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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-422) Add AM-NM client library
Date Tue, 23 Apr 2013 21:37:17 GMT

    [ https://issues.apache.org/jira/browse/YARN-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639660#comment-13639660
] 

Bikas Saha commented on YARN-422:
---------------------------------

I was hoping that the final AMNMClient library would be a one stop library for AM's to communicate
with all the NM's in the cluster. The document outlines a wrapper around the NMProtocol for
talking to 1 NM. This wrapper is useful by itself because it hides the PBImpl etc implementation
details of the protocol itself, similar to how YarnClient started off as. AMRMClient does
a little bit more than simply wrapping the Java protocol.
So as a first step the above design for wrapping the boiler plate code of the NM Protocol
into a utility library wrapper sounds good. I think the method calls are all blocking since
the RPC itself is blocking and this is a simple wrapper around the RPC. Maybe we can call
be NMClient.

Once this is done we can look at creating an AMNMClient library that will provide a single
object that an AM can use to manage its containers. This may have its own internal threading
etc which will allow the AM to make non-blocking calls. Lets figure that out in a subsequent
jira and use this one to just write the wrapper NMCLient that you have proposed.
                
> Add AM-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: proposal_v1.pdf
>
>
> Create a simple wrapper over the AM-NM container protocol to provide hide the details
of the protocol implementation.

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