[jira] [Resolved] (HBASE-9778) Add hint to ExplicitColumnTracker to avoid seeking

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-9778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl resolved HBASE-9778.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.94.18
                   0.99.0
                   0.98.1
                   0.96.2

Committed to all branches. Thanks for taking a look.

> Add hint to ExplicitColumnTracker to avoid seeking
> --------------------------------------------------
>
>                 Key: HBASE-9778
>                 URL: https://issues.apache.org/jira/browse/HBASE-9778
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.2, 0.98.1, 0.99.0, 0.94.18
>
>         Attachments: 9778-0.94-v2.txt, 9778-0.94-v3.txt, 9778-0.94-v4.txt, 9778-0.94-v5.txt, 9778-0.94-v6.txt, 9778-0.94-v7.txt, 9778-0.94-v8.txt, 9778-0.94-v9.txt, 9778-0.94.txt, 9778-trunk-v2.txt, 9778-trunk-v3.txt, 9778-trunk-v6.txt, 9778-trunk-v7.txt, 9778-trunk-v8.txt, 9778-trunk-v9.txt, 9778-trunk.txt
>
>
> The issue of slow seeking in ExplicitColumnTracker was brought up by [~vrodionov] on the dev list.
> My idea here is to avoid the seeking if we know that there aren't many versions to skip.
> How do we know? We'll use the column family's VERSIONS setting as a hint. If VERSIONS is set to 1 (or maybe some value < 10) we'll avoid the seek and call SKIP repeatedly.
> HBASE-9769 has some initial number for this approach:
> Interestingly it depends on which column(s) is (are) selected.
> Some numbers: 4m rows, 5 cols each, 1 cf, 10 bytes values, VERSIONS=1, everything filtered at the server with a ValueFilter. Everything measured in seconds.
> Without patch:
> ||Wildcard||Col 1||Col 2||Col 4||Col 5||Col 2+4||
> |6.4|8.5|14.3|14.6|11.1|20.3|
> With patch:
> ||Wildcard||Col 1||Col 2||Col 4||Col 5||Col 2+4||
> |6.4|8.4|8.9|9.9|6.4|10.0|
> Variation here was +- 0.2s.
> So with this patch scanning is 2x faster than without in some cases, and never slower. No special hint needed, beyond declaring VERSIONS correctly.



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