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Posted to issues@spark.apache.org by "Joseph K. Bradley (JIRA)" <ji...@apache.org> on 2015/10/09 01:45:26 UTC

[jira] [Updated] (SPARK-10599) Decrease communication in BlockMatrix multiply and increase performance

     [ https://issues.apache.org/jira/browse/SPARK-10599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph K. Bradley updated SPARK-10599:
--------------------------------------
            Shepherd: Joseph K. Bradley
            Assignee: Burak Yavuz
    Target Version/s: 1.6.0

> 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
>
> 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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