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https://issues.apache.org/jira/browse/YARN-8459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated YARN-8459:
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Summary: Improve logs of Capacity Scheduler to better debug invalid states
(was: Capacity Scheduler should properly handle container allocation on
app/node when app/node being removed by scheduler)
> Improve logs of Capacity Scheduler to better debug invalid states
> -----------------------------------------------------------------
>
> 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, YARN-8459.002.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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