When reducers are complete, trailing mappers delay job completion
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Key: MAPREDUCE-2857
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2857
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Adam Kramer
Priority: Minor
Sometimes, mappers restart themselves for some reason (there are several
reasons, for example, because it has lost access to the data it generated which
a reducer may later need.). However, not all reducers will depend on that
mapper. Accordingly, jobs can get into a state in which all reducers have
completed but some mappers are still running. This is a bug--when the reducers
have completed, the job should be marked as completed immediately and any
trailing map tasks killed.
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