diff --git a/deps/oblib/src/rpc/obmysql/ob_sql_nio.cpp b/deps/oblib/src/rpc/obmysql/ob_sql_nio.cpp
index 48990e9b47..9698830ced 100644
--- a/deps/oblib/src/rpc/obmysql/ob_sql_nio.cpp
+++ b/deps/oblib/src/rpc/obmysql/ob_sql_nio.cpp
@@ -735,21 +735,18 @@ public:
     tcp_keepintvl_ = tcp_keepintvl;
     tcp_keepcnt_ = tcp_keepcnt;
   }
-  void close_all_fd() {
-    if (lfd_ > 0) {
-      IGNORE_RETURN epoll_ctl(epfd_, EPOLL_CTL_DEL, lfd_, NULL);
-      close(lfd_);
-      lfd_ = -1;
-    }
+  void close_all() {
     ObDLink* head = all_list_.head();
     ObLink* cur = head->next_;
     while (cur != head) {
       ObSqlSock* s = CONTAINER_OF(cur, ObSqlSock, all_list_link_);
       cur = cur->next_;
-      s->on_disconnect();
-      ObSqlSockSession *sess = (ObSqlSockSession *)s->sess_;
-      sess->destroy();
-      s->do_close();
+      prepare_destroy(s);
+    }
+    while(head->next_ != head) {
+      handle_write_req_queue();
+      handle_close_req_queue();
+      handle_pending_destroy_list();
     }
   }
 private:
@@ -1065,7 +1062,7 @@ void ObSqlNio::run(int64_t idx)
       impl_[idx].do_work();
     }
     if (has_set_stop()) {
-      impl_[idx].close_all_fd();
+      impl_[idx].close_all();
     }
   }
 }
diff --git a/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.cpp b/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.cpp
index c9d8e5a640..6cd26f3273 100644
--- a/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.cpp
+++ b/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.cpp
@@ -190,6 +190,21 @@ int ObPocRpcServer::start(int port, int net_thread_count, frame::ObReqDeliver* d
   }
   return ret;
 }
+
+void ObPocRpcServer::stop()
+{
+  for (uint64_t gid = 1; gid < END_GROUP; gid++) {
+    pn_stop(gid);
+  }
+}
+
+void ObPocRpcServer::wait()
+{
+  for (uint64_t gid = 1; gid < END_GROUP; gid++) {
+    pn_wait(gid);
+  }
+}
+
 int ObPocRpcServer::update_tcp_keepalive_params(int64_t user_timeout) {
   int ret = OB_SUCCESS;
   if (pn_set_keepalive_timeout(user_timeout) != user_timeout) {
diff --git a/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.h b/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.h
index eecf8dba6f..843ce0b255 100644
--- a/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.h
+++ b/deps/oblib/src/rpc/obrpc/ob_poc_rpc_server.h
@@ -51,12 +51,14 @@ class ObPocRpcServer
 public:
   enum {
     DEFAULT_PNIO_GROUP = 1,
-    RATELIMIT_PNIO_GROUP = 2
+    RATELIMIT_PNIO_GROUP = 2,
+    END_GROUP
   };
   ObPocRpcServer() : has_start_(false){}
   ~ObPocRpcServer() {}
   int start(int port, int net_thread_count, rpc::frame::ObReqDeliver* deliver);
-  void stop() {}
+  void stop();
+  void wait();
   bool has_start() {return has_start_;}
   int update_tcp_keepalive_params(int64_t user_timeout);
   int update_server_standby_fetch_log_bandwidth_limit(int64_t value);
diff --git a/deps/oblib/src/rpc/pnio/interface/group.c b/deps/oblib/src/rpc/pnio/interface/group.c
index f458a2a2f9..c967b72ffc 100644
--- a/deps/oblib/src/rpc/pnio/interface/group.c
+++ b/deps/oblib/src/rpc/pnio/interface/group.c
@@ -223,6 +223,7 @@ static pn_t* pn_create(int listen_id, int gid, int tid)
     cfifo_alloc_init(&pn->server_resp_alloc, &pn->server_resp_chunk_alloc);
     cfifo_alloc_init(&pn->client_req_alloc, &pn->client_req_chunk_alloc);
     cfifo_alloc_init(&pn->client_cb_alloc, &pn->client_cb_chunk_alloc);
+    pn->is_stop_ = false;
   }
   if (0 != err && NULL != pn) {
     pn_destroy(pn);
@@ -396,6 +397,24 @@ PN_API int pn_send(uint64_t gtid, struct sockaddr_in* addr, const char* buf, int
   return err;
 }
 
+PN_API void pn_stop(uint64_t gid)
+{
+  pn_grp_t *pgrp = locate_grp(gid);
+  for (int tid = 0; tid < pgrp->count; tid++) {
+    pn_t *pn = get_pn_for_send(pgrp, tid);
+    ATOMIC_STORE(&pn->is_stop_, true);
+  }
+}
+
+PN_API void pn_wait(uint64_t gid)
+{
+  pn_grp_t *pgrp = locate_grp(gid);
+  for (int tid = 0; tid < pgrp->count; tid++) {
+    pn_t *pn = get_pn_for_send(pgrp, tid);
+    pthread_join(pn->pd, NULL);
+  }
+}
+
 typedef struct pn_resp_ctx_t
 {
   pn_t* pn;
diff --git a/deps/oblib/src/rpc/pnio/interface/group.h b/deps/oblib/src/rpc/pnio/interface/group.h
index f2ab9c9fbe..3dd4f2d3c3 100644
--- a/deps/oblib/src/rpc/pnio/interface/group.h
+++ b/deps/oblib/src/rpc/pnio/interface/group.h
@@ -38,6 +38,7 @@ typedef struct pn_grp_comm_t
 } pn_grp_comm_t;
 
