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https://issues.apache.org/jira/browse/SPARK-10599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-10599.
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Resolution: Fixed
Fix Version/s: 1.6.0
Issue resolved by pull request 8757
[https://github.com/apache/spark/pull/8757]
> Decrease communication in BlockMatrix multiply and increase performance
> -----------------------------------------------------------------------
>
> Key: SPARK-10599
> URL: https://issues.apache.org/jira/browse/SPARK-10599
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Burak Yavuz
> Assignee: Burak Yavuz
> Fix For: 1.6.0
>
>
> The BlockMatrix multiply sends each block to all the corresponding columns of
> the right BlockMatrix, even though there might not be any corresponding block
> to multiply with.
> Some optimizations we can perform are:
> - Simulate the multiplication on the driver, and figure out which blocks
> actually need to be shuffled
> - Send the block once to a partition, and join inside the partition rather
> than sending multiple copies to the same partition
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