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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1342) Potential JT deadlock in faulty TT tracking
Date Tue, 29 Dec 2009 02:06:29 GMT
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: 0.22.0
            Reporter: Todd Lipcon


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.

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