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Review request for giraph.


Summary
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Use ConcurrentHashMap and ConcurrentLinkedQueue to allow concurrent assess to 
message map. The concurrencyLevel of ConcurrentHashMap uses the default value. 
There may be some performance gain by tuning this value.


This addresses bug GIRAPH-185.
    https://issues.apache.org/jira/browse/GIRAPH-185


Diffs
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http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/BasicRPCCommunications.java
 1328747 

Diff: https://reviews.apache.org/r/4852/diff


Testing
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Thanks,

Bo

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