[
https://issues.apache.org/jira/browse/HBASE-13109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339093#comment-14339093
]
Lars Hofhansl commented on HBASE-13109:
---------------------------------------
Doesn't quite work since we check the timeranges before the individual columns
(and so the column trackers have no way to manage their state - i.e. track when
the current column is done)
> 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)
