Bo Wang updated GIRAPH-185:

    Attachment: GIRAPH-185.patch

Thanks for keeping up in the communication, Avery. I used putIfAbsent in the 
new version (thanks Claudio for the suggestion). Here comes the new patch.
> Improve concurrency of putMsg / putMsgList
> ------------------------------------------
>                 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
>            Assignee: Bo Wang
>             Fix For: 0.2.0
>         Attachments: GIRAPH-185.patch, GIRAPH-185.patch
>   Original Estimate: 2h
>  Remaining Estimate: 2h
> 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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