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From Bruno Mahé (Created) (JIRA) <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3505) yarn APPLICATION_CLASSPATH needs to be overridable
Date Fri, 02 Dec 2011 23:59:40 GMT
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, 0.23.1
            Reporter: Bruno Mahé


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:
{quote}
  /**
   * 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/*"
      };
{quote}

Not all deployment scenarii fit in this layout and therefore we need a standardized way to
customize this class path.


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