%PDF-
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Mini Shell
Mini Shell
<?php
/**
* Adds blobs from a given external storage cluster to the blob_tracking table.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Maintenance
* @see wfWaitForSlaves()
*/
require __DIR__ . '/../commandLine.inc';
if ( count( $args ) < 1 ) {
echo "Usage: php trackBlobs.php <cluster> [... <cluster>]\n";
echo "Adds blobs from a given ES cluster to the blob_tracking table\n";
echo "Automatically deletes the tracking table and starts from the start again when restarted.\n";
exit( 1 );
}
$tracker = new TrackBlobs( $args );
$tracker->run();
echo "All done.\n";
class TrackBlobs {
public $clusters, $textClause;
public $doBlobOrphans;
public $trackedBlobs = array();
public $batchSize = 1000;
public $reportingInterval = 10;
function __construct( $clusters ) {
$this->clusters = $clusters;
if ( extension_loaded( 'gmp' ) ) {
$this->doBlobOrphans = true;
foreach ( $clusters as $cluster ) {
$this->trackedBlobs[$cluster] = gmp_init( 0 );
}
} else {
echo "Warning: the gmp extension is needed to find orphan blobs\n";
}
}
function run() {
$this->checkIntegrity();
$this->initTrackingTable();
$this->trackRevisions();
$this->trackOrphanText();
if ( $this->doBlobOrphans ) {
$this->findOrphanBlobs();
}
}
function checkIntegrity() {
echo "Doing integrity check...\n";
$dbr = wfGetDB( DB_SLAVE );
// Scan for HistoryBlobStub objects in the text table (bug 20757)
$exists = $dbr->selectField( 'text', 1,
'old_flags LIKE \'%object%\' AND old_flags NOT LIKE \'%external%\' ' .
'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'',
__METHOD__
);
if ( $exists ) {
echo "Integrity check failed: found HistoryBlobStub objects in your text table.\n" .
"This script could destroy these objects if it continued. Run resolveStubs.php\n" .
"to fix this.\n";
exit( 1 );
}
// Scan the archive table for HistoryBlobStub objects or external flags (bug 22624)
$flags = $dbr->selectField( 'archive', 'ar_flags',
'ar_flags LIKE \'%external%\' OR (' .
'ar_flags LIKE \'%object%\' ' .
'AND LOWER(CONVERT(LEFT(ar_text,22) USING latin1)) = \'o:15:"historyblobstub"\' )',
__METHOD__
);
if ( strpos( $flags, 'external' ) !== false ) {
echo "Integrity check failed: found external storage pointers in your archive table.\n" .
"Run normaliseArchiveTable.php to fix this.\n";
exit( 1 );
} elseif ( $flags ) {
echo "Integrity check failed: found HistoryBlobStub objects in your archive table.\n" .
"These objects are probably already broken, continuing would make them\n" .
