Code Coverage |
||||||||||
Lines |
Functions and Methods |
Classes and Traits |
||||||||
| Total | |
0.00% |
0 / 56 |
|
0.00% |
0 / 3 |
CRAP | |
0.00% |
0 / 1 |
| RunBatchedQuery | |
0.00% |
0 / 53 |
|
0.00% |
0 / 3 |
56 | |
0.00% |
0 / 1 |
| __construct | |
0.00% |
0 / 10 |
|
0.00% |
0 / 1 |
2 | |||
| execute | |
0.00% |
0 / 42 |
|
0.00% |
0 / 1 |
30 | |||
| getDbType | |
0.00% |
0 / 1 |
|
0.00% |
0 / 1 |
2 | |||
| 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 | require_once __DIR__ . '/Maintenance.php'; |
| 27 | |
| 28 | use Wikimedia\Rdbms\Platform\ISQLPlatform; |
| 29 | |
| 30 | /** |
| 31 | * Maintenance script to run a database query in batches and wait for replica DBs. |
| 32 | * |
| 33 | * @ingroup Maintenance |
| 34 | */ |
| 35 | class RunBatchedQuery extends Maintenance { |
| 36 | public function __construct() { |
| 37 | parent::__construct(); |
| 38 | $this->addDescription( |
| 39 | "Run an update query on all rows of a table. " . |
| 40 | "Waits for replicas at appropriate intervals." ); |
| 41 | $this->addOption( 'table', 'The table name', true, true ); |
| 42 | $this->addOption( 'set', 'The SET clause', true, true ); |
| 43 | $this->addOption( 'where', 'The WHERE clause', false, true ); |
| 44 | $this->addOption( 'key', 'A column name, the values of which are unique', true, true ); |
| 45 | $this->addOption( 'batch-size', 'The batch size (default 1000)', false, true ); |
| 46 | $this->addOption( 'db', 'The database name, or omit to use the current wiki.', false, true ); |
| 47 | } |
| 48 | |
| 49 | public function execute() { |
| 50 | $table = $this->getOption( 'table' ); |
| 51 | $key = $this->getOption( 'key' ); |
| 52 | $set = $this->getOption( 'set' ); |
| 53 | $where = $this->getOption( 'where', null ); |
| 54 | $where = $where === null ? [] : [ $where ]; |
| 55 | $batchSize = $this->getOption( 'batch-size', 1000 ); |
| 56 | |
| 57 | $dbName = $this->getOption( 'db', null ); |
| 58 | if ( $dbName === null ) { |
| 59 | $dbw = $this->getPrimaryDB(); |
| 60 | } else { |
| 61 | $dbw = $this->getServiceContainer()->getConnectionProvider()->getPrimaryDatabase( $dbName ); |
| 62 | } |
| 63 | |
| 64 | $selectConds = $where; |
| 65 | $prevEnd = false; |
| 66 | |
| 67 | $n = 1; |
| 68 | do { |
| 69 | $this->output( "Batch $n: " ); |
| 70 | $n++; |
| 71 | |
| 72 | // Note that the update conditions do not rely on the atomicity of the |
| 73 | // SELECT query in order to guarantee that all rows are updated. The |
| 74 | // results of the SELECT are merely a partitioning hint. Simultaneous |
| 75 | // updates merely result in the wrong number of rows being updated |
| 76 | // in a batch. |
| 77 | |
| 78 | $res = $dbw->newSelectQueryBuilder() |
| 79 | ->select( $key ) |
| 80 | ->from( $table ) |
| 81 | ->where( $selectConds ) |
| 82 | ->orderBy( $key ) |
| 83 | ->limit( $batchSize ) |
| 84 | ->caller( __METHOD__ ) |
| 85 | ->fetchResultSet(); |
| 86 | |
| 87 | if ( $res->numRows() ) { |
| 88 | $res->seek( $res->numRows() - 1 ); |
| 89 | $row = $res->fetchObject(); |
| 90 | $end = $dbw->addQuotes( $row->$key ); |
| 91 | $selectConds = array_merge( $where, [ "$key > $end" ] ); |
| 92 | $updateConds = array_merge( $where, [ "$key <= $end" ] ); |
| 93 | } else { |
| 94 | $updateConds = $where; |
| 95 | $end = false; |
| 96 | } |
| 97 | if ( $prevEnd !== false ) { |
| 98 | $updateConds = array_merge( [ "$key > $prevEnd" ], $updateConds ); |
| 99 | } |
| 100 | |
| 101 | $query = "UPDATE " . $dbw->tableName( $table ) . |
| 102 | " SET " . $set . |
| 103 | " WHERE " . $dbw->makeList( $updateConds, ISQLPlatform::LIST_AND ); |
| 104 | |
| 105 | $dbw->query( $query, __METHOD__ ); |
| 106 | |
| 107 | $prevEnd = $end; |
| 108 | |
| 109 | $affected = $dbw->affectedRows(); |
| 110 | $this->output( "$affected rows affected\n" ); |
| 111 | $this->waitForReplication(); |
| 112 | } while ( $res->numRows() ); |
| 113 | } |
| 114 | |
| 115 | public function getDbType() { |
| 116 | return Maintenance::DB_ADMIN; |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | $maintClass = RunBatchedQuery::class; |
| 121 | require_once RUN_MAINTENANCE_IF_MAIN; |