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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3866) AM-RM protocol changes to support container resizing
Date Wed, 07 Dec 2016 23:17:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-3866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15730256#comment-15730256

Junping Du commented on YARN-3866:

bq.  As Wangda Tan mentioned, the ApplicationMasterProtocol is a lower level protocol and
end user applications should be using the AMRMClient.
I agree most applications are supposed to use AMRMClient (except MR). However, ApplicationMasterProtocol
is still marked as public for using by downstream projects (open or closed sourced). Unless
this API is marked as restricted to MR only, there should be 0 assumption for users on how
to use it.

bq. Given that the increase/decrease resources are not available in any current version of
hadoop.and given that YARN-5221 was raised to unify all container updates (resources and ExecutionType
etc.) into a single API, I am not in favor of adding back the (set/get)(Increase/Decrease)(Requests/Containers)
API as it will cause problems for future upgrades, if people do start using them.
No. It is already get released in 2.7.3: https://hadoop.apache.org/docs/r2.7.3/api/index.html.
In release prospective, all released public APIs (unless marked as unstable explicitly) are
protocol between software (and developer behind it) and users. I can understand that public
these APIs in 2.7.3 may not be intentional, but we should take response for all sequences
it could generate. We can deprecate these APIs to tell people to use the right API. I think
that is the right way to do.

> AM-RM protocol changes to support container resizing
> ----------------------------------------------------
>                 Key: YARN-3866
>                 URL: https://issues.apache.org/jira/browse/YARN-3866
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>            Reporter: MENG DING
>            Assignee: MENG DING
>             Fix For: 2.8.0, 3.0.0-alpha1
>         Attachments: YARN-3866-YARN-1197.4.patch, YARN-3866.1.patch, YARN-3866.2.patch,
> YARN-1447 and YARN-1448 are outdated. 
> This ticket deals with AM-RM Protocol changes to support container resize according to
the latest design in YARN-1197.
> 1) Add increase/decrease requests in AllocateRequest
> 2) Get approved increase/decrease requests from RM in AllocateResponse
> 3) Add relevant test cases

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