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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | namespace Wikimedia\Rdbms\Replication; |
| 7 | |
| 8 | use InvalidArgumentException; |
| 9 | use Psr\Log\LoggerInterface; |
| 10 | use RuntimeException; |
| 11 | use stdClass; |
| 12 | use Wikimedia\ObjectCache\BagOStuff; |
| 13 | use Wikimedia\Rdbms\DBPrimaryPos; |
| 14 | use Wikimedia\Rdbms\DBQueryError; |
| 15 | use Wikimedia\Rdbms\IDatabase; |
| 16 | use Wikimedia\Rdbms\MySQLPrimaryPos; |
| 17 | use Wikimedia\Rdbms\Platform\ISQLPlatform; |
| 18 | use Wikimedia\Rdbms\Query; |
| 19 | use Wikimedia\Timestamp\ConvertibleTimestamp; |
| 20 | |
| 21 | /** |
| 22 | * @internal |
| 23 | * @ingroup Database |
| 24 | * @since 1.40 |
| 25 | */ |
| 26 | class MysqlReplicationReporter extends ReplicationReporter { |
| 27 | /** @var MySQLPrimaryPos */ |
| 28 | protected $lastKnownReplicaPos; |
| 29 | /** @var string Method to detect replica DB lag */ |
| 30 | protected $lagDetectionMethod; |
| 31 | /** @var array Method to detect replica DB lag */ |
| 32 | protected $lagDetectionOptions = []; |
| 33 | /** @var bool bool Whether to use GTID methods */ |
| 34 | protected $useGTIDs = false; |
| 35 | /** @var stdClass|null */ |
| 36 | private $replicationInfoRow; |
| 37 | // Cache getServerId() for 24 hours |
| 38 | private const SERVER_ID_CACHE_TTL = 86400; |
| 39 | |
| 40 | /** @var float Warn if lag estimates are made for transactions older than this many seconds */ |
| 41 | private const LAG_STALE_WARN_THRESHOLD = 0.100; |
| 42 | |
| 43 | /** |
| 44 | * @param string $topologyRole |
| 45 | * @param LoggerInterface $logger |
| 46 | * @param BagOStuff $srvCache |
| 47 | * @param string $lagDetectionMethod |
| 48 | * @param array $lagDetectionOptions |
| 49 | * @param bool $useGTIDs |
| 50 | */ |
| 51 | public function __construct( |
| 52 | $topologyRole, |
| 53 | $logger, |
| 54 | $srvCache, |
| 55 | $lagDetectionMethod, |
| 56 | $lagDetectionOptions, |
| 57 | $useGTIDs |
| 58 | ) { |
| 59 | parent::__construct( $topologyRole, $logger, $srvCache ); |
| 60 | $this->lagDetectionMethod = $lagDetectionMethod; |
| 61 | $this->lagDetectionOptions = $lagDetectionOptions; |
| 62 | $this->useGTIDs = $useGTIDs; |
| 63 | } |
| 64 | |
| 65 | /** @inheritDoc */ |
| 66 | protected function doGetLag( IDatabase $conn ) { |
| 67 | if ( $this->lagDetectionMethod === 'pt-heartbeat' ) { |
| 68 | return $this->getLagFromPtHeartbeat( $conn ); |
| 69 | } else { |
| 70 | return $this->getLagFromSlaveStatus( $conn ); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @param IDatabase $conn To make queries |
| 76 | * @return int|false Second of lag |
| 77 | */ |
| 78 | protected function getLagFromSlaveStatus( IDatabase $conn ) { |
| 79 | $query = new Query( |
| 80 | 'SHOW SLAVE STATUS', |
| 81 | ISQLPlatform::QUERY_SILENCE_ERRORS | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 82 | 'SHOW', |
| 83 | null, |
| 84 | 'SHOW SLAVE STATUS' |
| 85 | ); |
| 86 | $res = $conn->query( $query, __METHOD__ ); |
| 87 | $row = $res ? $res->fetchObject() : false; |
| 88 | // If the server is not replicating, there will be no row |
| 89 | if ( $row && strval( $row->Seconds_Behind_Master ) !== '' ) { |
| 90 | // https://mariadb.com/kb/en/delayed-replication/ |
| 91 | // https://dev.mysql.com/doc/refman/5.6/en/replication-delayed.html |
