runningMapTasks counter is not decremented in case of failed task-cleanup tasks.
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Key: MAPREDUCE-3892
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3892
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv1
Affects Versions: 1.0.0
Environment: Hadoop 1.0.0
Reporter: Liyin Liang
For a map-only job, a map task has two running attempts: attempt_0 and
attempt_1 (speculative task). If attempt_0 completes first, then this map task
is complete and attempt_1 is killed. Also a task-cleanup task will be launched
to clean attempt_1's output. If the TaskTracker is lost while the task-cleanup
task is running, the attempt_1 will remain KILLED_UNCLEAN status. Whats' more
runningMapTasks equals one instead of zero after the job is finished.
The incorrect runningMapTasks value can lead to bad scheduling decisions with
our scheduler.
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