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https://issues.apache.org/jira/browse/HBASE-3855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gregory Chanan resolved HBASE-3855.
-----------------------------------
Resolution: Fixed
Fix Version/s: (was: 0.90.7)
0.90.4
It looks like this was committed way back in 0.90.4. Closing.
commit 4f4edbaa043952715d4eb9a40605154c6e41d179
Author: Michael Stack <[email protected]>
Date: Fri Jun 10 19:21:41 2011 +0000
HBASE-3855 Performance degradation of memstore because reseek is linear
git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.90@1134419
13f79535-47bb-0310-9956-ffa450edef68
Perhaps this was left open for HBASE-4195 (which never made it into 0.90).
> Performance degradation of memstore because reseek is linear
> ------------------------------------------------------------
>
> Key: HBASE-3855
> URL: https://issues.apache.org/jira/browse/HBASE-3855
> Project: HBase
> Issue Type: Improvement
> Reporter: dhruba borthakur
> Priority: Critical
> Fix For: 0.90.4
>
> Attachments: memstoreReseek.txt, memstoreReseek2.txt
>
>
> The scanner use reseek to find the next row (or next column) as part of a
> scan. The reseek code iterates over a Set to position itself at the right
> place. If there are many thousands of kvs that need to be skipped over, then
> the time-cost is very high. In this case, a seek would be far lesser in cost
> than a reseek.
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