map tasks timeout during sorting
--------------------------------
Key: MAPREDUCE-2187
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2187
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 0.20.2
Reporter: Gianmarco De Francisci Morales
During the execution of a large job, the map tasks timeout:
{code}
INFO mapred.JobClient: Task Id : attempt_201010290414_60974_m_000057_1, Status
: FAILED
Task attempt_201010290414_60974_m_000057_1 failed to report status for 609
seconds. Killing!
{code}
The bug is in the fact that the mapper has already finished, and, according to
the logs, the timeout occurs during the merge sort phase.
The intermediate data generated by the map task is quite large. So I think this
is the problem.
The logs show that the merge-sort was running for 10 minutes when the task was
killed.
I think the mapred.Merger should call Reporter.progress() somewhere.
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