| 92 | return intval( $row->Seconds_Behind_Master + ( $row->SQL_Remaining_Delay ?? 0 ) ); |
| 93 | } |
| 94 | |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * @param IDatabase $conn To make queries |
| 100 | * @return float|false Seconds of lag |
| 101 | */ |
| 102 | protected function getLagFromPtHeartbeat( IDatabase $conn ) { |
| 103 | $currentTrxInfo = $this->getRecordedTransactionLagStatus( $conn ); |
| 104 | if ( $currentTrxInfo ) { |
| 105 | // There is an active transaction and the initial lag was already queried |
| 106 | $staleness = microtime( true ) - $currentTrxInfo['since']; |
| 107 | if ( $staleness > self::LAG_STALE_WARN_THRESHOLD ) { |
| 108 | // Avoid returning higher and higher lag value due to snapshot age |
| 109 | // given that the isolation level will typically be REPEATABLE-READ |
| 110 | // but UTC_TIMESTAMP() is not affected by point-in-time snapshots |
| 111 | $this->logger->warning( |
| 112 | "Using cached lag value for {db_server} due to active transaction", |
| 113 | $this->getLogContext( $conn, [ |
| 114 | 'method' => __METHOD__, |
| 115 | 'age' => $staleness, |
| 116 | 'exception' => new RuntimeException() |
| 117 | ] ) |
| 118 | ); |
| 119 | } |
| 120 | |
| 121 | return $currentTrxInfo['lag']; |
| 122 | } |
| 123 | |
| 124 | $ago = $this->fetchSecondsSinceHeartbeat( $conn ); |
| 125 | if ( $ago !== null ) { |
| 126 | return max( $ago, 0.0 ); |
| 127 | } |
| 128 | |
| 129 | $this->logger->error( |
| 130 | "Unable to find pt-heartbeat row for {db_server}", |
| 131 | $this->getLogContext( $conn, [ |
| 132 | 'method' => __METHOD__ |
| 133 | ] ) |
| 134 | ); |
| 135 | |
| 136 | return false; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * @param IDatabase $conn To make queries |
| 141 | * @return float|null Elapsed seconds since the newest beat or null if none was found |
| 142 | * @see https://www.percona.com/doc/percona-toolkit/2.1/pt-heartbeat.html |
| 143 | */ |
| 144 | protected function fetchSecondsSinceHeartbeat( IDatabase $conn ) { |
| 145 | // Some setups might have pt-heartbeat running on each replica server. |
| 146 | // Exclude the row for events originating on this DB server. Assume that |
| 147 | // there is only one active replication channel and that any other row |
| 148 | // getting updates must be the row for the primary DB server. |
| 149 | $where = $conn->makeList( |
| 150 | $this->lagDetectionOptions['conds'] ?? [ 'server_id != @@server_id' ], |
| 151 | ISQLPlatform::LIST_AND |
| 152 | ); |
| 153 | // User mysql server time so that query time and trip time are not counted. |
| 154 | // Use ORDER BY for channel based queries since that field might not be UNIQUE. |
| 155 | $query = new Query( |
| 156 | "SELECT TIMESTAMPDIFF(MICROSECOND,ts,UTC_TIMESTAMP(6)) AS us_ago " . |
| 157 | "FROM heartbeat.heartbeat WHERE $where ORDER BY ts DESC LIMIT 1", |
| 158 | ISQLPlatform::QUERY_SILENCE_ERRORS | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 159 | 'SELECT', |
| 160 | null, |
| 161 | "SELECT TIMESTAMPDIFF(MICROSECOND,ts,UTC_TIMESTAMP(6)) AS us_ago " . |
| 162 | "FROM heartbeat.heartbeat WHERE ? ORDER BY ts DESC LIMIT 1", |
| 163 | ); |
| 164 | $res = $conn->query( $query, __METHOD__ ); |
| 165 | $row = $res ? $res->fetchObject() : false; |
| 166 | |
| 167 | return $row ? ( $row->us_ago / 1e6 ) : null; |
| 168 | } |
| 169 | |
| 170 | /** @inheritDoc */ |
| 171 | public function getApproximateLagStatus( IDatabase $conn ) { |
