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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-12) Investigate communication improvements
Date Wed, 05 Oct 2011 01:29:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120639#comment-13120639
] 

Hudson commented on GIRAPH-12:
------------------------------

Integrated in Giraph-trunk-Commit #13 (See [https://builds.apache.org/job/Giraph-trunk-Commit/13/])
    GIRAPH-12: Investigate communication improvements (hyunsik)

hyunsik : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1179029
Files : 
* /incubator/giraph/trunk/CHANGELOG
* /incubator/giraph/trunk/src/main/java/org/apache/giraph/benchmark/RandomMessageBenchmark.java
* /incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/ArrayListWritable.java
* /incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/BasicRPCCommunications.java
* /incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/MsgList.java
* /incubator/giraph/trunk/src/main/java/org/apache/giraph/graph/GiraphJob.java

                
> Investigate communication improvements
> --------------------------------------
>
>                 Key: GIRAPH-12
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-12
>             Project: Giraph
>          Issue Type: Improvement
>          Components: bsp
>            Reporter: Avery Ching
>            Assignee: Hyunsik Choi
>            Priority: Minor
>             Fix For: 0.70.0
>
>         Attachments: GIRAPH-12_1.patch, GIRAPH-12_2.patch, GIRAPH-12_3.patch
>
>
> Currently every worker will start up a thread to communicate with every other workers.
 Hadoop RPC is used for communication.  For instance if there are 400 workers, each worker
will create 400 threads.  This ends up using a lot of memory, even with the option  
> -Dmapred.child.java.opts="-Xss64k".  
> It would be good to investigate using frameworks like Netty or custom roll our own to
improve this situation.  By moving away from Hadoop RPC, we would also make compatibility
of different Hadoop versions easier.

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