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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3209) New Compaction Heuristic
Date Tue, 09 Nov 2010 23:20:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930352#action_12930352
] 

HBase Review Board commented on HBASE-3209:
-------------------------------------------

Message from: "Nicolas" <nspiegelberg@facebook.com>

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This is an automatically generated e-mail. To reply, visit:
http://review.cloudera.org/r/1192/#review1878
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trunk/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
<http://review.cloudera.org/r/1192/#comment6095>

    I know.  I'm a whitespace ASBO.  sorry :(



trunk/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
<http://review.cloudera.org/r/1192/#comment6092>

    we can work on fine-tuning this.  +50% was a safe cover for us and worked fine because
we pre-split regions.  Really, you probably don't need the pad because the summation algorithm
will operate on at least 3 storefiles, so (assuming roughly even flush sizes) you get +100%
pad from that.



trunk/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
<http://review.cloudera.org/r/1192/#comment6091>

    s/are meet/have met/


- Nicolas





> New Compaction Heuristic
> ------------------------
>
>                 Key: HBASE-3209
>                 URL: https://issues.apache.org/jira/browse/HBASE-3209
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>
> We have a whole bunch of compaction awesome in our internal 0.89 branch.  Porting this
to 0.90:
> 1) don't unconditionally compact 4 files. have a min threshold
> 2) intelligently upgrade minors to majors
> 3) new compaction algo (derived in HBASE-2462 )

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