     int64 offset;
+    int64 cmdType;
     if (GetIntValue(argv[INSTANCEID_NO], &instanceId) != CM_SUCCESS) {
-        return 1;
+        return -1;
     }
     if (GetIntValue(argv[OFFSET_NO], &offset) != CM_SUCCESS) {
-        return 1;
+        return -1;
+    }
+    if (GetIntValue(argv[CMDTYPE_NO], &cmdType) != CM_SUCCESS) {
+        return -1;
     }
 
     diskLrwHandler cmsArbitrateDiskHandler;
     if (InitDiskLockHandle(&cmsArbitrateDiskHandler, argv[DEVICE_NO], (uint32)offset, instanceId) != CM_SUCCESS) {
-        return 1;
+        return -1;
     }
 
-    status_t ret = ShareDiskGetDlock(&cmsArbitrateDiskHandler);
+    int ret = ExePersistCmd(&cmsArbitrateDiskHandler, cmdType, argc, argv);
     (void)close(cmsArbitrateDiskHandler.fd);
     FREE_AND_RESET(cmsArbitrateDiskHandler.headerLock.buff);
-    if (ret != CM_SUCCESS) {
+    if (ret != (int)CM_SUCCESS) {
         (void)printf(_("Failed to get disk lock.\n\n"));
-        return 1;
+        return ret;
     }
-    
+
     (void)printf(_("Success to get disk lock.\n\n"));
-    return 0;
+    return ret;
 }
 
diff --git a/src/cm_persist/share_disk_lock.cpp b/src/cm_persist/share_disk_lock.cpp
index fad86c3..2235557 100644
--- a/src/cm_persist/share_disk_lock.cpp
+++ b/src/cm_persist/share_disk_lock.cpp
@@ -29,6 +29,16 @@
 
 const int BLOCK_NUMS = 3;
 const uint32 LOCK_BLOCK_NUMS = 2;
+const time_t MAX_VALID_LOCK_TIME = 125;
+const time_t BASE_VALID_LOCK_TIME = 1;
+
+time_t CalcLockTime(time_t lockTime)
+{
+    // system function execute lock cmd result range is [0, 127], 127 and 126 maybe system command failed result
+    // so get lock time valid range is [1, 125]
+    // 0:get lock success;-1:get lock failed and get lock time failed;[1,125]:get lock failed but get lock time success
+    return lockTime % MAX_VALID_LOCK_TIME + BASE_VALID_LOCK_TIME;
+}
 
 status_t CmAllocDlock(dlock_t *lock, uint64 lockAddr, int64 instId)
 {
@@ -141,28 +151,6 @@ status_t CmDiskLockS(dlock_t *lock, const char *scsiDev, int32 fd)
     return CM_SUCCESS;
 }
 
-status_t CmDiskLockfS(dlock_t *lock, const char *scsiDev)
-{
-    if (lock == NULL|| scsiDev == NULL) {
-        return CM_ERROR;
-    }
-
-    int32 fd = open(scsiDev, O_RDWR | O_DIRECT | O_SYNC);
-    if (fd < 0) {
-        (void)printf(_("CmDiskLockfS Open dev %s failed, errno %d.\n"), scsiDev, errno);
-        return CM_ERROR;
-    }
-
-    status_t ret = CmDiskLockf(lock, fd);
-    if (ret != CM_SUCCESS) {
-        (void)close(fd);
-        return ret;
-    }
-
-    (void)close(fd);
-    return CM_SUCCESS;
-}
-
 int32 CmDiskLock(dlock_t *lock, int32 fd)
 {
     uint32 buffLen = LOCK_BLOCK_NUMS * CM_DEF_BLOCK_SIZE;
@@ -172,7 +160,7 @@ int32 CmDiskLock(dlock_t *lock, int32 fd)
     }
 
     time_t t = time(NULL);
-    LOCKW_LOCK_TIME(*lock) = t;
+    LOCKW_LOCK_TIME(*lock) = CalcLockTime(t);
     LOCKW_LOCK_CREATE_TIME(*lock) = t;
     int32 ret = CmScsi3Caw(fd, lock->lockAddr / CM_DEF_BLOCK_SIZE, lock->lockr, buffLen);
     if (ret != (int)CM_SUCCESS) {
@@ -223,7 +211,7 @@ int32 CmDiskLock(dlock_t *lock, int32 fd)
     return 0;
 }
 
-status_t CmDiskLockf(dlock_t *lock, int32 fd)
+status_t CmDiskLockf(dlock_t *lock, int32 fd, int64 lockTime)
 {
     if (lock == NULL || fd < 0) {
         return CM_ERROR;
@@ -233,6 +221,7 @@ status_t CmDiskLockf(dlock_t *lock, int32 fd)
         (void)printf(_("Get lock info from dev failed, fd %d.\n"), fd);
         return CM_ERROR;
     }
+    LOCKR_LOCK_TIME(*lock) = lockTime;
     int32 ret = CmDiskLock(lock, fd);
     if (ret != (int)CM_SUCCESS) {
         return CM_ERROR;
@@ -256,3 +245,4 @@ status_t CmGetDlockInfo(dlock_t *lock, int32 fd)
     }
     return CM_SUCCESS;
 }
+
diff --git a/src/cm_persist/share_disk_lock_api.cpp b/src/cm_persist/share_disk_lock_api.cpp
index 16d443b..3a04158 100644
--- a/src/cm_persist/share_disk_lock_api.cpp
+++ b/src/cm_persist/share_disk_lock_api.cpp
@@ -30,10 +30,6 @@
 #include "securec.h"
 #include "share_disk_lock_api.h"
 
-const int LOCK_WAIT_INTERVAL = 10 * 1000;
-const int FORCE_LOCK_TRY_TIMES = 3;
-const int LOCK_WAIT_MAX_TIMTS = 500;
-
 status_t ShareDiskHandlerInit(diskLrwHandler *handler)
 {
     if (CmAllocDlock(&handler->headerLock, handler->offset, handler->instId) != CM_SUCCESS) {
@@ -65,46 +61,3 @@ status_t InitDiskLockHandle(diskLrwHandler *sdLrwHandler, const char *scsi_dev,
     return CM_SUCCESS;
 }
 
-status_t ShareDiskGetDlock(diskLrwHandler *handler)
-{
-    status_t ret = CM_SUCCESS;
-    int32 times = 0;
-    int32 delayTimes = 0;
-    bool hasRefreshLockTime = false;
-
-    time_t lockTime = 0;
-    do {
-        ret = CmDiskLockS(&handler->headerLock, handler->scsiDev, handler->fd);
-        if (ret == CM_SUCCESS) {
-            return CM_SUCCESS;
-        }
-        if (lockTime != LOCKR_LOCK_TIME(handler->headerLock)) {
-            lockTime = LOCKR_LOCK_TIME(handler->headerLock);
-            delayTimes = 0;
-            if (hasRefreshLockTime) {
-                (void)printf(_("Get lock failed for lock time has been refreshed by other process\n"));
-                return CM_ERROR;
-            }
-            hasRefreshLockTime = true;
-        }
-
-        if (lockTime == LOCKR_LOCK_TIME(handler->headerLock)) {
-            if (delayTimes < LOCK_WAIT_MAX_TIMTS) {
-                (void)usleep(LOCK_WAIT_INTERVAL);
-                delayTimes++;
-                continue;
-            }
-
-            ret = CmDiskLockfS(&handler->headerLock, handler->scsiDev);
-            if (ret != CM_SUCCESS) {
-                (void)printf(_("Get lock failed when force %d times\n"), ++times);
-                return CM_ERROR;
-            }
-            (void)printf(_("Get lock success when force %d times.\n"), ++times);
-            return CM_SUCCESS;
-        }
-
-        (void)usleep(LOCK_WAIT_INTERVAL);
-    } while (1);
-}
-
diff --git a/src/cm_server/cms_arbitrate_cluster.cpp b/src/cm_server/cms_arbitrate_cluster.cpp
index 950ec05..72bec1b 100644
--- a/src/cm_server/cms_arbitrate_cluster.cpp
+++ b/src/cm_server/cms_arbitrate_cluster.cpp
@@ -265,14 +265,6 @@ static void ReleaseMaxNodeMemory()
     FreeDmsValue();
 }
 
-static inline char *GetDynamicMem(char *dynamicPtr, size_t *curSize, size_t memSize)
-{
-    size_t tmpCurSize = (*curSize);
-    char *tmp = dynamicPtr + tmpCurSize;
-    (*curSize) = tmpCurSize + memSize;
-    return tmp;
-}
-
 static status_t AllocNodeClusterMemory(NodeCluster *nodeCluster, int32 maxNodeNum)
 {
     size_t memSize = sizeof(uint32) * (uint32)(maxNodeNum);
@@ -337,9 +329,9 @@ static bool CheckPoint2PointConn(int32 resIdx1, int32 resIdx2)
     return (connRes1 && connRes2);
 }
 
-static MaxClusterResStatus GetDiskHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout)
+static MaxClusterResStatus GetDiskHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout, int logLevel)
 {
-    VotingDiskStatus stat = GetNodeHeartbeatStat(nodeIndex, diskTimeout);
+    VotingDiskStatus stat = GetNodeHeartbeatStat(nodeIndex, diskTimeout, logLevel);
     if (stat == VOTING_DISK_STATUS_UNAVAIL) {
         return MAX_CLUSTER_STATUS_UNAVAIL;
     } else if (stat == VOTING_DISK_STATUS_AVAIL) {
@@ -351,9 +343,9 @@ static MaxClusterResStatus GetDiskHeartbeatStat(uint32 nodeIndex, uint32 diskTim
 static bool IsAllResAvailInNode(int32 resIdx)
 {
     uint32 nodeIdx = g_clusterRes.map[resIdx].nodeIdx;
-    MaxClusterResStatus heartbeatStatus = GetDiskHeartbeatStat(nodeIdx, g_diskTimeout);
+    MaxClusterResStatus heartbeatStatus = GetDiskHeartbeatStat(nodeIdx, g_diskTimeout, DEBUG5);
     bool heartbeatRes = IsCurResAvail(resIdx, MAX_CLUSTER_TYPE_VOTE_DISK, heartbeatStatus);
-    MaxClusterResStatus nodeStatus = GetResNodeStat(g_node[nodeIdx].node);
+    MaxClusterResStatus nodeStatus = GetResNodeStat(g_node[nodeIdx].node, DEBUG5);
     bool nodeRes = IsCurResAvail(resIdx, MAX_CLUSTER_TYPE_RES_STATUS, nodeStatus);
     return (heartbeatRes && nodeRes);
 }
@@ -429,16 +421,10 @@ static int32 FindNodeCluster(int32 startPoint, int32 maxNum, NodeCluster *nodeCl
             continue;
         }
         if (!CheckPoint2PointConn(startPoint, i)) {
-            write_runlog(LOG, "(index=%d,nodeId=%u) disconnect with (index=%d,nodeId=%u).\n",
-                startPoint, GetNodeByPoint(startPoint), i, GetNodeByPoint(i));
-            PrintHbsInfo(startPoint, GetNodeByPoint(startPoint), i, GetNodeByPoint(i), LOG);
             continue;
         }
         for (j = 0; j < maxNum; ++j) {
             if (!CheckPoint2PointConn(i, nodeCluster->visNode[j])) {
-                write_runlog(LOG, "(index=%d,nodeId=%u) disconnect with (index=%d,nodeId=%u).\n",
-                    startPoint, GetNodeByPoint(startPoint), i, GetNodeByPoint(i));
-                PrintHbsInfo(startPoint, GetNodeByPoint(startPoint), i, GetNodeByPoint(i), LOG);
                 break;
             }
         }
@@ -492,7 +478,7 @@ static void PrintMaxNodeCluster(const MaxNodeCluster *maxNodeCluster, const char
     for (int32 i = 0; i < maxNodeCluster->nodeCluster.clusterNum; ++i) {
         StrcatNextNodeStr(clusterStr, MAX_PATH_LEN, maxNodeCluster->nodeCluster.cluster[i]);
     }
-    write_runlog(LOG, "%s the max node cluster: %s.\n", str, clusterStr);
+    write_runlog(logLevel, "%s the max node cluster: %s.\n", str, clusterStr);
 }
 
 static void GetClusterKeyInDdb(char *key, uint32 keyLen)
@@ -835,7 +821,7 @@ static void CopyCur2LastMaxNodeCluster(MaxNodeCluster *lastCluster, MaxNodeClust
     lastCluster->version = curCluster->version;
     SetCurMaxNodeByLast(curCluster, lastCluster);
     (void)pthread_rwlock_unlock(&(lastCluster->lock));
-    PrintMaxNodeCluster(lastCluster, "[CompareCurLastMaxNodeCluster]", FATAL);
+    PrintMaxNodeCluster(lastCluster, "[CompareCurLastMaxNodeCluster]", DEBUG1);
 }
 
 static void AddCurResInCurCluster(int32 resIdx, NodeCluster *curCluster)
@@ -889,6 +875,85 @@ static bool8 CanArbitrateMaxCluster(const NodeCluster *lastCluster, NodeCluster
     return (bool8)(curCluster->clusterNum > lastCluster->clusterNum);
 }
 
