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Posted to issues@trafodion.apache.org by "Eric Owhadi (JIRA)" <ji...@apache.org> on 2016/01/28 01:23:39 UTC

[jira] [Updated] (TRAFODION-1420) Use ClientSmallScanner for small scans to improve performance

     [ https://issues.apache.org/jira/browse/TRAFODION-1420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Owhadi updated TRAFODION-1420:
-----------------------------------
    Fix Version/s:     (was: 2.0-incubating)

> Use ClientSmallScanner for small scans to improve performance
> -------------------------------------------------------------
>
>                 Key: TRAFODION-1420
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-1420
>             Project: Apache Trafodion
>          Issue Type: Improvement
>          Components: sql-cmp, sql-exe
>            Reporter: Eric Owhadi
>            Assignee: Eric Owhadi
>              Labels: performance
>
> Hbase implements an optimization for small scan (defined as scanning less than a data block ie 64Kb) resulting in 3X performance improvement. The underlying trick is about cutting down RPC calls from 3 (OpenScan/Next/Close)  to 1, and use pread stateless instead of seek/read state-full and locking method to read data.  This JIRA is about improving the compiler who can be aware if a scan will be acting on single data block (small) or not, and pass this data to executor so that it can use the right parameter for scan. (scan.setSmall(boolean)).
> reference:
> https://issues.apache.org/jira/browse/HBASE-9488
> https://issues.apache.org/jira/browse/HBASE-7266



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