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https://issues.apache.org/jira/browse/YARN-5342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15376095#comment-15376095
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Wangda Tan commented on YARN-5342:
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[~Naganarasimha], that's a good point, actually I have thought about this while
working on the patch.
The only purpose of doing this is for simple, we could have some better logic
like gradually decrease the counter depends on ratio of #nodes in default
partition and #nodes in specific partitions, but they could be complex and
potentially can be a regression since we don't know what happened. Please share
your thoughts.
Thanks,
> Improve non-exclusive node partition resource allocation in Capacity Scheduler
> ------------------------------------------------------------------------------
>
> Key: YARN-5342
> URL: https://issues.apache.org/jira/browse/YARN-5342
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Attachments: YARN-5342.1.patch
>
>
> In the previous implementation, one non-exclusive container allocation is
> possible when the missed-opportunity >= #cluster-nodes. And
> missed-opportunity will be reset when container allocated to any node.
> This will slow down the frequency of container allocation on non-exclusive
> node partition: *When a non-exclusive partition=x has idle resource, we can
> only allocate one container for this app in every
> X=nodemanagers.heartbeat-interval secs for the whole cluster.*
> In this JIRA, I propose a fix to reset missed-opporunity only if we have >0
> pending resource for the non-exclusive partition OR we get allocation from
> the default partition.
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