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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1100) Giving multiple commands to ContainerLaunchContext doesn't work as expected
Date Tue, 03 Sep 2013 17:17:52 GMT

    [ https://issues.apache.org/jira/browse/YARN-1100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756795#comment-13756795
] 

Sandy Ryza commented on YARN-1100:
----------------------------------

In the MR and distributed shell code, the command list does not seem to be used for holding
arguments to the same process.  All arguments are concatenated and placed in a single entry
in the commands list.
                
> Giving multiple commands to ContainerLaunchContext doesn't work as expected
> ---------------------------------------------------------------------------
>
>                 Key: YARN-1100
>                 URL: https://issues.apache.org/jira/browse/YARN-1100
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: api, nodemanager
>    Affects Versions: 2.1.0-beta
>            Reporter: Sandy Ryza
>
> A ContainerLaunchContext accepts a list of commands (as strings) to be executed to launch
the container.  I would expect that giving a list with the two commands "echo yolo" and "date"
would print something like
> {code}
> yolo
> Mon Aug 26 14:40:23 PDT 2013
> {code}
> Instead it prints
> {code}
> yolo date
> {code}
> This is because the commands get executed with:
> {code}
> exec /bin/bash -c "echo yolo date"
> {code}
> To get the expected behavior I have to include semicolons at the end of each command.
At the very least, this should be documented, but I think better would be for the NM to insert
the semicolons.

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