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Posted to mapreduce-issues@hadoop.apache.org by "Anubhav Dhoot (JIRA)" <ji...@apache.org> on 2015/09/02 19:19:47 UTC
[jira] [Assigned] (MAPREDUCE-6302) deadlock in a job between map
and reduce cores allocation
[ https://issues.apache.org/jira/browse/MAPREDUCE-6302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Anubhav Dhoot reassigned MAPREDUCE-6302:
----------------------------------------
Assignee: Anubhav Dhoot (was: Karthik Kambatla)
> deadlock in a job between map and reduce cores allocation
> ----------------------------------------------------------
>
> Key: MAPREDUCE-6302
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6302
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: mai shurong
> Assignee: Anubhav Dhoot
> Priority: Critical
> Attachments: AM_log_head100000.txt.gz, AM_log_tail100000.txt.gz, log.txt, mr-6302-prelim.patch, queue_with_max163cores.png, queue_with_max263cores.png, queue_with_max333cores.png
>
>
> 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.
> I think there is the similar issue for memory of a queue .
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