825 lines
23 KiB
C
825 lines
23 KiB
C
/*
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* This file is distributed as part of the MariaDB Corporation MaxScale. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright MariaDB Corporation Ab 2013-2014
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*/
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/**
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* @file mysql_mon.c - A MySQL Multi Muster cluster monitor
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 08/09/14 Massimiliano Pinto Initial implementation
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*
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* @endverbatim
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <monitor.h>
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#include <mysqlmon.h>
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#include <thread.h>
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#include <mysql.h>
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#include <mysqld_error.h>
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#include <skygw_utils.h>
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#include <log_manager.h>
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#include <secrets.h>
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#include <dcb.h>
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#include <modinfo.h>
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extern int lm_enabled_logfiles_bitmask;
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static void monitorMain(void *);
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static char *version_str = "V1.0.1";
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MODULE_INFO info = {
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MODULE_API_MONITOR,
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MODULE_BETA_RELEASE,
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MONITOR_VERSION,
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"A MySQL Multi Master monitor"
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};
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static void *startMonitor(void *);
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static void stopMonitor(void *);
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static void registerServer(void *, SERVER *);
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static void unregisterServer(void *, SERVER *);
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static void defaultUser(void *, char *, char *);
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static void diagnostics(DCB *, void *);
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static void setInterval(void *, size_t);
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static void detectStaleMaster(void *, int);
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static bool mon_status_changed(MONITOR_SERVERS* mon_srv);
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static bool mon_print_fail_status(MONITOR_SERVERS* mon_srv);
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static MONITOR_SERVERS *get_current_master(MYSQL_MONITOR *);
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static void monitor_set_pending_status(MONITOR_SERVERS *, int);
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static void monitor_clear_pending_status(MONITOR_SERVERS *, int);
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static MONITOR_OBJECT MyObject = {
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startMonitor,
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stopMonitor,
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registerServer,
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unregisterServer,
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defaultUser,
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diagnostics,
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setInterval,
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NULL,
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NULL,
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NULL,
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detectStaleMaster,
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NULL
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};
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/**
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* Implementation of the mandatory version entry point
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*
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* @return version string of the module
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*/
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char *
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version()
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{
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return version_str;
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}
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/**
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* The module initialisation routine, called when the module
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* is first loaded.
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*/
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void
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ModuleInit()
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{
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LOGIF(LM, (skygw_log_write(
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LOGFILE_MESSAGE,
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"Initialise the MySQL Monitor module %s.",
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version_str)));
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}
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/**
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* The module entry point routine. It is this routine that
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* must populate the structure that is referred to as the
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* "module object", this is a structure with the set of
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* external entry points for this module.
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*
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* @return The module object
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*/
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MONITOR_OBJECT *
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GetModuleObject()
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{
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return &MyObject;
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}
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/**
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* Start the instance of the monitor, returning a handle on the monitor.
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*
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* This function creates a thread to execute the actual monitoring.
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*
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* @param arg The current handle - NULL if first start
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* @return A handle to use when interacting with the monitor
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*/
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static void *
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startMonitor(void *arg)
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{
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MYSQL_MONITOR *handle;
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if (arg)
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{
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handle = arg; /* Must be a restart */
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handle->shutdown = 0;
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}
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else
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{
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if ((handle = (MYSQL_MONITOR *)malloc(sizeof(MYSQL_MONITOR))) == NULL)
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return NULL;
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handle->databases = NULL;
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handle->shutdown = 0;
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handle->defaultUser = NULL;
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handle->defaultPasswd = NULL;
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handle->id = MONITOR_DEFAULT_ID;
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handle->interval = MONITOR_INTERVAL;
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handle->replicationHeartbeat = 0;
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handle->detectStaleMaster = 0;
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handle->master = NULL;
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spinlock_init(&handle->lock);
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}
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handle->tid = (THREAD)thread_start(monitorMain, handle);
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return handle;
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}
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/**
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* Stop a running monitor
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*
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* @param arg Handle on thr running monior
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*/
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static void
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stopMonitor(void *arg)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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handle->shutdown = 1;
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thread_wait((void *)handle->tid);
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}
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/**
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* Register a server that must be added to the monitored servers for
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* a monitoring module.
