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https://issues.apache.org/jira/browse/MAPREDUCE-6302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081625#comment-17081625
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zhoukang edited comment on MAPREDUCE-6302 at 4/12/20, 3:14 AM:
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Nice catch,we also encountered this problem.Thanks [~shurong.mai]
was (Author: cane):
Nice catch,we also encounter this problem.Thanks [~shurong.mai]
> Preempt reducers after a configurable timeout irrespective of headroom
> ----------------------------------------------------------------------
>
> 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: Shurong Mai
> Assignee: Karthik Kambatla
> Priority: Critical
> Fix For: 2.8.0, 2.7.3, 2.6.5, 3.0.0-alpha1
>
> Attachments: AM_log_head100000.txt.gz, AM_log_tail100000.txt.gz,
> MAPREDUCE-6302.branch-2.6.0001.patch, MAPREDUCE-6302.branch-2.7.0001.patch,
> log.txt, mr-6302-1.patch, mr-6302-2.patch, mr-6302-3.patch, mr-6302-4.patch,
> mr-6302-5.patch, mr-6302-6.patch, mr-6302-7.patch, mr-6302-prelim.patch,
> mr-6302_branch-2.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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