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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5350) Distributed Scheduling: Ensure sort order of allocatable nodes returned by the RM is not lost
Date Wed, 20 Jul 2016 08:07:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15385522#comment-15385522
] 

Hudson commented on YARN-5350:
------------------------------

ABORTED: Integrated in Hadoop-trunk-Commit #10122 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/10122/])
YARN-5350. Distributed Scheduling: Ensure sort order of allocatable (arun suresh: rev 8fbe6ece24e38ee24fee0abdbed5f7dc5d3c16da)
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/scheduler/LocalScheduler.java
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/scheduler/TestLocalScheduler.java


> 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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