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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2857

When reducers are complete, trailing mappers delay job completion

    Details

    • Type: Bug
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
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      Description

      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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            • Assignee:
              Unassigned
              Reporter:
              akramer Adam Kramer
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              • Created:
                Updated: