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https://issues.apache.org/jira/browse/YARN-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13664381#comment-13664381
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Vinod Kumar Vavilapalli commented on YARN-422:
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bq. In the previous discussion, you suggested:
Yes, you are right. Let's stick to that.

bq. IMHO, the callbacks can be either blocking or non-blocking. It depends on 
the implementation of the callback interface. To be non-blocking, the 
implementation can similarly schedule an event when the callbacks are invoked, 
and the event will be dispatched to a thread for processing
Agreed. That's what I hinted at too. A little javadoc will be great!

                
> Add NM client library
> ---------------------
>
>                 Key: YARN-422
>                 URL: https://issues.apache.org/jira/browse/YARN-422
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>            Assignee: Zhijie Shen
>         Attachments: AMNMClient_Defination.txt, 
> AMNMClient_Definition_Updated_With_Tests.txt, proposal_v1.pdf, 
> YARN-422.1.patch, YARN-422.2.patch, YARN-422.3.patch, YARN-422.4.patch, 
> YARN-422.5.patch, YARN-422.6.patch
>
>
> Create a simple wrapper over the ContainerManager protocol to provide hide 
> the details of the protocol implementation.

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