 #define PN_COMM                \
+  bool is_stop_;               \
   pthread_t pd;                \
   int accept_qfd;              \
   int gid;                     \
@@ -62,6 +63,8 @@ PN_API int pn_ratelimit(int grp_id, int64_t value);
 PN_API int64_t pn_get_ratelimit(int grp_id);
 PN_API uint64_t pn_get_rxbytes(int grp_id);
 PN_API int dispatch_accept_fd_to_certain_group(int fd, uint64_t gid);
+PN_API void pn_stop(uint64_t gid);
+PN_API void pn_wait(uint64_t gid);
 extern int64_t pnio_keepalive_timeout;
 pn_comm_t* get_current_pnio();
 
diff --git a/deps/oblib/src/rpc/pnio/io/eloop.c b/deps/oblib/src/rpc/pnio/io/eloop.c
index 780c631535..6b312e076b 100644
--- a/deps/oblib/src/rpc/pnio/io/eloop.c
+++ b/deps/oblib/src/rpc/pnio/io/eloop.c
@@ -102,7 +102,8 @@ int eloop_thread_run(eloop_t** udata) {
 }
 
 int eloop_run(eloop_t* ep) {
-  while(true) {
+  pn_comm_t* pn = get_current_pnio();
+  while(!ATOMIC_LOAD(&pn->is_stop_)) {
     int64_t epoll_timeout = 1000;
     ob_update_loop_ts();
     if (ep->ready_link.next != &ep->ready_link) {
@@ -116,7 +117,6 @@ int eloop_run(eloop_t* ep) {
     }
 
     PNIO_DELAY_WARN(eloop_delay_warn(start_us, ELOOP_WARN_US));
-    pn_comm_t* pn = get_current_pnio();
     if (unlikely(NULL != pn && 0 == pn->tid && PNIO_REACH_TIME_INTERVAL(1000000))) {
       static __thread uint64_t last_rx_bytes = 0;
       static __thread uint64_t last_time = 0;
diff --git a/src/observer/main.cpp b/src/observer/main.cpp
index 7b80bdb811..17d6fe18ca 100644
--- a/src/observer/main.cpp
+++ b/src/observer/main.cpp
@@ -396,6 +396,39 @@ static int check_uid_before_start(const char *dir_path)
 
   return ret;
 }
+
+static void print_all_thread(const char* desc)
+{
+  MPRINT("============= [%s]begin to show unstopped thread =============", desc);
+  DIR *dir = opendir("/proc/self/task");
+  if (dir == NULL) {
+    MPRINT("fail to print all thread");
+  } else {
+    struct dirent *entry;
+    while ((entry = readdir(dir)) != NULL) {
+      char *tid = entry->d_name;
+      if (tid[0] == '.')
+        continue;  // pass . and ..
+      char path[256];
+      sprintf(path, "/proc/self/task/%s/comm", tid);
+      FILE *file = fopen(path, "r");
+      if (file == NULL) {
+        MPRINT("fail to print thread tid: %s", tid);
+      }
+      char name[256];
+      fgets(name, 256, file);
+      size_t len = strlen(name);
+      if (len > 0 && name[len - 1] == '\n') {
+        name[len - 1] = '\0';
+      }
+      MPRINT("tid: %s, name: %s", tid, name);
+      fclose(file);
+    }
+  }
+  closedir(dir);
+  MPRINT("============= [%s]finish to show unstopped thread =============", desc);
+}
+
 extern "C" {
 typedef void *(*reasy_pool_realloc_pt)(void *ptr, size_t size);
 void reasy_pool_set_allocator(reasy_pool_realloc_pt alloc);
@@ -551,6 +584,7 @@ int main(int argc, char *argv[])
       } else if (OB_FAIL(observer.wait())) {
         LOG_ERROR("observer wait fail", K(ret));
       }
+      print_all_thread("BEFORE_DESTORY");
       observer.destroy();
       ObKVGlobalCache::get_instance().destroy();
       ObVirtualTenantManager::get_instance().destroy();
@@ -563,5 +597,6 @@ int main(int argc, char *argv[])
   OB_LOGGER.set_stop_append_log();
   OB_LOGGER.set_enable_async_log(false);
   OB_LOGGER.set_enable_log_limit(false);
+  print_all_thread("AFTER_DESTORY");
   return ret;
 }
diff --git a/src/observer/ob_server.cpp b/src/observer/ob_server.cpp
index 773dc4f521..19ff1a604e 100644
--- a/src/observer/ob_server.cpp
+++ b/src/observer/ob_server.cpp
@@ -1200,6 +1200,10 @@ int ObServer::stop()
   }
 
 
+  FLOG_INFO("begin to stop global_poc_server");
+  obrpc::global_poc_server.stop();
+  FLOG_INFO("stop global_poc_server success");
+
   has_stopped_ = true;
   FLOG_INFO("[OBSERVER_NOTICE] stop observer end", KR(ret));
   if (OB_SUCCESS != fail_ret) {
@@ -1390,6 +1394,11 @@ int ObServer::wait()
       LOG_DBA_ERROR(OB_ERR_OBSERVER_STOP, "msg", "observer wait() has failure", KR(fail_ret));
     }
   }
+
+  FLOG_INFO("begin to wait global_poc_server");
+  obrpc::global_poc_server.wait();
+  FLOG_INFO("wait global_poc_server success");
+
   return ret;
 }