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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1612) listing of an output directory shortly after job completion fails
Date Sat, 21 Jul 2007 13:54:06 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12514412
] 

Arun C Murthy commented on HADOOP-1612:
---------------------------------------

Thanks for the info Christian...

bq. From this it looks as if the framework is still active with the output directory even
after job completion.

Ah, this is entirely feasible and here is how:
The job is declared as *success* as soon as all the {{TIP}}s are complete (and clearly at
this point all the successful sub-task files have been promoted), however there might still
be speculative tasks of the completed {{TIP}}s still active at this point. Hence when they
are killed (or succeed) the framework just discards their output files (the *_1* directories
in your logs)... which are precisely the logs you see.

Of course I'll keep poking and appreciate any info from you...

> listing of an output directory shortly after job completion fails
> -----------------------------------------------------------------
>
>                 Key: HADOOP-1612
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1612
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.14.0
>            Reporter: Christian Kunz
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.14.0
>
>
> Sometimes, after a job finishes, and another application wants to rename dfs files created
by that job, listing of the output directory containing the newly created files fails. File
creation and directory listing is done via libhdfs, but it is unlikely that this makes any
difference, therefore, I add this to the mapred component.
> It might be a race condition: does the job complete before the files in the output directory
are promoted?

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