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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5959) RM changes to support change of container ExecutionType
Date Fri, 09 Dec 2016 23:22:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15736650#comment-15736650
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Wangda Tan commented on YARN-5959:
----------------------------------

Look at overall changes and discussed with [~asuresh] offline.

A couple of things we discussed:
1) Currently approach in this patch is, if any normal container request with higher priority,
it will be allocated first. However this is discussable: if we give the available resource
of a node to a different normal container, it is possible that the running opportunistic container
will be killed and work will be wasted.
2) Instead of creating a hard-locality container request, can we wrap the ResourceRequest
to add some additional information to identify it is for container increase / promotion. This
could be useful for:
- Track pending container changes requests.
- Cancel / update pending container change requests
- Makes backend implementation of container increase / promotion to be same.
- If you think it sounds like a plan, I can also help with working on refactoring patch /
reviews. 

> RM changes to support change of container ExecutionType
> -------------------------------------------------------
>
>                 Key: YARN-5959
>                 URL: https://issues.apache.org/jira/browse/YARN-5959
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>         Attachments: YARN-5959.combined.001.patch, YARN-5959.wip.002.patch, YARN-5959.wip.patch
>
>
> RM side changes to allow an AM to ask for change of ExecutionType.
> Currently, there are two cases:
> # *Promotion* : OPPORTUNISTIC to GUARANTEED.
> # *Demotion* : GUARANTEED to OPPORTUNISTIC.
> This is similar in YARN-1197 which allows for change in Container resources. 



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