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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5867) Improve Compaction Throttle Default
Date Sat, 05 May 2012 10:43:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268935#comment-13268935
] 

Phabricator commented on HBASE-5867:
------------------------------------

mbautin has committed the revision "[jira] [HBASE-5867] [89-fb] Improve Compaction Throttle
Default".

REVISION DETAIL
  https://reviews.facebook.net/D2943

COMMIT
  https://reviews.facebook.net/rHBASEEIGHTNINEFBBRANCH1334388

                
> Improve Compaction Throttle Default
> -----------------------------------
>
>                 Key: HBASE-5867
>                 URL: https://issues.apache.org/jira/browse/HBASE-5867
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>         Attachments: D2943.1.patch, HBASE-5867-trunk.patch
>
>
> We recently had a production issue where our compactions fell behind because our compaction
throttle was improperly tuned and accidentally upgraded all compactions to the large pool.
 The default from HBASE-3877 makes 1 bad assumption: the default number of flushed files in
a compaction.  Currently the algorithm is:
> throttleSize ~= flushSize * 2
> This assumes that the basic compaction utilizes 3 files and that all 3 files are compressed.
 In this case, "hbase.hstore.compaction.min" == 6 && the values were not very compressible.
 Both conditions should be taken into consideration.  As a default, it is less damaging for
the large thread to be slightly higher than it needs to be versus having everything accidentally
promoted.

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