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https://issues.apache.org/jira/browse/YARN-8250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16469398#comment-16469398
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Haibo Chen commented on YARN-8250:
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This is based on UpdateContainerTokenEvent. There are four combinations
possible.
If isResourceChange() returns true, then it is a container resizing request. It
is a container resource increase if isIncrease() return true.
If isExecTypeUpdate() returns true, then it is a container promotion/demotion
request. It's a promotion is isIncrease() return true.
isDecrease() is implied to be true if isIncrease() returns false. See
UpdateContainerTokenEvent.java. Hence, not much we could do here.
While I agree with you that the code can be improved to avoid such confusion,
I'd leave that to a different jira.
> Create another implementation of ContainerScheduler to support NM
> overallocation
> --------------------------------------------------------------------------------
>
> Key: YARN-8250
> URL: https://issues.apache.org/jira/browse/YARN-8250
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Haibo Chen
> Assignee: Haibo Chen
> Priority: Major
> Attachments: YARN-8250-YARN-1011.00.patch,
> YARN-8250-YARN-1011.01.patch, YARN-8250-YARN-1011.02.patch
>
>
> YARN-6675 adds NM over-allocation support by modifying the existing
> ContainerScheduler and providing a utilizationBased resource tracker.
> However, the implementation adds a lot of complexity to ContainerScheduler,
> and future tweak of over-allocation strategy based on how much containers
> have been launched is even more complicated.
> As such, this Jira proposes a new ContainerScheduler that always launch
> guaranteed containers immediately and queues opportunistic containers. It
> relies on a periodical check to launch opportunistic containers.
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