From: Aaron Schulz <aschulz@wikimedia.org>
Date: Wed, 8 Apr 2015 22:47:58 +0000 (-0700)
Subject: Warn when jobs do large DB writes at once
X-Git-Tag: 1.31.0-rc.0~11772^2
X-Git-Url: http://git.cyclocoop.org/%7B%24www_url%7Dadmin/compta/operations/?a=commitdiff_plain;h=fcb0872e8b0ec03f78a0f1094a5205c83dd52d45;p=lhc%2Fweb%2Fwiklou.git

Warn when jobs do large DB writes at once

Change-Id: I57e9bb630accd5b262188ab16b17b558cd3a2bc1
---

diff --git a/includes/jobqueue/JobRunner.php b/includes/jobqueue/JobRunner.php
index b8c5d6cf78..f808a324cc 100644
--- a/includes/jobqueue/JobRunner.php
+++ b/includes/jobqueue/JobRunner.php
@@ -117,6 +117,11 @@ class JobRunner implements LoggerAwareInterface {
 			return $response;
 		}
 
+		// Catch huge single updates that lead to slave lag
+		$trxProfiler = Profiler::instance()->getTransactionProfiler();
+		$trxProfiler->setLogger( LoggerFactory::getInstance( 'DBPerformance' ) );
+		$trxProfiler->setExpectation( 'maxAffected', 500, __METHOD__ );
+
 		// Bail out if there is too much DB lag
 		list( , $maxLag ) = wfGetLBFactory()->getMainLB( wfWikiID() )->getMaxLag();
 		if ( $maxLag >= 5 ) {