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From "Robert Joseph Evans (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3711) AppMaster recovery for Medium to large jobs take long time
Date Wed, 01 Feb 2012 22:47:54 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robert Joseph Evans updated MAPREDUCE-3711:

    Attachment: MR-3711.txt

OK I figured out the issue.  It appears that fs.rename on the local file system will create
parent directories for you, where as on HDFS it does not.  Also I found out that if there
is an error durring recover, it can cause the AM to fail, which does not result in another
retry.  I will try to reproduce the issue again, and file a JIRA for it.
> AppMaster recovery for Medium to large jobs take long time
> ----------------------------------------------------------
>                 Key: MAPREDUCE-3711
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3711
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Siddharth Seth
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>         Attachments: MR-3711.txt, MR-3711.txt
> Reported by [~karams]
> yarn.resourcemanager.am.max-retries=2
> Ran test cases with sort job on 350 scale having 16800 maps and 680 reduces -:
> 1. After 70 secs of Job Sumbission Am is killed using kill -9, around 3900 maps were
completed and 680 reduces were
> scheduled, Second AM got restart. Job got completed in 980 secs. AM took very less time
to recover.
> 2. After 150 secs of Job Sumbission AM is killed using kill -9, around 90% maps were
completed and 680 reduces were
> scheduled , Second AM got restart Job got completed in 1000 secs. AM got revocer.
> 3. After 150 secs of Job Sumbission AM as killed using kill -9, almost all maps were
completed and only 680 reduces
> were running, Recovery was too slow, AM was still revocering after 1hr :40 mis when I
killed the run.

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