[ https://issues.apache.org/jira/browse/MAPREDUCE-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Amareshwari Sriramadasu updated MAPREDUCE-1342: ----------------------------------------------- Status: Patch Available (was: Open) > Potential JT deadlock in faulty TT tracking > ------------------------------------------- > > Key: MAPREDUCE-1342 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-1342 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: jobtracker > Affects Versions: 0.20.1 > Reporter: Todd Lipcon > Assignee: Amareshwari Sriramadasu > Fix For: 0.21.0 > > Attachments: cycle0.png, mapreduce-1342-1.patch, > mapreduce-1342-2.patch, patch-1342-1.txt, patch-1342-ydist.txt, patch-1342.txt > > > JT$FaultyTrackersInfo.incrementFaults first locks potentiallyFaultyTrackers, > and then calls blackListTracker, which calls removeHostCapacity, which locks > JT.taskTrackers > On the other hand, JT.blacklistedTaskTrackers() locks taskTrackers, then > calls faultyTrackers.isBlacklisted() which goes on to lock > potentiallyFaultyTrackers. > I haven't produced such a deadlock, but the lock ordering here is inverted > and therefore could deadlock. > Not sure if this goes back to 0.21 or just in trunk. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.