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Posted to yarn-issues@hadoop.apache.org by "Hong Zhiguo (JIRA)" <ji...@apache.org> on 2014/04/18 05:17:16 UTC

[jira] [Commented] (YARN-1954) Add waitFor to AMRMClient(Async)

    [ https://issues.apache.org/jira/browse/YARN-1954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973749#comment-13973749 ] 

Hong Zhiguo commented on YARN-1954:
-----------------------------------

Do you mean group the status pooling loop into the new method "waitForCompletion", or the "completion" should be asynchronously notified by RM?

> Add waitFor to AMRMClient(Async)
> --------------------------------
>
>                 Key: YARN-1954
>                 URL: https://issues.apache.org/jira/browse/YARN-1954
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: client
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Zhijie Shen
>            Assignee: Tsuyoshi OZAWA
>
> Recently, I saw some use cases of AMRMClient(Async). The painful thing is that the main non-daemon thread has to sit in a dummy loop to prevent AM process exiting before all the tasks are done, while unregistration is triggered on a separate another daemon thread by callback methods (in particular when using AMRMClientAsync). IMHO, it should be beneficial to add a waitFor method to AMRMClient(Async) to block the AM until unregistration or user supplied check point, such that users don't need to write the loop themselves.



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