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https://issues.apache.org/jira/browse/YARN-9448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867787#comment-16867787
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Abhishek Modi commented on YARN-9448:
-------------------------------------
[~baktha] one of the ways to reproduce it is to ask for two O containers on a
two node cluster:
# any (no preference)
# node local container on node 1.
Without this patch, there is 50% probability that 2nd container won't get on
node 1.
> Fix Opportunistic Scheduling for node local allocations.
> --------------------------------------------------------
>
> Key: YARN-9448
> URL: https://issues.apache.org/jira/browse/YARN-9448
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Abhishek Modi
> Assignee: Abhishek Modi
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: YARN-9448.001.patch, YARN-9448.002.patch,
> YARN-9448.003.patch, YARN-9448.004.patch
>
>
> Right now, opportunistic container might not get allocated on rack local node
> even if it's available.
> Nodes are right now blacklisted if any container except node local container
> is allocated on that node. In case, if previously container was allocated on
> that node, that node wouldn't be even considered even if there is an ask for
> node local request.
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