job ID) for unclaimed jobs used for de-duplication * - h-sha1ById : A hash of (job ID => SHA1) for unclaimed jobs used for de-duplication * - h-attempts : A hash of (job ID => attempt count) used for job claiming/retries * - h-data : A hash of (job ID => serialized blobs) for job storage * A job ID can be in only one of z-delayed, l-unclaimed, z-claimed, and z-abandoned. * If an ID appears in any of those lists, it should have a h-data entry for its ID. * If a job has a SHA1 de-duplication value and its ID is in l-unclaimed or z-delayed, then * there should be no other such jobs with that SHA1. Every h-idBySha1 entry has an h-sha1ById * entry and every h-sha1ById must refer to an ID that is l-unclaimed. If a job has its * ID in z-claimed or z-abandoned, then it must also have an h-attempts entry for its ID. * * Additionally, "rootjob:* keys track "root jobs" used for additional de-duplication. * Aside from root job keys, all keys have no expiry, and are only removed when jobs are run. * All the keys are prefixed with the relevant wiki ID information. * * This class requires Redis 2.6 as it makes use Lua scripts for fast atomic operations. * Additionally, it should be noted that redis has different persistence modes, such * as rdb snapshots, journaling, and no persistence. Appropriate configuration should be * made on the servers based on what queues are using it and what tolerance they have. * * @ingroup JobQueue * @ingroup Redis * @since 1.22 */ class JobQueueRedis extends JobQueue { /** @var RedisConnectionPool */ protected $redisPool; /** @var string Server address */ protected $server; /** @var string Compression method to use */ protected $compression; const MAX_AGE_PRUNE = 604800; // integer; seconds a job can live once claimed (7 days) /** @var string Key to prefix the queue keys with (used for testing) */ protected $key; /** * @param array $params Possible keys: * - redisConfig : An array of parameters to RedisConnectionPool::__construct(). * Note that the serializer option is ignored as "none" is always used. * - redisServer : A hostname/port combination or the absolute path of a UNIX socket. * If a hostname is specified but no port, the standard port number * 6379 will be used. Required. * - compression : The type of compression to use; one of (none,gzip). * - daemonized : Set to true if the redisJobRunnerService runs in the background. * This will disable job recycling/undelaying from the MediaWiki side * to avoid redundance and out-of-sync configuration. */ public function __construct( array $params ) { parent::__construct( $params ); $params['redisConfig']['serializer'] = 'none'; // make it easy to use Lua $this->server = $params['redisServer']; $this->compression = isset( $params['compression'] ) ? $params['compression'] : 'none'; $this->redisPool = RedisConnectionPool::singleton( $params['redisConfig'] ); if ( empty( $params['daemonized'] ) ) { throw new Exception( "Non-daemonized mode is no longer supported. Please install the " . "mediawiki/services/jobrunner service and update \$wgJobTypeConf as needed." ); } } protected function supportedOrders() { return array( 'timestamp', 'fifo' ); } protected function optimalOrder() { return 'fifo'; } protected function supportsDelayedJobs() { return true; } /** * @see JobQueue::doIsEmpty() * @return bool * @throws MWException */ protected function doIsEmpty() { return $this->doGetSize() == 0; } /** * @see JobQueue::doGetSize() * @return int * @throws MWException */ protected function doGetSize() { $conn = $this->getConnection(); try { return $conn->lSize( $this->getQueueKey( 'l-unclaimed' ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::doGetAcquiredCount() * @return int * @throws JobQueueError */ protected function doGetAcquiredCount() { $conn = $this->getConnection(); try { $conn->multi( Redis::PIPELINE ); $conn->zSize( $this->getQueueKey( 'z-claimed' ) ); $conn->zSize( $this->getQueueKey( 'z-abandoned' ) ); return array_sum( $conn->exec() ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::doGetDelayedCount() * @return int * @throws JobQueueError */ protected function doGetDelayedCount() { $conn = $this->getConnection(); try { return $conn->zSize( $this->getQueueKey( 'z-delayed' ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::doGetAbandonedCount() * @return int * @throws