[jira] [Commented] (YARN-1040) De-link container life cycle from the process and add ability to execute multiple processes in the same long-lived container

["Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-1040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174775#comment-15174775 ] 

Vinod Kumar Vavilapalli commented on YARN-1040:
-----------------------------------------------

bq. General case: AM launches multiple containers at the same time. This is essentially container-groups - we should keep this option open.
Clarification on what I meant here: It's okay for now to only design APIs (and defer implementation) so that even if our first version of implementation only covers allocation-vs-container delinking, container-groups are possible in future without further API changes/addition.

> De-link container life cycle from the process and add ability to execute multiple processes in the same long-lived container
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-1040
>                 URL: https://issues.apache.org/jira/browse/YARN-1040
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>    Affects Versions: 3.0.0
>            Reporter: Steve Loughran
>
> The AM should be able to exec >1 process in a container, rather than have the NM automatically release the container when the single process exits.
> This would let an AM restart a process on the same container repeatedly, which for HBase would offer locality on a restarted region server.
> We may also want the ability to exec multiple processes in parallel, so that something could be run in the container while a long-lived process was already running. This can be useful in monitoring and reconfiguring the long-lived process, as well as shutting it down.



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