diff --git a/server/core/config.c b/server/core/config.c index f0da45a26..9617104f1 100644 --- a/server/core/config.c +++ b/server/core/config.c @@ -38,6 +38,7 @@ * 09/09/14 Massimiliano Pinto Added localhost_match_wildcard_host parameter * 12/09/14 Mark Riddoch Addition of checks on servers list and * internal router suppression of messages + * 07/11/14 Massimiliano Pinto Addition of monitor timeouts for connect/read/write * * @endverbatim */ @@ -58,6 +59,7 @@ extern int lm_enabled_logfiles_bitmask; +extern int setipaddress(struct in_addr *, char *); static int process_config_context(CONFIG_CONTEXT *); static int process_config_update(CONFIG_CONTEXT *); static void free_config_context(CONFIG_CONTEXT *); @@ -772,6 +774,9 @@ int error_count = 0; unsigned long interval = 0; int replication_heartbeat = 0; int detect_stale_master = 0; + int connect_timeout = 0; + int read_timeout = 0; + int write_timeout = 0; module = config_get_value(obj->parameters, "module"); servers = config_get_value(obj->parameters, "servers"); @@ -789,6 +794,17 @@ int error_count = 0; detect_stale_master = atoi(config_get_value(obj->parameters, "detect_stale_master")); } + if (config_get_value(obj->parameters, "backend_connect_timeout")) { + connect_timeout = atoi(config_get_value(obj->parameters, "backend_connect_timeout")); + } + if (config_get_value(obj->parameters, "backend_read_timeout")) { + read_timeout = atoi(config_get_value(obj->parameters, "backend_read_timeout")); + } + if (config_get_value(obj->parameters, "backend_write_timeout")) { + write_timeout = atoi(config_get_value(obj->parameters, "backend_write_timeout")); + } + + if (module) { obj->element = monitor_alloc(obj->object, module); @@ -816,6 +832,14 @@ int error_count = 0; if(detect_stale_master == 1) monitorDetectStaleMaster(obj->element, detect_stale_master); + /* set timeouts */ + if (connect_timeout > 0) + monitorSetNetworkTimeout(obj->element, MONITOR_CONNECT_TIMEOUT, connect_timeout); + if (read_timeout > 0) + monitorSetNetworkTimeout(obj->element, MONITOR_READ_TIMEOUT, read_timeout); + if (write_timeout > 0) + monitorSetNetworkTimeout(obj->element, MONITOR_WRITE_TIMEOUT, write_timeout); + /* get the servers to monitor */ s = strtok(servers, ","); while (s) @@ -1625,6 +1649,9 @@ static char *monitor_params[] = "monitor_interval", "detect_replication_lag", "detect_stale_master", + "backend_connect_timeout", + "backend_read_timeout", + "backend_write_timeout", NULL }; /** diff --git a/server/core/monitor.c b/server/core/monitor.c index 3fb1cbb6f..03d26e9ca 100644 --- a/server/core/monitor.c +++ b/server/core/monitor.c @@ -26,6 +26,7 @@ * 08/07/13 Mark Riddoch Initial implementation * 23/05/14 Massimiliano Pinto Addition of monitor_interval parameter * and monitor id + * 07/11/14 Massimiliano Pinto Addition of monitor network timeouts * * @endverbatim */ @@ -329,3 +330,17 @@ monitorDetectStaleMaster(MONITOR *mon, int enable) mon->module->detectStaleMaster(mon->handle, enable); } } + +/** + * Set Monitor timeouts for connect/read/write + * + * @param mon The monitor instance + * @param type The timeout handling type + * @param value The timeout to set + */ +void +monitorSetNetworkTimeout(MONITOR *mon, int type, int value) { + if (mon->module->setNetworkTimeout != NULL) { + mon->module->setNetworkTimeout(mon->handle, type, value); + } +} diff --git a/server/include/monitor.h b/server/include/monitor.h index 6123cd614..23a16539d 100644 --- a/server/include/monitor.h +++ b/server/include/monitor.h @@ -33,6 +33,7 @@ * 23/05/14 Massimiliano Pinto Addition of defaultId and setInterval * 23/06/14 Massimiliano Pinto Addition of replicationHeartbeat * 28/08/14 Massimiliano Pinto Addition of detectStaleMaster + * 07/11/14 Massimiliano Pinto Addition of setNetworkTimeout * * @endverbatim */ @@ -70,6 +71,7 @@ typedef struct { void (*defaultUser)(void *, char *, char *); void (*diagnostics)(DCB *, void *); void (*setInterval)(void *, size_t); + void (*setNetworkTimeout)(void *, int, int); void (*defaultId)(void *, unsigned long); void (*replicationHeartbeat)(void *, int); void (*detectStaleMaster)(void *, int); @@ -96,6 +98,16 @@ typedef enum MONITOR_STATE_FREED = 0x08 } monitor_state_t; +/** + * Monitor network timeout types + */ +typedef enum +{ + MONITOR_CONNECT_TIMEOUT = 0, + MONITOR_READ_TIMEOUT = 1, + MONITOR_WRITE_TIMEOUT = 2 +} monitor_timeouts_t; + /** * Representation of the running monitor. */ @@ -123,4 +135,5 @@ extern void monitorSetId(MONITOR *, unsigned long); extern void monitorSetInterval (MONITOR *, unsigned long); extern void monitorSetReplicationHeartbeat(MONITOR *, int); extern void monitorDetectStaleMaster(MONITOR *, int); +extern void monitorSetNetworkTimeout(MONITOR *, int, int); #endif diff --git a/server/modules/monitor/galera_mon.c b/server/modules/monitor/galera_mon.c index ce2900e4a..68091c724 100644 --- a/server/modules/monitor/galera_mon.c +++ b/server/modules/monitor/galera_mon.c @@ -76,10 +76,11 @@ static MONITOR_OBJECT MyObject = { unregisterServer, defaultUsers, diagnostics, - setInterval, - NULL, - NULL, + setInterval, NULL, + NULL, + NULL, + NULL }; /** diff --git a/server/modules/monitor/mm_mon.c b/server/modules/monitor/mm_mon.c new file mode 100644 index 000000000..44b5ccd05 --- /dev/null +++ b/server/modules/monitor/mm_mon.c @@ -0,0 +1,823 @@ +/* + * This file is distributed as part of the MariaDB Corporation MaxScale. It is free + * software: you can redistribute it and/or modify it under the terms of the + * GNU General Public License as published by the Free Software Foundation, + * version 2. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Copyright MariaDB Corporation Ab 2013-2014 + */ + +/** + * @file mysql_mon.c - A MySQL Multi Muster cluster monitor + * + * @verbatim + * Revision History + * + * Date Who Description + * 08/09/14 Massimiliano Pinto Initial implementation + * + * @endverbatim + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +extern int lm_enabled_logfiles_bitmask; + +static void monitorMain(void *); + +static char *version_str = "V1.0.1"; + +MODULE_INFO info = { + MODULE_API_MONITOR, + MODULE_BETA_RELEASE, + MONITOR_VERSION, + "A MySQL Multi Master monitor" +}; + +static void *startMonitor(void *); +static void stopMonitor(void *); +static void registerServer(void *, SERVER *); +static void unregisterServer(void *, SERVER *); +static void defaultUser(void *, char *, char *); +static void diagnostics(DCB *, void *); +static void setInterval(void *, size_t); +static void detectStaleMaster(void *, int); +static bool mon_status_changed(MONITOR_SERVERS* mon_srv); +static bool mon_print_fail_status(MONITOR_SERVERS* mon_srv); +static MONITOR_SERVERS *get_current_master(MYSQL_MONITOR *); +static void monitor_set_pending_status(MONITOR_SERVERS *, int); +static void monitor_clear_pending_status(MONITOR_SERVERS *, int); + +static MONITOR_OBJECT MyObject = { + startMonitor, + stopMonitor, + registerServer, + unregisterServer, + defaultUser, + diagnostics, + setInterval, + NULL, + NULL, + NULL, + detectStaleMaster +}; + +/** + * Implementation of the mandatory version entry point + * + * @return version string of the module + */ +char * +version() +{ + return version_str; +} + +/** + * The module initialisation routine, called when the module + * is first loaded. + */ +void +ModuleInit() +{ + LOGIF(LM, (skygw_log_write( + LOGFILE_MESSAGE, + "Initialise the MySQL Monitor module %s.", + version_str))); +} + +/** + * The module entry point routine. It is this routine that + * must populate the structure that is referred to as the + * "module object", this is a structure with the set of + * external entry points for this module. + * + * @return The module object + */ +MONITOR_OBJECT * +GetModuleObject() +{ + return &MyObject; +} + +/** + * Start the instance of the monitor, returning a handle on the monitor. + * + * This function creates a thread to execute the actual monitoring. + * + * @param arg The current handle - NULL if first start + * @return A handle to use when interacting with the monitor + */ +static void * +startMonitor(void *arg) +{ +MYSQL_MONITOR *handle; + + if (arg) + { + handle = arg; /* Must be a restart */ + handle->shutdown = 0; + } + else + { + if ((handle = (MYSQL_MONITOR *)malloc(sizeof(MYSQL_MONITOR))) == NULL) + return NULL; + handle->databases = NULL; + handle->shutdown = 0; + handle->defaultUser = NULL; + handle->defaultPasswd = NULL; + handle->id = MONITOR_DEFAULT_ID; + handle->interval = MONITOR_INTERVAL; + handle->replicationHeartbeat = 0; + handle->detectStaleMaster = 0; + handle->master = NULL; + spinlock_init(&handle->lock); + } + handle->tid = (THREAD)thread_start(monitorMain, handle); + return handle; +} + +/** + * Stop a running monitor + * + * @param arg Handle on thr running monior + */ +static void +stopMonitor(void *arg) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; + + handle->shutdown = 1; + thread_wait((void *)handle->tid); +} + +/** + * Register a server that must be added to the monitored servers for + * a monitoring module. + * + * @param arg A handle on the running monitor module + * @param server The server to add + */ +static void +registerServer(void *arg, SERVER *server) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; +MONITOR_SERVERS *ptr, *db; + + if ((db = (MONITOR_SERVERS *)malloc(sizeof(MONITOR_SERVERS))) == NULL) + return; + db->server = server; + db->con = NULL; + db->next = NULL; + db->mon_err_count = 0; + db->mon_prev_status = 0; + /* pending status is updated by monitorMain */ + db->pending_status = 0; + + spinlock_acquire(&handle->lock); + + if (handle->databases == NULL) + handle->databases = db; + else + { + ptr = handle->databases; + while (ptr->next != NULL) + ptr = ptr->next; + ptr->next = db; + } + spinlock_release(&handle->lock); +} + +/** + * Remove a server from those being monitored by a monitoring module + * + * @param arg A handle on the running monitor module + * @param server The server to remove + */ +static void +unregisterServer(void *arg, SERVER *server) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; +MONITOR_SERVERS *ptr, *lptr; + + spinlock_acquire(&handle->lock); + if (handle->databases == NULL) + { + spinlock_release(&handle->lock); + return; + } + if (handle->databases->server == server) + { + ptr = handle->databases; + handle->databases = handle->databases->next; + free(ptr); + } + else + { + ptr = handle->databases; + while (ptr->next != NULL && ptr->next->server != server) + ptr = ptr->next; + if (ptr->next) + { + lptr = ptr->next; + ptr->next = ptr->next->next; + free(lptr); + } + } + spinlock_release(&handle->lock); +} + +/** + * Set the default username and password to use to monitor if the server does not + * override this. + * + * @param arg The handle allocated by startMonitor + * @param uname The default user name + * @param passwd The default password + */ +static void +defaultUser(void *arg, char *uname, char *passwd) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; + + if (handle->defaultUser) + free(handle->defaultUser); + if (handle->defaultPasswd) + free(handle->defaultPasswd); + handle->defaultUser = strdup(uname); + handle->defaultPasswd = strdup(passwd); +} + +/** + * Daignostic interface + * + * @param dcb DCB to print diagnostics + * @param arg The monitor handle + */ +static void diagnostics(DCB *dcb, void *arg) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; +MONITOR_SERVERS *db; +char *sep; + + switch (handle->status) + { + case MONITOR_RUNNING: + dcb_printf(dcb, "\tMonitor running\n"); + break; + case MONITOR_STOPPING: + dcb_printf(dcb, "\tMonitor stopping\n"); + break; + case MONITOR_STOPPED: + dcb_printf(dcb, "\tMonitor stopped\n"); + break; + } + + dcb_printf(dcb,"\tSampling interval:\t%lu milliseconds\n", handle->interval); + dcb_printf(dcb,"\tDetect Stale Master:\t%s\n", (handle->detectStaleMaster == 1) ? "enabled" : "disabled"); + dcb_printf(dcb, "\tMonitored servers: "); + + db = handle->databases; + sep = ""; + while (db) + { + dcb_printf(dcb, + "%s%s:%d", + sep, + db->server->name, + db->server->port); + sep = ", "; + db = db->next; + } + dcb_printf(dcb, "\n"); +} + +/** + * Monitor an individual server + * + * @param handle The MySQL Monitor object + * @param database The database to probe + */ +static void +monitorDatabase(MYSQL_MONITOR *handle, MONITOR_SERVERS *database) +{ +MYSQL_ROW row; +MYSQL_RES *result; +int num_fields; +int isslave = 0; +int ismaster = 0; +char *uname = handle->defaultUser; +char *passwd = handle->defaultPasswd; +unsigned long int server_version = 0; +char *server_string; + + if (database->server->monuser != NULL) + { + uname = database->server->monuser; + passwd = database->server->monpw; + } + + if (uname == NULL) + return; + + /* Don't probe servers in maintenance mode */ + if (SERVER_IN_MAINT(database->server)) + return; + + /** Store prevous status */ + database->mon_prev_status = database->server->status; + + if (database->con == NULL || mysql_ping(database->con) != 0) + { + char *dpwd = decryptPassword(passwd); + int rc; + int read_timeout = 1; + + database->con = mysql_init(NULL); + + rc = mysql_options(database->con, MYSQL_OPT_READ_TIMEOUT, (void *)&read_timeout); + + if (mysql_real_connect(database->con, + database->server->name, + uname, + dpwd, + NULL, + database->server->port, + NULL, + 0) == NULL) + { + free(dpwd); + + if (mon_print_fail_status(database)) + { + LOGIF(LE, (skygw_log_write_flush( + LOGFILE_ERROR, + "Error : Monitor was unable to connect to " + "server %s:%d : \"%s\"", + database->server->name, + database->server->port, + mysql_error(database->con)))); + } + + /* The current server is not running + * + * Store server NOT running in server and monitor server pending struct + * + */ + if (mysql_errno(database->con) == ER_ACCESS_DENIED_ERROR) + { + server_set_status(database->server, SERVER_AUTH_ERROR); + monitor_set_pending_status(database, SERVER_AUTH_ERROR); + } + server_clear_status(database->server, SERVER_RUNNING); + monitor_clear_pending_status(database, SERVER_RUNNING); + + /* Also clear M/S state in both server and monitor server pending struct */ + server_clear_status(database->server, SERVER_SLAVE); + server_clear_status(database->server, SERVER_MASTER); + monitor_clear_pending_status(database, SERVER_SLAVE); + monitor_clear_pending_status(database, SERVER_MASTER); + + /* Clean addition status too */ + server_clear_status(database->server, SERVER_STALE_STATUS); + monitor_clear_pending_status(database, SERVER_STALE_STATUS); + + return; + } else { + server_clear_status(database->server, SERVER_AUTH_ERROR); + monitor_clear_pending_status(database, SERVER_AUTH_ERROR); + } + free(dpwd); + } + /* Store current status in both server and monitor server pending struct */ + server_set_status(database->server, SERVER_RUNNING); + monitor_set_pending_status(database, SERVER_RUNNING); + + /* get server version from current server */ + server_version = mysql_get_server_version(database->con); + + /* get server version string */ + server_string = (char *)mysql_get_server_info(database->con); + if (server_string) { + database->server->server_string = realloc(database->server->server_string, strlen(server_string)+1); + if (database->server->server_string) + strcpy(database->server->server_string, server_string); + } + + /* get server_id form current node */ + if (mysql_query(database->con, "SELECT @@server_id") == 0 + && (result = mysql_store_result(database->con)) != NULL) + { + long server_id = -1; + num_fields = mysql_num_fields(result); + while ((row = mysql_fetch_row(result))) + { + server_id = strtol(row[0], NULL, 10); + if ((errno == ERANGE && (server_id == LONG_MAX + || server_id == LONG_MIN)) || (errno != 0 && server_id == 0)) + { + server_id = -1; + } + database->server->node_id = server_id; + } + mysql_free_result(result); + } + + /* Check if the Slave_SQL_Running and Slave_IO_Running status is + * set to Yes + */ + + /* Check first for MariaDB 10.x.x and get status for multimaster replication */ + if (server_version >= 100000) { + + if (mysql_query(database->con, "SHOW ALL SLAVES STATUS") == 0 + && (result = mysql_store_result(database->con)) != NULL) + { + int i = 0; + long master_id = -1; + num_fields = mysql_num_fields(result); + while ((row = mysql_fetch_row(result))) + { + /* get Slave_IO_Running and Slave_SQL_Running values*/ + if (strncmp(row[12], "Yes", 3) == 0 + && strncmp(row[13], "Yes", 3) == 0) { + isslave += 1; + } + + /* If Slave_IO_Running = Yes, assign the master_id to current server: this allows building + * the replication tree, slaves ids will be added to master(s) and we will have at least the + * root master server. + * Please note, there could be no slaves at all if Slave_SQL_Running == 'No' + */ + if (strncmp(row[12], "Yes", 3) == 0) { + /* get Master_Server_Id values */ + master_id = atol(row[41]); + if (master_id == 0) + master_id = -1; + } + + i++; + } + /* store master_id of current node */ + memcpy(&database->server->master_id, &master_id, sizeof(long)); + + mysql_free_result(result); + + /* If all configured slaves are running set this node as slave */ + if (isslave > 0 && isslave == i) + isslave = 1; + else + isslave = 0; + } + } else { + if (mysql_query(database->con, "SHOW SLAVE STATUS") == 0 + && (result = mysql_store_result(database->con)) != NULL) + { + long master_id = -1; + num_fields = mysql_num_fields(result); + while ((row = mysql_fetch_row(result))) + { + /* get Slave_IO_Running and Slave_SQL_Running values*/ + if (strncmp(row[10], "Yes", 3) == 0 + && strncmp(row[11], "Yes", 3) == 0) { + isslave = 1; + } + + /* If Slave_IO_Running = Yes, assign the master_id to current server: this allows building + * the replication tree, slaves ids will be added to master(s) and we will have at least the + * root master server. + * Please note, there could be no slaves at all if Slave_SQL_Running == 'No' + */ + if (strncmp(row[10], "Yes", 3) == 0) { + /* get Master_Server_Id values */ + master_id = atol(row[39]); + if (master_id == 0) + master_id = -1; + } + } + /* store master_id of current node */ + memcpy(&database->server->master_id, &master_id, sizeof(long)); + + mysql_free_result(result); + } + } + + /* get variable 'read_only' set by an external component */ + if (mysql_query(database->con, "SHOW GLOBAL VARIABLES LIKE 'read_only'") == 0 + && (result = mysql_store_result(database->con)) != NULL) + { + num_fields = mysql_num_fields(result); + while ((row = mysql_fetch_row(result))) + { + if (strncasecmp(row[1], "OFF", 3) == 0) { + ismaster = 1; + } + } + mysql_free_result(result); + } + + /* Remove addition info */ + monitor_clear_pending_status(database, SERVER_STALE_STATUS); + + /* Set the Slave Role */ + if (isslave) + { + monitor_set_pending_status(database, SERVER_SLAVE); + /* Avoid any possible stale Master state */ + monitor_clear_pending_status(database, SERVER_MASTER); + + /* Set replication depth to 1 */ + database->server->depth = 1; + } else { + /* Avoid any possible Master/Slave stale state */ + monitor_clear_pending_status(database, SERVER_SLAVE); + monitor_clear_pending_status(database, SERVER_MASTER); + } + + /* Set the Master role */ + if (isslave && ismaster) + { + monitor_clear_pending_status(database, SERVER_SLAVE); + monitor_set_pending_status(database, SERVER_MASTER); + + /* Set replication depth to 0 */ + database->server->depth = 0; + } + +} + +/** + * The entry point for the monitoring module thread + * + * @param arg The handle of the monitor + */ +static void +monitorMain(void *arg) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; +MONITOR_SERVERS *ptr; +int detect_stale_master = handle->detectStaleMaster; +MONITOR_SERVERS *root_master; +size_t nrounds = 0; + + if (mysql_thread_init()) + { + LOGIF(LE, (skygw_log_write_flush( + LOGFILE_ERROR, + "Fatal : mysql_thread_init failed in monitor " + "module. Exiting.