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From "Robert Joseph Evans (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3972) Locking and exception issues in JobHistory Server.
Date Mon, 05 Mar 2012 19:23:58 GMT
Locking and exception issues in JobHistory Server.
--------------------------------------------------

                 Key: MAPREDUCE-3972
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3972
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.2
            Reporter: Robert Joseph Evans
            Assignee: Robert Joseph Evans


The JobHistory server's locking is inconsistent and wrong in some cases.  This is not super
critical because the issues would only show up if a job is being cleaned up or moved from
intermediate done to done, at the same time it is being parsed into a CompletedJob.  However
the locking is slowing down the server in some cases, and is a ticking time bomb that needs
to be addressed.

As part of this too we need to be sure that the Cleaner and Intermediate to Done migration
threads handle exceptions properly.  Now it appears that the exception is logged, and the
thread just shuts down.  This means that the history server could still be up and running
for weeks and never remove old jobs.  

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