7ef8b187b5
The hangup code was refactored into a common function which should only be used after the server states have been updated. This will remove erroneus connections to already failed servers.
789 lines
23 KiB
C
789 lines
23 KiB
C
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file mm_mon.c - A Multi-Master 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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* 08/05/15 Markus Makela Addition of launchable scripts
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* 17/10/15 Martin Brampton Change DCB callback to hangup
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*
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* @endverbatim
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*/
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#include <mmmon.h>
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#include <dcb.h>
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static void monitorMain(void *);
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static char *version_str = "V1.1.1";
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/* @see function load_module in load_utils.c for explanation of the following
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* lint directives.
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*/
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/*lint -e14 */
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MODULE_INFO info =
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{
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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 Multi-Master Multi Master monitor"
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};
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/*lint +e14 */
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static void *startMonitor(void *, void*);
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static void stopMonitor(void *);
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static void diagnostics(DCB *, void *);
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static void detectStaleMaster(void *, int);
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static MONITOR_SERVERS *get_current_master(MONITOR *);
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static bool isMySQLEvent(monitor_event_t event);
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static MONITOR_OBJECT MyObject =
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{
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startMonitor,
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stopMonitor,
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diagnostics
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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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* @see function load_module in load_utils.c for explanation of the following
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* lint directives.
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*/
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/*lint -e14 */
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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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MXS_NOTICE("Initialise the Multi-Master Monitor module %s.", 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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/*lint +e14 */
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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, void* opt)
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{
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MONITOR* mon = (MONITOR*) arg;
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MM_MONITOR *handle = mon->handle;
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CONFIG_PARAMETER* params = (CONFIG_PARAMETER*) opt;
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bool have_events = false, script_error = false;
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if (handle)
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{
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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 = (MM_MONITOR *) malloc(sizeof(MM_MONITOR))) == NULL)
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{
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return NULL;
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}
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handle->shutdown = 0;
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handle->id = MONITOR_DEFAULT_ID;
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handle->master = NULL;
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handle->script = NULL;
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handle->detectStaleMaster = false;
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memset(handle->events, false, sizeof(handle->events));
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spinlock_init(&handle->lock);
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}
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while (params)
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{
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if (!strcmp(params->name, "detect_stale_master"))
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{
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handle->detectStaleMaster = config_truth_value(params->value);
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}
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else if (!strcmp(params->name, "script"))
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{
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if (externcmd_can_execute(params->value))
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{
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free(handle->script);
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handle->script = strdup(params->value);
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}
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else
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{
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script_error = true;
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}
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}
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else if (!strcmp(params->name, "events"))
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{
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if (mon_parse_event_string((bool *)handle->events,
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sizeof(handle->events), params->value) != 0)
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{
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script_error = true;
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}
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else
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{
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have_events = true;
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}
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}
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params = params->next;
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}
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if (!check_monitor_permissions(mon, "SHOW SLAVE STATUS"))
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{
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MXS_ERROR("Failed to start monitor. See earlier errors for more information.");
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free(handle->script);
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free(handle);
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return NULL;
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}
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if (script_error)
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{
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MXS_ERROR("Errors were found in the script configuration parameters "
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"for the monitor '%s'. The script will not be used.", mon->name);
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free(handle->script);
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handle->script = NULL;
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}
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/** If no specific events are given, enable them all */
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if (!have_events)
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{
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memset(handle->events, true, sizeof(handle->events));
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}
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if (thread_start(&handle->thread, monitorMain, mon) == NULL)
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{
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MXS_ERROR("Failed to start monitor thread for monitor '%s'.", mon->name);
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}
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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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MONITOR* mon = arg;
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MM_MONITOR *handle = (MM_MONITOR *) mon->handle;
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handle->shutdown = 1;
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thread_wait(handle->thread);
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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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MONITOR* mon = (MONITOR*) arg;
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MM_MONITOR *handle = (MM_MONITOR *) mon->handle;
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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", mon->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 = mon->databases;
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sep = "";
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while (db)
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{
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dcb_printf(dcb, "%s%s:%d", sep, db->server->name, 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(MONITOR* mon, 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 isslave = 0;
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int ismaster = 0;
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unsigned long int server_version = 0;
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char *server_string;
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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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{
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return;
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}
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/** Store previous status */
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database->mon_prev_status = database->server->status;
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connect_result_t rval = mon_connect_to_db(mon, database);
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if (rval != MONITOR_CONN_OK)
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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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if (mon_status_changed(database) && mon_print_fail_status(database))
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{
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mon_log_connect_error(database, rval);
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}
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return;
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}
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else
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{
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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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/* 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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{
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server_set_version_string(database->server, 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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if (mysql_field_count(database->con) != 1)
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{
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mysql_free_result(result);
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MXS_ERROR("Unexpected result for 'SELECT @@server_id'. Expected 1 column."
