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