reduce tasks stall and are eventually killed
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Key: MAPREDUCE-1308
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1308
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: tasktracker
Environment: 20-node cluster, 8 cores per machine, 32GB memory, Fedora
Linux
Reporter: Brian Karlak
We recently migrated our 0.19.2 cluster from Gentoo Linux to Fedora Linux.
Everything was running smoothly before, but now about 5%-10% of our jobs have
at least one reduce task that stalls out and is eventually killed with the
message:
Task attempt_200912102211_1648_r_000009_0 failed to report status for
6003 seconds. Killing!
The task is then re-launched and completes successfully, usually in a couple of
minutes.
This is problematic because our scheduled Hadoop jobs now take an extra
hour-and-a-half to run (6000 seconds).
There are no indications in the logs that anything is amiss. The task starts,
a small amount of the copy/shuffle runs, and then nothing is else is heard from
the task until it is killed. I will attach the relevant parts of the
TaskTracker logs in the comments.
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