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https://issues.apache.org/jira/browse/GIRAPH-185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255933#comment-13255933
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Bo Wang commented on GIRAPH-185:
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putVertexIdMessagesList can be improved together
> 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
> Fix For: 0.2.0
>
> 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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