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" MySQL Version: %s", version_str);
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return;
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}
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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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{
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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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if (mysql_field_count(database->con) < 42)
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{
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mysql_free_result(result);
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MXS_ERROR("\"SHOW ALL SLAVES STATUS\" returned less than the expected"
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" amount of columns. Expected 42 columns MySQL Version: %s",
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version_str);
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return;
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}
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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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{
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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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{
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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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{
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master_id = -1;
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}
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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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{
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isslave = 1;
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}
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else
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{
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isslave = 0;
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}
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}
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}
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else
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{
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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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if (mysql_field_count(database->con) < 40)
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{
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mysql_free_result(result);
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if (server_version < 5 * 10000 + 5 * 100)
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{
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if (database->log_version_err)
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{
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MXS_ERROR("\"SHOW SLAVE STATUS\" "
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" for versions less than 5.5 does not have master_server_id, "
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"replication tree cannot be resolved for server %s."
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" MySQL Version: %s", database->server->unique_name, version_str);
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database->log_version_err = false;
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}
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}
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else
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{
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MXS_ERROR("\"SHOW SLAVE STATUS\" "
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"returned less than the expected amount of columns. "
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"Expected 40 columns. MySQL Version: %s", version_str);
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}
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return;
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}
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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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{
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isslave = 1;
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}
|
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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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{
|
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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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{
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master_id = -1;
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}
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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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|
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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)
|
|
{
|
|
if (mysql_field_count(database->con) < 2)
|
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{
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mysql_free_result(result);
