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From "MENG DING (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1197) Support changing resources of an allocated container
Date Mon, 29 Jun 2015 17:53:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-1197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605995#comment-14605995
] 

MENG DING commented on YARN-1197:
---------------------------------

One option to consider is to let NM confirm back with RM when it is done decreasing the container
size. If RM doesn't receive confirmation from NM, it will keep sending the decrease message
to NM during heartbeat. This is only for the purpose of resource enforcement. From scheduling
point of view, as soon as the decrease request is approved in RM, it takes effect immediately.


I am not sure if this is worth the effort.

> Support changing resources of an allocated container
> ----------------------------------------------------
>
>                 Key: YARN-1197
>                 URL: https://issues.apache.org/jira/browse/YARN-1197
>             Project: Hadoop YARN
>          Issue Type: Task
>          Components: api, nodemanager, resourcemanager
>    Affects Versions: 2.1.0-beta
>            Reporter: Wangda Tan
>         Attachments: YARN-1197 old-design-docs-patches-for-reference.zip, YARN-1197_Design.2015.06.24.pdf,
YARN-1197_Design.pdf
>
>
> The current YARN resource management logic assumes resource allocated to a container
is fixed during the lifetime of it. When users want to change a resource 
> of an allocated container the only way is releasing it and allocating a new container
with expected size.
> Allowing run-time changing resources of an allocated container will give us better control
of resource usage in application side



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