| 172 | if ( $this->lagDetectionMethod === 'pt-heartbeat' ) { |
| 173 | // Disable caching since this is fast enough and we don't want |
| 174 | // to be *too* pessimistic by having both the cache TTL and the |
| 175 | // pt-heartbeat interval count as lag in getSessionLagStatus() |
| 176 | return parent::getApproximateLagStatus( $conn ); |
| 177 | } |
| 178 | |
| 179 | $key = $this->srvCache->makeGlobalKey( 'mysql-lag', $conn->getServerName() ); |
| 180 | $approxLag = $this->srvCache->get( $key ); |
| 181 | if ( !$approxLag ) { |
| 182 | $approxLag = parent::getApproximateLagStatus( $conn ); |
| 183 | $this->srvCache->set( $key, $approxLag, 1 ); |
| 184 | } |
| 185 | |
| 186 | return $approxLag; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * @param IDatabase $conn To make queries |
| 191 | * @param string $fname |
| 192 | * @return stdClass Process cached row |
| 193 | */ |
| 194 | public function getReplicationSafetyInfo( IDatabase $conn, $fname ) { |
| 195 | if ( $this->replicationInfoRow === null ) { |
| 196 | $this->replicationInfoRow = $conn->selectRow( |
| 197 | [], |
| 198 | [ |
| 199 | 'innodb_autoinc_lock_mode' => '@@innodb_autoinc_lock_mode', |
| 200 | 'binlog_format' => '@@binlog_format', |
| 201 | ], |
| 202 | [], |
| 203 | $fname |
| 204 | ); |
| 205 | } |
| 206 | return $this->replicationInfoRow; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * @return bool Whether GTID support is used (mockable for testing) |
| 211 | */ |
| 212 | protected function useGTIDs() { |
| 213 | return $this->useGTIDs; |
| 214 | } |
| 215 | |
| 216 | /** @inheritDoc */ |
| 217 | public function primaryPosWait( IDatabase $conn, DBPrimaryPos $pos, $timeout ) { |
| 218 | if ( !( $pos instanceof MySQLPrimaryPos ) ) { |
| 219 | throw new InvalidArgumentException( "Position not an instance of MySQLPrimaryPos" ); |
| 220 | } |
| 221 | |
| 222 | if ( $this->topologyRole === IDatabase::ROLE_STATIC_CLONE ) { |
| 223 | $this->logger->debug( |
| 224 | "Bypassed replication wait; database has a static dataset", |
| 225 | $this->getLogContext( $conn, [ 'method' => __METHOD__, 'raw_pos' => $pos ] ) |
| 226 | ); |
| 227 | |
| 228 | return 0; // this is a copy of a read-only dataset with no primary DB |
| 229 | } elseif ( $this->lastKnownReplicaPos && $this->lastKnownReplicaPos->hasReached( $pos ) ) { |
| 230 | $this->logger->debug( |
| 231 | "Bypassed replication wait; replication known to have reached {raw_pos}", |
| 232 | $this->getLogContext( $conn, [ 'method' => __METHOD__, 'raw_pos' => $pos ] ) |
| 233 | ); |
| 234 | |
| 235 | return 0; // already reached this point for sure |
| 236 | } |
| 237 | |
| 238 | // Call doQuery() directly, to avoid opening a transaction if DBO_TRX is set |
| 239 | if ( $pos->getGTIDs() ) { |
| 240 | // Get the GTIDs from this replica server too see the domains (channels) |
| 241 | $refPos = $this->getReplicaPos( $conn ); |
| 242 | if ( !$refPos ) { |
| 243 | $this->logger->error( |
| 244 | "Could not get replication position on replica DB to compare to {raw_pos}", |
| 245 | $this->getLogContext( $conn, [ 'method' => __METHOD__, 'raw_pos' => $pos ] ) |
| 246 | ); |
| 247 | |
| 248 | return -1; // this is the primary DB itself? |
| 249 | } |
| 250 | // GTIDs with domains (channels) that are active and are present on the replica |
| 251 | $gtidsWait = $pos::getRelevantActiveGTIDs( $pos, $refPos ); |