+static bool IsNodeInCluster(int32 resIdx, const MaxNodeCluster *nodeCluster)
+{
+    for (int32 i = 0; i < nodeCluster->nodeCluster.clusterNum; ++i) {
+        if (resIdx == nodeCluster->nodeCluster.cluster[i]) {
+            return true;
+        }
+    }
+    return false;
+}
+
+static void PrintRhbStatus()
+{
+    uint32 hwl = 0;
+    time_t hbs[MAX_RHB_NUM][MAX_RHB_NUM] = {{0}};
+    GetRhbStat(hbs, &hwl);
+    char *rhbStr = GetRhbSimple((time_t *)hbs, MAX_RHB_NUM, hwl, time(NULL), g_agentNetworkTimeout);
+    CM_RETURN_IF_NULL(rhbStr);
+    size_t rhbLen = strlen(rhbStr);
+    if (rhbLen >= MAX_LOG_BUFF_LEN) {
+        write_runlog(LOG, "rhbStr len(%lu) is exceed max log buff len(%d), can't print network stat.\n",
+            rhbLen, MAX_LOG_BUFF_LEN);
+        FREE_AND_RESET(rhbStr);
+        return;
+    }
+    write_runlog(LOG, "Network timeout:%u\n", g_agentNetworkTimeout);
+    write_runlog(LOG, "Network stat('Y' means connected, otherwise 'N'):\n%s\n", rhbStr);
+    FREE_AND_RESET(rhbStr);
+}
+
+static void PrintKickOutResult(int32 resIdx, const MaxNodeCluster *maxCluster)
+{
+    uint32 nodeIdx = g_clusterRes.map[resIdx].nodeIdx;
+
+    MaxClusterResStatus heartbeatStatus = GetDiskHeartbeatStat(nodeIdx, g_diskTimeout, LOG);
+    if (!IsCurResAvail(resIdx, MAX_CLUSTER_TYPE_VOTE_DISK, heartbeatStatus)) {
+        write_runlog(LOG, "kick out result: node(%u) disk heartbeat timeout.\n", g_node[nodeIdx].node);
+        return;
+    }
+
+    MaxClusterResStatus nodeStatus = GetResNodeStat(g_node[nodeIdx].node, LOG);
+    if (!IsCurResAvail(resIdx, MAX_CLUSTER_TYPE_RES_STATUS, nodeStatus)) {
+        write_runlog(LOG, "kick out result: node(%u) res inst manual stop or report timeout.\n", g_node[nodeIdx].node);
+        return;
+    }
+
+    for (int32 i = 0; i < maxCluster->nodeCluster.clusterNum; ++i) {
+        if (resIdx == maxCluster->nodeCluster.cluster[i]) {
+            continue;
+        }
+        if (!CheckPoint2PointConn(resIdx, maxCluster->nodeCluster.cluster[i])) {
+            write_runlog(LOG, "kick out result: (index=%d,nodeId=%u) disconnect with (index=%d,nodeId=%u).\n",
+                resIdx, GetNodeByPoint(resIdx), i, GetNodeByPoint(i));
+            PrintHbsInfo(resIdx, GetNodeByPoint(resIdx), i, GetNodeByPoint(i), LOG);
+            continue;
+        }
+    }
+    PrintRhbStatus();
+}
+
+static void PrintArbitrateResult(const MaxNodeCluster *lastCluster, const MaxNodeCluster *curCluster)
+{
+    // kick out
+    for (int32 i = 0; i < lastCluster->nodeCluster.clusterNum; ++i) {
+        if (!IsNodeInCluster(lastCluster->nodeCluster.cluster[i], curCluster)) {
+            uint32 nodeIdx = g_clusterRes.map[lastCluster->nodeCluster.cluster[i]].nodeIdx;
+            WriteKeyEventLog(KEY_EVENT_RES_ARBITRATE, 0, "node(%u) kick out.", g_node[nodeIdx].node);
+            PrintKickOutResult(lastCluster->nodeCluster.cluster[i], lastCluster);
+        }
+    }
+
+    // join in
+    for (int32 i = 0; i < curCluster->nodeCluster.clusterNum; ++i) {
+        if (!IsNodeInCluster(curCluster->nodeCluster.cluster[i], lastCluster)) {
+            uint32 nodeIdx = g_clusterRes.map[curCluster->nodeCluster.cluster[i]].nodeIdx;
+            WriteKeyEventLog(KEY_EVENT_RES_ARBITRATE, 0, "node(%u) join in cluster.", g_node[nodeIdx].node);
+        }
+    }
+}
+
 static void CompareCurLastMaxNodeCluster(MaxNodeCluster *lastCluster, MaxNodeCluster *curCluster)
 {
     if (curCluster->nodeCluster.clusterNum <= 0) {
@@ -905,6 +970,7 @@ static void CompareCurLastMaxNodeCluster(MaxNodeCluster *lastCluster, MaxNodeClu
     }
     write_runlog(LOG, "last(%lu) is different from current(%lu), result is %d.\n",
         lastCluster->version, curCluster->version, result);
+    PrintArbitrateResult(lastCluster, curCluster);
     // wait for successfully setting cluster to ddb.
     status_t st = SetCurClusterToDdb(curCluster);
     if (st != CM_SUCCESS) {
diff --git a/src/cm_server/cms_arbitrate_cms.cpp b/src/cm_server/cms_arbitrate_cms.cpp
index 253d5d9..f9c4900 100644
--- a/src/cm_server/cms_arbitrate_cms.cpp
+++ b/src/cm_server/cms_arbitrate_cms.cpp
@@ -127,20 +127,6 @@ static void coordinator_notify_msg_reset(void)
     }
 }
 
-static void IncrementTermIfCmRestart()
-{
-    if (!IsNeedSyncDdb()) {
-        return;
-    }
-    (void)pthread_rwlock_wrlock(&term_update_rwlock);
-    int incrementTermSesult = IncrementTermToDdb();
-    (void)pthread_rwlock_unlock(&term_update_rwlock);
-    if (incrementTermSesult != 0) {
-        write_runlog(ERROR, "Incrtement term to ddb failed, %d:node(%u) cm_server role is %s, will to primary.\n",
-            __LINE__, g_currentNode->node, server_role_to_string(g_HA_status->local_role));
-    }
-}
-
 static void clean_cn_heart_beat(int cmServerCurrentRole, int cm_server_last_role)
 {
     if ((cmServerCurrentRole != CM_SERVER_PRIMARY) && (cm_server_last_role == CM_SERVER_PRIMARY)) {
@@ -159,26 +145,6 @@ static void clean_cn_heart_beat(int cmServerCurrentRole, int cm_server_last_role
     }
 }
 
-static void CmsSyncStandbyMode()
-{
-    char key[MAX_PATH_LEN] = {0};
-    char value[MAX_PATH_LEN] = {0};
-    errno_t rc =
-        snprintf_s(key, MAX_PATH_LEN, MAX_PATH_LEN - 1, "/%s/CMServer/status_key/sync_standby_mode", pw->pw_name);
-    securec_check_intval(rc, (void)rc);
-
-    DDB_RESULT ddbResult = SUCCESS_GET_VALUE;
-    status_t st = GetKVFromDDb(key, MAX_PATH_LEN, value, MAX_PATH_LEN, &ddbResult);
-    if (st != CM_SUCCESS) {
-        int logLevel = (ddbResult == CAN_NOT_FIND_THE_KEY) ? ERROR : LOG;
-        write_runlog(logLevel, "failed to get value with key(%s).\n", key);
-        return;
-    }
-    current_cluster_az_status = (synchronous_standby_mode)strtol(value, NULL, 10);
-    write_runlog(LOG, "setting to %d.\n", current_cluster_az_status);
-    return;
-}
-
 static void CleanSwitchoverCommand()
 {
     write_runlog(LOG, "cms change to primary, will clean switchover command.\n");
@@ -257,8 +223,6 @@ static void check_server_role_changed(int cm_server_role)
                 (int)cm_server_start_mode, g_node_num);
         }
 #endif
-        /* get the ddb key-value of the synchronize-standby-mode */
-        CmsSyncStandbyMode();
     }
 }
 
@@ -420,13 +384,21 @@ static void CmsChange2Primary(int32 *cmsDemoteDelayOnConnLess)
     if (g_HA_status->local_role == CM_SERVER_PRIMARY) {
         return;
     }
-    IncrementTermIfCmRestart();
+    if (IsNeedSyncDdb()) {
+        (void)pthread_rwlock_wrlock(&term_update_rwlock);
+        g_needIncTermToDdbAgain = true;
+        (void)pthread_rwlock_unlock(&term_update_rwlock);
+        g_needReloadSyncStandbyMode = true;
+    }
+
     write_runlog(LOG, "node(%u) cms role is %s, change to primary by ddb, and g_ddbRole is %d.\n",
         g_currentNode->node, server_role_to_string(g_HA_status->local_role), (int)g_ddbRole);
     g_HA_status->local_role = CM_SERVER_PRIMARY;
     *cmsDemoteDelayOnConnLess = cmserver_demote_delay_on_conn_less;
     ClearSyncWithDdbFlag();
-    NotifyDdb(DDB_ROLE_LEADER);
+    if (g_dbType != DB_SHAREDISK) {
+        NotifyDdb(DDB_ROLE_LEADER);
+    }
 }
 
 static void PromoteCmsDirect(int32 *cmsDemoteDelayOnConnLess)
diff --git a/src/cm_server/cms_arbitrate_datanode_pms.cpp b/src/cm_server/cms_arbitrate_datanode_pms.cpp
index e1e5faf..7c3d282 100644
--- a/src/cm_server/cms_arbitrate_datanode_pms.cpp
+++ b/src/cm_server/cms_arbitrate_datanode_pms.cpp
@@ -781,6 +781,10 @@ uint32 GetPrimaryTerm(const DnArbCtx *ctx)
 
 static bool DnArbitrateInAsync(DnArbCtx *ctx)
 {
+    if (g_needReloadSyncStandbyMode) {
+        write_runlog(LOG, "line %d: wait to reload sync standby mode ddb value.\n", __LINE__);
+        return true;
+    }
     int azIndex = GetAzIndex(ctx);
     if (azIndex == -1) {
         return true;
diff --git a/src/cm_server/cms_arbitrate_datanode_psd.cpp b/src/cm_server/cms_arbitrate_datanode_psd.cpp
index 1fd30b8..64fb1db 100644
--- a/src/cm_server/cms_arbitrate_datanode_psd.cpp
+++ b/src/cm_server/cms_arbitrate_datanode_psd.cpp
@@ -1072,6 +1072,14 @@ void datanode_instance_arbitrate_for_psd(MsgRecvInfo* recvMsgInfo, const agent_t
         return;
     }
 
+    if (g_needReloadSyncStandbyMode) {
+        write_runlog(LOG,
+            "instance(node=%u instanceid=%u) arbitrate will wait to reload sync standby mode ddb value.\n",
+            node,
+            instanceId);
+        return;
+    }
+
     GetDatanodeDynamicConfigChangeFromDdb(group_index);
     (void)pthread_rwlock_wrlock(&(g_instance_group_report_status_ptr[group_index].lk_lock));
 
diff --git a/src/cm_server/cms_common.cpp b/src/cm_server/cms_common.cpp
index 7552701..815870b 100644
--- a/src/cm_server/cms_common.cpp
+++ b/src/cm_server/cms_common.cpp
@@ -313,6 +313,7 @@ void get_paramter_coordinator_heartbeat_timeout()
 }
 #endif
 
+
 bool CheckBoolConfigParam(const char* value)
 {
     if (strcasecmp(value, "on") == 0 || strcasecmp(value, "yes") == 0 || strcasecmp(value, "true") == 0 ||
@@ -827,6 +828,31 @@ bool SetOfflineNode()
     return false;
 }
 
+void CmsSyncStandbyMode()
+{
+    if (!g_needReloadSyncStandbyMode) {
+        return;
+    }
+    char key[MAX_PATH_LEN] = {0};
+    char value[MAX_PATH_LEN] = {0};
+    errno_t rc =
+        snprintf_s(key, MAX_PATH_LEN, MAX_PATH_LEN - 1, "/%s/CMServer/status_key/sync_standby_mode", pw->pw_name);
+    securec_check_intval(rc, (void)rc);
+
+    DDB_RESULT ddbResult = SUCCESS_GET_VALUE;
+    status_t st = GetKVFromDDb(key, MAX_PATH_LEN, value, MAX_PATH_LEN, &ddbResult);
+    if (st != CM_SUCCESS) {
+        g_needReloadSyncStandbyMode = false;
+        int logLevel = (ddbResult == CAN_NOT_FIND_THE_KEY) ? ERROR : LOG;
+        write_runlog(logLevel, "failed to get value with key(%s).\n", key);
+        return;
+    }
+    current_cluster_az_status = (synchronous_standby_mode)strtol(value, NULL, 10);
+    g_needReloadSyncStandbyMode = false;
+    write_runlog(LOG, "setting current cluster az status to %d.\n", (int)current_cluster_az_status);
+    return;
+}
+
 bool EnableShareDisk()
 {
     return (g_dnArbitrateMode == SHARE_DISK);
diff --git a/src/cm_server/cms_common_res.cpp b/src/cm_server/cms_common_res.cpp
index df126e3..0ce7568 100644
--- a/src/cm_server/cms_common_res.cpp
+++ b/src/cm_server/cms_common_res.cpp
@@ -583,9 +583,11 @@ void NotifyCmaDoReg(uint32 destNodeId)
                 continue;
             }
             ResIsregStatus isreg = GetIsregStatusByCmInstId(resInfo->resStat[j].cmInstanceId);
-            if (isreg == CM_RES_ISREG_UNREG || isreg == CM_RES_ISREG_PENDING || isreg == CM_RES_ISREG_INIT) {
+            if (isreg == CM_RES_ISREG_REG) {
+                UpdateIsworkList(resInfo->resStat[j].cmInstanceId, RES_INST_WORK_STATUS_AVAIL);
+            } else if (isreg == CM_RES_ISREG_UNREG || isreg == CM_RES_ISREG_PENDING || isreg == CM_RES_ISREG_INIT) {
                 SendRegMsgToCma(destNodeId, 1, resInfo->resStat[j].resInstanceId, resInfo->resName);
-            } else if (isreg == CM_RES_ISREG_REG || isreg == CM_RES_ISREG_NOT_SUPPORT) {
+            } else if (isreg == CM_RES_ISREG_NOT_SUPPORT && resInfo->resStat[j].status == (uint32)CM_RES_STAT_OFFLINE) {
                 UpdateIsworkList(resInfo->resStat[j].cmInstanceId, RES_INST_WORK_STATUS_AVAIL);
             }
         }
diff --git a/src/cm_server/cms_conn.cpp b/src/cm_server/cms_conn.cpp
index a122f34..7de8132 100644
--- a/src/cm_server/cms_conn.cpp
+++ b/src/cm_server/cms_conn.cpp
@@ -23,6 +23,7 @@
  */
 #include <map>
 #include <sys/eventfd.h>
+#include <sys/prctl.h>
 #include <sys/epoll.h>
 #include "cm/cm_elog.h"
 #include "cms_common.h"
@@ -38,31 +39,34 @@
 #include "cm_util.h"
 
 static const int EPOLL_TIMEOUT = 1000;
-static const int SEND_COUNT = 100;
 static const uint32 ALL_AGENT_NODE_ID = 0xffffffff;
 static const uint32 MAX_MSG_BUF_POOL_SIZE = 102400;
 static const uint32 MAX_MSG_BUF_POOL_COUNT = 200;
+static const uint32 MAX_MSG_IN_QUE = 100;
 
 struct DdbPreAgentCon {
     uint32 connCount;
     char conFlag[DDB_MAX_CONNECTIONS];
 };
 
-using MapConns = std::map<uint32, CM_Connection*>;
+using MapConns = std::map<uint64, CM_Connection*>;
 
 struct TempConns {
     MapConns tempConns;
-    uint32 tempConnSeq;
     pthread_mutex_t lock;
 };
 
+using CM_Connections = struct CM_Connections_t {
+    uint32 count;
+    uint32 max_node_id;
+    CM_Connection* connections[CM_MAX_CONNECTIONS + MAXLISTEN];
+    pthread_rwlock_t lock;
+} ;
 
 TempConns g_tempConns;
 CM_Connections gConns;
 DdbPreAgentCon g_preAgentCon = {0};
 uint8 g_msgProcFlag[MSG_CM_TYPE_CEIL];
-static int g_wakefd = -1;
-
 int32 InitConn()
 {
     MsgPoolInit(MAX_MSG_BUF_POOL_SIZE, MAX_MSG_BUF_POOL_COUNT);
@@ -247,7 +251,6 @@ void AddCMAgentConnection(CM_Connection *con)
         errno_t rc = memset_s(g_preAgentCon.conFlag, sizeof(g_preAgentCon.conFlag), 0, sizeof(g_preAgentCon.conFlag));
         securec_check_errno(rc, (void)pthread_rwlock_unlock(&gConns.lock));
     }
-    con->connSeq = 0;
     (void)pthread_rwlock_unlock(&gConns.lock);
     con->notifyCn = setNotifyCnFlagByNodeId(con->port->node_id);
 }
@@ -255,11 +258,9 @@ void AddCMAgentConnection(CM_Connection *con)
 void AddTempConnection(CM_Connection *con)
 {
     (void)pthread_mutex_lock(&g_tempConns.lock);
-    g_tempConns.tempConnSeq++;
-    con->connSeq = g_tempConns.tempConnSeq;
     (void)g_tempConns.tempConns.insert(make_pair(con->connSeq, con));
     (void)pthread_mutex_unlock(&g_tempConns.lock);
-    write_runlog(DEBUG5, "AddTempConnection:connSeq=%u\n", con->connSeq);
+    write_runlog(DEBUG5, "AddTempConnection:connSeq=%lu.\n", con->connSeq);
 }
 
 void RemoveTempConnection(CM_Connection *con)
@@ -267,7 +268,7 @@ void RemoveTempConnection(CM_Connection *con)
     (void)pthread_mutex_lock(&g_tempConns.lock);
     (void)g_tempConns.tempConns.erase(con->connSeq);
     (void)pthread_mutex_unlock(&g_tempConns.lock);
-    write_runlog(DEBUG5, "RemoveTempConnection:connSeq=%u\n", con->connSeq);
+    write_runlog(DEBUG5, "RemoveTempConnection:connSeq=%lu.\n", con->connSeq);
 }
 