JobQueueError */ protected function doGetAbandonedCount() { $conn = $this->getConnection(); try { return $conn->zSize( $this->getQueueKey( 'z-abandoned' ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::doBatchPush() * @param array $jobs * @param int $flags * @return void * @throws JobQueueError */ protected function doBatchPush( array $jobs, $flags ) { // Convert the jobs into field maps (de-duplicated against each other) $items = array(); // (job ID => job fields map) foreach ( $jobs as $job ) { $item = $this->getNewJobFields( $job ); if ( strlen( $item['sha1'] ) ) { // hash identifier => de-duplicate $items[$item['sha1']] = $item; } else { $items[$item['uuid']] = $item; } } if ( !count( $items ) ) { return; // nothing to do } $conn = $this->getConnection(); try { // Actually push the non-duplicate jobs into the queue... if ( $flags & self::QOS_ATOMIC ) { $batches = array( $items ); // all or nothing } else { $batches = array_chunk( $items, 500 ); // avoid tying up the server } $failed = 0; $pushed = 0; foreach ( $batches as $itemBatch ) { $added = $this->pushBlobs( $conn, $itemBatch ); if ( is_int( $added ) ) { $pushed += $added; } else { $failed += count( $itemBatch ); } } if ( $failed > 0 ) { wfDebugLog( 'JobQueueRedis', "Could not insert {$failed} {$this->type} job(s)." ); throw new RedisException( "Could not insert {$failed} {$this->type} job(s)." ); } JobQueue::incrStats( 'job-insert', $this->type, count( $items ), $this->wiki ); JobQueue::incrStats( 'job-insert-duplicate', $this->type, count( $items ) - $failed - $pushed, $this->wiki ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @param RedisConnRef $conn * @param array $items List of results from JobQueueRedis::getNewJobFields() * @return int Number of jobs inserted (duplicates are ignored) * @throws RedisException */ protected function pushBlobs( RedisConnRef $conn, array $items ) { $args = array(); // ([id, sha1, rtime, blob [, id, sha1, rtime, blob ... ] ] ) foreach ( $items as $item ) { $args[] = (string)$item['uuid']; $args[] = (string)$item['sha1']; $args[] = (string)$item['rtimestamp']; $args[] = (string)$this->serialize( $item ); } static $script = << 0 then -- Insert into delayed queue (release time as score) redis.call('zAdd',kDelayed,rtimestamp,id) else -- Insert into unclaimed queue redis.call('lPush',kUnclaimed,id) end if sha1 ~= '' then redis.call('hSet',kSha1ById,id,sha1) redis.call('hSet',kIdBySha1,sha1,id) end redis.call('hSet',kData,id,blob) pushed = pushed + 1 end end return pushed LUA; return $conn->luaEval( $script, array_merge( array( $this->getQueueKey( 'l-unclaimed' ), # KEYS[1] $this->getQueueKey( 'h-sha1ById' ), # KEYS[2] $this->getQueueKey( 'h-idBySha1' ), # KEYS[3] $this->getQueueKey( 'z-delayed' ), # KEYS[4] $this->getQueueKey( 'h-data' ), # KEYS[5] ), $args ), 5 # number of first argument(s) that are keys ); } /** * @see JobQueue::doPop() * @return Job|bool * @throws JobQueueError */ protected function doPop() { $job = false; $conn = $this->getConnection(); try { do { $blob = $this->popAndAcquireBlob( $conn ); if ( !is_string( $blob ) ) { break; // no jobs; nothing to do } JobQueue::incrStats( 'job-pop', $this->type, 1, $this->wiki ); $item = $this->unserialize( $blob ); if ( $item === false ) { wfDebugLog( 'JobQueueRedis', "Could not unserialize {$this->type} job." ); continue; } // If $item is invalid, the runner loop recyling will cleanup as needed $job = $this->getJobFromFields( $item ); // may be false } while ( !$job ); // job may be false if invalid } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } return $job; } /** * @param RedisConnRef $conn * @return array Serialized string or false * @throws RedisException */ protected function popAndAcquireBlob( RedisConnRef $conn ) { static $script = <<luaEval( $script, array( $this->getQueueKey( 'l-unclaimed' ), # KEYS[1] $this->getQueueKey( 'h-sha1ById' ), # KEYS[2] $this->getQueueKey( 'h-idBySha1' ), # KEYS[3] $this->getQueueKey( 'z-claimed' ), # KEYS[4] $this->getQueueKey( 'h-attempts' ), # KEYS[5] $this->getQueueKey( 'h-data' ), # KEYS[6] time(), # ARGV[1] (injected to be replication-safe) ), 6 # number of first argument(s) that are keys ); } /** * @see JobQueue::doAck() * @param Job $job * @return Job|bool * @throws MWException|JobQueueError */ protected function doAck( Job $job ) { if ( !isset( $job->metadata['uuid'] ) ) { throw new MWException( "Job of type '{$job->getType()}' has no UUID." ); } $conn = $this->getConnection(); try { static $script = <<luaEval( $script, array( $this->getQueueKey( 'z-claimed' ), # KEYS[1] $this->getQueueKey( 'h-attempts' ), # KEYS[2] $this->getQueueKey( 'h-data' ), # KEYS[3] $job->metadata['uuid'] # ARGV[1] ), 3 # number of first argument(s) that are keys ); if ( !