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https://issues.apache.org/jira/browse/YARN-8459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16523262#comment-16523262
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Weiwei Yang commented on YARN-8459:
-----------------------------------
Hi [~leftnoteasy]
Both {{CapacityScheduler#removeNode}} and
{{CapacityScheduler#doneApplicationAttempt}} remove all reservations of the
node/app. Do you mean this issue happens because the allocation thread is
reading a stale info of app/node? Instead of adding a stop flag, can we check
if node/app is still valid while doing the reserve/allocate?
> Capacity Scheduler should properly handle container allocation on app/node
> when app/node being removed by scheduler
> -------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-8459
> URL: https://issues.apache.org/jira/browse/YARN-8459
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacity scheduler
> Affects Versions: 3.1.0
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Priority: Blocker
> Attachments: YARN-8459.001.patch
>
>
> Thanks [~gopalv] for reporting this issue.
> In async mode, capacity scheduler can allocate/reserve containers on node/app
> when node/app is being removed ({{doneApplicationAttempt}}/{{removeNode}}).
> This will cause some issues, for example.
> a. Container for app_1 reserved on node_x.
> b. At the same time, app_1 is being removed.
> c. Reserve on node operation finished after app_1 removed
> ({{doneApplicationAttempt}}).
> For all the future runs, the node_x is completely blocked by the invalid
> reservation. It keep reporting "Trying to schedule for a finished app, please
> double check" for the node_x.
> We need a fix to make sure this won't happen.
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