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*
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* @param arg A handle on the running monitor module
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* @param server The server to add
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*/
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static void
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registerServer(void *arg, SERVER *server)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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MONITOR_SERVERS *ptr, *db;
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if ((db = (MONITOR_SERVERS *)malloc(sizeof(MONITOR_SERVERS))) == NULL)
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return;
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db->server = server;
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db->con = NULL;
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db->next = NULL;
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db->mon_err_count = 0;
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db->mon_prev_status = 0;
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/* pending status is updated by monitorMain */
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db->pending_status = 0;
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spinlock_acquire(&handle->lock);
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if (handle->databases == NULL)
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handle->databases = db;
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else
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{
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ptr = handle->databases;
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while (ptr->next != NULL)
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ptr = ptr->next;
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ptr->next = db;
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}
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spinlock_release(&handle->lock);
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}
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/**
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* Remove a server from those being monitored by a monitoring module
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*
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* @param arg A handle on the running monitor module
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* @param server The server to remove
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*/
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static void
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unregisterServer(void *arg, SERVER *server)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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MONITOR_SERVERS *ptr, *lptr;
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spinlock_acquire(&handle->lock);
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if (handle->databases == NULL)
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{
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spinlock_release(&handle->lock);
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return;
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}
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if (handle->databases->server == server)
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{
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ptr = handle->databases;
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handle->databases = handle->databases->next;
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free(ptr);
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}
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else
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{
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ptr = handle->databases;
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while (ptr->next != NULL && ptr->next->server != server)
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ptr = ptr->next;
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if (ptr->next)
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{
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lptr = ptr->next;
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ptr->next = ptr->next->next;
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free(lptr);
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}
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}
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spinlock_release(&handle->lock);
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}
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/**
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* Set the default username and password to use to monitor if the server does not
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* override this.
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*
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* @param arg The handle allocated by startMonitor
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* @param uname The default user name
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* @param passwd The default password
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*/
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static void
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defaultUser(void *arg, char *uname, char *passwd)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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if (handle->defaultUser)
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free(handle->defaultUser);
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if (handle->defaultPasswd)
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free(handle->defaultPasswd);
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handle->defaultUser = strdup(uname);
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handle->defaultPasswd = strdup(passwd);
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}
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/**
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* Daignostic interface
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*
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* @param dcb DCB to print diagnostics
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* @param arg The monitor handle
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*/
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static void diagnostics(DCB *dcb, void *arg)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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MONITOR_SERVERS *db;
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char *sep;
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switch (handle->status)
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{
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case MONITOR_RUNNING:
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dcb_printf(dcb, "\tMonitor running\n");
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break;
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case MONITOR_STOPPING:
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dcb_printf(dcb, "\tMonitor stopping\n");
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break;
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case MONITOR_STOPPED:
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dcb_printf(dcb, "\tMonitor stopped\n");
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break;
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}
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dcb_printf(dcb,"\tSampling interval:\t%lu milliseconds\n", handle->interval);
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dcb_printf(dcb,"\tDetect Stale Master:\t%s\n", (handle->detectStaleMaster == 1) ? "enabled" : "disabled");
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dcb_printf(dcb, "\tMonitored servers: ");
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db = handle->databases;
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sep = "";
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while (db)
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{
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dcb_printf(dcb,
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"%s%s:%d",
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sep,
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db->server->name,
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db->server->port);
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sep = ", ";
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db = db->next;
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}
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dcb_printf(dcb, "\n");
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}
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/**
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* Monitor an individual server
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*
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* @param handle The MySQL Monitor object
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* @param database The database to probe
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*/
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static void
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monitorDatabase(MYSQL_MONITOR *handle, MONITOR_SERVERS *database)
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{
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MYSQL_ROW row;
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MYSQL_RES *result;
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int num_fields;
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int isslave = 0;
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int ismaster = 0;
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char *uname = handle->defaultUser;
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char *passwd = handle->defaultPasswd;
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unsigned long int server_version = 0;
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char *server_string;
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if (database->server->monuser != NULL)
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{
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uname = database->server->monuser;
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passwd = database->server->monpw;
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}
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if (uname == NULL)
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return;
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/* Don't probe servers in maintenance mode */
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if (SERVER_IN_MAINT(database->server))
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return;
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/** Store prevous status */
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database->mon_prev_status = database->server->status;
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if (database->con == NULL || mysql_ping(database->con) != 0)
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{
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char *dpwd = decryptPassword(passwd);
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int rc;
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int read_timeout = 1;
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database->con = mysql_init(NULL);
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rc = mysql_options(database->con, MYSQL_OPT_READ_TIMEOUT, (void *)&read_timeout);
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if (mysql_real_connect(database->con,
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database->server->name,
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uname,
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dpwd,
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NULL,
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database->server->port,
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NULL,
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0) == NULL)
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{
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free(dpwd);
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if (mon_print_fail_status(database))
