Race condition in removing a KILLED task from tasktracker
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Key: HADOOP-2016
URL: https://issues.apache.org/jira/browse/HADOOP-2016
Project: Hadoop
Issue Type: Bug
Components: mapred
Reporter: Devaraj Das
Priority: Critical
Fix For: 0.15.0
I ran into a situation where a speculative task was killed by the JobTracker
and the relevant TaskTracker got the right KillTaskAction, but the tasktracker
continued to hold a reference to that task (although the task jvm was killed).
The task continued to be in RUNNING state in both the JobTracker and that
TaskTracker for ever. I suspect there is some race condition in
reading/updating datastructures inside the taskCleanupThread &
transmitHeartBeat.
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