 CM_Connection* GetTempConnection(uint64 connSeq)
@@ -452,20 +453,23 @@ void ConnFree(Port* conn)
     free(conn);
 }
 
-
-static void CloseAllConnections(volatile sig_atomic_t& gotConnsClose, int epollHandle)
+static void CloseAllConnections(CM_IOThread *thrinfo)
 {
     CM_Connection* con = NULL;
 
-    if (gotConnsClose == 1) {
+    if (thrinfo->gotConnClose == 1) {
         /* left some time, other thread maybe use the mem of conn. */
         cm_sleep(1);
         bool findepollHandle = false;
         (void)pthread_rwlock_wrlock(&gConns.lock);
         write_runlog(LOG, "receive signal to close all the agent connections now, conn count is %u.\n", gConns.count);
         for (uint32 i = 0; i < gConns.max_node_id + 1; i++) {
+            if (i % gIOThreads.count != thrinfo->id) {
+                continue;
+            }
+
             con = gConns.connections[i];
-            if (con != NULL && epollHandle == con->epHandle) {
+            if (con != NULL && thrinfo->epHandle == con->epHandle) {
                 Assert(con->port->remote_type == CM_AGENT);
 
                 EventDel(con->epHandle, con);
@@ -479,12 +483,12 @@ static void CloseAllConnections(volatile sig_atomic_t& gotConnsClose, int epollH
             }
         }
         if (gConns.count == 0 || g_HA_status->local_role == CM_SERVER_PRIMARY) {
-            gotConnsClose = 0;
+            thrinfo->gotConnClose = 0;
             write_runlog(LOG, "reset close conn flag.\n");
         }
         (void)pthread_rwlock_unlock(&gConns.lock);
         if (!findepollHandle) {
-            write_runlog(LOG, "can't get epollHandle %d.\n", epollHandle);
+            write_runlog(LOG, "can't get epollHandle %d.\n", thrinfo->epHandle);
         }
     }
 }
@@ -538,8 +542,9 @@ void* CM_WorkThreadMain(void* argp)
 
     CM_WorkThread* thrinfo = (CM_WorkThread*)argp;
 
-    thread_name = (thrinfo->type == CM_AGENT) ? "NORMAL WORKER" : "CTL WORKER";
-    MsgPriority pri = (thrinfo->type == CM_AGENT) ? MsgPriNormal : MsgPriHigh;
+    thread_name = (thrinfo->type == CM_AGENT) ? "AGENT_WORKER" : "CTL_WORKER";
+    MsgSourceType src = (thrinfo->type == CM_AGENT) ? MsgSrcAgent : MsgSrcCtl;
+    (void)prctl(PR_SET_NAME, thread_name);
 
     (void)pthread_detach(pthread_self());
 
@@ -548,8 +553,14 @@ void* CM_WorkThreadMain(void* argp)
     write_runlog(LOG, "cmserver pool thread %lu starting, \n", thrinfo->tid);
     SetCanProcThisMsgFun(CanProcThisMsg);
 
-    uint32 msgCount = 0;
+    uint32 preMsgCount = 0;
+    uint64 totalWaitTime = 0;
+    uint64 totalProcTime = 0;
     MsgRecvInfo *msg = NULL;
+    uint64 t0 = GetMonotonicTimeMs();
+
+    uint32 ioThreadIdx = thrinfo->id % gIOThreads.count;
+    CM_IOThread* ioThrInfo = &gIOThreads.threads[ioThreadIdx];
 
     for (;;) {
         if (got_stop == true) {
@@ -558,14 +569,16 @@ void* CM_WorkThreadMain(void* argp)
             continue;
         }
 
+        uint64 t1 = GetMonotonicTimeMs();
         thrinfo->isBusy = false;
         do {
-            msg = (MsgRecvInfo*)(getRecvMsg(pri, 1, argp));
+            msg = (MsgRecvInfo*)(getRecvMsg((PriMsgQues*)ioThrInfo->recvMsgQue, src, 1, argp));
         } while (msg == NULL);
+        uint64 t2 = GetMonotonicTimeMs();
 
         thrinfo->isBusy = true;
         write_runlog(DEBUG5,
-            "get message from recv que:remote_type:%s,connSeq=%u,agentNodeId=%u,qtype=%c,len=%d.\n",
+            "get message from recv que:remote_type:%s,connSeq=%lu,agentNodeId=%u,qtype=%c,len=%d.\n",
             msg->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
             msg->connID.connSeq,
             msg->connID.agentNodeId,
@@ -573,22 +586,35 @@ void* CM_WorkThreadMain(void* argp)
             msg->msg.len);
 
         cm_server_process_msg(msg);
+        uint64 t3 = GetMonotonicTimeMs();
         thrinfo->ProcConnID.remoteType = 0;
         thrinfo->ProcConnID.connSeq = 0;
         thrinfo->ProcConnID.agentNodeId = 0;
         FreeBufFromMsgPool((void *)msg);
         msg = NULL;
+        thrinfo->procMsgCount++;
 
-        if (msgCount % (MSG_COUNT_FOR_LOG) == 0 && msgCount >= (MSG_COUNT_FOR_LOG)) {
-            write_runlog(DEBUG1, "the thread has deal 300 msg at this time.\n");
-            msgCount = 0;
+        totalWaitTime += t2 - t1;
+        totalProcTime += t3 - t2;
+
+        if (t3 - t0 > MSG_TIME_FOR_LOG * CM_MS_COUNT_PER_SEC) {
+            write_runlog(DEBUG5,
+                "the thread process message:total count:%u,this time:%u,wait time=%lums,proc time=%lums\n",
+                thrinfo->procMsgCount,
+                thrinfo->procMsgCount - preMsgCount,
+                totalWaitTime,
+                totalProcTime);
+            totalWaitTime = 0;
+            totalProcTime = 0;
+            t0 = t3;
+            preMsgCount = thrinfo->procMsgCount;
         }
     }
 
     return thrinfo;
 }
 
-void pushMsgToQue(CM_Connection* con)
+void pushMsgToQue(CM_IOThread *thrinfo, CM_Connection* con)
 {
     uint32 totalFreeCount, totalAllocCount, freeCount, allocCount, typeCount;
 
@@ -606,21 +632,17 @@ void pushMsgToQue(CM_Connection* con)
         write_runlog(LOG,
             "alloc memory for msg failed,totalFreeCount(%u), totalAllocCount(%u). this type(%u) "
             "freeCount(%u), allocCount(%u).\n",
-            totalFreeCount,
-            totalAllocCount,
-            allocLen,
-            freeCount,
-            allocCount);
+            totalFreeCount, totalAllocCount, allocLen, freeCount, allocCount);
         return;
     }
-
+    errno_t rc = memset_s(msgInfo, (size_t)allocLen, 0, (size_t)allocLen);
+    securec_check_errno(rc, (void)rc);
     msgInfo->connID.remoteType = con->port->remote_type;
     msgInfo->msgProcFlag = 0;
     msgInfo->msg = *con->inBuffer;
     msgInfo->msg.data = (char*)&msgInfo->data[0];
     if (con->inBuffer->len > 0) {
-        errno_t rc =
-            memcpy_s(msgInfo->msg.data, (size_t)con->inBuffer->len, con->inBuffer->data, (size_t)con->inBuffer->len);
+        rc = memcpy_s(msgInfo->msg.data, (size_t)con->inBuffer->len, con->inBuffer->data, (size_t)con->inBuffer->len);
         securec_check_errno(rc, (void)rc);
     }
     msgInfo->connID.connSeq = con->connSeq;
@@ -631,7 +653,7 @@ void pushMsgToQue(CM_Connection* con)
     }
 
     write_runlog(DEBUG5,
-        "push message to recv que:remote_type:%s,connSeq=%u,agentNodeId=%u,qtype=%c,len=%d.\n",
+        "push message to recv que:remote_type:%s,connSeq=%lu,agentNodeId=%u,qtype=%c,len=%d.\n",
         msgInfo->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
         msgInfo->connID.connSeq,
         msgInfo->connID.agentNodeId,
@@ -639,11 +661,15 @@ void pushMsgToQue(CM_Connection* con)
         msgInfo->msg.len);
 
     // push the message to the queue
+    uint64 t1 = GetMonotonicTimeMs();
+    msgInfo->connID.t1 = t1;
     if (con->port->remote_type == CM_CTL) {
-        pushRecvMsg(msgInfo, MsgPriHigh);
+        pushRecvMsg((PriMsgQues*)thrinfo->recvMsgQue, msgInfo, MsgSrcCtl);
     } else {
-        pushRecvMsg(msgInfo, MsgPriNormal);
+        pushRecvMsg((PriMsgQues*)thrinfo->recvMsgQue, msgInfo, MsgSrcAgent);
     }
+    uint64 t2 = GetMonotonicTimeMs();
+    thrinfo->pushRecvQueWaitTime += (uint32)(t2 - t1);
 }
 
 static bool checkMsg(CM_Connection* con)
@@ -730,7 +756,7 @@ static void CleanConBuffer(CM_Connection *con)
  * @param  events           My Param doc
  * @param  arg              My Param doc
  */
-static void cm_server_recv_msg(void* arg)
+static void cm_server_recv_msg(CM_IOThread *thrinfo, void* arg)
 {
     CM_Connection* con = (CM_Connection*)arg;
     int qtype = 0;
@@ -754,7 +780,7 @@ static void cm_server_recv_msg(void* arg)
                 if (!checkMsg(con)) {
                     break;
                 }
-                pushMsgToQue(con);
+                pushMsgToQue(thrinfo, con);
 #ifdef KRB5
                 }
 #endif // KRB5
@@ -811,18 +837,17 @@ static void cm_server_recv_msg(void* arg)
     }
 }
 
-static void recvMsg(const volatile sig_atomic_t& gotConnsClose, int fds, struct epoll_event *events)
+static void recvMsg(int fds, struct epoll_event *events, CM_IOThread *thrinfo)
 {
-    static uint32 msgCount = 0;
     eventfd_t value = 0;
 
     for (int i = 0; i < fds; i++) {
-        if (gotConnsClose) {
+        if (thrinfo->gotConnClose) {
             return;
         }
 
-        if (events[i].data.fd == g_wakefd) {
-            int ret = eventfd_read(g_wakefd, &value);
+        if (events[i].data.fd == thrinfo->wakefd) {
+            int ret = eventfd_read(thrinfo->wakefd, &value);
             write_runlog(DEBUG5, "eventfd_read ret = %d,value=%lu.\n", ret, value);
             continue;
         }
@@ -832,16 +857,11 @@ static void recvMsg(const volatile sig_atomic_t& gotConnsClose, int fds, struct
         /* read event */
         if (events[i].events & EPOLLIN) {
             if ((con != NULL) && (con->port != NULL)) {
-                cm_server_recv_msg(con->arg);
-                msgCount++;
+                cm_server_recv_msg(thrinfo, con->arg);
+                thrinfo->recvMsgCount++;
             }
         }
     }
-
-    if (msgCount % (MSG_COUNT_FOR_LOG) == 0 && msgCount >= (MSG_COUNT_FOR_LOG)) {
-        write_runlog(DEBUG1, "the thread has received %d msg(s) at this time.\n", MSG_COUNT_FOR_LOG);
-        msgCount = 0;
-    }
 }
 
 static CM_Connection *getConnect(const MsgSendInfo* msg)
@@ -871,12 +891,49 @@ static CM_Connection *getConnect(const MsgSendInfo* msg)
         }
     }
 
-    write_runlog(DEBUG5, "getConnect:remote_type=%d,connSeq=%u,agentNodeId=%u,msg_type=%d.\n",
+    write_runlog(DEBUG5, "getConnect:remote_type=%d,connSeq=%lu,agentNodeId=%u,msg_type=%d.\n",
         msg->connID.remoteType, msg->connID.connSeq, msg->connID.agentNodeId, msgType);
 
     return con;
 }
 
+static inline uint64 GetIOThreadID(const ConnID connID)
+{
+    if (connID.remoteType == CM_AGENT) {
+        return connID.agentNodeId % gIOThreads.count;
+    } else if (connID.remoteType == CM_CTL) {
+        return connID.connSeq % gIOThreads.count;
+    }
+
+    CM_ASSERT(0);
+    return 0;
+}
+
+static void pushMsgToSendQue(MsgSendInfo *msg, MsgSourceType src)
+{
+    if (msg->connID.remoteType == CM_AGENT && msg->connID.agentNodeId == ALL_AGENT_NODE_ID) {
+        for (uint32 i = 1; i < gIOThreads.count; i++) {
+            uint32 len = sizeof(MsgSendInfo) + msg->dataSize;
+            MsgSendInfo *msg_cpy = (MsgSendInfo *)AllocBufFromMsgPool(len);
+            if (msg_cpy == NULL) {
+                write_runlog(ERROR, "pushMsgToSendQue:AllocBufFromMsgPool failed,size=%u\n", len);
+                return;
+            }
+            errno_t rc = memcpy_s(msg_cpy, len, msg, len);
+            securec_check_errno(rc, (void)rc);
+            CM_IOThread *thrinfo = &gIOThreads.threads[i];
+            pushSendMsg((PriMsgQues *)thrinfo->sendMsgQue, msg_cpy, src);            
+        }
+
+        CM_IOThread *thrinfo = &gIOThreads.threads[0];
+        pushSendMsg((PriMsgQues *)thrinfo->sendMsgQue, msg, src);
+    } else {
+        uint64 id = GetIOThreadID(msg->connID);
+        CM_IOThread *thrinfo = &gIOThreads.threads[id];
+        pushSendMsg((PriMsgQues *)thrinfo->sendMsgQue, msg, src);
+    }
+}
+
 static void InnerProcSSLAccept(const MsgSendInfo *msg, CM_Connection *con)
 {
     status_t status = CM_SUCCESS;
@@ -884,7 +941,7 @@ static void InnerProcSSLAccept(const MsgSendInfo *msg, CM_Connection *con)
     uint64 now = GetMonotonicTimeMs();
     bool retryProc = false;
     static const int retrySSLAcceptDetayMs = 10;
-    write_runlog(LOG, "[InnerProcSSLAccept] now=%lu,procTime=%lu,startTime=%lu,connSeq=%u.\n",
+    write_runlog(LOG, "[InnerProcSSLAccept] now=%lu,procTime=%lu,startTime=%lu,connSeq=%lu.\n",
         now, msg->procTime, connMsg->startConnTime, con->connSeq);
 
     status = cm_cs_ssl_accept(g_ssl_acceptor_fd, &con->port->pipe);
@@ -892,9 +949,9 @@ static void InnerProcSSLAccept(const MsgSendInfo *msg, CM_Connection *con)
         if (now < connMsg->startConnTime + CM_SSL_IO_TIMEOUT) {
             retryProc = true;
             status = CM_SUCCESS;
-            write_runlog(LOG, "[ProcessSslConnRequest]retry ssl connect,connSeq=%u.\n", con->connSeq);
+            write_runlog(LOG, "[ProcessSslConnRequest]retry ssl connect,connSeq=%lu.\n", con->connSeq);
         } else {
-            write_runlog(ERROR, "[ProcessSslConnRequest]ssl connect timeout,connSeq=%u.\n", con->connSeq);
+            write_runlog(ERROR, "[ProcessSslConnRequest]ssl connect timeout,connSeq=%lu.\n", con->connSeq);
         }
     }
 
