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https://issues.apache.org/jira/browse/HAMA-774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699182#comment-13699182
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Martin Illecker commented on HAMA-774:
--------------------------------------
I have implemented a MatrixMultiplication[1] example, that would use this
CompositeInputFormat.
But currently I'm missing some integration into BSPPeerImpl:
{code}
FATAL bsp.GroomServer: Error running child
java.lang.NullPointerException
at org.apache.hama.bsp.BSPPeerImpl.readNext(BSPPeerImpl.java:604)
at
at.illecker.hama.rootbeer.examples.matrixmultiplication.cpu.MatrixMultiplicationBSPCpu.bsp(Unknown
Source)
at org.apache.hama.bsp.BSPTask.runBSP(BSPTask.java:177)
at org.apache.hama.bsp.BSPTask.run(BSPTask.java:146)
at org.apache.hama.bsp.GroomServer$BSPPeerChild.main(GroomServer.java:1262)
at org.apache.hama.bsp.GroomServer$BSPPeerChild.main(GroomServer.java:1262)
{code}
Would be nice if someone could help me!
Thanks a lot!
[1]
https://github.com/millecker/applications/blob/master/hama/rootbeer/matrixmultiplication/src/at/illecker/hama/rootbeer/examples/matrixmultiplication/cpu/MatrixMultiplicationBSPCpu.java
> CompositeInputFormat in Hama
> ----------------------------
>
> Key: HAMA-774
> URL: https://issues.apache.org/jira/browse/HAMA-774
> Project: Hama
> Issue Type: New Feature
> Components: bsp core
> Affects Versions: 0.6.2
> Reporter: Martin Illecker
> Assignee: Martin Illecker
> Priority: Minor
> Fix For: 0.6.3
>
> Attachments: HAMA-774.patch
>
>
> *Adapting Hadoop CompositeInputFormat to Hama.*
> Adapt the CompositeInputFormat from Hadoop and integrate it into Hama.
> e.g., Useful for matrix multiplication example by doing a inner join of two
> matrices.
> Therefore the Hadoop join package has been adapted within
> *org.apache.hama.bsp.join*.
> Finally I would need some help to integrate the CompositeInputFormat into
> Hama by using
> {code}
> job.setInputFormat(CompositeInputFormat.class);
> job.set("bsp.join.expr", CompositeInputFormat.compose("inner",
> SequenceFileInputFormat.class, aPath, bPath));
> {code}
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