Script to find missing revisions and copy them from the master to the slaves

diff --git a/maintenance/fixSlaveDesync.php b/maintenance/fixSlaveDesync.php
new file mode 100644 (file)
index 0000000..a6eb368
--- /dev/null
+++ b/maintenance/fixSlaveDesync.php
@@ -0,0 +1,93 @@
+<?
+
+$wgUseRootUser = true;
+require_once( 'commandLine.inc' );
+
+//$wgDebugLogFile = '/dev/stdout';
+
+$numServers = count( $wgDBservers );
+/*
+foreach ( $wgLoadBalancer->mServers as $i => $server ) {
+       $wgLoadBalancer->mServers[$i]['flags'] |= DBO_DEBUG;
+}*/
+define( 'REPORTING_INTERVAL', 1000 );
+
+if ( isset( $args[0] ) ) {
+       desyncFixPage( $args[0] );
+} else {
+       $dbw =& wfGetDB( DB_MASTER );
+       $maxPage = $dbw->selectField( 'page', 'MAX(page_id)', false, 'fixDesync.php' );
+       for ( $i=1; $i <= $maxPage; $i++ ) {
+               desyncFixPage( $i );
+               if ( !($i % REPORTING_INTERVAL) ) {
+                       print "$i\n";
+               }
+       }
+}
+
+function desyncFixPage( $pageID ) {
+       global $numServers;
+       $fname = 'desyncFixPage';
+       
+       # Check for a corrupted page_latest
+       $dbw =& wfGetDB( DB_MASTER );
+       $realLatest = $dbw->selectField( 'page', 'page_latest', array( 'page_id' => $pageID ), $fname );
+       for ( $i = 1; $i < $numServers; $i++ ) {
+               $db =& wfGetDB( $i );
+               $latest = $db->selectField( 'page', 'page_latest', array( 'page_id' => $pageID ), $fname );
+               $max = $db->selectField( 'revision', 'MAX(rev_id)', false, $fname );
+               if ( $latest != $realLatest && $realLatest < $max ) {
+                       print "page_latest corrupted in page $pageID, server $i\n";
+                       break;
+               }
+       }
+       if ( $i == $numServers ) {
+               return;
+       }
+       
+       # Find the missing revision
+       $res = $dbw->select( 'revision', array( 'rev_id' ), array( 'rev_page' => $pageID ), $fname );
+       $masterIDs = array();
+       while ( $row = $dbw->fetchObject( $res ) ) {
+               $masterIDs[] = $row->rev_id;
+       }
+       $dbw->freeResult( $res );
+       
+       $res = $db->select( 'revision', array( 'rev_id' ), array( 'rev_page' => $pageID ), $fname );
+       $slaveIDs = array();
+       while ( $row = $db->fetchObject( $res ) ) {
+               $slaveIDs[] = $row->rev_id;
+       }
+       $db->freeResult( $res );
+       $missingIDs = array_diff( $masterIDs, $slaveIDs );
+
+       if ( count( $missingIDs ) ) {
+               print "Found " . count( $missingIDs ) . " missing revision(s), copying from master... ";
+               foreach ( $missingIDs as $rid ) {
+                       print "$rid ";
+                       # Revision
+                       $row = $dbw->selectRow( 'revision', '*', array( 'rev_id' => $rid ), $fname );
+                       for ( $i = 1; $i < $numServers; $i++ ) {
+                               $db =& wfGetDB( $i );
+                               $db->insert( 'revision', get_object_vars( $row ), $fname, 'IGNORE' );
+                       }
+
+                       # Text
+                       $row = $dbw->selectRow( 'text', '*', array( 'old_id' => $row->rev_text_id ), $fname );
+                       for ( $i = 1; $i < $numServers; $i++ ) {
+                               $db =& wfGetDB( $i );
+                               $db->insert( 'text', get_object_vars( $row ), $fname, 'IGNORE' );
+                       }
+               }
+               print "done\n";
+       }
+
+       print "Fixing page_latest... ";
+       for ( $i = 1; $i < $numServers; $i++ ) {
+               $db =& wfGetDB( $i );
+               $db->update( 'page', array( 'page_latest' => $realLatest ), array( 'page_id' => $pageID ), $fname );
+       }
+       print "done\n";
+}
+
+?>