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https://issues.apache.org/jira/browse/MAPREDUCE-2217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905447#comment-13905447
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Grigory Turunov commented on MAPREDUCE-2217:
--------------------------------------------
Bob,
Are you sure that your tasks are not launching? In our case, task status
changes to "Error launching task", but it continues to work on TT - and can
calculate some results successfully (or in case of same output name for
attempts partially overwrite output for next attempt - and both are usually end
up in failed status).
In the same time, JT thinks that first attempt not exists anymore - and when TT
tries to send heartbeat to JT, it writes to log "Serious problem. While
updating status, cannot find taskid", but do nothing.
> The expire launching task should cover the UNASSIGNED task
> ----------------------------------------------------------
>
> Key: MAPREDUCE-2217
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2217
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.23.0, 1.1.1
> Reporter: Scott Chen
> Assignee: Karthik Kambatla
> Fix For: 1.2.0
>
> Attachments: MAPREDUCE-2217.1.txt, MR-2217.patch, MR-2217.patch,
> expose-bug-mr-2217.patch
>
>
> The ExpireLaunchingTask thread kills the task that are scheduled but not
> responded.
> Currently if a task is scheduled on tasktracker and for some reason
> tasktracker cannot put it to RUNNING.
> The task will just hang in the UNASSIGNED status and JobTracker will keep
> waiting for it.
> JobTracker.ExpireLaunchingTask should be able to kill this task.
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