|
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
|
|
|
/** |
|
29
|
|
|
* Maintenance script to run a database query in batches and wait for replica DBs. |
|
30
|
|
|
* |
|
31
|
|
|
* @ingroup Maintenance |
|
32
|
|
|
*/ |
|
33
|
|
|
class BatchedQueryRunner extends Maintenance { |
|
34
|
|
|
public function __construct() { |
|
35
|
|
|
parent::__construct(); |
|
36
|
|
|
$this->addDescription( |
|
37
|
|
|
"Run a query repeatedly until it affects 0 rows, and wait for replica DBs in between.\n" . |
|
38
|
|
|
"NOTE: You need to set a LIMIT clause yourself." ); |
|
39
|
|
|
} |
|
40
|
|
|
|
|
41
|
|
|
public function execute() { |
|
42
|
|
|
if ( !$this->hasArg() ) { |
|
43
|
|
|
$this->error( "No query specified. Specify the query as a command line parameter.", true ); |
|
44
|
|
|
} |
|
45
|
|
|
|
|
46
|
|
|
$query = $this->getArg(); |
|
47
|
|
|
$n = 1; |
|
48
|
|
|
$dbw = $this->getDB( DB_MASTER ); |
|
49
|
|
|
do { |
|
50
|
|
|
$this->output( "Batch $n: " ); |
|
51
|
|
|
$n++; |
|
52
|
|
|
$dbw->query( $query, __METHOD__ ); |
|
53
|
|
|
$affected = $dbw->affectedRows(); |
|
54
|
|
|
$this->output( "$affected rows\n" ); |
|
55
|
|
|
wfWaitForSlaves(); |
|
|
|
|
|
|
56
|
|
|
} while ( $affected > 0 ); |
|
57
|
|
|
} |
|
58
|
|
|
|
|
59
|
|
|
public function getDbType() { |
|
60
|
|
|
return Maintenance::DB_ADMIN; |
|
61
|
|
|
} |
|
62
|
|
|
} |
|
63
|
|
|
|
|
64
|
|
|
$maintClass = "BatchedQueryRunner"; |
|
65
|
|
|
require_once RUN_MAINTENANCE_IF_MAIN; |
|
66
|
|
|
|
wikimedia /
mediawiki
Loading history...
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.