$res ) { wfDebugLog( 'JobQueueRedis', "Could not acknowledge {$this->type} job." ); return false; } } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } return true; } /** * @see JobQueue::doDeduplicateRootJob() * @param Job $job * @return bool * @throws MWException|JobQueueError */ protected function doDeduplicateRootJob( Job $job ) { if ( !$job->hasRootJobParams() ) { throw new MWException( "Cannot register root job; missing parameters." ); } $params = $job->getRootJobParams(); $key = $this->getRootJobCacheKey( $params['rootJobSignature'] ); $conn = $this->getConnection(); try { $timestamp = $conn->get( $key ); // current last timestamp of this job if ( $timestamp && $timestamp >= $params['rootJobTimestamp'] ) { return true; // a newer version of this root job was enqueued } // Update the timestamp of the last root job started at the location... return $conn->set( $key, $params['rootJobTimestamp'], self::ROOTJOB_TTL ); // 2 weeks } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::doIsRootJobOldDuplicate() * @param Job $job * @return bool * @throws JobQueueError */ protected function doIsRootJobOldDuplicate( Job $job ) { if ( !$job->hasRootJobParams() ) { return false; // job has no de-deplication info } $params = $job->getRootJobParams(); $conn = $this->getConnection(); try { // Get the last time this root job was enqueued $timestamp = $conn->get( $this->getRootJobCacheKey( $params['rootJobSignature'] ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } // Check if a new root job was started at the location after this one's... return ( $timestamp && $timestamp > $params['rootJobTimestamp'] ); } /** * @see JobQueue::doDelete() * @return bool * @throws JobQueueError */ protected function doDelete() { static $props = array( 'l-unclaimed', 'z-claimed', 'z-abandoned', 'z-delayed', 'h-idBySha1', 'h-sha1ById', 'h-attempts', 'h-data' ); $conn = $this->getConnection(); try { $keys = array(); foreach ( $props as $prop ) { $keys[] = $this->getQueueKey( $prop ); } return ( $conn->delete( $keys ) !== false ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::getAllQueuedJobs() * @return Iterator */ public function getAllQueuedJobs() { $conn = $this->getConnection(); try { $that = $this; return new MappedIterator( $conn->lRange( $this->getQueueKey( 'l-unclaimed' ), 0, -1 ), function ( $uid ) use ( $that, $conn ) { return $that->getJobFromUidInternal( $uid, $conn ); }, array( 'accept' => function ( $job ) { return is_object( $job ); } ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::getAllQueuedJobs() * @return Iterator */ public function getAllDelayedJobs() { $conn = $this->getConnection(); try { $that = $this; return new MappedIterator( // delayed jobs $conn->zRange( $this->getQueueKey( 'z-delayed' ), 0, -1 ), function ( $uid ) use ( $that, $conn ) { return $that->getJobFromUidInternal( $uid, $conn ); }, array( 'accept' => function ( $job ) { return is_object( $job ); } ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @see JobQueue::getAllAbandonedJobs() * @return Iterator */ public function getAllAbandonedJobs() { $conn = $this->getConnection(); try { $that = $this; return new MappedIterator( // delayed jobs $conn->zRange( $this->getQueueKey( 'z-abandoned' ), 0, -1 ), function ( $uid ) use ( $that, $conn ) { return $that->getJobFromUidInternal( $uid, $conn ); }, array( 'accept' => function ( $job ) { return is_object( $job ); } ) ); } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } public function getCoalesceLocationInternal() { return "RedisServer:" . $this->server; } protected function doGetSiblingQueuesWithJobs( array $types ) { return array_keys( array_filter( $this->doGetSiblingQueueSizes( $types ) ) ); } protected function doGetSiblingQueueSizes( array $types ) { $sizes = array(); // (type => size) $types = array_values( $types ); // reindex $conn = $this->getConnection(); try { $conn->multi( Redis::PIPELINE ); foreach ( $types as $type ) { $conn->lSize( $this->getQueueKey( 'l-unclaimed', $type ) ); } $res = $conn->exec(); if ( is_array( $res ) ) { foreach ( $res as $i => $size ) { $sizes[$types[$i]] = $size; } } } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } return $sizes; } /** * This function should not be called outside JobQueueRedis * * @param string $uid * @param RedisConnRef $conn * @return Job|bool Returns false if the job does not exist * @throws MWException|JobQueueError */ public function getJobFromUidInternal( $uid, RedisConnRef $conn ) { try { $data = $conn->hGet( $this->getQueueKey( 'h-data' ), $uid ); if ( $data === false ) { return false; // not found } $item = $this->unserialize( $conn->hGet( $this->getQueueKey( 'h-data' ), $uid ) ); if ( !is_array( $item ) ) { // this shouldn't happen throw new MWException( "Could not find job with ID '$uid'." ); } $title = Title::makeTitle( $item['namespace'], $item['title'] ); $job = Job::factory( $item['type'], $title, $item['params'] ); $job->metadata['uuid'] = $item['uuid']; return $job; } catch ( RedisException $e ) { $this->throwRedisException( $conn, $e ); } } /** * @return array */ protected function doGetPeriodicTasks() { return array(); // managed in the runner loop } /** * @param IJobSpecification $job * @return array */ protected function getNewJobFields( IJobSpecification $job ) { return array( // Fields that describe the nature of the job 'type' => $job->getType(), 'namespace' => $job->getTitle()->getNamespace(), 'title' => $job->getTitle()->getDBkey(), 'params' => $job->getParams(), // Some jobs cannot run until a "release timestamp" 'rtimestamp' => $job->getReleaseTimestamp() ?: 0, // Additional job metadata 'uuid' => UIDGenerator::newRawUUIDv4( UIDGenerator::QUICK_RAND ), 'sha1' => $job->ignoreDuplicates() ? wfBaseConvert( sha1( serialize( $job->getDeduplicationInfo() ) ), 16, 36, 31 ) : '', 'timestamp' => time() // UNIX timestamp ); } /** * @param array $fields * @return Job|bool */ protected function getJobFromFields( array $fields ) { $title = Title::makeTitleSafe( $fields['namespace'], $fields['title'] ); if ( $title ) { $job = Job::factory( $fields['type'], $title, $fields['params'] ); $job->metadata['uuid'] = $fields['uuid']; return $job; } return false; } /** * @param array $fields * @return string Serialized and possibly compressed version of $fields */ protected function serialize( array $fields ) { $blob = serialize( $fields ); if ( $this->compression === 'gzip' && strlen( $blob ) >= 1024 && function_exists( 'gzdeflate' ) ) { $object = (object)array( 'blob' => gzdeflate( $blob ), 'enc' => 'gzip' ); $blobz = serialize( $object ); return ( strlen( $blobz ) < strlen( $blob ) ) ? $blobz : $blob; } else { return $blob; } } /** * @param string $blob * @return array|bool Unserialized version of $blob or false */ protected function unserialize( $blob ) { $fields = unserialize( $blob ); if ( is_object( $fields ) ) { if ( $fields->enc === 'gzip' && function_exists( 'gzinflate' ) ) { $fields = unserialize( gzinflate( $fields->blob ) ); } else { $fields = false; } } return is_array( $fields ) ? $fields : false; } /** * Get a connection to the server that handles all sub-queues for this queue * * @return RedisConnRef * @throws JobQueueConnectionError */ protected function getConnection() { $conn = $this->redisPool->getConnection( $this->server ); if ( !$conn ) { throw new JobQueueConnectionError( "Unable to connect to redis server." ); } return $conn; } /** * @param RedisConnRef $conn * @param RedisException $e * @throws JobQueueError */ protected function throwRedisException( RedisConnRef $conn, $e ) { $this->redisPool->handleError( $conn, $e ); throw new JobQueueError( "Redis server error: {$e->getMessage()}\n" ); } /** * @param string $prop * @param string|null $type * @return string */ private function getQueueKey( $prop, $type = null ) { $type = is_string( $type ) ? $type : $this->type; list( $db, $prefix ) = wfSplitWikiID( $this->wiki ); if ( strlen( $this->key ) ) { // namespaced queue (for testing) return wfForeignMemcKey( $db, $prefix, 'jobqueue', $type, $this->key, $prop ); } else { return wfForeignMemcKey( $db, $prefix, 'jobqueue', $type, $prop ); } } /** * @param string $key * @return void */ public function setTestingPrefix( $key ) { $this->key = $key; } }