MR-279: refreshQueues leads to NPEs when used w/FifoScheduler
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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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