[jira] [Commented] (YARN-8459) Capacity Scheduler should properly handle container allocation on app/node when app/node being removed by scheduler

["Wangda Tan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-8459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522972#comment-16522972 ] 

Wangda Tan commented on YARN-8459:
----------------------------------

Attached ver.1 patch to run Jenkins, I felt it might be not straightforward to add tests. We need a lot of mock. I'm thinking to add a chaos-monkey-like UT to just randomly start/stop nodes/apps. We should be able to get some interesting results from that. 

Will update ver.2 patch with tests. 

cc: [~sunil.govind@gmail.com], [~Tao Yang], [~cheersyang]. 

> 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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