Jason Lowe created MAPREDUCE-5000:
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Summary: TaskImpl.getCounters() can return the counters for the
wrong task attempt when task is speculating
Key: MAPREDUCE-5000
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5000
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mr-am
Affects Versions: 0.23.6
Reporter: Jason Lowe
Priority: Critical
When a task is speculating and one attempt completes then sometimes the
counters for the wrong attempt are aggregated into the total counters for the
job. The scenario looks like this:
# Two task attempts are racing, _0 and _1
# _1 finishes first, causing the task to issue a TA_KILL to attempt _0
# _0 receives TA_KILL, sets progress to 1.0f and waits for container cleanup
# if TaskImpl.getCounters() is called now, TaskImpl.selectBestAttempt() can
return _0 since it is not quite yet in the KILLED state yet progress is maxed
out and no other attempt has more progress.
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