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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2015/02/26 03:35:04 UTC

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

Lars Hofhansl created HBASE-13109:
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             Summary: 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


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.



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