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{
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Monitor was unable to connect to "
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"server %s:%d : \"%s\"",
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database->server->name,
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database->server->port,
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mysql_error(database->con))));
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}
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/* The current server is not running
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*
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* Store server NOT running in server and monitor server pending struct
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*
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*/
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if (mysql_errno(database->con) == ER_ACCESS_DENIED_ERROR)
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{
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server_set_status(database->server, SERVER_AUTH_ERROR);
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monitor_set_pending_status(database, SERVER_AUTH_ERROR);
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}
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server_clear_status(database->server, SERVER_RUNNING);
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monitor_clear_pending_status(database, SERVER_RUNNING);
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/* Also clear M/S state in both server and monitor server pending struct */
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server_clear_status(database->server, SERVER_SLAVE);
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server_clear_status(database->server, SERVER_MASTER);
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monitor_clear_pending_status(database, SERVER_SLAVE);
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monitor_clear_pending_status(database, SERVER_MASTER);
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/* Clean addition status too */
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server_clear_status(database->server, SERVER_STALE_STATUS);
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monitor_clear_pending_status(database, SERVER_STALE_STATUS);
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return;
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} else {
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server_clear_status(database->server, SERVER_AUTH_ERROR);
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monitor_clear_pending_status(database, SERVER_AUTH_ERROR);
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}
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free(dpwd);
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}
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/* Store current status in both server and monitor server pending struct */
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server_set_status(database->server, SERVER_RUNNING);
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monitor_set_pending_status(database, SERVER_RUNNING);
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/* get server version from current server */
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server_version = mysql_get_server_version(database->con);
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/* get server version string */
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server_string = (char *)mysql_get_server_info(database->con);
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if (server_string) {
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database->server->server_string = realloc(database->server->server_string, strlen(server_string)+1);
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if (database->server->server_string)
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strcpy(database->server->server_string, server_string);
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}
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/* get server_id form current node */
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if (mysql_query(database->con, "SELECT @@server_id") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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long server_id = -1;
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num_fields = mysql_num_fields(result);
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while ((row = mysql_fetch_row(result)))
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{
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server_id = strtol(row[0], NULL, 10);
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if ((errno == ERANGE && (server_id == LONG_MAX
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|| server_id == LONG_MIN)) || (errno != 0 && server_id == 0))
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{
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server_id = -1;
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}
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database->server->node_id = server_id;
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}
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mysql_free_result(result);
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}
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/* Check if the Slave_SQL_Running and Slave_IO_Running status is
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* set to Yes
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*/
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/* Check first for MariaDB 10.x.x and get status for multimaster replication */
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if (server_version >= 100000) {
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if (mysql_query(database->con, "SHOW ALL SLAVES STATUS") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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int i = 0;
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long master_id = -1;
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num_fields = mysql_num_fields(result);
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while ((row = mysql_fetch_row(result)))
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{
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/* get Slave_IO_Running and Slave_SQL_Running values*/
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if (strncmp(row[12], "Yes", 3) == 0
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&& strncmp(row[13], "Yes", 3) == 0) {
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isslave += 1;
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}
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/* If Slave_IO_Running = Yes, assign the master_id to current server: this allows building
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* the replication tree, slaves ids will be added to master(s) and we will have at least the
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* root master server.
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* Please note, there could be no slaves at all if Slave_SQL_Running == 'No'
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*/
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if (strncmp(row[12], "Yes", 3) == 0) {
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/* get Master_Server_Id values */
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master_id = atol(row[41]);
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if (master_id == 0)
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master_id = -1;
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}
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i++;
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}
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/* store master_id of current node */
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memcpy(&database->server->master_id, &master_id, sizeof(long));
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mysql_free_result(result);
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/* If all configured slaves are running set this node as slave */
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if (isslave > 0 && isslave == i)
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isslave = 1;
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else
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isslave = 0;
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}
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} else {
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if (mysql_query(database->con, "SHOW SLAVE STATUS") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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long master_id = -1;
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num_fields = mysql_num_fields(result);
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while ((row = mysql_fetch_row(result)))
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{
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/* get Slave_IO_Running and Slave_SQL_Running values*/
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if (strncmp(row[10], "Yes", 3) == 0
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&& strncmp(row[11], "Yes", 3) == 0) {
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isslave = 1;
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}
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/* If Slave_IO_Running = Yes, assign the master_id to current server: this allows building
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* the replication tree, slaves ids will be added to master(s) and we will have at least the
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* root master server.
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* Please note, there could be no slaves at all if Slave_SQL_Running == 'No'
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*/
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if (strncmp(row[10], "Yes", 3) == 0) {
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/* get Master_Server_Id values */
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master_id = atol(row[39]);
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if (master_id == 0)
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master_id = -1;
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}
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}
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/* store master_id of current node */
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memcpy(&database->server->master_id, &master_id, sizeof(long));
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mysql_free_result(result);
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}
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}
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/* get variable 'read_only' set by an external component */
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if (mysql_query(database->con, "SHOW GLOBAL VARIABLES LIKE 'read_only'") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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num_fields = mysql_num_fields(result);
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while ((row = mysql_fetch_row(result)))
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{
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if (strncasecmp(row[1], "OFF", 3) == 0) {
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ismaster = 1;
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}
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}
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mysql_free_result(result);
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}
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/* Remove addition info */
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monitor_clear_pending_status(database, SERVER_STALE_STATUS);
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/* Set the Slave Role */
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if (isslave)
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{
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monitor_set_pending_status(database, SERVER_SLAVE);
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/* 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(LD, (skygw_log_write_flush(
|
|
LOGFILE_DEBUG,
|
|
"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;
|
|
}
|
|
}
|
|
|