[jira] [Commented] (HBASE-24742) Improve performance of SKIP vs SEEK logic

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

    [ https://issues.apache.org/jira/browse/HBASE-24742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169628#comment-17169628 ] 

Lars Hofhansl commented on HBASE-24742:
---------------------------------------

Re: Tests. This is purely an internal optimization of another optimization (no kidding) with no functional impact. For the SEEK optimization we have tests that assert the number of SEEKs vs SKIPs during scanning.

I cannot think of any useful additional tests. Lemme perhaps check if there are SEEK vs SKIP tests with ROWCOL BFs enabled. Or [~bharathv], could you also perhaps have a look as I'm off the next few weeks.


> Improve performance of SKIP vs SEEK logic
> -----------------------------------------
>
>                 Key: HBASE-24742
>                 URL: https://issues.apache.org/jira/browse/HBASE-24742
>             Project: HBase
>          Issue Type: Bug
>          Components: Performance, regionserver
>    Affects Versions: 3.0.0-alpha-1, 1.7.0, 2.4.0
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.3.1, 1.7.0, 2.4.0, 2.1.10, 2.2.6
>
>         Attachments: 24742-master.txt, hbase-1.6-regression-flame-graph.png, hbase-24742-branch-1.txt
>
>
> In our testing of HBase 1.3 against the current tip of branch-1 we saw a 30% slowdown in scanning scenarios.
> We tracked it back to HBASE-17958 and HBASE-19863.
> Both add comparisons to one of the tightest HBase has.
> [~bharathv]



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