@@ -909,9 +966,9 @@ static void InnerProcSSLAccept(const MsgSendInfo *msg, CM_Connection *con)
         errno_t rc = memcpy_s(nextConnMsg, msgSize, msg, msgSize);
         securec_check_errno(rc, (void)rc);
         nextConnMsg->procTime = now + retrySSLAcceptDetayMs;
-        pushSendMsg(nextConnMsg, MsgPriNormal);
+        pushMsgToSendQue(nextConnMsg, msg->connID.remoteType == CM_AGENT ? MsgSrcAgent : MsgSrcCtl);
         write_runlog(LOG,
-            "[ProcessSslConnRequest]retry ssl connect later,procTime=%lu,connSeq=%u.\n",
+            "[ProcessSslConnRequest]retry ssl connect later,procTime=%lu,connSeq=%lu.\n",
             nextConnMsg->procTime,
             con->connSeq);
         return;
@@ -920,7 +977,7 @@ static void InnerProcSSLAccept(const MsgSendInfo *msg, CM_Connection *con)
     (void)EventAdd(con->epHandle, (int)EPOLLIN, con);
 
     if (status != CM_SUCCESS) {
-        write_runlog(ERROR, "[ProcessSslConnRequest]srv ssl accept failed,connSeq=%u.\n", con->connSeq);
+        write_runlog(ERROR, "[ProcessSslConnRequest]srv ssl accept failed,connSeq=%lu.\n", con->connSeq);
         DisableRemoveConn(con);
         return;
     }
@@ -930,7 +987,7 @@ static void InnerProcSSLAccept(const MsgSendInfo *msg, CM_Connection *con)
         AddCMAgentConnection(con);
         RemoveTempConnection(con);
     }
-    write_runlog(LOG, "[ProcessSslConnRequest]srv ssl connect success,connSeq=%u.\n", con->connSeq);
+    write_runlog(LOG, "[ProcessSslConnRequest]srv ssl connect success,connSeq=%lu.\n", con->connSeq);
 }
 
 /**
@@ -988,7 +1045,9 @@ static int32 AssignCmaConnToThread(CM_Connection *con)
     }
 
     /* assign new connection to a work thread by round robin */
-    if (CMAssignConnToThread(con, &gIOThread) != STATUS_OK) {
+    uint32 threadID = con->port->node_id % gIOThreads.count;
+    CM_IOThread *ioThread = &gIOThreads.threads[threadID];
+    if (CMAssignConnToThread(con, ioThread) != STATUS_OK) {
         write_runlog(LOG, "Assign new CM_AGENT connection to worker thread failed, confd is %d.\n", con->fd);
         return -1;
     }
@@ -1000,8 +1059,10 @@ static int32 AssignCmctlConnToThread(CM_Connection *con)
     if (con->fd < 0) {
         return -1;
     }
+    uint64 threadID = con->connSeq % gIOThreads.count;
+    CM_IOThread *ioThread = &gIOThreads.threads[threadID];
     AddTempConnection(con);
-    if (CMAssignConnToThread(con, &gIOThread) != STATUS_OK) {
+    if (CMAssignConnToThread(con, ioThread) != STATUS_OK) {
         write_runlog(
             LOG, "Assign new connection %d to worker thread failed, confd is %d.\n", con->port->remote_type, con->fd);
         return -1;
@@ -1035,7 +1096,7 @@ static inline CM_Connection *GetCmConnect(const MsgSendInfo* msg)
     CM_Connection *con = getConnect(msg);
     if (con == NULL) {
         write_runlog(ERROR,
-            "[sendMsgs]get connection failed:remote_type=%s,connSeq=%u,agentNodeId=%u.\n",
+            "[sendMsgs]get connection failed:remote_type=%s,connSeq=%lu,agentNodeId=%u.\n",
             msg->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
             msg->connID.connSeq,
             msg->connID.agentNodeId);
@@ -1079,7 +1140,7 @@ static void CheckConnectAssignThread(const MsgSendInfo* msg)
     AssignConnToThread(*(CM_Connection **)msg->data);
 }
 
-void InnerProc(const MsgSendInfo* msg)
+void InnerProc(MsgSendInfo* msg)
 {
     switch (msg->procMethod) {
         case PM_REMOVE_CONN:
@@ -1095,13 +1156,16 @@ void InnerProc(const MsgSendInfo* msg)
         case PM_ASSIGN_CONN:
             CheckConnectAssignThread(msg);
             break;
-        default:;
+        default:
+            write_runlog(ERROR, "unknown procMethod:%d.\n", (int)msg->procMethod);
     }
+    msg->connID.t9 = GetMonotonicTimeMs();
 }
 
-static int sendMsg(const MsgSendInfo *msg, CM_Connection *con)
+static int sendMsg(MsgSendInfo *msg, CM_Connection *con)
 {
     int ret = CmsSendAndFlushMsg(con, msg->msgType, (const char *)&msg->data[0], msg->dataSize, msg->log_level);
+    msg->connID.t9 = GetMonotonicTimeMs();
     if (ret != 0) {
         write_runlog(ERROR, "CmsSendAndFlushMsg error.\n");
     } else {
@@ -1115,11 +1179,15 @@ static int sendMsg(const MsgSendInfo *msg, CM_Connection *con)
     return ret;
 }
 
-static void sendMsg(const MsgSendInfo *msg)
+static void sendMsg(uint32 id, MsgSendInfo *msg)
 {
     if (msg->connID.remoteType == CM_AGENT && msg->connID.agentNodeId == ALL_AGENT_NODE_ID) {
         (void)pthread_rwlock_wrlock(&gConns.lock);
         for (uint32 i = 0; i < gConns.max_node_id + 1; i++) {
+            if (i % gIOThreads.count != id) {
+                continue;
+            }
+
             CM_Connection *con = gConns.connections[i];
             if (con == NULL) {
                 continue;
@@ -1135,7 +1203,7 @@ static void sendMsg(const MsgSendInfo *msg)
         CM_Connection *con = getConnect(msg);
         if (con == NULL) {
             write_runlog(ERROR,
-                "[sendMsgs]get connection failed:remote_type=%s,connSeq=%u,agentNodeId=%u.\n",
+                "[sendMsgs]get connection failed:remote_type=%s,connSeq=%lu,agentNodeId=%u.\n",
                 msg->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
                 msg->connID.connSeq,
                 msg->connID.agentNodeId);
@@ -1148,31 +1216,73 @@ static void sendMsg(const MsgSendInfo *msg)
     }
 }
 
-static void procSendMsg(const MsgSendInfo *msg)
+static void procSendMsg(CM_IOThread &thrinfo, MsgSendInfo *msg)
 {
+    static const int log_interval = 5;
+    static const int expire_time = 7000;
     if (msg->procMethod == (int)PM_NONE) {
-        sendMsg(msg);
+        thrinfo.sendMsgCount++;
+        sendMsg(thrinfo.id, msg);
     } else {
         write_runlog(DEBUG5, "innerProc,method=%d.\n", msg->procMethod);
+        thrinfo.innerProcCount++;
         InnerProc(msg);
     }
+
+    if (msg->connID.t1 != 0 && msg->connID.t9 != 0 && msg->connID.t9 - msg->connID.t1 > expire_time) {
+        static volatile time_t pre = 0;
+        static volatile uint32 discard = 0;
+        time_t now = time(NULL);
+        if (now > pre + log_interval) {
+            write_runlog(WARNING,
+                "msg_delay:type=%c,procMethod=%d,msgProcFlag=%d,msgType=%d,remoteType=%d,pushRecvQue=%lu,inRecvQue=%lu,"
+                "getRecvQue=%lu,proc=%lu,pushSendQue=%lu,inSendQue=%lu,getSendQue=%lu,send=%lu,discard=%u\n",
+                msg->msgType,
+                (int)msg->procMethod,
+                (int)msg->msgProcFlag,
+                msg->dataSize > sizeof(int) ? *((int *)msg->data) : -1,
+                msg->connID.remoteType,
+                msg->connID.t2 - msg->connID.t1,
+                msg->connID.t3 - msg->connID.t2,
+                msg->connID.t4 - msg->connID.t3,
+                msg->connID.t5 - msg->connID.t4,
+                msg->connID.t6 - msg->connID.t5,
+                msg->connID.t7 - msg->connID.t6,
+                msg->connID.t8 - msg->connID.t7,
+                msg->connID.t9 - msg->connID.t8,
+                discard);
+            pre = now;
+            discard = 0;
+        } else {
+            ++discard;
+        }
+    }
 }
 
-static void sendMsgs()
+static void sendMsgs(CM_IOThread &thrinfo)
 {
-    static uint32 msgCount = 0;
-    size_t total = getSendMsgCount();
+    PriMsgQues *sendQue = (PriMsgQues*)thrinfo.sendMsgQue;
+    size_t total = getMsgCount(sendQue);
     size_t procCount = 0;
 
+    if (total == 0) {
+        return;
+    }
+
     for (;;) {
-        MsgSendInfo *msg = (MsgSendInfo*)(getSendMsg());
+        uint64 t1 = GetMonotonicTimeMs();
+        MsgSendInfo *msg = (MsgSendInfo *)(getSendMsg(sendQue, MsgSrcAgent));
         if (msg == NULL) {
-            write_runlog(DEBUG5, "no message in send que.\n");
+            uint64 t2 = GetMonotonicTimeMs();
+            thrinfo.getSendQueWaitTime += (uint32)(t2 - t1);
             break;
         }
 
+        uint64 t2 = GetMonotonicTimeMs();
+        thrinfo.getSendQueWaitTime += (uint32)(t2 - t1);
+
         write_runlog(DEBUG5,
-            "get message from send que:remote_type:%s,connSeq=%u,agentNodeId=%u,msgType=%c:%d,len=%u.\n",
+            "get message from send que:remote_type:%s,connSeq=%lu,agentNodeId=%u,msgType=%c:%d,len=%u.\n",
             msg->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
             msg->connID.connSeq,
             msg->connID.agentNodeId,
@@ -1180,14 +1290,10 @@ static void sendMsgs()
             msg->dataSize > sizeof(int) ? *((int *)msg->data) : 0,  // internal process message's datasize maybe 0
             msg->dataSize);
 
-        procSendMsg(msg);
+        procSendMsg(thrinfo, msg);
         FreeBufFromMsgPool(msg);
         msg = NULL;
 
-        if (msgCount++ % SEND_COUNT == 0) {
-            write_runlog(DEBUG1, "the thread has send %u msg at this time.\n", msgCount);
-        }
-
         procCount++;
         if (procCount >= total) {
             break;
@@ -1195,11 +1301,14 @@ static void sendMsgs()
     }
 }
 
-static void WakeSenderFunc(void)
+static void WakeSenderFunc(const ConnID connID)
 {
+    uint64 id = GetIOThreadID(connID);
+    CM_IOThread *thrinfo = &gIOThreads.threads[id];
+    int wakefd = thrinfo->wakefd;
     eventfd_t value = pthread_self();
-    if (g_wakefd >= 0) {
-        int ret = eventfd_write(g_wakefd, value);
+    if (wakefd >= 0) {
+        int ret = eventfd_write(wakefd, value);
         if (ret != 0) {
             write_runlog(ERROR, "eventfd_write failed.ret = %d,errno=%d,value=%lu.\n", ret, errno, value);
         }
@@ -1208,44 +1317,48 @@ static void WakeSenderFunc(void)
     }
 }
 
-static int CreateWakeupEvent(int epollHandle)
+static int CreateWakeupEvent(int epollHandle, int &wakefd)
 {
-    g_wakefd = eventfd(0, 0);
-    if (g_wakefd < 0) {
+    wakefd = eventfd(0, 0);
+    if (wakefd < 0) {
         write_runlog(ERROR, "eventfd error :%d.\n", errno);
         return CM_ERROR;
     }
 
-    write_runlog(LOG, "eventfd :%d.\n", g_wakefd);
+    write_runlog(LOG, "eventfd :%d.\n", wakefd);
 
-    struct epoll_event ev = {.events = (uint32)EPOLLIN, {.fd = g_wakefd}};
-    if (epoll_ctl(epollHandle, EPOLL_CTL_ADD, g_wakefd, &ev) != 0) {
+    struct epoll_event ev = {.events = (uint32)EPOLLIN, {.fd = wakefd}};
+    if (epoll_ctl(epollHandle, EPOLL_CTL_ADD, wakefd, &ev) != 0) {
         write_runlog(ERROR, "epoll_ctl error :%d.\n", errno);
-        (void)close(g_wakefd);
-        g_wakefd = -1;
+        (void)close(wakefd);
+        wakefd = -1;
         return CM_ERROR;
     }
 
     return CM_SUCCESS;
 }
 
-void* CM_IOThreadMain(void* argp)
+void *CM_IOThreadMain(void *argp)
 {
     int epollHandle;
     struct epoll_event events[MAX_EVENTS];
     sigset_t block_sig_set;
+    CM_IOThread *thrinfo = (CM_IOThread *)argp;
+    time_t time1 = time(NULL);
 
-    CM_IOThread* thrinfo = (CM_IOThread*)argp;
-    thread_name = "IO_THREAD";
+    thread_name = "IO_WORKER";
+    (void)prctl(PR_SET_NAME, thread_name);
     epollHandle = thrinfo->epHandle;
-    if (CreateWakeupEvent(epollHandle) != CM_SUCCESS) {
+    if (CreateWakeupEvent(epollHandle, thrinfo->wakefd) != CM_SUCCESS) {
         return NULL;
     }
+
+    uint64 epollWait = 0, recvMsgTime = 0, sendMsgTime = 0, count = 0;
+
     (void)pthread_detach(pthread_self());
     setBlockSigMask(&block_sig_set);
     setWakeSenderFunc(WakeSenderFunc);
     int waitTime = EPOLL_TIMEOUT;
-    volatile sig_atomic_t& gotConnsClose = got_conns_close[thrinfo->id];
     write_runlog(LOG, "cmserver pool thread %lu starting, epollfd is %d.\n", thrinfo->tid, epollHandle);
     for (;;) {
         if (got_stop == 1) {
@@ -1254,15 +1367,10 @@ void* CM_IOThreadMain(void* argp)
             continue;
         }
 
