[jira] [Updated] (HBASE-13109) Use scanner look ahead for timeranges as well

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

     [ https://issues.apache.org/jira/browse/HBASE-13109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-13109:
----------------------------------
    Attachment: 13109-0.98.txt

0.98 patch. Untested, I only checked that it compiles. Just parking.

> Use scanner look ahead for timeranges as well
> ---------------------------------------------
>
>                 Key: HBASE-13109
>                 URL: https://issues.apache.org/jira/browse/HBASE-13109
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Priority: Minor
>         Attachments: 13109-0.98.txt
>
>
> This is a continuation of HBASE-9778.
> We've seen a scenario of a very slow scan over a region using a timerange that happens to fall after the ts of any Cell in the region.
> Turns out we spend a lot of time seeking.
> Tested with a 5 column table, and the scan is 5x faster when the timerange falls before all Cells' ts.
> We can use the lookahead hint introduced in HBASE-9778 to do opportunistic SKIPing before we actually seek.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)