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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Job; |
| 4 | |
| 5 | use CirrusSearch\ClusterSettings; |
| 6 | use CirrusSearch\Connection; |
| 7 | use CirrusSearch\DataSender; |
| 8 | use MediaWiki\Logger\LoggerFactory; |
| 9 | use MediaWiki\MediaWikiServices; |
| 10 | use Status; |
| 11 | use Wikimedia\Assert\Assert; |
| 12 | |
| 13 | /** |
| 14 | * Performs writes to elasticsearch indexes with requeuing and an |
| 15 | * exponential backoff (if supported by jobqueue) when the index |
| 16 | * writes fail. |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or modify |
| 19 | * it under the terms of the GNU General Public License as published by |
| 20 | * the Free Software Foundation; either version 2 of the License, or |
| 21 | * (at your option) any later version. |
| 22 | * |
| 23 | * This program is distributed in the hope that it will be useful, |
| 24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 26 | * GNU General Public License for more details. |
| 27 | * |
| 28 | * You should have received a copy of the GNU General Public License along |
| 29 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 30 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 31 | * http://www.gnu.org/copyleft/gpl.html |
| 32 | */ |
| 33 | class ElasticaWrite extends CirrusGenericJob { |
| 34 | private const MAX_ERROR_RETRY = 4; |
| 35 | |
| 36 | /** |
| 37 | * @var array Map from method name to list of classes to |
| 38 | * handle serialization for each argument. |
| 39 | */ |
| 40 | private static $SERDE = [ |
| 41 | 'sendData' => [ null, ElasticaDocumentsJsonSerde::class ], |
| 42 | ]; |
| 43 | |
| 44 | /** |
| 45 | * @param ClusterSettings $cluster |
| 46 | * @param string $method |
| 47 | * @param array $arguments |
| 48 | * @param array $params |
| 49 | * @return ElasticaWrite |
| 50 | */ |
| 51 | public static function build( ClusterSettings $cluster, string $method, array $arguments, array $params = [] ) { |
| 52 | return new self( [ |
| 53 | 'method' => $method, |
| 54 | 'arguments' => self::serde( $method, $arguments ), |
| 55 | 'cluster' => $cluster->getName(), |
| 56 | // This does not directly partition the jobs, it only provides a value |
| 57 | // to use during partitioning. The job queue must be separately |
| 58 | // configured to utilize this value. |
| 59 | 'jobqueue_partition' => self::partitioningKey( $cluster ), |
| 60 | ] + $params ); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Generate a cluster specific partitioning key |
| 65 | * |
| 66 | * Some job queue implementations, such as cpjobqueue, can partition the |
| 67 | * execution of jobs based on a parameter of the job. By default we |
| 68 | * provide one partition per cluster, but allow to configure multiple |
| 69 | * partitions per cluster if more throughput is necessary. Within a |
| 70 | * single cluster jobs are distributed randomly. |
| 71 | * |
| 72 | * @param ClusterSettings $settings |
| 73 | * @return string A value suitable for partitioning jobs per-cluster |
| 74 | */ |
| 75 | private static function partitioningKey( ClusterSettings $settings ): string { |
| 76 | $numPartitions = $settings->getElasticaWritePartitionCount(); |
| 77 | $partition = mt_rand() % $numPartitions; |
| 78 | return "{$settings->getName()}-{$partition}"; |
| 79 | } |
| 80 | |
| 81 | private static function serde( $method, array $arguments, $serialize = true ) { |
| 82 | if ( isset( self::$SERDE[$method] ) ) { |
| 83 | foreach ( self::$SERDE[$method] as $i => $serde ) { |
| 84 | if ( $serde !== null && array_key_exists( $i, $arguments ) ) { |
| 85 | $impl = new $serde(); |
| 86 | if ( $serialize ) { |
| 87 | $arguments[$i] = $impl->serialize( $arguments[$i] ); |
| 88 | } else { |
| 89 | $arguments[$i] = $impl->deserialize( $arguments[$i] ); |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | } |
| 94 | return $arguments; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Entry point for jobs received from the job queue. Creating new |
| 99 | * jobs should be done via self::build. |
| 100 | * |
| 101 | * @param array $params |
| 102 | */ |
| 103 | public function __construct( array $params ) { |
| 104 | parent::__construct( $params + [ |
| 105 | 'createdAt' => time(), |
| 106 | 'errorCount' => 0, |
| 107 | 'retryCount' => 0, |
| 108 | 'cluster' => null, |
