From 6ca5e005e6288b1e7c65fdbcc046e8a057292912 Mon Sep 17 00:00:00 2001
From: Tim Starling <tstarling@users.mediawiki.org>
Date: Sun, 2 Oct 2005 00:08:07 +0000
Subject: [PATCH] Script to find missing revisions and copy them from the
 master to the slaves

---
 maintenance/fixSlaveDesync.php | 93 ++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 maintenance/fixSlaveDesync.php

diff --git a/maintenance/fixSlaveDesync.php b/maintenance/fixSlaveDesync.php
new file mode 100644
index 0000000000..a6eb368f35
--- /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";
+}
+
+?>
-- 
2.20.1