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From "Doug Haigh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2625) Problems with CLASSPATH in Job Submission REST API
Date Tue, 30 Sep 2014 12:48:34 GMT
Doug Haigh created YARN-2625:
--------------------------------

             Summary: Problems with CLASSPATH in Job Submission REST API
                 Key: YARN-2625
                 URL: https://issues.apache.org/jira/browse/YARN-2625
             Project: Hadoop YARN
          Issue Type: Bug
          Components: api
    Affects Versions: 2.5.1
            Reporter: Doug Haigh


There are a couple of issues I have found specifying the CLASSPATH environment variable using
the REST API.

1) In the Java client, the CLASSPATH environment is usually made up of either the value of
the yarn.application.classpath in yarn-site.xml value or the default YARN classpath value
as defined by YarnConfiguration.DEFAULT_YARN_CROSS_PLATFORM_APPLICATION_CLASSPATH. REST API
consumers have no method of telling the resource manager to use the default unless they hardcode
the default value themselves. If the default ever changes, the code would need to change.


2) If any environment variables are used in the CLASSPATH environment 'value' field, they
are evaluated when the values are NULL resulting in bad values in the CLASSPATH. For example,
if I had hardcoded the CLASSPATH value to the default of "$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/*,
$HADOOP_YARN_HOME/share/hadoop/yarn/*, $HADOOP_YARN_HOME/share/hadoop/yarn/lib/*" the classpath
passed to the application master is ":/share/hadoop/common/*:/share/hadoop/common/lib/*:/share/hadoop/hdfs/*:/share/hadoop/hdfs/lib/*:/share/hadoop/yarn/*:/share/hadoop/yarn/lib/*"

These two problems require REST API consumers to always have the fully resolved path defined
in the yarn.application.classpath value. If the property is missing or contains environment
varaibles, the application created by the REST API will fail due to the CLASSPATH being incorrect.



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