"unrecoverable. Run \"normaliseArchiveTable.php --fix-cgz-bug\" to fix this.\n";
exit( 1 );
}
echo "Integrity check OK\n";
}
function initTrackingTable() {
$dbw = wfGetDB( DB_MASTER );
if ( $dbw->tableExists( 'blob_tracking' ) ) {
$dbw->query( 'DROP TABLE ' . $dbw->tableName( 'blob_tracking' ) );
$dbw->query( 'DROP TABLE ' . $dbw->tableName( 'blob_orphans' ) );
}
$dbw->sourceFile( __DIR__ . '/blob_tracking.sql' );
}
function getTextClause() {
if ( !$this->textClause ) {
$dbr = wfGetDB( DB_SLAVE );
$this->textClause = '';
foreach ( $this->clusters as $cluster ) {
if ( $this->textClause != '' ) {
$this->textClause .= ' OR ';
}
$this->textClause .= 'old_text' . $dbr->buildLike( "DB://$cluster/", $dbr->anyString() );
}
}
return $this->textClause;
}
function interpretPointer( $text ) {
if ( !preg_match( '!^DB://(\w+)/(\d+)(?:/([0-9a-fA-F]+)|)$!', $text, $m ) ) {
return false;
}
return array(
'cluster' => $m[1],
'id' => intval( $m[2] ),
'hash' => isset( $m[3] ) ? $m[3] : null
);
}
/**
* Scan the revision table for rows stored in the specified clusters
*/
function trackRevisions() {
$dbw = wfGetDB( DB_MASTER );
$dbr = wfGetDB( DB_SLAVE );
$textClause = $this->getTextClause();
$startId = 0;
$endId = $dbr->selectField( 'revision', 'MAX(rev_id)', false, __METHOD__ );
$batchesDone = 0;
$rowsInserted = 0;
echo "Finding revisions...\n";
while ( true ) {
$res = $dbr->select( array( 'revision', 'text' ),
array( 'rev_id', 'rev_page', 'old_id', 'old_flags', 'old_text' ),
array(
'rev_id > ' . $dbr->addQuotes( $startId ),
'rev_text_id=old_id',
$textClause,
'old_flags ' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ),
),
__METHOD__,
array(
'ORDER BY' => 'rev_id',
'LIMIT' => $this->batchSize
)
);
if ( !$res->numRows() ) {
break;
}
$insertBatch = array();
foreach ( $res as $row ) {
$startId = $row->rev_id;
$info = $this->interpretPointer( $row->old_text );
if ( !$info ) {
echo "Invalid DB:// URL in rev_id {$row->rev_id}\n";
continue;
}
if ( !in_array( $info['cluster'], $this->clusters ) ) {
echo "Invalid cluster returned in SQL query: {$info['cluster']}\n";
continue;
}
$insertBatch[] = array(
'bt_page' => $row->rev_page,
'bt_rev_id' => $row->rev_id,
'bt_text_id' => $row->old_id,
'bt_cluster' => $info['cluster'],
'bt_blob_id' => $info['id'],
'bt_cgz_hash' => $info['hash']
);
if ( $this->doBlobOrphans ) {
gmp_setbit( $this->trackedBlobs[$info['cluster']], $info['id'] );
}
}
$dbw->insert( 'blob_tracking', $insertBatch, __METHOD__ );
$rowsInserted += count( $insertBatch );
++$batchesDone;
if ( $batchesDone >= $this->reportingInterval ) {
$batchesDone = 0;
echo "$startId / $endId\n";
wfWaitForSlaves();
}
}
echo "Found $rowsInserted revisions\n";
}
/**
* Scan the text table for orphan text
* Orphan text here does not imply DB corruption -- deleted text tracked by the
* archive table counts as orphan for our purposes.
*/
function trackOrphanText() {
# Wait until the blob_tracking table is available in the slave
$dbw = wfGetDB( DB_MASTER );
$dbr = wfGetDB( DB_SLAVE );
$pos = $dbw->getMasterPos();
$dbr->masterPosWait( $pos, 100000 );
$textClause = $this->getTextClause( $this->clusters );
$startId = 0;
$endId = $dbr->selectField( 'text', 'MAX(old_id)', false, __METHOD__ );
$rowsInserted = 0;
$batchesDone = 0;
echo "Finding orphan text...\n";
# Scan the text table for orphan text
while ( true ) {
$res = $dbr->select( array( 'text', 'blob_tracking' ),
array( 'old_id', 'old_flags', 'old_text' ),
array(
'old_id>' . $dbr->addQuotes( $startId ),
$textClause,
'old_flags ' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ),
'bt_text_id IS NULL'
),
__METHOD__,
array(
'ORDER BY' => 'old_id',
'LIMIT' => $this->batchSize
),
array( 'blob_tracking' => array( 'LEFT JOIN', 'bt_text_id=old_id' ) )
);
$ids = array();
foreach ( $res as $row ) {
$ids[] = $row->old_id;
}
if ( !$res->numRows() ) {
break;
}
$insertBatch = array();
foreach ( $res as $row ) {
$startId = $row->old_id;
$info = $this->interpretPointer( $row->old_text );
if ( !$info ) {
echo "Invalid DB:// URL in old_id {$row->old_id}\n";
continue;
}
if ( !in_array( $info['cluster'], $this->clusters ) ) {
echo "Invalid cluster returned in SQL query\n";
continue;
}
$insertBatch[] = array(
'bt_page' => 0,
'bt_rev_id' => 0,
'bt_text_id' => $row->old_id,
'bt_cluster' => $info['cluster'],
'bt_blob_id' => $info['id'],
'bt_cgz_hash' => $info['hash']
);
if ( $this->doBlobOrphans ) {
gmp_setbit( $this->trackedBlobs[$info['cluster']], $info['id'] );
}
}
$dbw->insert( 'blob_tracking', $insertBatch, __METHOD__ );
$rowsInserted += count( $insertBatch );
++$batchesDone;
if ( $batchesDone >= $this->reportingInterval ) {
$batchesDone = 0;
echo "$startId / $endId\n";
wfWaitForSlaves();
}
}
echo "Found $rowsInserted orphan text rows\n";
}
/**
* Scan the blobs table for rows not registered in blob_tracking (and thus not
* registered in the text table).
