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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:
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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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