| 252 | if ( !$gtidsWait ) { |
| 253 | $this->logger->error( |
| 254 | "No active GTIDs in {raw_pos} share a domain with those in {current_pos}", |
| 255 | $this->getLogContext( $conn, [ |
| 256 | 'method' => __METHOD__, |
| 257 | 'raw_pos' => $pos, |
| 258 | 'current_pos' => $refPos |
| 259 | ] ) |
| 260 | ); |
| 261 | |
| 262 | return -1; // $pos is from the wrong cluster? |
| 263 | } |
| 264 | // Wait on the GTID set |
| 265 | $gtidArg = $conn->addQuotes( implode( ',', $gtidsWait ) ); |
| 266 | if ( str_contains( $gtidArg, ':' ) ) { |
| 267 | // MySQL GTIDs, e.g "source_id:transaction_id" |
| 268 | $query = new Query( |
| 269 | "SELECT WAIT_FOR_EXECUTED_GTID_SET($gtidArg, $timeout)", |
| 270 | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 271 | 'SELECT', |
| 272 | null, |
| 273 | "SELECT WAIT_FOR_EXECUTED_GTID_SET(?, ?)" |
| 274 | ); |
| 275 | } else { |
| 276 | // MariaDB GTIDs, e.g."domain:server:sequence" |
| 277 | $query = new Query( |
| 278 | "SELECT MASTER_GTID_WAIT($gtidArg, $timeout)", |
| 279 | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 280 | 'SELECT', |
| 281 | null, |
| 282 | "SELECT MASTER_GTID_WAIT(?, ?)" |
| 283 | ); |
| 284 | } |
| 285 | $waitPos = implode( ',', $gtidsWait ); |
| 286 | } else { |
| 287 | // Wait on the binlog coordinates |
| 288 | $encFile = $conn->addQuotes( $pos->getLogFile() ); |
| 289 | // @phan-suppress-next-line PhanTypeArraySuspiciousNullable |
| 290 | $encPos = intval( $pos->getLogPosition()[$pos::CORD_EVENT] ); |
| 291 | $query = new Query( |
| 292 | "SELECT MASTER_POS_WAIT($encFile, $encPos, $timeout)", |
| 293 | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 294 | 'SELECT', |
| 295 | null, |
| 296 | "SELECT MASTER_POS_WAIT(?, ?, ?)" |
| 297 | ); |
| 298 | $waitPos = $pos->__toString(); |
| 299 | } |
| 300 | |
| 301 | $start = ConvertibleTimestamp::hrtime(); |
| 302 | $res = $conn->query( $query, __METHOD__ ); |
| 303 | $row = $res->fetchRow(); |
| 304 | $seconds = ( ConvertibleTimestamp::hrtime() - $start ) / 1e9; |
| 305 | |
| 306 | // Result can be NULL (error), -1 (timeout), or 0+ per the MySQL manual |
| 307 | $status = ( $row[0] !== null ) ? intval( $row[0] ) : null; |
| 308 | if ( $status === null ) { |
| 309 | $this->logger->error( |
| 310 | "An error occurred while waiting for replication to reach {wait_pos}", |
| 311 | $this->getLogContext( $conn, [ |
| 312 | 'raw_pos' => $pos, |
| 313 | 'wait_pos' => $waitPos, |
| 314 | 'sql' => $query->getSQL(), |
| 315 | 'seconds_waited' => $seconds, |
| 316 | 'exception' => new RuntimeException() |
| 317 | ] ) |
| 318 | ); |
| 319 | } elseif ( $status < 0 ) { |
| 320 | $this->logger->info( |
| 321 | "Timed out waiting for replication to reach {wait_pos}", |
| 322 | $this->getLogContext( $conn, [ |
| 323 | 'raw_pos' => $pos, |
| 324 | 'wait_pos' => $waitPos, |
| 325 | 'timeout' => $timeout, |
| 326 | 'sql' => $query->getSQL(), |
| 327 | 'seconds_waited' => $seconds, |
| 328 | ] ) |
| 329 | ); |
| 330 | } elseif ( $status >= 0 ) { |
| 331 | $this->logger->debug( |
| 332 | "Replication has reached {wait_pos}", |
| 333 | $this->getLogContext( $conn, [ |
| 334 | 'raw_pos' => $pos, |
| 335 | 'wait_pos' => $waitPos, |
| 336 | 'seconds_waited' => $seconds, |
| 337 | ] ) |
| 338 | ); |
| 339 | // Remember that this position was reached to save queries next time |
| 340 | $this->lastKnownReplicaPos = $pos; |
