Joe Mudd created MAPREDUCE-5860:
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Summary: Hadoop pipes Combiner is closed before all of its reduce
calls
Key: MAPREDUCE-5860
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5860
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: pipes
Affects Versions: 0.23.0
Environment: 0.23.0 on 64 bit linux
Reporter: Joe Mudd
Priority: Minor
When a Combiner is specified to runTask() its reduce() method may be called
after its close() method has been called due to how the Combiner's containing
object, CombineRunner, is closed after the TaskContextImpl's reducer member is
closed (see TaskContextImpl::closeAll()).
I believe the fix is to delegate the Combiner's ownership to CombineRunner,
making it responsible for calling the Combiner's close() method and deleting
the Combiner instance.
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