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https://issues.apache.org/jira/browse/YARN-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun Suresh updated YARN-5350:
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Summary: Distributed Scheduling: Ensure sort order of allocatable nodes
returned by the RM is not lost (was: Ensure LocalScheduler does not lose the
sort order of allocatable nodes returned by the RM)
> Distributed Scheduling: Ensure sort order of allocatable nodes returned by
> the RM is not lost
> ---------------------------------------------------------------------------------------------
>
> 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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