| 341 | } |
| 342 | |
| 343 | return $status; |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * Get the position of the primary DB from SHOW SLAVE STATUS |
| 348 | * |
| 349 | * @param IDatabase $conn To make queries |
| 350 | * @return MySQLPrimaryPos|false |
| 351 | */ |
| 352 | public function getReplicaPos( IDatabase $conn ) { |
| 353 | $now = microtime( true ); // as-of-time *before* fetching GTID variables |
| 354 | |
| 355 | if ( $this->useGTIDs() ) { |
| 356 | // Try to use GTIDs, fallbacking to binlog positions if not possible |
| 357 | $data = $this->getServerGTIDs( $conn, __METHOD__ ); |
| 358 | // Use gtid_slave_pos for MariaDB and gtid_executed for MySQL |
| 359 | foreach ( [ 'gtid_slave_pos', 'gtid_executed' ] as $name ) { |
| 360 | if ( isset( $data[$name] ) && strlen( $data[$name] ) ) { |
| 361 | return new MySQLPrimaryPos( $data[$name], $now ); |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | $data = $this->getServerRoleStatus( $conn, 'SLAVE', __METHOD__ ); |
| 367 | if ( $data && strlen( $data['Relay_Master_Log_File'] ) ) { |
| 368 | return new MySQLPrimaryPos( |
| 369 | "{$data['Relay_Master_Log_File']}/{$data['Exec_Master_Log_Pos']}", |
| 370 | $now |
| 371 | ); |
| 372 | } |
| 373 | |
| 374 | return false; |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * Get the position of the primary DB from SHOW MASTER STATUS |
| 379 | * |
| 380 | * @param IDatabase $conn To make queries |
| 381 | * @return MySQLPrimaryPos|false |
| 382 | */ |
| 383 | public function getPrimaryPos( IDatabase $conn ) { |
| 384 | $now = microtime( true ); // as-of-time *before* fetching GTID variables |
| 385 | |
| 386 | $pos = false; |
| 387 | if ( $this->useGTIDs() ) { |
| 388 | // Try to use GTIDs, fallbacking to binlog positions if not possible |
| 389 | $data = $this->getServerGTIDs( $conn, __METHOD__ ); |
| 390 | // Use gtid_binlog_pos for MariaDB and gtid_executed for MySQL |
| 391 | foreach ( [ 'gtid_binlog_pos', 'gtid_executed' ] as $name ) { |
| 392 | if ( isset( $data[$name] ) && strlen( $data[$name] ) ) { |
| 393 | $pos = new MySQLPrimaryPos( $data[$name], $now ); |
| 394 | break; |
| 395 | } |
| 396 | } |
| 397 | // Filter domains that are inactive or not relevant to the session |
| 398 | if ( $pos ) { |
| 399 | $pos->setActiveOriginServerId( $this->getServerId( $conn ) ); |
| 400 | $pos->setActiveOriginServerUUID( $this->getServerUUID( $conn ) ); |
| 401 | if ( isset( $data['gtid_domain_id'] ) ) { |
| 402 | $pos->setActiveDomain( $data['gtid_domain_id'] ); |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | if ( !$pos ) { |
| 408 | $data = $this->getServerRoleStatus( $conn, 'MASTER', __METHOD__ ); |
| 409 | if ( $data && strlen( $data['File'] ) ) { |
| 410 | $pos = new MySQLPrimaryPos( "{$data['File']}/{$data['Position']}", $now ); |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | return $pos; |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * @param IDatabase $conn To make queries |
| 419 | * @return string Value of server_id (32-bit integer, unique to the replication topology) |
| 420 | * @throws DBQueryError |
| 421 | */ |
| 422 | protected function getServerId( IDatabase $conn ) { |
| 423 | $fname = __METHOD__; |
| 424 | return $this->srvCache->getWithSetCallback( |
| 425 | $this->srvCache->makeGlobalKey( 'mysql-server-id', $conn->getServerName() ), |
| 426 | self::SERVER_ID_CACHE_TTL, |
