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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [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
Date Wed, 13 Nov 2013 06:58:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-1040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13821012#comment-13821012
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Bikas Saha commented on YARN-1040:
----------------------------------

Thats unnecessary overhead to make 2 RPC calls for the first process when I want to run multiple
processes within the same container. I first need to do startContainer(null) and then startProcess().
startContainer(process, flag-multiple-true) is more efficient since there is only 1 RPC. Also,
the flag is completely backwards compatible with a default of false. We must support startContainer(null/no-process,
flag-multiple-true) for the case in which the first process to run is not yet ready or the
case mentioned in YARN-1404 where we dont ever want to run a process.

> 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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