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From "Matthieu Morel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (S4-67) S4R packaging: improve packaging of dependencies
Date Wed, 27 Jun 2012 10:40:44 GMT
Matthieu Morel created S4-67:
--------------------------------

             Summary: S4R packaging: improve packaging of dependencies
                 Key: S4-67
                 URL: https://issues.apache.org/jira/browse/S4-67
             Project: Apache S4
          Issue Type: Improvement
            Reporter: Matthieu Morel


Currently, the creation of the S4R package involves unpackaging all dependencies, then putting
them altogether in a single file along with the S4 application classes.

This is very inefficient (and therefore potentially long, resulting in long development cycles)
because there is a lot of file copying involved. In addition it may be brittle due to name
conflicts.

We should improve the process by:
- including external jars in the S4R archive without unpackaging them, typically in the /lib
dir
- updating the classloading mechanism in S4. Ideas could be taken from Hadoop's RunJar class.
We should avoid fancy stuff here, and the current multi-classloader is not really needed if
we have a single app per S4 node.
- "shading" platform classes and dependencies, in order to avoid any conflict between S4 platform
dependencies and application dependencies?

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