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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1436) Deadlock in preemption code in fair scheduler
Date Mon, 01 Feb 2010 19:58:18 GMT
Deadlock in preemption code in fair scheduler
---------------------------------------------

                 Key: MAPREDUCE-1436
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1436
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: contrib/fair-share
    Affects Versions: 0.21.0, 0.22.0
            Reporter: Matei Zaharia
            Assignee: Matei Zaharia
            Priority: Blocker


In testing the fair scheduler with preemption, I found a deadlock between updatePreemptionVariables
and some code in the JobTracker. This was found while testing a backport of the fair scheduler
to Hadoop 0.20, but it looks like it could also happen in trunk and 0.21. Details are in a
comment below.

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