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https://issues.apache.org/jira/browse/YARN-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15385410#comment-15385410
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Arun Suresh commented on YARN-5350:
-----------------------------------
The test failure is unrelated..
checking this in based on [~subru]'s +1
> Ensure LocalScheduler does not lose the sort order of allocatable nodes
> returned by the RM
> ------------------------------------------------------------------------------------------
>
> Key: YARN-5350
> URL: https://issues.apache.org/jira/browse/YARN-5350
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Arun Suresh
> Assignee: Arun Suresh
> Fix For: 2.9.0
>
> Attachments: YARN-5350.001.patch, YARN-5350.002.patch,
> YARN-5350.003.patch
>
>
> The LocalScheduler receives an ordered list of nodes from the RM with each
> allocate call. This list, which is used by the LocalScheduler to allocate
> OPPORTUNISTIC containers, is sorted on the Nodes free capacity (queue length
> / wait time).
> Unfortunately, the LocalScheduler stores this list in a HashMap thereby
> losing the sort order.
> The trivial fix would be to replace the HashMap with a LinkedHashMap which
> retains the insertion order.
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