[jira] [Updated] (TRAFODION-1421) Implement parallel Scanner primitive

["Hans Zeller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TRAFODION-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hans Zeller updated TRAFODION-1421:
-----------------------------------
    Fix Version/s:     (was: 2.0-incubating)
                   2.1-incubating

> Implement parallel Scanner primitive
> ------------------------------------
>
>                 Key: TRAFODION-1421
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-1421
>             Project: Apache Trafodion
>          Issue Type: Improvement
>          Components: sql-cmp, sql-exe
>            Reporter: Eric Owhadi
>            Assignee: Eric Owhadi
>              Labels: performance
>             Fix For: 2.1-incubating
>
>
> ClientScanner API is serial, to conserve key ordering. However, many operators don't care about ordering and would rather get the scan result fast, regardless of order. This JIRA is about providing a parallel scanner, that would take care of splitting the work between all region servers evenly if possible. HBase had a parallel scanner in the pipe for quite some time HBAse-9272, but the work is stalled since october 2013. However, looking at the available code, look like a big part can be leveraged without requiring an HBase custom build. 



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