| 109 | ] ); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * This job handles all its own retries internally. These jobs are so |
| 114 | * numerous that if they were to start failing they would possibly |
| 115 | * overflow the job queue and bring down redis in production. |
| 116 | * |
| 117 | * Basically we just can't let these jobs hang out in the abandoned |
| 118 | * queue for a week like retries typically do. If these jobs get |
| 119 | * failed they will log to CirrusSearchChangeFailed which is a signal |
| 120 | * that some point in time around the failure needs to be reindexed |
| 121 | * manually. See https://wikitech.wikimedia.org/wiki/Search for more |
| 122 | * details. |
| 123 | * @return bool |
| 124 | */ |
| 125 | public function allowRetries() { |
| 126 | return false; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * @return bool |
| 131 | */ |
| 132 | protected function doJob() { |
| 133 | // While we can only have a single connection per job, we still |
| 134 | // use decideClusters() which includes a variety of safeguards. |
| 135 | $connections = $this->decideClusters(); |
| 136 | if ( empty( $connections ) ) { |
| 137 | // Chosen cluster no longer exists in configuration. |
| 138 | return true; |
| 139 | } |
| 140 | Assert::precondition( count( $connections ) == 1, |
| 141 | 'per self::build() we must have a single connection' ); |
| 142 | |
| 143 | $conn = reset( $connections ); |
| 144 | $arguments = self::serde( $this->params['method'], $this->params['arguments'], false ); |
| 145 | |
| 146 | LoggerFactory::getInstance( 'CirrusSearch' )->debug( |
| 147 | "Running {method} on cluster {cluster} {diff}s after insertion", |
| 148 | [ |
| 149 | 'method' => $this->params['method'], |
| 150 | 'arguments' => $arguments, |
| 151 | 'diff' => time() - $this->params['createdAt'], |
| 152 | 'cluster' => $conn->getClusterName(), |
| 153 | ] |
| 154 | ); |
| 155 | |
| 156 | $retry = []; |
| 157 | $error = []; |
| 158 | $sender = new DataSender( $conn, $this->searchConfig ); |
| 159 | try { |
| 160 | $status = $sender->{$this->params['method']}( ...$arguments ); |
| 161 | } catch ( \Exception $e ) { |
| 162 | LoggerFactory::getInstance( 'CirrusSearch' )->warning( |
| 163 | "Exception thrown while running DataSender::{method} in cluster {cluster}: {errorMessage}", |
| 164 | [ |
| 165 | 'method' => $this->params['method'], |
| 166 | 'cluster' => $conn->getClusterName(), |
| 167 | 'errorMessage' => $e->getMessage(), |
| 168 | 'exception' => $e, |
| 169 | ] |
| 170 | ); |
| 171 | $status = Status::newFatal( 'cirrussearch-send-failure' ); |
| 172 | } |
| 173 | |
| 174 | $ok = true; |
| 175 | if ( !$status->isOK() ) { |
| 176 | $action = $this->requeueError( $conn ) ? "Requeued" : "Dropped"; |
| 177 | $this->setLastError( "ElasticaWrite job failed: {$action}" ); |
| 178 | $ok = false; |
| 179 | } |
| 180 | |
| 181 | return $ok; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Re-queue job that failed, or drop the job if it has failed |
| 186 | * too many times |
| 187 | * |
| 188 | * @param Connection $conn |
| 189 | * @return bool True when the job has been queued |
| 190 | */ |
| 191 | private function requeueError( Connection $conn ) { |
| 192 | if ( $this->params['errorCount'] >= self::MAX_ERROR_RETRY ) { |
| 193 | LoggerFactory::getInstance( 'CirrusSearchChangeFailed' )->warning( |
| 194 | "Dropping failing ElasticaWrite job for DataSender::{method} in cluster {cluster} after repeated failure", |
| 195 | [ |
| 196 | 'method' => $this->params['method'], |
| 197 | 'cluster' => $conn->getClusterName(), |
| 198 | ] |
| 199 | ); |
| 200 | return false; |
| 201 | } else { |
| 202 | $delay = $this->backoffDelay( $this->params['retryCount'] ); |
| 203 | $params = $this->params; |
| 204 | $params['errorCount']++; |
| 205 | unset( $params['jobReleaseTimestamp'] ); |
| 206 | $params += self::buildJobDelayOptions( self::class, $delay ); |
| 207 | $job = new self( $params ); |
| 208 | // Individual failures should have already logged specific errors, |
| 209 | LoggerFactory::getInstance( 'CirrusSearch' )->info( |
| 210 | "ElasticaWrite job reported failure on cluster {cluster}. Requeueing job with delay of {delay}.", |
| 211 | [ |
| 212 | 'cluster' => $conn->getClusterName(), |
| 213 | 'delay' => $delay |
| 214 | ] |
| 215 | ); |
| 216 | MediaWikiServices::getInstance()->getJobQueueGroup()->push( $job ); |
| 217 | return true; |
| 218 | } |
| 219 | } |
| 220 | } |