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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5350) Ensure LocalScheduler does not lose the sort order of allocatable nodes returned by the RM
Date Wed, 20 Jul 2016 05:59:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15385410#comment-15385410
] 

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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