-        CloseAllConnections(gotConnsClose, epollHandle);
+        CloseAllConnections(thrinfo);
 
         thrinfo->isBusy = false;
-        /* wait for events to happen, 5s timeout */
-        if (existSendMsg()) {
-            waitTime = 1;
-        } else {
-            waitTime = EPOLL_TIMEOUT;
-        }
+        uint64 t2 = GetMonotonicTimeMs();
         int fds = epoll_pwait(epollHandle, events, MAX_EVENTS, waitTime, &block_sig_set);
         if (fds < 0) {
             if (errno != EINTR && errno != EWOULDBLOCK) {
@@ -1271,21 +1379,49 @@ void* CM_IOThreadMain(void* argp)
             }
         }
         thrinfo->isBusy = true;
+        uint64 t3 = GetMonotonicTimeMs();
         if (fds > 0) {
-            recvMsg(gotConnsClose, fds, events);
+            recvMsg(fds, events, thrinfo);
         }
+        uint64 t4 = GetMonotonicTimeMs();
+        sendMsgs(*thrinfo);
+        uint64 t5 = GetMonotonicTimeMs();
 
-        sendMsgs();
+        epollWait += t3 - t2;
+        recvMsgTime += t4 - t3;
+        sendMsgTime += t5 - t4;
+        count++;
+        time_t time2 = time(NULL);
+        if (time2 - time1 >= MSG_TIME_FOR_LOG) {
+            size_t totalRecvMsg = getMsgCount((PriMsgQues *)thrinfo->recvMsgQue);
+            size_t totalSendMsg = getMsgCount((PriMsgQues *)thrinfo->sendMsgQue);
+            if (totalRecvMsg >= MAX_MSG_IN_QUE || totalSendMsg >= MAX_MSG_IN_QUE) {
+                write_runlog(LOG,
+                    "total receive count:%u,send count:%u,innerProc count:%u;recv que size:%lu,send que size:%lu,"
+                    "push send msg wait:%u,get send msg wait:%u,epoll wait=%lu,recv msg=%lu,send msg=%lu,count=%lu\n",
+                    thrinfo->recvMsgCount, thrinfo->sendMsgCount, thrinfo->innerProcCount, totalRecvMsg, totalSendMsg,
+                    thrinfo->pushRecvQueWaitTime / CM_MS_COUNT_PER_SEC,
+                    thrinfo->getSendQueWaitTime / CM_MS_COUNT_PER_SEC,
+                    epollWait, recvMsgTime, sendMsgTime, count);
+            }
+            epollWait = recvMsgTime = sendMsgTime = 0;
+            count = 0;
+            time1 = time2;
+        }
     }
 
     (void)close(epollHandle);
-    (void)close(g_wakefd);
-    g_wakefd = -1;
+    thrinfo->epHandle = -1;
+    (void)close(thrinfo->wakefd);
+    thrinfo->wakefd = -1;
+    delete (PriMsgQues*)thrinfo->recvMsgQue;
+    thrinfo->recvMsgQue = NULL;
+    delete (PriMsgQues*)thrinfo->sendMsgQue;
+    thrinfo->sendMsgQue = NULL;
 
     return thrinfo;
 }
 
-
 /**
  * @brief add/mod an event to epoll
  *
@@ -1626,9 +1762,7 @@ static int asyncSendMsgInner(const ConnID& connID, uint8 msgProcFlag, char msgty
         write_runlog(ERROR, "RespondMsg:AllocBufFromMsgPool failed,size=%u\n", (uint32)(sizeof(MsgSendInfo) + len));
         return (int)ERR_ALLOC_MEMORY;
     }
-    msg->connID.remoteType = connID.remoteType;
-    msg->connID.agentNodeId = connID.agentNodeId;
-    msg->connID.connSeq = connID.connSeq;
+    msg->connID = connID;
     msg->procTime = 0;
     msg->log_level = log_level;
     msg->dataSize = (uint32)len;
@@ -1641,25 +1775,22 @@ static int asyncSendMsgInner(const ConnID& connID, uint8 msgProcFlag, char msgty
     }
 
     write_runlog(DEBUG1,
-        "push message to send que:remote_type:%s,connSeq=%u,agentNodeId=%u,msgType=%c,len=%u.\n",
+        "push message to send que:remote_type:%s,connSeq=%lu,agentNodeId=%u,msgType=%c,len=%u.\n",
         msg->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
         msg->connID.connSeq,
         msg->connID.agentNodeId,
         msg->msgType,
         msg->dataSize);
 
-    pushSendMsg(msg, msg->connID.remoteType == CM_AGENT ? MsgPriNormal : MsgPriHigh);
+    pushMsgToSendQue(msg, msg->connID.remoteType == CM_CTL ? MsgSrcCtl : MsgSrcAgent);
 
     return 0;
 }
 
-int RespondMsg(const MsgRecvInfo* recvMsg, char msgtype, const char *s, size_t len, int log_level)
+int RespondMsg(MsgRecvInfo* recvMsg, char msgtype, const char *s, size_t len, int log_level)
 {
-    ConnID connID;
-    connID.remoteType = recvMsg->connID.remoteType;
-    connID.connSeq = recvMsg->connID.connSeq;
-    connID.agentNodeId = recvMsg->connID.agentNodeId;
-    return asyncSendMsgInner(connID, recvMsg->msgProcFlag, msgtype, s, len, log_level);
+    recvMsg->connID.t5 = GetMonotonicTimeMs();
+    return asyncSendMsgInner(recvMsg->connID, recvMsg->msgProcFlag, msgtype, s, len, log_level);
 }
 
 int SendToAgentMsg(uint agentNodeId, char msgtype, const char *s, size_t len, int log_level)
@@ -1687,9 +1818,7 @@ void AsyncProcMsg(const MsgRecvInfo *recvMsg, IOProcMethond procMethod, const ch
         write_runlog(ERROR, "[%s] AllocBufFromMsgPool failed.\n", __FUNCTION__);
         return;
     }
-    msg->connID.remoteType = recvMsg->connID.remoteType;
-    msg->connID.connSeq = recvMsg->connID.connSeq;
-    msg->connID.agentNodeId = recvMsg->connID.agentNodeId;
+    msg->connID = recvMsg->connID;
     msg->procTime = 0;
     msg->dataSize = len;
     msg->msgType = 0;
@@ -1704,12 +1833,12 @@ void AsyncProcMsg(const MsgRecvInfo *recvMsg, IOProcMethond procMethod, const ch
     }
 
     write_runlog(logLevel,
-        "push message to send que:remote_type:%s,connSeq=%u,agentNodeId=%u,procMethod=%d,len=%u.\n",
+        "push message to send que:remote_type:%s,connSeq=%lu,agentNodeId=%u,procMethod=%d,len=%u.\n",
         msg->connID.remoteType == CM_CTL ? "CM_CTL" : "CM_AGENT",
         msg->connID.connSeq,
         msg->connID.agentNodeId,
         (int)msg->procMethod,
         msg->dataSize);
 
-    pushSendMsg(msg, msg->connID.remoteType == CM_AGENT ? MsgPriNormal : MsgPriHigh);
+    pushMsgToSendQue(msg, msg->connID.remoteType == CM_CTL ? MsgSrcCtl : MsgSrcAgent);
 }
diff --git a/src/cm_server/cms_ddb_adapter.cpp b/src/cm_server/cms_ddb_adapter.cpp
index 3e8682f..92383a3 100644
--- a/src/cm_server/cms_ddb_adapter.cpp
+++ b/src/cm_server/cms_ddb_adapter.cpp
@@ -392,7 +392,7 @@ static bool IsCurrentNodeInVoteAZ()
 
 status_t InitDdbArbitrate(DrvApiInfo *drvApiInfo)
 {
-    if (g_dbType != DB_ETCD) {
+    if (g_dbType != DB_ETCD && g_dbType != DB_SHAREDISK) {
         return CM_SUCCESS;
     }
 
@@ -909,7 +909,7 @@ DdbConn *GetNextDdbConn()
     uint32 idx = 0;
     for (uint32 i = 0; i < g_sess->count; ++i) {
         idx = (g_sess->curIdx + i) % g_sess->count;
-        if (g_sess->ddbConn[idx].state == PROCESS_IN_IDLE) {
+        if (g_sess->ddbConn[idx].state != PROCESS_IN_RUNNING) {
             break;
         }
     }
diff --git a/src/cm_server/cms_global_params.cpp b/src/cm_server/cms_global_params.cpp
index fc16549..72879e7 100644
--- a/src/cm_server/cms_global_params.cpp
+++ b/src/cm_server/cms_global_params.cpp
@@ -205,6 +205,8 @@ bool g_getHistoryCnStatusFromDdb = false;
 bool g_needIncTermToDdbAgain = false;
 bool g_clusterStarting = false;
 bool g_isSharedStorageMode = false;
+volatile bool g_needReloadSyncStandbyMode = false;
+
 volatile uint32 g_refreshDynamicCfgNum = 0;
 
 bool g_elastic_exist_node = false;
@@ -249,7 +251,7 @@ int *g_lastCnDnDisconnectTimes = NULL;
 volatile switchover_az_mode cm_switchover_az_mode = AUTOSWITCHOVER_AZ;
 volatile logic_cluster_restart_mode cm_logic_cluster_restart_mode = INITIAL_LOGIC_CLUSTER_RESTART;
 
-CM_IOThread gIOThread;
+CM_IOThreads gIOThreads;
 CM_WorkThreads gWorkThreads;
 CM_HAThreads gHAThreads;
 CM_MonitorThread gMonitorThread;
@@ -370,47 +372,6 @@ void initazArray(char azArray[][CM_AZ_NAME])
     }
 }
 
-bool is_majority_reelection_exceptional_condition(synchronous_standby_mode current_datanode_sync_mode,
-    int dynamic_primary_count, int staticPrimaryIndex, bool static_primary_and_dynamic_primary_differs)
-{
-    /*
-     * Skip majority re-election if we are in minority mode,
-     * Skip majority re-election if we are not in a multi-active standby cluster
-     * Skip majority re-election if we are doing AZ auto-switchover
-     */
-    if (cm_arbitration_mode == MINORITY_ARBITRATION || !g_multi_az_cluster || switchoverAZInProgress) {
-        return true;
-    }
-
-    /* Skip majority re-election if we don't have all AZ's available to us */
-    if ((current_cluster_az_status >= AnyAz1 && current_cluster_az_status <= FirstAz2) ||
-        (current_datanode_sync_mode >= AnyAz1 && current_datanode_sync_mode <= FirstAz2)) {
-        return true;
-    }
-
-    /*
-     * Skip majority re-election if we are just promoted to CMS primary,
-     * as we attempt to keep the original configuration of datanode primary/standbys
-     * Skip majority re-election if we don't have a static primary, which should not happen
-     */
-    if (arbitration_majority_reelection_timeout > 0 || staticPrimaryIndex < 0) {
-        return true;
-    }
-
-    /*
-     * Currently we don't have interactive communication between CM server and datanodes,
-     * and we cannot failover to a datanode whose dynamic role is already a primary.
-     * Because of these constraint, we cannot deal with multiple-dynamic-primary scenarios correctly.
-     * Leave that to partition locking later on.
-     */
-    const int onePrimary = 1;
-    if (dynamic_primary_count > onePrimary || static_primary_and_dynamic_primary_differs) {
-        return true;
-    }
-
-    return false;
-}
-
 maintenance_mode getMaintenanceMode(const uint32 &group_index)
 {
     maintenance_mode mode = MAINTENANCE_MODE_NONE;
diff --git a/src/cm_server/cms_main.cpp b/src/cm_server/cms_main.cpp
index b8b0cf8..e0a4d13 100644
--- a/src/cm_server/cms_main.cpp
+++ b/src/cm_server/cms_main.cpp
@@ -53,8 +53,8 @@ volatile sig_atomic_t g_SetReplaceCnStatus = 0;
 
 /* main thread exit after HA thread close connection */
 volatile sig_atomic_t ha_connection_closed = 0;
-volatile sig_atomic_t got_conns_close[CM_IO_THREAD_COUNT] = {0};
 pid_t cm_agent = 0;
+uint64 gConnSeq = 0;
 
 const char* g_progname;
 static char g_appPath[MAXPGPATH] = {0};
@@ -140,8 +140,8 @@ static void stop_signal_reaper(int arg)
 
 static void close_all_agent_connections(int arg)
 {
-    for (int i = 0; i < CM_IO_THREAD_COUNT; i++) {
-        got_conns_close[i] = 1;
+    for (uint32 i = 0; i < gIOThreads.count; i++) {
+        gIOThreads.threads[i].gotConnClose = 1;
     }
 }
 
@@ -1594,7 +1594,7 @@ static int32 CmSetConnState(CM_Connection *con)
         errno_t rc = memset_s(&recvMsg, sizeof(MsgRecvInfo), 0, sizeof(MsgRecvInfo));
         securec_check_errno(rc, (void)rc);
         recvMsg.connID.agentNodeId = con->port->node_id;
-        recvMsg.connID.connSeq = 0;
+        recvMsg.connID.connSeq = con->connSeq;
         recvMsg.connID.remoteType = con->port->remote_type;
         AsyncProcMsg(&recvMsg, PM_ASSIGN_CONN, (const char *)&con, sizeof(CM_Connection *));
     } else {
@@ -1866,6 +1866,7 @@ static CM_Connection* makeConnection(int fd, Port* port)
     listenCon->fd = fd;
     listenCon->port = port;
     listenCon->inBuffer = CM_makeStringInfo();
+    listenCon->connSeq = gConnSeq++;
 
     Assert(listenCon->inBuffer != NULL);
 
@@ -2620,22 +2621,41 @@ int main(int argc, char** argv)
         }
     }
 
-    status = CM_CreateWorkThreadPool(cm_thread_count);
-    if (status < 0) {
-        write_runlog(ERROR, "Create Threads Pool failed!\n");
-        CloseAllDdbSession();
-        FreeNotifyMsg();
-        return -1;
+    // worker：     total [5,1000] s  5     6   10  32 50  100 200 500 1000
+    // IO worker      a = s/3         1  2   3   10 16  33  66  166  333
+    // clt worker     b = (s-a)/2     2  2   3   11 17  33  66  167  333
+    // agent worker   c = s-a-b       2  2   4   11 17  34  68  167  334
+ 
+    // node num                       <32    <32  >32  >32
+    // agent worker                   <=4    >4   <=4  >4
+    // ctl worker                      2     2    2    4
+ 
+    const uint32 workerCountPerNode = 3;
+    uint32 totalWorker = cm_thread_count;
+    if ((uint32)cm_thread_count > g_node_num * workerCountPerNode) {
+        totalWorker = g_node_num * workerCountPerNode;
     }
-
-    status = CM_CreateIOThread();
+ 
+    uint32 ioWorkerCount = totalWorker / 3;
+    uint32 cltWorkerCount = (totalWorker - ioWorkerCount) / 2;
+    uint32 agentWorkerCount = (totalWorker - ioWorkerCount) - cltWorkerCount;
+ 
+    status = CM_CreateIOThreadPool(ioWorkerCount);
     if (status < 0) {
         write_runlog(ERROR, "Create IOThreads failed!\n");
         CloseAllDdbSession();
         FreeNotifyMsg();
         return -1;
     }
-
+ 
+    status = CM_CreateWorkThreadPool(cltWorkerCount, agentWorkerCount);
+    if (status < 0) {
+        write_runlog(ERROR, "Create Threads Pool failed!\n");
+        CloseAllDdbSession();
+        FreeNotifyMsg();
+        return -1;
+    }
+    
     g_inMaintainMode = IsMaintainFileExist();
 
     status = CM_CreateHA();
diff --git a/src/cm_server/cms_msg_que.cpp b/src/cm_server/cms_msg_que.cpp
index 4beb025..f777aab 100644
--- a/src/cm_server/cms_msg_que.cpp
+++ b/src/cm_server/cms_msg_que.cpp
@@ -22,44 +22,25 @@
  * -------------------------------------------------------------------------
  */
 
