updated to MediaWiki 1.14.0

1 files changed, 316 insertions, 0 deletions

diff --git a/maintenance/storage/trackBlobs.php b/maintenance/storage/trackBlobs.php
new file mode 100644
index 00000000..b13faa00
--- /dev/null
+++ b/maintenance/storage/trackBlobs.php
@@ -0,0 +1,316 @@
+<?php
+
+require( dirname( __FILE__ ) .'/../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->trackBlobs();
+
+class TrackBlobs {
+	var $clusters, $textClause;
+	var $doBlobOrphans;
+	var $trackedBlobs = array();
+
+	var $batchSize = 1000;
+	var $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 trackBlobs() {
+		$this->initTrackingTable();
+		$this->trackRevisions();
+		$this->trackOrphanText();
+		if ( $this->doBlobOrphans ) {
+			$this->findOrphanBlobs();
+		}
+	}
+
+	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' ) );
+		}
+		$dbw->sourceFile( dirname( __FILE__ ) . '/blob_tracking.sql' );
+	}
+
+	function getTextClause() {
+		if ( !$this->textClause ) {
+			$dbr = wfGetDB( DB_SLAVE );
+			$this->textClause = '';
+			foreach ( $this->clusters as $cluster ) {
+				if ( $this->textClause != '' ) {
+					$this->textClause .= ' OR ';
+				}
+				$this->textClause .= 'old_text LIKE ' . $dbr->addQuotes( $dbr->escapeLike( "DB://$cluster/" ) . '%' );
+			}
+		}
+		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[2] : 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 LIKE '%external%'",
+				),
+				__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( 5 );
+			}
+		}
+		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 LIKE '%external%'",
+					'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( 5 );
+			}
+		}
+		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;
+			}
+			$startId = 0;
+			$batchesDone = 0;
+			$actualBlobs = gmp_init( 0 );
+			$endId = $extDB->selectField( 'blobs', 'MAX(blob_id)', false, __METHOD__ );
+
+			// Build a bitmap of actual blob rows
+			while ( true ) {
+				$res = $extDB->select( 'blobs', 
+					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;
+			while ( true ) {
+				$id = gmp_scan1( $orphans, $id );
+				if ( $id == -1 ) {
+					break;
+				}
+				$insertBatch[] = array(
+					'bo_cluster' => $cluster,
+					'bo_blob_id' => $id
+				);
+				++$id;
+			}
+
+			// Insert the batch
+			echo "Found " . count( $insertBatch ) . " orphan(s) in $cluster\n";
+			$dbw->insert( 'blob_orphans', $insertBatch, __METHOD__ );
+		}
+	}
+}