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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4328) Add the option to quiesce the JobTracker
Date Wed, 22 Aug 2012 21:34:42 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13439865#comment-13439865
] 

Aaron T. Myers commented on MAPREDUCE-4328:
-------------------------------------------

Thanks a lot for the explanation, Arun. Makes sense.
                
> Add the option to quiesce the JobTracker
> ----------------------------------------
>
>                 Key: MAPREDUCE-4328
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4328
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv1
>    Affects Versions: 1.0.3
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 1.2.0
>
>         Attachments: MAPREDUCE-4328.patch, MAPREDUCE-4328.patch, TestJobTrackerQuiescence.java
>
>
> In several failure scenarios it would be very handy to have an option to quiesce the
JobTracker.
> Recently, we saw a case where the NameNode had to be rebooted at a customer due to a
random hardware failure - in such a case it would have been nice to not lose jobs by quiescing
the JobTracker.

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