-#include <queue>
-#include <pthread.h>
 #include "elog.h"
 #include "cm_c.h"
 #include "cm_util.h"
+#include "cm_msg_buf_pool.h"
+
 #include "cms_msg_que.h"
 
 
-using MsgQueType = std::deque<const char *>;
-using MsgQuePtr = MsgQueType*;
-
-struct PriMsgQues {
-    MsgQuePtr Ques[MSG_PRI_COUNT];
-    pthread_mutex_t msg_lock;
-    pthread_cond_t msg_cond;
-    CMPrioMutex prioLock;
-};
-
-static PriMsgQues g_recvMsgQues;
-static PriMsgQues g_sendMsgQues;
-
 static wakeSenderFuncType wakeSenderFunc = NULL;
 static CanProcThisMsgFunType CanProcThisMsgFun = NULL;
 
-static void InitMsgQue(PriMsgQues &que)
+void InitMsgQue(PriMsgQues &que)
 {
-    for (int i = 0; i < (int)MSG_PRI_COUNT; i++) {
-        que.Ques[i] = NULL;
+    for (int i = 0; i < (int)MSG_SRC_COUNT; i++) {
+        CMFairMutexInit(que.ques[i].fairLock);
     }
 
-    (void)pthread_mutex_init(&que.msg_lock, NULL);
-    (void)pthread_cond_init(&que.msg_cond, NULL);
-    CMPrioMutexInit(que.prioLock);
-}
-void InitMsgQue()
-{
-    InitMsgQue(g_recvMsgQues);
-    InitMsgQue(g_sendMsgQues);
+    (void)pthread_mutex_init(&que.msgLock, NULL);
+    (void)pthread_cond_init(&que.msgCond, NULL);
 }
 
 void setWakeSenderFunc(wakeSenderFuncType func)
@@ -71,147 +52,147 @@ void SetCanProcThisMsgFun(CanProcThisMsgFunType func)
 {
     CanProcThisMsgFun = func;
 }
-static void pushToQue(PriMsgQues *priQue, MsgPriority pri, const char *msg)
+
+size_t getMsgCount(PriMsgQues *priQue)
 {
-    if (priQue->Ques[pri] == NULL) {
-        priQue->Ques[pri] = new MsgQueType;
-        if (priQue->Ques[pri] == NULL) {
-            write_runlog(ERROR, "pushToQue:out of memory.\n");
-            return;
-        }
-    }
-    priQue->Ques[pri]->push_back(msg);
-}
+    size_t count = 0;
 
-void pushRecvMsg(const MsgRecvInfo *msg, MsgPriority pri)
-{
-    Assert(pri >= 0 && pri < MSG_PRI_COUNT);
-    PriMsgQues *priQue = &g_recvMsgQues;
-
-    (void)CMPrioMutexLock(priQue->prioLock, CMMutexPrio::CM_MUTEX_PRIO_HIGH);
-    pushToQue(priQue, pri, (const char*)msg);
-    CMPrioMutexUnLock(priQue->prioLock);
-
-    (void)pthread_cond_broadcast(&priQue->msg_cond);
-}
-
-const MsgRecvInfo *getRecvMsg(MsgPriority pri, uint32 waitTime, void *threadInfo)
-{
-    Assert(pri >= 0 && pri < MSG_PRI_COUNT);
-    PriMsgQues *priQue = &g_recvMsgQues;
-    const MsgRecvInfo *msg = NULL;
-    struct timespec tv;
-
-    (void)CMPrioMutexLock(priQue->prioLock, CMMutexPrio::CM_MUTEX_PRIO_NORMAL);
-
-    for (int i = 0; i < (int)pri + 1; i++) {
-        MsgQuePtr que = priQue->Ques[i];
-        if (que == NULL) {
-            continue;
-        }
-
-        MsgQueType::iterator it = que->begin();
-        for (; it != que->end(); ++it) {
-            if (CanProcThisMsgFun == NULL || CanProcThisMsgFun(threadInfo, *it)) {
-                msg = (const MsgRecvInfo *)*it;
-                (void)que->erase(it);
-                break;
-            }
-        }
-
-        if (msg != NULL) {
-            break;
-        }
+    for (int i = 0; i < (int)MSG_SRC_COUNT; i++) {
+        MsgQuePtr que = &priQue->ques[i].que;
+        count += que->size();
     }
 
-    CMPrioMutexUnLock(priQue->prioLock);
-
-    if (msg == NULL && waitTime > 0) {
-        (void)clock_gettime(CLOCK_REALTIME, &tv);
-        tv.tv_sec = tv.tv_sec + (long long)waitTime;
-        (void)pthread_mutex_lock(&priQue->msg_lock);
-        (void)pthread_cond_timedwait(&priQue->msg_cond, &priQue->msg_lock, &tv);
-        (void)pthread_mutex_unlock(&priQue->msg_lock);
-    }
-
-    return msg;
+    return count;
 }
 
-void pushSendMsg(const MsgSendInfo *msg, MsgPriority pri)
+bool existMsg(const PriMsgQues *priQue)
 {
-    Assert(pri >= 0 && pri < MSG_PRI_COUNT);
-    PriMsgQues *priQue = &g_sendMsgQues;
-    
-    (void)CMPrioMutexLock(priQue->prioLock, CMMutexPrio::CM_MUTEX_PRIO_NORMAL);
-    pushToQue(priQue, pri, (const char*)msg);
-    CMPrioMutexUnLock(priQue->prioLock);
-    
-    if (wakeSenderFunc != NULL) {
-        wakeSenderFunc();
-    }
-}
-
-const MsgSendInfo *getSendMsg()
-{
-    const MsgSendInfo *msg = NULL;
-    PriMsgQues *priQue = &g_sendMsgQues;
-
-    uint64 now = GetMonotonicTimeMs();
-    (void)CMPrioMutexLock(priQue->prioLock, CMMutexPrio::CM_MUTEX_PRIO_HIGH);
-
-    for (int i = 0; i < (int)MSG_PRI_COUNT; i++) {
-        MsgQuePtr que = priQue->Ques[i];
-        if (que == NULL) {
-            continue;
-        }
-
-        MsgQueType::iterator it = que->begin();
-        for (; it != que->end(); ++it) {
-            const MsgSendInfo* sendMsg = (MsgSendInfo*)(*it);
-            if (sendMsg->procTime == 0 || sendMsg->procTime <= now) {
-                msg = (const MsgSendInfo *)(*it);
-                (void)que->erase(it);
-                break;
-            }
-        }
-
-        if (msg != NULL) {
-            break;
-        }
-    }
-
-    CMPrioMutexUnLock(priQue->prioLock);
-
-    return msg;
-}
-bool existSendMsg()
-{
-    PriMsgQues *priQue = &g_sendMsgQues;
-    for (int i = 0; i < (int)MSG_PRI_COUNT; i++) {
-        MsgQuePtr que = priQue->Ques[i];
-        if (que != NULL) {
-            if (!que->empty()) {
-                return true;
-            }
+    for (int i = 0; i < (int)MSG_SRC_COUNT; i++) {
+        ConstMsgQuePtr que = &priQue->ques[i].que;
+        if (!que->empty()) {
+            return true;
         }
     }
 
     return false;
 }
 
-size_t getSendMsgCount()
+void pushRecvMsg(PriMsgQues *priQue, MsgRecvInfo *msg, MsgSourceType src)
 {
-    PriMsgQues *priQue = &g_sendMsgQues;
-    size_t count = 0;
+    Assert(src >= 0 && src < MSG_SRC_COUNT);
 
-    (void)CMPrioMutexLock(priQue->prioLock, CMMutexPrio::CM_MUTEX_PRIO_HIGH);
-    for (int i = 0; i < (int)MSG_PRI_COUNT; i++) {
-        MsgQuePtr que = priQue->Ques[i];
-        if (que != NULL) {
-            count += que->size();
-        }
-    }
-    CMPrioMutexUnLock(priQue->prioLock);
+    (void)CMFairMutexLock(priQue->ques[src].fairLock, CMFairMutexType::CM_MUTEX_WRITE);
+    msg->connID.t2 = GetMonotonicTimeMs();
+    priQue->ques[src].que.push_back((const char *)msg);
+    CMFairMutexUnLock(priQue->ques[src].fairLock);
 
-    return count;
+    (void)pthread_cond_broadcast(&priQue->msgCond);
 }
+
+static const MsgRecvInfo *getRecvMsgInner(PriMsgQues *priQue, MsgSourceType src, void *threadInfo)
+{
+    Assert(src >= 0 && src < MSG_SRC_COUNT);
+    MsgRecvInfo *msg = NULL;
+    uint64 t3 = GetMonotonicTimeMs();
+
+    if (!existMsg(priQue)) {
+        return NULL;
+    }
+
+    for (int i = 0; i < (int)MSG_SRC_COUNT; i++) {
+        MsgQuePtr que = &priQue->ques[src].que;
+        (void)CMFairMutexLock(priQue->ques[src].fairLock, CMFairMutexType::CM_MUTEX_READ);
+        MsgQueType::iterator it = que->begin();
+        for (; it != que->end(); ++it) {
+            if (CanProcThisMsgFun == NULL || CanProcThisMsgFun(threadInfo, *it)) {
+                msg = (MsgRecvInfo *)*it;
+                (void)que->erase(it);
+                msg->connID.t3 = t3;
+                msg->connID.t4 = GetMonotonicTimeMs();
+                break;
+            }
+        }
+        CMFairMutexUnLock(priQue->ques[src].fairLock);
+
+        if (msg != NULL) {
+            break;
+        }
+        src = (src == MsgSrcAgent) ? MsgSrcCtl : MsgSrcAgent;  // switch src type;
+    }
+
+    return msg;
+}
+
+const MsgRecvInfo *getRecvMsg(PriMsgQues *priQue, MsgSourceType src, uint32 waitTime, void *threadInfo)
+{
+    struct timespec tv;
+    if (priQue == NULL) {
+        return NULL;
+    }
+
+    const MsgRecvInfo* msg = getRecvMsgInner(priQue, src, threadInfo);
+
+    if (msg == NULL && waitTime > 0) {
+        (void)clock_gettime(CLOCK_REALTIME, &tv);
+        tv.tv_sec = tv.tv_sec + (long long)waitTime;
+        (void)pthread_mutex_lock(&priQue->msgLock);
+        (void)pthread_cond_timedwait(&priQue->msgCond, &priQue->msgLock, &tv);
+        (void)pthread_mutex_unlock(&priQue->msgLock);
+    }
+
+    return msg;
+}
+
+void pushSendMsg(PriMsgQues *priQue, MsgSendInfo *msg, MsgSourceType src)
+{
+    Assert(src >= 0 && src < MSG_SRC_COUNT);
+    ConnID connID = msg->connID;
+    (void)CMFairMutexLock(priQue->ques[src].fairLock, CMFairMutexType::CM_MUTEX_WRITE);
+    priQue->ques[src].que.push_back((const char*)msg);
+    msg->connID.t6 = GetMonotonicTimeMs();
+    CMFairMutexUnLock(priQue->ques[src].fairLock);
+
+    if (wakeSenderFunc != NULL) {
+        wakeSenderFunc(connID);
+    }
+}
+
+const MsgSendInfo *getSendMsg(PriMsgQues *priQue, MsgSourceType src)
+{
+    const MsgSendInfo *msg = NULL;
+
+    if (!existMsg(priQue)) {
+        return NULL;
+    }
+
+    uint64 now = GetMonotonicTimeMs();
+    for (int i = 0; i < (int)MSG_SRC_COUNT; i++) {
+        MsgQuePtr que = &priQue->ques[src].que;
+        (void)CMFairMutexLock(priQue->ques[src].fairLock, CMFairMutexType::CM_MUTEX_READ);
+        MsgQueType::iterator it = que->begin();
+        for (; it != que->end(); ++it) {
+            MsgSendInfo *sendMsg = (MsgSendInfo *)(*it);
+            if (sendMsg->procTime == 0 || sendMsg->procTime <= now) {
+                msg = sendMsg;
+                (void)que->erase(it);
+                sendMsg->connID.t7 = now;
+                sendMsg->connID.t8 = GetMonotonicTimeMs();
+                break;
+            }
+        }
+        CMFairMutexUnLock(priQue->ques[src].fairLock);
+
+        if (msg != NULL) {
+            break;
+        }
+        src = (src == MsgSrcAgent) ? MsgSrcCtl : MsgSrcAgent;
+    }
+
+    return msg;
+}
+
+bool existSendMsg(const PriMsgQues *priQue)
+{
+    return existMsg(priQue);
+}
+
diff --git a/src/cm_server/cms_process_messages_ctl.cpp b/src/cm_server/cms_process_messages_ctl.cpp
index 1381e65..a9fc31d 100644
--- a/src/cm_server/cms_process_messages_ctl.cpp
+++ b/src/cm_server/cms_process_messages_ctl.cpp
@@ -550,11 +550,6 @@ void process_ctl_to_cm_switchover_full_msg(
     cm_to_ctl_command_ack msgSwitchoverFullAck = {0};
     msgSwitchoverFullAck.msg_type = MSG_CM_CTL_SWITCHOVER_FULL_ACK;
 
-    if (CheckEnableFlag()) {
-        msgSwitchoverFullAck.command_result = CM_INVALID_COMMAND;
-        (void)RespondMsg(recvMsgInfo, 'S', (char *)(&msgSwitchoverFullAck), sizeof(cm_to_ctl_command_ack));
-        return;
-    }
     if (backup_open != CLUSTER_PRIMARY) {
         msgSwitchoverFullAck.msg_type = MSG_CM_CTL_BACKUP_OPEN;
         (void)RespondMsg(recvMsgInfo, 'S', (char *)(&msgSwitchoverFullAck), sizeof(cm_to_ctl_command_ack));
@@ -928,11 +923,6 @@ void ProcessCtlToCmSwitchoverFullCheckMsg(MsgRecvInfo* recvMsgInfo)
     cm_to_ctl_switchover_full_check_ack msgSwitchoverFullCheckAck;
     msgSwitchoverFullCheckAck.msg_type = MSG_CM_CTL_SWITCHOVER_FULL_CHECK_ACK;
 
-    if (CheckEnableFlag()) {
-        msgSwitchoverFullCheckAck.switchoverDone = INVALID_COMMAND;
-        (void)RespondMsg(recvMsgInfo, 'S', (char*)(&msgSwitchoverFullCheckAck), sizeof(msgSwitchoverFullCheckAck));
-        return;
-    }
     int32 switchoverDone = GetSwitchoverDone("[ProcessCtlToCmSwitchoverFullCheckMsg]");
     msgSwitchoverFullCheckAck.switchoverDone = switchoverDone;
 
