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Posted to mapreduce-dev@hadoop.apache.org by "Siddharth Seth (JIRA)" <ji...@apache.org> on 2012/07/10 21:08:34 UTC

[jira] [Created] (MAPREDUCE-4425) Speculation + Fetch failures can lead to a hung job

Siddharth Seth created MAPREDUCE-4425:
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             Summary: Speculation + Fetch failures can lead to a hung job
                 Key: MAPREDUCE-4425
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4425
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mrv2
    Affects Versions: 0.23.1
            Reporter: Siddharth Seth


After a task goes to SUCCEEDED, FAILED/KILLED attempts are ignored.
1. attemp1 starts
2. speculative attempt starts
3. attempt 1 completes - Task moves to SUCCEEDED state
4. speculative attempt is KILLED
5. T_ATTEMPT_KILLED is ignored.
6. attemp1 1 fails with TOO_MANY_FETCH_FAILURES
The job will effectively hang, since a new task attempt isn't started.

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