[jira] [Commented] (MAPREDUCE-3505) yarn APPLICATION_CLASSPATH needs to be overridable

["Bruno Mahé (Commented JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182747#comment-13182747 ] 

Bruno Mahé commented on MAPREDUCE-3505:
---------------------------------------

+1 to the patch.
It solves a big issue I have had to hack around. This patch makes it way better than the current situation and we can always improve it later on.
                
> yarn APPLICATION_CLASSPATH needs to be overridable
> --------------------------------------------------
>
>                 Key: MAPREDUCE-3505
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3505
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Bruno Mahé
>            Assignee: Ahmed Radwan
>              Labels: bigtop
>         Attachments: MAPREDUCE-3505.patch
>
>
> Right now MRApps sets the classpath to just being mrapp-generated-classpath, its content and a hardcoded list of directories.
> If I understand correctly mrapp-generated-classpath is only there for testing and may change or disappear at any time
> The list of hardcoded directories is defined in hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java at line 92.
> For convenience, here is its current content:
> {noformat}
>   /**
>    * Classpath for typical applications.
>    */
>   public static final String[] APPLICATION_CLASSPATH =
>       new String[] {
>         "$HADOOP_CONF_DIR",
>         "$HADOOP_COMMON_HOME/share/hadoop/common/*",
>         "$HADOOP_COMMON_HOME/share/hadoop/common/lib/*",
>         "$HADOOP_HDFS_HOME/share/hadoop/hdfs/*",
>         "$HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*",
>         "$YARN_HOME/modules/*",
>         "$YARN_HOME/lib/*"
>       };
> {noformat}
> Not all deployment scenarii fit in this layout and therefore we need a standardized way to customize this class path.

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