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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4306) Problem running Distributed Shell applications as a user other than the one started the daemons
Date Tue, 12 Jun 2012 17:43:43 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13293799#comment-13293799
] 

Tom White commented on MAPREDUCE-4306:
--------------------------------------

{noformat}
+    try {
+      amUser = cliParser.getOptionValue("user", UserGroupInformation
+          .getCurrentUser().getShortUserName());
+    } catch (IOException e) {
+      LOG.info("Getting current user info failed" + e.getMessage());
+    }
{noformat}

If a user has been specified on the command line then there is no need to find the current
user. In fact, if the current user can't be found then {{amUser}} won't be set. (Also, there's
a space missing in the info line.)

It's probably worth going through where user values are null or the empty string to check
they are correct (e.g. on ContainerLaunchContext#setUser).
                
> Problem running Distributed Shell applications as a user other than the one started the
daemons
> -----------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4306
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4306
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.0.0-alpha
>            Reporter: Ahmed Radwan
>            Assignee: Ahmed Radwan
>             Fix For: 2.0.1-alpha
>
>         Attachments: MAPREDUCE-4306.patch
>
>
> Using the tarball, if you start the yarn daemons using one user and then switch to a
different user. You can successfully run MR jobs, but DS jobs fail to run. Only able to run
DS jobs using the user who started the daemons.

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