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Posted to yarn-dev@hadoop.apache.org by "Doug Haigh (JIRA)" <ji...@apache.org> on 2014/09/30 14:48:34 UTC
[jira] [Created] (YARN-2625) Problems with CLASSPATH in Job
Submission REST API
Doug Haigh created YARN-2625:
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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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