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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7763) Compactions not sorting based on size anymore.
Date Wed, 06 Feb 2013 17:25:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13572598#comment-13572598
] 

Sergey Shelukhin commented on HBASE-7763:
-----------------------------------------

e.g. if by seqnum you have F0..3 with sizes 18,40,10,10, and ratio 1.0, you shouldn't compact
18,10,10 into F4, as it will get max seqnum from F3, and if F1 has K1 and F0 had exact same
K1, the read preference of K1s will change (correct me if I'm wrong...)
                
> Compactions not sorting based on size anymore.
> ----------------------------------------------
>
>                 Key: HBASE-7763
>                 URL: https://issues.apache.org/jira/browse/HBASE-7763
>             Project: HBase
>          Issue Type: Bug
>          Components: Compaction
>    Affects Versions: 0.96.0, 0.94.4
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.6
>
>         Attachments: HBASE-7763-trunk-TESTING.patch, HBASE-7763-trunk-TESTING.patch,
HBASE-7763-trunk-TESTING.patch
>
>
> Currently compaction selection is not sorting based on size.  This causes selection to
choose larger files to re-write than are needed when bulk loads are involved.

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