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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8921) SnapshotBasedOverAllocationPolicy always caps the amount of memory availabe to 4 GBs
Date Thu, 25 Oct 2018 19:55:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16664227#comment-16664227
] 

Robert Kanter commented on YARN-8921:
-------------------------------------

Oh, haha, I missed that - I was only looking for the {{Max}} change and didn't notice that
the tests were suddenly gone!

> SnapshotBasedOverAllocationPolicy always caps the amount of memory availabe to 4 GBs
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-8921
>                 URL: https://issues.apache.org/jira/browse/YARN-8921
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: YARN-1011
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>            Priority: Major
>         Attachments: YARN-8921-YARN-1011.00.patch, YARN-8921-YARN-1011.01.patch, YARN-8921-YARN-1011.02.patch,
YARN-8921.00.patch
>
>
> The memory overallocate threshold is a float, so is (overAllocationThresholds.getMemoryThreshold()
*
> containersMonitor.getPmemAllocatedForContainers()). Because Math.round(float) return
an int, this would cap effectively the amount of memory available for overallocation to Integer.MAX_VALUE, [see
the code at here|https://github.com/apache/hadoop/blob/fa864b8744cfdfe613a917ba1bbd859a5b6f70b8/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/SnapshotBasedOverAllocationPolicy.java#L45]



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