| 427 | static function () use ( $conn, $fname ) { |
| 428 | $query = new Query( |
| 429 | "SELECT @@server_id AS id", |
| 430 | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 431 | 'SELECT', |
| 432 | null, |
| 433 | "SELECT @@server_id AS id" |
| 434 | ); |
| 435 | $res = $conn->query( $query, $fname ); |
| 436 | |
| 437 | return $res->fetchObject()->id; |
| 438 | } |
| 439 | ); |
| 440 | } |
| 441 | |
| 442 | /** |
| 443 | * @param IDatabase $conn To make queries |
| 444 | * @return string|null Value of server_uuid (hyphenated 128-bit hex string, globally unique) |
| 445 | * @throws DBQueryError |
| 446 | */ |
| 447 | protected function getServerUUID( IDatabase $conn ) { |
| 448 | $fname = __METHOD__; |
| 449 | return $this->srvCache->getWithSetCallback( |
| 450 | $this->srvCache->makeGlobalKey( 'mysql-server-uuid', $conn->getServerName() ), |
| 451 | self::SERVER_ID_CACHE_TTL, |
| 452 | static function () use ( $conn, $fname ) { |
| 453 | $query = new Query( |
| 454 | "SHOW GLOBAL VARIABLES LIKE 'server_uuid'", |
| 455 | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 456 | 'SHOW', |
| 457 | null, |
| 458 | "SHOW GLOBAL VARIABLES LIKE 'server_uuid'" |
| 459 | ); |
| 460 | $res = $conn->query( $query, $fname ); |
| 461 | $row = $res->fetchObject(); |
| 462 | |
| 463 | return $row ? $row->Value : null; |
| 464 | } |
| 465 | ); |
| 466 | } |
| 467 | |
| 468 | /** |
| 469 | * @param IDatabase $conn To make queries |
| 470 | * @param string $fname |
| 471 | * @return string[] |
| 472 | */ |
| 473 | protected function getServerGTIDs( IDatabase $conn, $fname ) { |
| 474 | $map = []; |
| 475 | |
| 476 | $flags = ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE; |
| 477 | |
| 478 | // Get global-only variables like gtid_executed |
| 479 | $query = new Query( |
| 480 | "SHOW GLOBAL VARIABLES LIKE 'gtid_%'", |
| 481 | $flags, |
| 482 | 'SHOW', |
| 483 | null, |
| 484 | "SHOW GLOBAL VARIABLES LIKE 'gtid_%'" |
| 485 | ); |
| 486 | $res = $conn->query( $query, $fname ); |
| 487 | foreach ( $res as $row ) { |
| 488 | $map[$row->Variable_name] = $row->Value; |
| 489 | } |
| 490 | // Get session-specific (e.g. gtid_domain_id since that is were writes will log) |
| 491 | $query = new Query( |
| 492 | "SHOW SESSION VARIABLES LIKE 'gtid_%'", |
| 493 | $flags, |
| 494 | 'SHOW', |
| 495 | null, |
| 496 | "SHOW SESSION VARIABLES LIKE 'gtid_%'" |
| 497 | ); |
| 498 | $res = $conn->query( $query, $fname ); |
| 499 | foreach ( $res as $row ) { |
| 500 | $map[$row->Variable_name] = $row->Value; |
| 501 | } |
| 502 | |
| 503 | return $map; |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * @param IDatabase $conn To make queries |
| 508 | * @param string $role One of "MASTER"/"SLAVE" |
| 509 | * @param string $fname |
| 510 | * @return array<string,mixed>|null Latest available server status row; false on failure |
| 511 | */ |
| 512 | protected function getServerRoleStatus( IDatabase $conn, $role, $fname ) { |
| 513 | $query = new Query( |
| 514 | "SHOW $role STATUS", |
| 515 | ISQLPlatform::QUERY_SILENCE_ERRORS | ISQLPlatform::QUERY_IGNORE_DBO_TRX | ISQLPlatform::QUERY_CHANGE_NONE, |
| 516 | 'SHOW', |
| 517 | null, |
| 518 | "SHOW $role STATUS" |
| 519 | ); |
| 520 | $res = $conn->query( $query, $fname ); |
| 521 | $row = $res ? $res->fetchRow() : false; |
| 522 | |
| 523 | return ( $row ?: null ); |
| 524 | } |
| 525 | |
| 526 | } |