Tom White created YARN-129:
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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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