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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-660) Improve AMRMClient with cookies and matching requests
Date Sat, 11 May 2013 03:43:15 GMT

    [ https://issues.apache.org/jira/browse/YARN-660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655134#comment-13655134

Vinod Kumar Vavilapalli commented on YARN-660:

Okay, I took this as an opportunity to learn more about AMRMClient. Have seen other API issues
in AMRMCient, will file tickets.

Clearly we need a validation of the APIs like you are doing in TEZ. We should definitely try
to change MR AppMaster to optionally use AMRMClient.

Coming back to current issues at hand. Correct me if I am wrong, but it looks like these StoredContainerRequests
are only useful if I have a Task in my job which needs a container and the returned container
will only be used by that task? If yes
 - That is a very narrow use-cases. May be the simplest use-case which we can address by building
on top of AMRMClient, like for e.g., a SimpleAMRMClient which only deals with a container
at a time.
 - AMRMClient should be built for the more common use-cases - I give you these requests, you
tell me when the containers are allocated, I'll do the second schedule pass according to my
own logic.

Again, I think I should see a more concrete usage. The current test-case is clearly not doing
enough to explain how it is usable - we can implement a simple job which has tasks and needs
containers inside this test-case and then illustrate the library usage.
> Improve AMRMClient with cookies and matching requests
> -----------------------------------------------------
>                 Key: YARN-660
>                 URL: https://issues.apache.org/jira/browse/YARN-660
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.0.5-beta
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>             Fix For: 2.0.5-beta
>         Attachments: YARN-660.1.patch, YARN-660.2.patch, YARN-660.3.patch, YARN-660.4.patch

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