\n"))); + return; + } + + handle->status = MONITOR_RUNNING; + while (1) + { + if (handle->shutdown) + { + handle->status = MONITOR_STOPPING; + mysql_thread_end(); + handle->status = MONITOR_STOPPED; + return; + } + + /** Wait base interval */ + thread_millisleep(MON_BASE_INTERVAL_MS); + /** + * Calculate how far away the monitor interval is from its full + * cycle and if monitor interval time further than the base + * interval, then skip monitoring checks. Excluding the first + * round. + */ + if (nrounds != 0 && + ((nrounds*MON_BASE_INTERVAL_MS)%handle->interval) >= + MON_BASE_INTERVAL_MS) + { + nrounds += 1; + continue; + } + nrounds += 1; + + /* start from the first server in the list */ + ptr = handle->databases; + + while (ptr) + { + /* copy server status into monitor pending_status */ + ptr->pending_status = ptr->server->status; + + /* monitor current node */ + monitorDatabase(handle, ptr); + + if (mon_status_changed(ptr)) + { + dcb_call_foreach(DCB_REASON_NOT_RESPONDING); + } + + if (mon_status_changed(ptr) || + mon_print_fail_status(ptr)) + { + LOGIF(LM, (skygw_log_write_flush( + LOGFILE_MESSAGE, + "Backend server %s:%d state : %s", + ptr->server->name, + ptr->server->port, + STRSRVSTATUS(ptr->server)))); + } + if (SERVER_IS_DOWN(ptr->server)) + { + /** Increase this server'e error count */ + ptr->mon_err_count += 1; + } + else + { + /** Reset this server's error count */ + ptr->mon_err_count = 0; + } + + ptr = ptr->next; + } + + /* Get Master server pointer */ + root_master = get_current_master(handle); + + /* Update server status from monitor pending status on that server*/ + + ptr = handle->databases; + while (ptr) + { + if (! SERVER_IN_MAINT(ptr->server)) { + /* If "detect_stale_master" option is On, let's use the previus master */ + if (detect_stale_master && root_master && (!strcmp(ptr->server->name, root_master->server->name) && ptr->server->port == root_master->server->port) && (ptr->server->status & SERVER_MASTER) && !(ptr->pending_status & SERVER_MASTER)) { + /* in this case server->status will not be updated from pending_status */ + LOGIF(LM, (skygw_log_write_flush( + LOGFILE_MESSAGE, "[mysql_mon]: root server [%s:%i] is no longer Master, let's use it again even if it could be a stale master, you have been warned!", ptr->server->name, ptr->server->port))); + /* Set the STALE bit for this server in server struct */ + server_set_status(ptr->server, SERVER_STALE_STATUS); + } else { + ptr->server->status = ptr->pending_status; + } + } + ptr = ptr->next; + } + } +} + +/** + * Set the monitor sampling interval. + * + * @param arg The handle allocated by startMonitor + * @param interval The interval to set in monitor struct, in milliseconds + */ +static void +setInterval(void *arg, size_t interval) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; + memcpy(&handle->interval, &interval, sizeof(unsigned long)); +} + +/** + * Enable/Disable the MySQL Replication Stale Master dectection, allowing a previouvsly detected master to still act as a Master. + * This option must be enabled in order to keep the Master when the replication is stopped or removed from slaves. + * If the replication is still stopped when MaxSclale is restarted no Master will be available. + * + * @param arg The handle allocated by startMonitor + * @param