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From "Rohith (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3416) deadlock in a job between map and reduce cores allocation
Date Mon, 30 Mar 2015 04:34:53 GMT

    [ https://issues.apache.org/jira/browse/YARN-3416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386179#comment-14386179
] 

Rohith commented on YARN-3416:
------------------------------

Would you mind attaching AM logs?

> deadlock in a job between map and reduce cores allocation 
> ----------------------------------------------------------
>
>                 Key: YARN-3416
>                 URL: https://issues.apache.org/jira/browse/YARN-3416
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.6.0
>            Reporter: mai shurong
>
> I submit a  big job, which has 500 maps and 350 reduce, to a queue(fairscheduler) with
300 max cores. When the big mapreduce job is running 100% maps, the 300 reduces have occupied
300 max cores in the queue. And then, a map fails and retry, waiting for a core, while the
300 reduces are waiting for failed map to finish. So a deadlock occur. As a result, the job
is blocked, and the later job in the queue cannot run because no available cores in the queue.



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