@@ -958,11 +948,6 @@ void ProcessCtlToCmSwitchoverAzCheckMsg(MsgRecvInfo* recvMsgInfo)
     cm_to_ctl_switchover_az_check_ack msgSwitchoverAZCheckAck;
     msgSwitchoverAZCheckAck.msg_type = MSG_CM_CTL_SWITCHOVER_AZ_CHECK_ACK;
 
-    if (CheckEnableFlag()) {
-        msgSwitchoverAZCheckAck.switchoverDone = INVALID_COMMAND;
-        (void)RespondMsg(recvMsgInfo, 'S', (char *)(&msgSwitchoverAZCheckAck), sizeof(msgSwitchoverAZCheckAck));
-        return;
-    }
     int32 switchoverDone = GetSwitchoverDone("[ProcessCtlToCmSwitchoverAzCheckMsg]");
     msgSwitchoverAZCheckAck.switchoverDone = switchoverDone;
 
@@ -2153,11 +2138,6 @@ void ProcessCtlToCmSwitchoverAllMsg(MsgRecvInfo* recvMsgInfo, const ctl_to_cm_sw
     cm_to_ctl_command_ack msgSwitchoverAllAck = { 0 };
 
     msgSwitchoverAllAck.msg_type = MSG_CM_CTL_SWITCHOVER_ALL_ACK;
-    if (CheckEnableFlag()) {
-        msgSwitchoverAllAck.command_result = CM_INVALID_COMMAND;
-        (void)RespondMsg(recvMsgInfo, 'S', (char *)(&msgSwitchoverAllAck), sizeof(cm_to_ctl_command_ack));
-        return;
-    }
     if (backup_open != CLUSTER_PRIMARY) {
         msgSwitchoverAllAck.msg_type = MSG_CM_CTL_BACKUP_OPEN;
         (void)RespondMsg(recvMsgInfo, 'S', (char *)(&msgSwitchoverAllAck), sizeof(cm_to_ctl_command_ack));
diff --git a/src/cm_server/cms_process_messages_res.cpp b/src/cm_server/cms_process_messages_res.cpp
index 05f063f..dfad408 100644
--- a/src/cm_server/cms_process_messages_res.cpp
+++ b/src/cm_server/cms_process_messages_res.cpp
@@ -217,16 +217,16 @@ static const char* GetClusterResStatStr(MaxClusterResStatus stat)
     return "";
 }
 
-MaxClusterResStatus GetResNodeStat(uint32 nodeId)
+MaxClusterResStatus GetResNodeStat(uint32 nodeId, int logLevel)
 {
     uint32 ind = FindNodeReportResInterByNodeId(nodeId);
     if (ind < g_node_num) {
         if (IsReportTimeout(g_resNodeStat[ind].reportInter)) {
-            write_runlog(LOG, "recv node(%u) agent report res status msg timeout.\n", nodeId);
+            write_runlog(logLevel, "recv node(%u) agent report res status msg timeout.\n", nodeId);
             return MAX_CLUSTER_STATUS_UNAVAIL;
         }
         if (g_resNodeStat[ind].isAvail != MAX_CLUSTER_STATUS_AVAIL) {
-            write_runlog(LOG, "res node(%u) stat is (%s).\n", nodeId, GetClusterResStatStr(g_resNodeStat[ind].isAvail));
+            write_runlog(logLevel, "node(%u) stat (%s).\n", nodeId, GetClusterResStatStr(g_resNodeStat[ind].isAvail));
         }
         return g_resNodeStat[ind].isAvail;
     } else {
@@ -432,7 +432,6 @@ void ReleaseResLockOwner(const char *resName, uint32 instId)
         return;
     }
 
-    bool isSuccess = true;
     for (uint32 i = 0; i < kvCount; ++i) {
         if (kvs[i].key[0] == '\0' || kvs[i].value[0] == '\0') {
             break;
@@ -441,18 +440,11 @@ void ReleaseResLockOwner(const char *resName, uint32 instId)
             continue;
         }
         if (DelKeyInDdb(kvs[i].key, (uint32)strlen(kvs[i].key)) != CM_SUCCESS) {
-            write_runlog(ERROR, "[CLIENT] ddb del failed. key=%s, value=%s.\n", kvs[i].key, kvs[i].value);
-            isSuccess = false;
+            write_runlog(ERROR, "[CLIENT] release lock failed. key=%s, value=%s.\n", kvs[i].key, kvs[i].value);
         } else {
-            write_runlog(LOG, "[CLIENT] ddb del success. key=%s, value=%s.\n", kvs[i].key, kvs[i].value);
+            write_runlog(LOG, "[CLIENT] release lock success. key=%s, value=%s.\n", kvs[i].key, kvs[i].value);
         }
     }
-
-    if (isSuccess) {
-        write_runlog(LOG, "[CLIENT] res(%s) inst(%u) release all lock success.\n", resName, instId);
-    } else {
-        write_runlog(ERROR, "[CLIENT] res(%s) inst(%u) release all lock failed.\n", resName, instId);
-    }
 }
 
 static ClientError CmResLock(const CmaToCmsResLock *lockMsg)
diff --git a/src/cm_server/cms_sync_dynamic_info.cpp b/src/cm_server/cms_sync_dynamic_info.cpp
index de973d6..624cd43 100644
--- a/src/cm_server/cms_sync_dynamic_info.cpp
+++ b/src/cm_server/cms_sync_dynamic_info.cpp
@@ -25,6 +25,7 @@
 #include "cms_ddb.h"
 #include "cms_global_params.h"
 #include "cms_write_dynamic_config.h"
+#include "cms_common.h"
 
 static bool IsCnStatusParameterValid(const char *cnId, const char *cnStatus)
 {
@@ -193,6 +194,7 @@ void* SyncDynamicInfoFromDdb(void* arg)
 
         if (IsDdbHealth(DDB_PRE_CONN)) {
             write_runlog(DEBUG1, "will sync instance info from ddb. \n");
+            CmsSyncStandbyMode();
             if ((cm_arbitration_mode == MINORITY_ARBITRATION || cm_server_start_mode == MINORITY_START) &&
                 g_multi_az_cluster) {
                 write_runlog(LOG,
diff --git a/src/cm_server/cms_threads.cpp b/src/cm_server/cms_threads.cpp
index 375d5f5..fdd3405 100644
--- a/src/cm_server/cms_threads.cpp
+++ b/src/cm_server/cms_threads.cpp
@@ -194,9 +194,9 @@ int CM_CreateMonitorStopNode(void)
     return 0;
 }
 
-int CM_CreateIOThread(void)
+int CM_CreateIOThread(CM_IOThread &ioThread, uint32 id)
 {
-    errno_t rc = memset_s(&gIOThread, sizeof(CM_IOThread), 0, sizeof(CM_IOThread));
+    errno_t rc = memset_s(&ioThread, sizeof(CM_IOThread), 0, sizeof(CM_IOThread));
     securec_check_errno(rc, (void)rc);
 
     /* create epoll fd, MAX_EVENTS just a HINT */
@@ -206,41 +206,51 @@ int CM_CreateIOThread(void)
         return -1;
     }
 
-    gIOThread.epHandle = epollFd;
-    gIOThread.type = 0;
-    gIOThread.isBusy = false;
+    ioThread.epHandle = epollFd;
+    ioThread.id = id;
+    ioThread.isBusy = false;
+    ioThread.recvMsgQue = new PriMsgQues;
+    ioThread.sendMsgQue = new PriMsgQues;
+    InitMsgQue(*((PriMsgQues *)ioThread.sendMsgQue));
+    InitMsgQue(*((PriMsgQues *)ioThread.recvMsgQue));
 
-    if (pthread_create(&(gIOThread.tid), NULL, CM_IOThreadMain, &gIOThread) != 0) {
+    if (pthread_create(&(ioThread.tid), NULL, CM_IOThreadMain, &ioThread) != 0) {
         return -1;
     }
+
     return 0;
 }
 
+int CM_CreateIOThreadPool(uint32 thrCount)
+{
+    int err;
+    for (uint32 i = 0; i < thrCount; i++) {
+        err = CM_CreateIOThread(gIOThreads.threads[i], i);
+        if (err != 0) {
+            return err;
+        }
+        gIOThreads.count++;
+    }
 
-int CM_CreateWorkThreadPool(int thrCount)
+    return 0;
+}
+
+static int createWorkerThread(uint32 thrCount, int type)
 {
     CM_WorkThread* thrinfo = NULL;
-    int err;
     errno_t rc = 0;
-    int trueThrCount = thrCount;
+    int err;
 
-    /* include cm_ctl, so g_node_num need add. */
-    int ctlThreadNum = GetCtlThreadNum();
-    if (thrCount > ((int)g_node_num + ctlThreadNum)) {
-        trueThrCount = ((int)g_node_num + ctlThreadNum);
-    }
-    if (trueThrCount <= ctlThreadNum) {
-        trueThrCount += ctlThreadNum;
-    }
+    for (uint32 i = 0; i < thrCount; i++) {
+        uint32 thread_idx = gWorkThreads.count;
+        thrinfo = &(gWorkThreads.threads[thread_idx]);
 
-    for (int i = 0; i < trueThrCount; i++) {
-        thrinfo = &(gWorkThreads.threads[i]);
-
-        rc = memset_s(&gWorkThreads.threads[i], sizeof(CM_WorkThread), 0, sizeof(CM_WorkThread));
+        rc = memset_s(thrinfo, sizeof(CM_WorkThread), 0, sizeof(CM_WorkThread));
         securec_check_errno(rc, (void)rc);
 
-        thrinfo->type = (i >= trueThrCount - ctlThreadNum) ? CM_CTL : CM_AGENT;
+        thrinfo->type = type;
         thrinfo->isBusy = false;
+        thrinfo->id = i;
 
         if ((err = pthread_create(&thrinfo->tid, NULL, CM_WorkThreadMain, thrinfo)) != 0) {
             write_runlog(ERROR, "Failed to create a new CM_WorkThreadMain %d: %d\n", err, errno);
@@ -249,6 +259,21 @@ int CM_CreateWorkThreadPool(int thrCount)
 
         gWorkThreads.count++;
     }
+
+    return 0;
+}
+
+int CM_CreateWorkThreadPool(uint32 ctlWorkerCount, uint32 agentWorkerCount)
+{
+    gWorkThreads.count = 0;
+    if (createWorkerThread(ctlWorkerCount, CM_CTL) != 0) {
+        return -1;
+    }
+
+    if (createWorkerThread(agentWorkerCount, CM_AGENT) != 0) {
+        return -1;
+    }
+
     return 0;
 }
 
diff --git a/src/include/cm/cm_adapter/cm_ddb_adapter.h b/src/include/cm/cm_adapter/cm_ddb_adapter.h
index 3456c8f..8079854 100644
--- a/src/include/cm/cm_adapter/cm_ddb_adapter.h
+++ b/src/include/cm/cm_adapter/cm_ddb_adapter.h
@@ -61,7 +61,7 @@ typedef enum DDB_ROLE {
     DDB_ROLE_CEIL,
 } DDB_ROLE;
 
-typedef enum { PROCESS_IN_RUNNING = 0, PROCESS_IN_IDLE } PROCESS_STATE;
+typedef enum { PROCESS_IN_INIT = 0, PROCESS_IN_RUNNING, PROCESS_IN_IDLE } PROCESS_STATE;
 
 typedef enum { DDB_PRE_CONN = 0, DDB_HEAL_COUNT } DDB_CHECK_MOD;
 
diff --git a/src/include/cm/cm_adapter/cm_sharedisk/cm_voting_disk.h b/src/include/cm/cm_adapter/cm_sharedisk/cm_voting_disk.h
index 8f6ebe0..c32816c 100644
--- a/src/include/cm/cm_adapter/cm_sharedisk/cm_voting_disk.h
+++ b/src/include/cm/cm_adapter/cm_sharedisk/cm_voting_disk.h
@@ -44,8 +44,8 @@ status_t InitVotingDiskHandler(const char *scsiDev, uint32 offset);
 status_t InitVotingDisk(const char *votingDiskPath);
 status_t UpdateAllNodeHeartBeat();
 void ResetVotingdiskHeartBeat();
-VotingDiskStatus GetNodeHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout);
+VotingDiskStatus GetNodeHeartbeatStat(uint32 nodeIndex, uint32 diskTimeout, int logLevel);
 status_t AllocVotingDiskMem();
 void FreeVotingDiskMem();
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/include/cm/cm_agent/cma_instance_management_res.h b/src/include/cm/cm_agent/cma_instance_management_res.h
index 74064f0..262680a 100644
--- a/src/include/cm/cm_agent/cma_instance_management_res.h
+++ b/src/include/cm/cm_agent/cma_instance_management_res.h
@@ -28,7 +28,7 @@
 #include "cm_misc.h"
 
 int SystemExecute(const char *scriptPath, const char *oper, uint32 timeout);
-void StartOneResInst(const CmResConfList *conf);
+status_t StartOneResInst(const CmResConfList *conf);
 void StopOneResInst(const CmResConfList *conf);
 void OneResInstShutdown(const CmResConfList *oneResConf);
 status_t RegOneResInst(const CmResConfList *conf, uint32 destInstId);
diff --git a/src/include/cm/cm_elog.h b/src/include/cm/cm_elog.h
index 3d561fb..8d5b305 100644
--- a/src/include/cm/cm_elog.h
+++ b/src/include/cm/cm_elog.h
@@ -49,6 +49,7 @@ typedef enum KeyEventTypeEn {
     KEY_EVENT_RECOVER = 16,
     KEY_EVENT_REFRESH_OBS_DELETE_TEXT = 17,
     KEY_EVENT_DROP_CN_OBS_XLOG = 18,
+    KEY_EVENT_RES_ARBITRATE = 19,
     KEY_EVENT_TYPE_CEIL, // new event types should be added before this.
 } KeyEventType;
 
@@ -70,4 +71,4 @@ void write_runlog(int elevel, const char *fmt, ...) __attribute__((format(printf
 void write_stderr(const char *fmt, ...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
 void WriteKeyEventLog(KeyEventType keyEventType, uint32 instanceId, const char *fmt, ...);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/include/cm/cm_misc_res.h b/src/include/cm/cm_misc_res.h
index 90c7805..c22b937 100644
--- a/src/include/cm/cm_misc_res.h
+++ b/src/include/cm/cm_misc_res.h
@@ -50,6 +50,8 @@ const uint32 CM_MAX_VIP_COUNT = 16;
 #define CUS_RES_CHECK_STAT_UNKNOWN  2
 #define CUS_RES_CHECK_STAT_TIMEOUT  137
 