enable To enable it 1, disable it with 0 + */ +static void +detectStaleMaster(void *arg, int enable) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; + memcpy(&handle->detectStaleMaster, &enable, sizeof(int)); +} + +static bool mon_status_changed( + MONITOR_SERVERS* mon_srv) +{ + bool succp; + + if (mon_srv->mon_prev_status != mon_srv->server->status) + { + succp = true; + } + else + { + succp = false; + } + return succp; +} + +static bool mon_print_fail_status( + MONITOR_SERVERS* mon_srv) +{ + bool succp; + int errcount = mon_srv->mon_err_count; + uint8_t modval; + + modval = 1<<(MIN(errcount/10, 7)); + + if (SERVER_IS_DOWN(mon_srv->server) && errcount%modval == 0) + { + succp = true; + } + else + { + succp = false; + } + return succp; +} + +/** + * Set a pending status bit in the monior server + * + * @param server The server to update + * @param bit The bit to clear for the server + */ +static void +monitor_set_pending_status(MONITOR_SERVERS *ptr, int bit) +{ + ptr->pending_status |= bit; +} + +/** + * Clear a pending status bit in the monior server + * + * @param server The server to update + * @param bit The bit to clear for the server + */ +static void +monitor_clear_pending_status(MONITOR_SERVERS *ptr, int bit) +{ + ptr->pending_status &= ~bit; +} + +/******* + * This function returns the master server + * from a set of MySQL Multi Master monitored servers + * and returns the root server (that has SERVER_MASTER bit) + * The server is returned even for servers in 'maintenance' mode. + * + * @param handle The monitor handle + * @return The server at root level with SERVER_MASTER bit + */ + +static MONITOR_SERVERS *get_current_master(MYSQL_MONITOR *handle) { +MONITOR_SERVERS *ptr; + + ptr = handle->databases; + + while (ptr) + { + /* The server could be in SERVER_IN_MAINT + * that means SERVER_IS_RUNNING returns 0 + * Let's check only for SERVER_IS_DOWN: server is not running + */ + if (SERVER_IS_DOWN(ptr->server)) { + ptr = ptr->next; + continue; + } + + if (ptr->server->depth == 0) { + handle->master = ptr; + } + + ptr = ptr->next; + } + + + /* + * Return the root master + */ + + if (handle->master != NULL) { + /* If the root master is in MAINT, return NULL */ + if (SERVER_IN_MAINT(handle->master->server)) { + return NULL; + } else { + return handle->master; + } + } else { + return NULL; + } +} + diff --git a/server/modules/monitor/mysql_mon.c b/server/modules/monitor/mysql_mon.c index 5050f3e85..3dd3fe77c 100644 --- a/server/modules/monitor/mysql_mon.c +++ b/server/modules/monitor/mysql_mon.c @@ -84,6 +84,7 @@ static void setInterval(void *, size_t); static void defaultId(void *, unsigned long); static void replicationHeartbeat(void *, int); static void detectStaleMaster(void *, int); +static void setNetworkTimeout(void *, int, int); static bool mon_status_changed(MONITOR_SERVERS* mon_srv); static bool mon_print_fail_status(MONITOR_SERVERS* mon_srv); static MONITOR_SERVERS *getServerByNodeId(MONITOR_SERVERS *, long); @@ -103,6 +104,7 @@ static MONITOR_OBJECT MyObject = { defaultUser, diagnostics, setInterval, + NULL, defaultId, replicationHeartbeat, detectStaleMaster @@ -1203,3 +1205,15 @@ monitor_clear_pending_status(MONITOR_SERVERS *ptr, int bit) { ptr->pending_status &= ~bit; } + +/** + * Set the default id to use in the monitor. + * + * @param arg The handle allocated by startMonitor + * @param id The id to set in monitor struct + */ +static void +setNetworkTimeout(void *arg, int type, int value) +{ +MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg; +} diff --git a/server/modules/monitor/ndbcluster_mon.c b/server/modules/monitor/ndbcluster_mon.c index 660179ef1..704ca1b5a 100644 --- a/server/modules/monitor/ndbcluster_mon.c +++ b/server/modules/monitor/ndbcluster_mon.c @@ -73,6 +73,7 @@ static MONITOR_OBJECT MyObject = { setInterval, NULL, NULL, + NULL, NULL };