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From "Robert Joseph Evans (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3274) Race condition in MR App Master Preemtion can cause a dead lock
Date Wed, 26 Oct 2011 20:49:32 GMT
Race condition in MR App Master Preemtion can cause a dead lock
---------------------------------------------------------------

                 Key: MAPREDUCE-3274
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3274
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2, scheduler
    Affects Versions: 0.23.0, 0.24.0
            Reporter: Robert Joseph Evans
            Assignee: Robert Joseph Evans
            Priority: Critical
             Fix For: 0.23.0, 0.24.0


There appears to be a race condition in the MR App Master in relation to preempting reducers
to let a mapper run.  In the particular case that I have been debugging a reducer was selected
for preemption that did not have a container assigned to it yet. When the container became
available that reduce started running and the previous TA_KILL event appears to have been
ignored.

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