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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2630) MR-279: refreshQueues leads to NPEs when used w/FifoScheduler
Date Wed, 29 Jun 2011 06:39:28 GMT
MR-279: refreshQueues leads to NPEs when used w/FifoScheduler

                 Key: MAPREDUCE-2630
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2630
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
         Environment: All
            Reporter: Josh Wills
            Priority: Minor

The RM's admin service exposes a method refreshQueues that is used to update the queue configuration
when used with the CapacityScheduler, but if it is used with the FifoScheduler, it will set
the containerTokenSecretManager/clusterTracker fields on the FifoScheduler to null, which
eventually leads to NPE. Since the FifoScheduler only has one queue that cannot be refreshed,
the correct behavior is for the refreshQueues call to be a no-op.

I will attach a patch that fixes this by splitting the ResourceScheduler's reinitialize method
into separate initialize/updateQueues methods.

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