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| 1 | <?php |
| 2 | /** |
| 3 | * Run a database query in batches and wait for replica DBs. This is used on large |
| 4 | * wikis to prevent replication lag from going through the roof when executing |
| 5 | * large write queries. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 20 | * http://www.gnu.org/copyleft/gpl.html |
| 21 | * |
| 22 | * @file |
| 23 | * @ingroup Maintenance |
| 24 | */ |
| 25 | |
| 26 | // @codeCoverageIgnoreStart |
| 27 | require_once __DIR__ . '/Maintenance.php'; |
| 28 | // @codeCoverageIgnoreEnd |
| 29 | |
| 30 | use MediaWiki\Maintenance\Maintenance; |
| 31 | use Wikimedia\Rdbms\Platform\ISQLPlatform; |
| 32 | |
| 33 | /** |
| 34 | * Maintenance script to run a database query in batches and wait for replica DBs. |
| 35 | * |
| 36 | * @ingroup Maintenance |
| 37 | */ |
| 38 | class RunBatchedQuery extends Maintenance { |
| 39 | public function __construct() { |
| 40 | parent::__construct(); |
| 41 | $this->addDescription( |
| 42 | "Run an update query on all rows of a table. " . |
| 43 | "Waits for replicas at appropriate intervals." ); |
| 44 | $this->addOption( 'table', 'The table name', true, true ); |
| 45 | $this->addOption( 'set', 'The SET clause', true, true ); |
| 46 | $this->addOption( 'where', 'The WHERE clause', false, true ); |
| 47 | $this->addOption( 'key', 'A column name, the values of which are unique', true, true ); |
| 48 | $this->addOption( 'batch-size', 'The batch size (default 1000)', false, true ); |
| 49 | $this->addOption( 'db', 'The database name, or omit to use the current wiki.', false, true ); |
| 50 | } |
| 51 | |
| 52 | public function execute() { |
| 53 | $table = $this->getOption( 'table' ); |
| 54 | $key = $this->getOption( 'key' ); |
| 55 | $set = $this->getOption( 'set' ); |
| 56 | $where = $this->getOption( 'where', null ); |
| 57 | $where = $where === null ? [] : [ $where ]; |
| 58 | $batchSize = $this->getOption( 'batch-size', 1000 ); |
| 59 | |
| 60 | $dbName = $this->getOption( 'db', null ); |
| 61 | if ( $dbName === null ) { |
| 62 | $dbw = $this->getPrimaryDB(); |
| 63 | } else { |
| 64 | $dbw = $this->getServiceContainer()->getConnectionProvider()->getPrimaryDatabase( $dbName ); |
| 65 | } |
| 66 | |
| 67 | $selectConds = $where; |
| 68 | $prevEnd = false; |
| 69 | |
| 70 | $n = 1; |
| 71 | do { |
| 72 | $this->output( "Batch $n: " ); |
| 73 | $n++; |
| 74 | |
| 75 | // Note that the update conditions do not rely on the atomicity of the |
| 76 | // SELECT query in order to guarantee that all rows are updated. The |
| 77 | // results of the SELECT are merely a partitioning hint. Simultaneous |
| 78 | // updates merely result in the wrong number of rows being updated |
| 79 | // in a batch. |
| 80 | |
| 81 | $res = $dbw->newSelectQueryBuilder() |
| 82 | ->select( $key ) |
| 83 | ->from( $table ) |
| 84 | ->where( $selectConds ) |
| 85 | ->orderBy( $key ) |
| 86 | ->limit( $batchSize ) |
| 87 | ->caller( __METHOD__ ) |
| 88 | ->fetchResultSet(); |
| 89 | |
| 90 | if ( $res->numRows() ) { |
| 91 | $res->seek( $res->numRows() - 1 ); |
| 92 | $row = $res->fetchObject(); |
| 93 | $end = $row->$key; |
| 94 | $selectConds = array_merge( $where, [ $dbw->expr( $key, '>', $end ) ] ); |
| 95 | $updateConds = array_merge( $where, [ $dbw->expr( $key, '<=', $end ) ] ); |
| 96 | } else { |
| 97 | $updateConds = $where; |
| 98 | $end = false; |
| 99 | } |
| 100 | if ( $prevEnd !== false ) { |
| 101 | $updateConds = array_merge( [ $dbw->expr( $key, '>', $prevEnd ) ], $updateConds ); |
| 102 | } |
| 103 | |
| 104 | $query = "UPDATE " . $dbw->tableName( $table ) . |
| 105 | " SET " . $set . |
| 106 | " WHERE " . $dbw->makeList( $updateConds, ISQLPlatform::LIST_AND ); |
| 107 | |
| 108 | $dbw->query( $query, __METHOD__ ); |
| 109 | |
| 110 | $prevEnd = $end; |
| 111 | |
| 112 | $affected = $dbw->affectedRows(); |
| 113 | $this->output( "$affected rows affected\n" ); |
| 114 | $this->waitForReplication(); |
| 115 | } while ( $res->numRows() ); |
| 116 | } |
| 117 | |
| 118 | public function getDbType() { |
| 119 | return Maintenance::DB_ADMIN; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | // @codeCoverageIgnoreStart |
| 124 | $maintClass = RunBatchedQuery::class; |
| 125 | require_once RUN_MAINTENANCE_IF_MAIN; |
| 126 | // @codeCoverageIgnoreEnd |