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https://issues.apache.org/jira/browse/YARN-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608947#comment-14608947
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Wangda Tan commented on YARN-3849:
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Thanks for working on this, [~sunilg]!
The fix of Proportion..Policy looks good to me, some comments about test
changes:
- The string syntax to define resources looks great! :)
- Instead of changing all test cases in TestProportional..Policy, could you
make another overload method can take String[][]? This can avoid lots of
changes for test cases
- Initialization of ResourceCalculator should be a part of buildPolicy, for
example, add a "boolean useDominateResourceCalculator" to buildPolicy
- Could you change TestPro..PolicyForNodePartitions to accept CPU when doing
queue/application mocking as well?
> Too much of preemption activity causing continuos killing of containers
> across queues
> -------------------------------------------------------------------------------------
>
> Key: YARN-3849
> URL: https://issues.apache.org/jira/browse/YARN-3849
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler
> Affects Versions: 2.7.0
> Reporter: Sunil G
> Assignee: Sunil G
> Priority: Critical
> Attachments: 0001-YARN-3849.patch
>
>
> Two queues are used. Each queue has given a capacity of 0.5. Dominant
> Resource policy is used.
> 1. An app is submitted in QueueA which is consuming full cluster capacity
> 2. After submitting an app in QueueB, there are some demand and invoking
> preemption in QueueA
> 3. Instead of killing the excess of 0.5 guaranteed capacity, we observed that
> all containers other than AM is getting killed in QueueA
> 4. Now the app in QueueB is trying to take over cluster with the current free
> space. But there are some updated demand from the app in QueueA which lost
> its containers earlier, and preemption is kicked in QueueB now.
> Scenario in step 3 and 4 continuously happening in loop. Thus none of the
> apps are completing.
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