Race condition in command-line kill for a task
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Key: HADOOP-5473
URL: https://issues.apache.org/jira/browse/HADOOP-5473
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Amareshwari Sriramadasu
Assignee: Amareshwari Sriramadasu
The race condition occurs in following sequence of events:
1. User issues a command-line kill for a RUNNING map-task. JT stores the task
in tasksToKill mapping.
2. TT reports the task status as SUCCEEDED.
3. JT creates a TaskCompletionEvent as SUCCEEDED. Also sends a killTaskAction.
4. Reducers fail fetching the map output.
5. finally, the task would fail with Fetch failures. After HADOOP-4759, the
task is left as FAILED_UNCLEAN task, since the task is present in tasksToKill
mapping.
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