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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