diff --git a/include/MySQL_HostGroups_Manager.h b/include/MySQL_HostGroups_Manager.h index 83abc5c05a..7195ad6e55 100644 --- a/include/MySQL_HostGroups_Manager.h +++ b/include/MySQL_HostGroups_Manager.h @@ -203,6 +203,7 @@ class MySrvC { // MySQL Server Container unsigned int max_connections_used; // The maximum number of connections that has been opened unsigned int connect_OK; unsigned int connect_ERR; + int cur_replication_lag; unsigned int cur_replication_lag_count; // note that these variables are in microsecond, while user defines max latency in millisecond unsigned int current_latency_us; diff --git a/include/MySQL_Thread.h b/include/MySQL_Thread.h index 721926ee0d..316d4e459c 100644 --- a/include/MySQL_Thread.h +++ b/include/MySQL_Thread.h @@ -548,6 +548,7 @@ class MySQL_Threads_Handler bool log_mysql_warnings_enabled; int data_packets_history_size; int handle_warnings; + int evaluate_replication_lag_on_servers_load; } variables; struct { unsigned int mirror_sessions_current; diff --git a/include/proxysql_structs.h b/include/proxysql_structs.h index 97080cad67..86141a9178 100644 --- a/include/proxysql_structs.h +++ b/include/proxysql_structs.h @@ -866,6 +866,7 @@ __thread bool mysql_thread___enable_load_data_local_infile; __thread int mysql_thread___client_host_cache_size; __thread int mysql_thread___client_host_error_counts; __thread int mysql_thread___handle_warnings; +__thread int mysql_thread___evaluate_replication_lag_on_servers_load; /* variables used for Query Cache */ __thread int mysql_thread___query_cache_size_MB; @@ -1034,6 +1035,7 @@ extern __thread bool mysql_thread___enable_load_data_local_infile; extern __thread int mysql_thread___client_host_cache_size; extern __thread int mysql_thread___client_host_error_counts; extern __thread int mysql_thread___handle_warnings; +extern __thread int mysql_thread___evaluate_replication_lag_on_servers_load; /* variables used for Query Cache */ extern __thread int mysql_thread___query_cache_size_MB; diff --git a/lib/MySQL_HostGroups_Manager.cpp b/lib/MySQL_HostGroups_Manager.cpp index e957e0f1dd..e41b45b1b8 100644 --- a/lib/MySQL_HostGroups_Manager.cpp +++ b/lib/MySQL_HostGroups_Manager.cpp @@ -745,6 +745,7 @@ MySrvC::MySrvC( max_connections=_max_connections; max_replication_lag=_max_replication_lag; use_ssl=_use_ssl; + cur_replication_lag=0; cur_replication_lag_count=0; max_latency_us=_max_latency_ms*1000; current_latency_us=0; @@ -2026,9 +2027,25 @@ bool MySQL_HostGroups_Manager::commit( mysrvc->weight=atoi(r->fields[14]); } if (atoi(r->fields[5])!=atoi(r->fields[15])) { - if (GloMTH->variables.hostgroup_manager_verbose) - proxy_info("Changing status for server %d:%s:%d (%s:%d) from %d (%d) to %d\n" , mysrvc->myhgc->hid , mysrvc->address, mysrvc->port, r->fields[1], atoi(r->fields[2]), atoi(r->fields[5]) , mysrvc->status , atoi(r->fields[15])); - mysrvc->status=(MySerStatus)atoi(r->fields[15]); + bool change_server_status = true; + if (GloMTH->variables.evaluate_replication_lag_on_servers_load == 1) { + if (mysrvc->status == MYSQL_SERVER_STATUS_SHUNNED_REPLICATION_LAG && // currently server is shunned due to replication lag + (MySerStatus)atoi(r->fields[15]) == MYSQL_SERVER_STATUS_ONLINE) { // new server status is online + if (mysrvc->cur_replication_lag != -2) { // Master server? Seconds_Behind_Master column is not present + const unsigned int new_max_repl_lag = atoi(r->fields[18]); + if (mysrvc->cur_replication_lag < 0 || + (new_max_repl_lag > 0 && + ((unsigned int)mysrvc->cur_replication_lag > new_max_repl_lag))) { // we check if current replication lag is greater than new max_replication_lag + change_server_status = false; + } + } + } + } + if (change_server_status == true) { + if (GloMTH->variables.hostgroup_manager_verbose) + proxy_info("Changing status for server %d:%s:%d (%s:%d) from %d (%d) to %d\n", mysrvc->myhgc->hid, mysrvc->address, mysrvc->port, r->fields[1], atoi(r->fields[2]), atoi(r->fields[5]), mysrvc->status, atoi(r->fields[15])); + mysrvc->status = (MySerStatus)atoi(r->fields[15]); + } if (mysrvc->status==MYSQL_SERVER_STATUS_SHUNNED) { mysrvc->shunned_automatic=false; } @@ -3669,6 +3686,7 @@ void MySQL_HostGroups_Manager::replication_lag_action_inner(MyHGC *myhgc, const for (j=0; j<(int)myhgc->mysrvs->cnt(); j++) { MySrvC *mysrvc=(MySrvC *)myhgc->mysrvs->servers->index(j); if (strcmp(mysrvc->address,address)==0 && mysrvc->port==port) { + mysrvc->cur_replication_lag = current_replication_lag; if (mysrvc->status==MYSQL_SERVER_STATUS_ONLINE) { if ( // (current_replication_lag==-1 ) diff --git a/lib/MySQL_Thread.cpp b/lib/MySQL_Thread.cpp index ff84dc024a..2ae7d6cc94 100644 --- a/lib/MySQL_Thread.cpp +++ b/lib/MySQL_Thread.cpp @@ -432,6 +432,7 @@ static char * mysql_thread_variables_names[]= { (char *)"query_cache_stores_empty_result", (char *)"data_packets_history_size", (char *)"handle_warnings", + (char *)"evaluate_replication_lag_on_servers_load", NULL }; @@ -896,6 +897,7 @@ MySQL_Threads_Handler::MySQL_Threads_Handler() { variables.client_host_cache_size=0; variables.client_host_error_counts=0; variables.handle_warnings=1; + variables.evaluate_replication_lag_on_servers_load=1; variables.connect_retries_on_failure=10; variables.connection_delay_multiplex_ms=0; variables.connection_max_age_ms=0; @@ -2083,6 +2085,7 @@ char ** MySQL_Threads_Handler::get_variables_list() { VariablesPointers_int["client_host_cache_size"] = make_tuple(&variables.client_host_cache_size, 0, 1024*1024, false); VariablesPointers_int["client_host_error_counts"] = make_tuple(&variables.client_host_error_counts, 0, 1024*1024, false); VariablesPointers_int["handle_warnings"] = make_tuple(&variables.handle_warnings, 0, 1, false); + VariablesPointers_int["evaluate_replication_lag_on_servers_load"] = make_tuple(&variables.evaluate_replication_lag_on_servers_load, 0, 1, false); // logs VariablesPointers_int["auditlog_filesize"] = make_tuple(&variables.auditlog_filesize, 1024*1024, 1*1024*1024*1024, false); @@ -4011,6 +4014,7 @@ void MySQL_Thread::refresh_variables() { mysql_thread___client_host_cache_size=GloMTH->get_variable_int((char *)"client_host_cache_size"); mysql_thread___client_host_error_counts=GloMTH->get_variable_int((char *)"client_host_error_counts"); mysql_thread___handle_warnings=GloMTH->get_variable_int((char*)"handle_warnings"); + mysql_thread___evaluate_replication_lag_on_servers_load=GloMTH->get_variable_int((char*)"evaluate_replication_lag_on_servers_load"); #ifdef DEBUG mysql_thread___session_debug=(bool)GloMTH->get_variable_int((char *)"session_debug"); #endif /* DEBUG */