+#define CUS_RES_START_FAIL_DEPEND_NOT_ALIVE 6
+
 #define RES_INSTANCE_ID_MIN 20000
 #define RES_INSTANCE_ID_MAX 30000
 
diff --git a/src/include/cm/cm_persist/share_disk_lock.h b/src/include/cm/cm_persist/share_disk_lock.h
index bea2206..18c64f6 100644
--- a/src/include/cm/cm_persist/share_disk_lock.h
+++ b/src/include/cm/cm_persist/share_disk_lock.h
@@ -102,9 +102,8 @@ status_t CmAllocDlock(dlock_t *lock, uint64 lockAddr, int64 instId);
 void CmInitDlock(dlock_t *lock, uint64 lockAddr, int64 instId);        // init lockw header and body
 void CmInitDlockHeader(dlock_t *lock, uint64 lockAddr, int64 instId);  // init lockw and lockr header
 status_t CmDiskLockS(dlock_t *lock, const char *scsiDev, int32 fd);
-status_t CmDiskLockfS(dlock_t *lock, const char *scsiDev);
 
 int32 CmDiskLock(dlock_t *lock, int32 fd);
-status_t CmDiskLockf(dlock_t *lock, int32 fd);
+status_t CmDiskLockf(dlock_t *lock, int32 fd, int64 lockTime);
 status_t CmGetDlockInfo(dlock_t *lock, int32 fd);
 #endif
diff --git a/src/include/cm/cm_persist/share_disk_lock_api.h b/src/include/cm/cm_persist/share_disk_lock_api.h
index 32fed90..29f600c 100644
--- a/src/include/cm/cm_persist/share_disk_lock_api.h
+++ b/src/include/cm/cm_persist/share_disk_lock_api.h
@@ -46,5 +46,4 @@ typedef struct _DISK_LRW_HANDLER {
 } diskLrwHandler;
 
 status_t InitDiskLockHandle(diskLrwHandler *sdLrwHandler, const char *scsi_dev, uint32 offset, int64 instId);
-status_t ShareDiskGetDlock(diskLrwHandler *handler);
 #endif
diff --git a/src/include/cm/cm_server/cm_server.h b/src/include/cm/cm_server/cm_server.h
index d88db4d..ab26695 100644
--- a/src/include/cm/cm_server/cm_server.h
+++ b/src/include/cm/cm_server/cm_server.h
@@ -83,19 +83,14 @@ typedef struct CM_Connection_t {
     gss_buffer_desc gss_outbuf;     /* GSS output token */
 #endif // KRB5
     NotifyCn_t notifyCn;
-    uint32 connSeq;
+    uint64 connSeq;
 } CM_Connection;
 
-typedef struct CM_Connections_t {
-    uint32 count;
-    uint32 max_node_id;
-    CM_Connection* connections[CM_MAX_CONNECTIONS + MAXLISTEN];
-    pthread_rwlock_t lock;
-} CM_Connections;
-
 typedef struct CM_WorkThread_t {
     pthread_t tid;
+    uint32 id;
     int type;
+    uint32 procMsgCount;
     ConnID ProcConnID; // which connection is processing now;
     volatile bool isBusy;
 } CM_WorkThread;
@@ -124,12 +119,25 @@ typedef struct CM_MonitorNodeStopThread_t {
 
 typedef struct {
     pthread_t tid;
-    int type;
     uint32 id;
     int epHandle;
+    int wakefd;
     volatile bool isBusy;
+    volatile int gotConnClose;
+    void* recvMsgQue;
+    void* sendMsgQue;
+    uint32 pushRecvQueWaitTime;
+    uint32 getSendQueWaitTime;
+    uint32 recvMsgCount;
+    uint32 sendMsgCount;
+    uint32 innerProcCount;
 } CM_IOThread;
 
+typedef struct CM_IOThreads_t {
+    uint32 count;
+    CM_IOThread threads[CM_MAX_THREADS];
+} CM_IOThreads;
+
 typedef enum CM_ThreadStatus_e {
     CM_THREAD_STARTING,
     CM_THREAD_RUNNING,
@@ -222,7 +230,6 @@ typedef struct CM_ConnDdbInfo_t {
 #define INSTANCE_ARBITRATE_DELAY_NO_SET 0
 #define INSTANCE_ARBITRATE_DELAY_HAVE_SET 1
 
-#define CM_IO_THREAD_COUNT 1
 constexpr int NO_NEED_TO_SET_PARAM = -1;
 
 typedef struct DatanodeDynamicStatusT {
@@ -315,7 +322,6 @@ extern volatile sig_atomic_t got_stop;
 extern volatile sig_atomic_t g_gotParameterReload;
 extern volatile sig_atomic_t g_SetReplaceCnStatus;
 extern volatile sig_atomic_t ha_connection_closed;
-extern volatile sig_atomic_t got_conns_close[CM_IO_THREAD_COUNT];
 extern char g_replaceCnStatusFile[MAX_PATH_LEN];
 
 void ProcessStartupPacket(int epollFd, void* arg);
diff --git a/src/include/cm/cm_server/cms_common.h b/src/include/cm/cm_server/cms_common.h
index a0aefa5..445f060 100644
--- a/src/include/cm/cm_server/cms_common.h
+++ b/src/include/cm/cm_server/cms_common.h
@@ -56,6 +56,7 @@ void GetDelayArbitTimeFromConf();
 void GetBackupOpenConfig();
 void GetDelayArbitClusterTimeFromConf();
 void GetDnArbitrateMode();
+void CmsSyncStandbyMode();
 
 bool EnableShareDisk();
 
diff --git a/src/include/cm/cm_server/cms_conn.h b/src/include/cm/cm_server/cms_conn.h
index f1ff972..81a651c 100644
--- a/src/include/cm/cm_server/cms_conn.h
+++ b/src/include/cm/cm_server/cms_conn.h
@@ -34,7 +34,7 @@
 #endif // KRB5
 
 #define CM_SERVER_PACKET_ERROR_MSG 128
-#define MSG_COUNT_FOR_LOG 300
+#define MSG_TIME_FOR_LOG  5
 #include "cms_msg_que.h"
 
 enum IOProcMethond {
@@ -71,7 +71,7 @@ void EventDel(int epollFd, CM_Connection* con);
 void CMPerformAuthentication(CM_Connection* con);
 int ReadCommand(CM_Connection *con, const char *str);
 int get_authentication_type(const char* config_file);
-int RespondMsg(const MsgRecvInfo* recvMsg, char msgtype, const char *s, size_t len, int log_level = LOG);
+int RespondMsg(MsgRecvInfo* recvMsg, char msgtype, const char *s, size_t len, int log_level = LOG);
 int SendToAgentMsg(uint agentNodeId, char msgtype, const char *s, size_t len, int log_level = LOG);
 int BroadcastMsg(char msgtype, const char *s, size_t len, int log_level = LOG);
 void AsyncProcMsg(const MsgRecvInfo* recvMsg, IOProcMethond procMethod, const char *s, uint32 len);
diff --git a/src/include/cm/cm_server/cms_global_params.h b/src/include/cm/cm_server/cms_global_params.h
index 8ec6be5..ad8fbbd 100644
--- a/src/include/cm/cm_server/cms_global_params.h
+++ b/src/include/cm/cm_server/cms_global_params.h
@@ -289,7 +289,7 @@ extern pthread_rwlock_t g_sendQueueRwlock;
 extern pthread_rwlock_t g_recvQueueRwlock;
 extern synchronous_standby_mode current_cluster_az_status;
 extern CM_WorkThreads gWorkThreads;
-extern CM_IOThread gIOThread;
+extern CM_IOThreads gIOThreads;
 extern CM_HAThreads gHAThreads;
 extern CM_MonitorThread gMonitorThread;
 extern CM_MonitorNodeStopThread gMonitorNodeStopThread;
@@ -411,6 +411,7 @@ extern bool g_getHistoryDnStatusFromDdb;
 extern bool g_getHistoryCnStatusFromDdb;
 extern volatile uint32 g_refreshDynamicCfgNum;
 extern bool g_needIncTermToDdbAgain;
+extern volatile bool g_needReloadSyncStandbyMode;
 extern bool g_instance_status_for_cm_server_pending[CM_PRIMARY_STANDBY_NUM];
 extern bool g_clusterStarting;
 /* thread count of thread pool */
diff --git a/src/include/cm/cm_server/cms_msg_que.h b/src/include/cm/cm_server/cms_msg_que.h
index 0336f2c..0b72beb 100644
--- a/src/include/cm/cm_server/cms_msg_que.h
+++ b/src/include/cm/cm_server/cms_msg_que.h
@@ -24,54 +24,84 @@
 #ifndef CMS_MSG_QUE_H
 #define CMS_MSG_QUE_H
 
+#include <queue>
+#include <pthread.h>
 #include "c.h"
 #include "stringinfo.h"
+#include "cm_util.h"
 
-enum MsgPriority {
-    MsgPriHigh = 0,
-    MsgPriNormal,
-    MsgPriLow,
-    MSG_PRI_COUNT
+enum MsgSourceType {
+    MsgSrcAgent = 0,
+    MsgSrcCtl,
+    MSG_SRC_COUNT
 };
 
 struct ConnID {
     int32 remoteType; // CM_AGENT,CM_CTL
-    uint32 connSeq;
+    uint64 connSeq;
     uint32 agentNodeId;
+    uint64 t1;
+    uint64 t2;
+    uint64 t3;
+    uint64 t4;
+    uint64 t5;
+    uint64 t6;
+    uint64 t7;
+    uint64 t8;
+    uint64 t9;
+    uint64 t10;
 };
 
 struct MsgSendInfo {
-    ConnID  connID;
+    ConnID connID;
     int32 log_level;
     uint64 procTime;
     uint8 msgProcFlag;
     char msgType;
     char procMethod;
-    char reserved; // for alignment
+    char reserved;  // for alignment
     uint32 dataSize;
     uint64 data[0];
 };
 
 struct MsgRecvInfo {
-    ConnID  connID;
+    ConnID connID;
     uint8 msgProcFlag;
     uint8 reserved1;
     uint8 reserved2;
     uint8 reserved3;
-    CM_StringInfoData   msg;
+    CM_StringInfoData msg;
     uint64 data[0];
 };
 
+using MsgQueType = std::deque<const char *>;
+using MsgQuePtr = MsgQueType*;
+using ConstMsgQuePtr = const MsgQueType*;
 
-typedef void (*wakeSenderFuncType)(void);
+struct MsgQue {
+    MsgQueType que;
+    CMFairMutex fairLock;
+};
+
+struct PriMsgQues {
+    MsgQue ques[MSG_SRC_COUNT];
+    pthread_mutex_t msgLock;
+    pthread_cond_t msgCond;
+};
+
+typedef void (*wakeSenderFuncType)(const ConnID connID);
 typedef bool (*CanProcThisMsgFunType)(void *threadInfo, const char *msgData);
+void InitMsgQue(PriMsgQues &que);
+size_t getMsgCount(PriMsgQues *priQue);
 
-void pushRecvMsg(const MsgRecvInfo* msg, MsgPriority pri);
-const MsgRecvInfo *getRecvMsg(MsgPriority pri, uint32 waitTime, void *threadInfo);
-void pushSendMsg(const MsgSendInfo *msg, MsgPriority pri);
-const MsgSendInfo *getSendMsg();
-size_t getSendMsgCount();
-bool existSendMsg();
+void pushRecvMsg(PriMsgQues* priQue, MsgRecvInfo* msg, MsgSourceType src);
+const MsgRecvInfo *getRecvMsg(PriMsgQues *priQue, MsgSourceType src, uint32 waitTime, void *threadInfo);
+bool existRecvMsg();
+
+void pushSendMsg(PriMsgQues *priQue, MsgSendInfo *msg, MsgSourceType src);
+const MsgSendInfo *getSendMsg(PriMsgQues *priQue, MsgSourceType src);
+
+bool existSendMsg(const PriMsgQues *priQue);
 void setWakeSenderFunc(wakeSenderFuncType func);
 void SetCanProcThisMsgFun(CanProcThisMsgFunType func);
 
diff --git a/src/include/cm/cm_server/cms_process_messages.h b/src/include/cm/cm_server/cms_process_messages.h
index 0a1e59b..d6395fc 100644
--- a/src/include/cm/cm_server/cms_process_messages.h
+++ b/src/include/cm/cm_server/cms_process_messages.h
@@ -126,16 +126,7 @@ uint32 GetResStatReportInter(uint32 nodeId);
 int GetCurAz();
 uint32 GetPrimaryDnIndex(void);
 status_t InitNodeReportResStatInter();
-MaxClusterResStatus GetResNodeStat(uint32 nodeId);
-
-inline bool CheckEnableFlag()
-{
-    if (IsBoolCmParamTrue(g_enableDcf)) {
-        write_runlog(ERROR, "switchover is not support on dcf mode.\n");
-        return true;
-    }
-    return false;
-}
+MaxClusterResStatus GetResNodeStat(uint32 nodeId, int logLevel);
 
 void ProcessCtlToCmReloadMsg(MsgRecvInfo* recvMsgInfo);
 void ProcessCtlToCmExecDccCmdMsg(MsgRecvInfo* recvMsgInfo, ExecDdbCmdMsg *msg);
diff --git a/src/include/cm/cm_server/cms_threads.h b/src/include/cm/cm_server/cms_threads.h
index adf081d..52bd893 100644
--- a/src/include/cm/cm_server/cms_threads.h
+++ b/src/include/cm/cm_server/cms_threads.h
@@ -30,8 +30,8 @@
 int CM_CreateHA(void);
 int CM_CreateMonitor(void);
 int CM_CreateMonitorStopNode(void);
-int CM_CreateWorkThreadPool(int thrCount);
-int CM_CreateIOThread();
+int CM_CreateWorkThreadPool(uint32 ctlWorkerCount, uint32 agentWorkerCount);
+int CM_CreateIOThreadPool(uint32 thrCount);
 void CreateDnGroupStatusCheckAndArbitrateThread(void);
 void CreateDealGlobalBarrierThread(void);
 
diff --git a/src/include/cm/cm_util.h b/src/include/cm/cm_util.h
index a875f9e..cea1cd4 100644
--- a/src/include/cm/cm_util.h
+++ b/src/include/cm/cm_util.h
@@ -28,27 +28,31 @@
 #include <pthread.h>
 #include "c.h"
 
+const int CM_NSEC_COUNT_PER_MS  = 1000000;
+const int  CM_MS_COUNT_PER_SEC  = 1000;
+
 int CmMkdirP(char *path, unsigned int omode);
 char *gs_getenv_r(const char *name);
 uint64 GetMonotonicTimeMs();
 
-enum class CMMutexPrio {
-    CM_MUTEX_PRIO_NONE,
-    CM_MUTEX_PRIO_NORMAL,
-    CM_MUTEX_PRIO_HIGH,
+enum class CMFairMutexType {
+    CM_MUTEX_NODE,
+    CM_MUTEX_READ,
+    CM_MUTEX_WRITE,
 };
-
-using CMPrioMutex = struct CMPrioMutexSt {
+ 
+using CMFairMutex = struct CMFairMutexSt {
     pthread_mutex_t lock;
     pthread_mutex_t innerLock;
     pthread_cond_t cond;
-    uint32 highPrioCount;
-    CMMutexPrio curPrio;
+    uint32 readerCount;
+    uint32 writerCount;
+    CMFairMutexType curType;
 };
-
-void CMPrioMutexInit(CMPrioMutex &mutex);
-int CMPrioMutexLock(CMPrioMutex &mutex, CMMutexPrio prio);
-void CMPrioMutexUnLock(CMPrioMutex &mutex);
+ 
+void CMFairMutexInit(CMFairMutex &mutex);
+int CMFairMutexLock(CMFairMutex &mutex, CMFairMutexType type);
+void CMFairMutexUnLock(CMFairMutex &mutex);
 char *GetDynamicMem(char *dynamicPtr, size_t *curSize, size_t memSize);
 
 #endif  // CM_UTIL_H