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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-129) Simplify classpath construction for mini YARN tests
Date Tue, 25 Sep 2012 10:56:07 GMT
Tom White created YARN-129:
------------------------------

             Summary: Simplify classpath construction for mini YARN tests
                 Key: YARN-129
                 URL: https://issues.apache.org/jira/browse/YARN-129
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: client
            Reporter: Tom White
            Assignee: Tom White


The test classpath includes a special file called 'mrapp-generated-classpath' (or similar
in distributed shell) that is constructed at build time, and whose contents are a classpath
with all the dependencies needed to run the tests. When the classpath for a container (e.g.
the AM) is constructed the contents of mrapp-generated-classpath is read and added to the
classpath, and the file itself is then added to the classpath so that later when the AM constructs
a classpath for a task container it can propagate the test classpath correctly.

This mechanism can be drastically simplified by propagating the system classpath of the current
JVM (read from the java.class.path property) to a launched JVM, but only if running in the
context of the mini YARN cluster. Any tests that use the mini YARN cluster will automatically
work with this change. Although any that explicitly deal with mrapp-generated-classpath can
be simplified.


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