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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2310) If we stop Job Tracker, Task Tracker is also getting stopped.
Date Sun, 04 Sep 2011 11:56:10 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096859#comment-13096859
] 

Harsh J commented on MAPREDUCE-2310:
------------------------------------

Hm, experimented a bit more here and I believe you should update the JIRA summaries and description
to illustrate the problem better.

The said problem of the TT crashing out _only_ occurs when the JobTracker has not completely
initialized and added in the specific TT node before its taken down. If the TT faced proper
initialization before the JT went down, you won't see this.

Patch is OK to me, since waitForProxy anyway waits internally (while the look implemented
doesn't seem to sleep). However, this would be fixing a very rare case where a JT is taken
down immediately for some reason, and not in case of general restarts. I suppose it is okay
to have the uninited TTs running anyway, like zombies awaiting their master… :)

> If we stop Job Tracker, Task Tracker is also getting stopped.
> -------------------------------------------------------------
>
>                 Key: MAPREDUCE-2310
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2310
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.2
>            Reporter: Devaraj K
>            Assignee: Devaraj K
>            Priority: Minor
>         Attachments: MAPREDUCE-2310.patch
>
>
> If we execute stop-jobtracker.sh for stopping Job Tracker, Task Tracker is also stopping.
> This is not applicable for the latest (trunk) code because stop-jobtracker.sh file is
not coming.

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