Github user tgravescs commented on the pull request: https://github.com/apache/incubator-spark/pull/332#issuecomment-35807187 I think I have addressed all the comments and questions. If I missed something please let me know. Note I thought about moving the security files (SparkSaslClient/SparkSaslServer/SecurityManager) into a security sub-directory. Let me know what you think about that. Also if there is preferred or more optimal way to do the SparkSaslDigestCallbackHandler and SparkSaslClientCallbackHandler rather then having the private nested class let me know.
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