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MXS_ERROR("Unexpected result for \"SHOW GLOBAL VARIABLES LIKE 'read_only'\". "
|
|
"Expected 2 columns. MySQL Version: %s", version_str);
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return;
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}
|
|
|
|
while ((row = mysql_fetch_row(result)))
|
|
{
|
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if (strncasecmp(row[1], "OFF", 3) == 0)
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{
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ismaster = 1;
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}
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else
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{
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isslave = 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);
|
|
|
|
/* Set the Slave Role */
|
|
/* Set the Master role */
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|
if (ismaster)
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|
{
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monitor_clear_pending_status(database, SERVER_SLAVE);
|
|
monitor_set_pending_status(database, SERVER_MASTER);
|
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|
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/* Set replication depth to 0 */
|
|
database->server->depth = 0;
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|
}
|
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else 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 */
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monitor_clear_pending_status(database, SERVER_MASTER);
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|
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/* Set replication depth to 1 */
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database->server->depth = 1;
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}
|
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/* Avoid any possible Master/Slave stale state */
|
|
else
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{
|
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monitor_clear_pending_status(database, SERVER_SLAVE);
|
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monitor_clear_pending_status(database, SERVER_MASTER);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The entry point for the monitoring module thread
|
|
*
|
|
* @param arg The handle of the monitor
|
|
*/
|
|
static void
|
|
monitorMain(void *arg)
|
|
{
|
|
MONITOR* mon = (MONITOR*) arg;
|
|
MM_MONITOR *handle;
|
|
MONITOR_SERVERS *ptr;
|
|
int detect_stale_master = false;
|
|
MONITOR_SERVERS *root_master = NULL;
|
|
size_t nrounds = 0;
|
|
|
|
spinlock_acquire(&mon->lock);
|
|
handle = (MM_MONITOR *) mon->handle;
|
|
spinlock_release(&mon->lock);
|
|
detect_stale_master = handle->detectStaleMaster;
|
|
|
|
if (mysql_thread_init())
|
|
{
|
|
MXS_ERROR("Fatal : mysql_thread_init failed in monitor module. Exiting.");
|
|
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) % mon->interval) >=
|
|
MON_BASE_INTERVAL_MS)
|
|
{
|
|
nrounds += 1;
|
|
continue;
|
|
}
|
|
nrounds += 1;
|
|
|
|
/* start from the first server in the list */
|
|
ptr = mon->databases;
|
|
|
|
while (ptr)
|
|
{
|
|
/* copy server status into monitor pending_status */
|
|
ptr->pending_status = ptr->server->status;
|
|
|
|
/* monitor current node */
|
|
monitorDatabase(mon, ptr);
|
|
|
|
if (mon_status_changed(ptr) ||
|
|
mon_print_fail_status(ptr))
|
|
{
|
|
MXS_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(mon);
|
|
|
|
/* Update server status from monitor pending status on that server*/
|
|
|
|
ptr = mon->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 */
|
|
MXS_NOTICE("[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;
|
|
}
|
|
|
|
ptr = mon->databases;
|
|
monitor_event_t evtype;
|
|
while (ptr)
|
|
{
|
|
if (mon_status_changed(ptr))
|
|
{
|
|
evtype = mon_get_event_type(ptr);
|
|
if (isMySQLEvent(evtype))
|
|
{
|
|
mon_log_state_change(ptr);
|
|
if (handle->script && handle->events[evtype])
|
|
{
|
|
monitor_launch_script(mon, ptr, handle->script);
|
|
}
|
|
}
|
|
}
|
|
ptr = ptr->next;
|
|
}
|
|
|
|
mon_hangup_failed_servers(mon);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
/* Not used
|
|
static void
|
|
detectStaleMaster(void *arg, int enable)
|
|
{
|
|
MONITOR* mon = (MONITOR*) arg;
|
|
MM_MONITOR *handle = (MM_MONITOR *) mon->handle;
|
|
memcpy(&handle->detectStaleMaster, &enable, sizeof(int));
|
|
}
|
|
*/
|
|
|
|
/*******
|
|
* 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(MONITOR *mon)
|
|
{
|
|
MM_MONITOR* handle = mon->handle;
|
|
MONITOR_SERVERS *ptr;
|
|
|
|
ptr = mon->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;
|
|
}
|
|
}
|
|
|
|
|
|
static monitor_event_t mysql_events[] =
|
|
{
|
|
MASTER_DOWN_EVENT,
|
|
MASTER_UP_EVENT,
|
|
SLAVE_DOWN_EVENT,
|
|
SLAVE_UP_EVENT,
|
|
SERVER_DOWN_EVENT,
|
|
SERVER_UP_EVENT,
|
|
LOST_MASTER_EVENT,
|
|
LOST_SLAVE_EVENT,
|
|
NEW_MASTER_EVENT,
|
|
NEW_SLAVE_EVENT,
|
|
MAX_MONITOR_EVENT
|
|
};
|
|
|
|
/**
|
|
* Check if the MM monitor is monitoring this event type.
|
|
* @param event Event to check
|
|
* @return True if the event is monitored, false if it is not
|
|
* */
|
|
bool isMySQLEvent(monitor_event_t event)
|
|
{
|
|
int i;
|
|
for (i = 0; mysql_events[i] != MAX_MONITOR_EVENT; i++)
|
|
{
|
|
if (event == mysql_events[i])
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|