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Posted to issues@systemml.apache.org by "Matthias Boehm (JIRA)" <ji...@apache.org> on 2016/09/23 04:34:20 UTC

[jira] [Assigned] (SYSTEMML-951) Efficient spark right indexing via lookup

     [ https://issues.apache.org/jira/browse/SYSTEMML-951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm reassigned SYSTEMML-951:
---------------------------------------

    Assignee: Matthias Boehm

> Efficient spark right indexing via lookup
> -----------------------------------------
>
>                 Key: SYSTEMML-951
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-951
>             Project: SystemML
>          Issue Type: Task
>          Components: Runtime
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>
> So far all versions of spark right indexing instructions require a full scan over the data set. In case of existing partitioning (which anyway happens for any external format - binary block conversion) such a full scan is unnecessary if we're only interested in a small subset of the data. This task adds an efficient right indexing operation via 'rdd lookups' which access at most <num_lookup> partitions given existing hash partitioning. 
> cc [~mwdusenb@us.ibm.com]  



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