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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5389) [book] book.xml - minor correction of compaction algorithm (example #1)
Date Mon, 13 Feb 2012 23:17:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207323#comment-13207323
] 

Hudson commented on HBASE-5389:
-------------------------------

Integrated in HBase-TRUNK-security #110 (See [https://builds.apache.org/job/HBase-TRUNK-security/110/])
    hbase-5389.  book.xml - minor correction of compaction selection example #1 (Revision
1243532)

     Result = SUCCESS
                
> [book] book.xml - minor correction of compaction algorithm (example #1)
> -----------------------------------------------------------------------
>
>                 Key: HBASE-5389
>                 URL: https://issues.apache.org/jira/browse/HBASE-5389
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Doug Meil
>            Assignee: Doug Meil
>            Priority: Minor
>         Attachments: book_hbase_5389.xml.patch
>
>
> Nicholas pointed this out to me.  The "what" was correct in all cases for example #1,
but two of the "whys" weren't correct:
> --------
> Slight modification to the book.  In 8.7.5.5.2
> * 100 --> No, because sum(50, 23, 12, 12) * 1.0 = 97.
> * 50 --> No, because sum(23, 12, 12) * 1.0 = 47.
> * 23 --> Yes, because sum(12, 12) * 1.0 = 24.
> * 12 --> Yes, because sum(12) * 1.0 = 12.
> * 12 --> Yes, because the previous file had been included, and this is
> included because this does not exceed the the max-file limit of 5.
> [12,12] are include solely because an older/larger file is included: 23.
> The compaction algorithm itself stops after noticing that 23 should be
> included.  Sum(12) * 1.0 >= 12 isn't done at all
> --------
> Correcting explanation of the last 2 files on why they were selected for minor compaction.

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