*
* Orphan blobs are indicative of DB corruption. They are inaccessible and
* should probably be deleted.
*/
function findOrphanBlobs() {
if ( !extension_loaded( 'gmp' ) ) {
echo "Can't find orphan blobs, need bitfield support provided by GMP.\n";
return;
}
$dbw = wfGetDB( DB_MASTER );
foreach ( $this->clusters as $cluster ) {
echo "Searching for orphan blobs in $cluster...\n";
$lb = wfGetLBFactory()->getExternalLB( $cluster );
try {
$extDB = $lb->getConnection( DB_SLAVE );
} catch ( DBConnectionError $e ) {
if ( strpos( $e->error, 'Unknown database' ) !== false ) {
echo "No database on $cluster\n";
} else {
echo "Error on $cluster: " . $e->getMessage() . "\n";
}
continue;
}
$table = $extDB->getLBInfo( 'blobs table' );
if ( is_null( $table ) ) {
$table = 'blobs';
}
if ( !$extDB->tableExists( $table ) ) {
echo "No blobs table on cluster $cluster\n";
continue;
}
$startId = 0;
$batchesDone = 0;
$actualBlobs = gmp_init( 0 );
$endId = $extDB->selectField( $table, 'MAX(blob_id)', false, __METHOD__ );
// Build a bitmap of actual blob rows
while ( true ) {
$res = $extDB->select( $table,
array( 'blob_id' ),
array( 'blob_id > ' . $extDB->addQuotes( $startId ) ),
__METHOD__,
array( 'LIMIT' => $this->batchSize, 'ORDER BY' => 'blob_id' )
);
if ( !$res->numRows() ) {
break;
}
foreach ( $res as $row ) {
gmp_setbit( $actualBlobs, $row->blob_id );
}
$startId = $row->blob_id;
++$batchesDone;
if ( $batchesDone >= $this->reportingInterval ) {
$batchesDone = 0;
echo "$startId / $endId\n";
}
}
// Find actual blobs that weren't tracked by the previous passes
// This is a set-theoretic difference A \ B, or in bitwise terms, A & ~B
$orphans = gmp_and( $actualBlobs, gmp_com( $this->trackedBlobs[$cluster] ) );
// Traverse the orphan list
$insertBatch = array();
$id = 0;
$numOrphans = 0;
while ( true ) {
$id = gmp_scan1( $orphans, $id );
if ( $id == -1 ) {
break;
}
$insertBatch[] = array(
'bo_cluster' => $cluster,
'bo_blob_id' => $id
);
if ( count( $insertBatch ) > $this->batchSize ) {
$dbw->insert( 'blob_orphans', $insertBatch, __METHOD__ );
$insertBatch = array();
}
++$id;
++$numOrphans;
}
if ( $insertBatch ) {
$dbw->insert( 'blob_orphans', $insertBatch, __METHOD__ );
}
echo "Found $numOrphans orphan(s) in $cluster\n";
}
}
}
Zerion Mini Shell 1.0