Improve concurrency of putMsg / putMsgList
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                 Key: GIRAPH-185
                 URL: https://issues.apache.org/jira/browse/GIRAPH-185
             Project: Giraph
          Issue Type: Improvement
          Components: graph
    Affects Versions: 0.2.0
            Reporter: Bo Wang
             Fix For: 0.2.0


Currently in putMsg / putMsgList, a synchronized closure is used to protect the 
whole transientInMessages when adding the new message. This lock prevents other 
concurrent calls to putMsg/putMsgList and increases the response time. We 
should use fine-grain locks to allow high concurrency in message communication.

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