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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3837) Hadoop 22 Job tracker is not able to recover job in case of crash and after that no user can submit job.
Date Fri, 02 Mar 2012 23:18:54 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221344#comment-13221344

Konstantin Shvachko commented on MAPREDUCE-3837:

I've been reviewing this patch, and have a couple of cosmetic comments below.
I agree with Alejandro. This is not introducing new feature, it is just enabling already existing
feature. There is low risk, since the feature is enabled in a restricted context, that is
restarting failed jobs from scratch rather than trying to continue from the point they were
The patch seems to be larger than it actually is, because it is removing the [troubled] logic
responsible for resurrecting the job from its history. Besides that it is simple. Take a look,

Cosmetic comments
- Several lines are too long
- See several tabs - should be spaces
- indentation is wrong in couple of places
          shouldRecover = true; // enable actual recovery if num-files > 1
- Add spaces after commas in method calls and parameters
Otherwise it looks good. 
> Hadoop 22 Job tracker is not able to recover job in case of crash and after that no user
can submit job.
> --------------------------------------------------------------------------------------------------------
>                 Key: MAPREDUCE-3837
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3837
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.22.0
>            Reporter: Mayank Bansal
>            Assignee: Mayank Bansal
>             Fix For: 0.24.0, 0.22.1, 0.23.2
>         Attachments: PATCH-HADOOP-1-MAPREDUCE-3837-1.patch, PATCH-HADOOP-1-MAPREDUCE-3837.patch,
> If job tracker is crashed while running , and there were some jobs are running , so if
job tracker's property mapreduce.jobtracker.restart.recover is true then it should recover
the job.
> However the current behavior is as follows
> jobtracker try to restore the jobs but it can not . And after that jobtracker closes
its handle to hdfs and nobody else can submit job. 
> Thanks,
> Mayank

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