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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3877) Determine Proper Defaults for Compaction ThreadPools
Date Tue, 15 May 2012 23:55:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276346#comment-13276346
] 

Hudson commented on HBASE-3877:
-------------------------------

Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #5 (See [https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/5/])
    [HBASE-5867] Improve Compaction Throttle Default

Summary:
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. MinFilesToCompact 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 and only get timed-majors
versus having everything accidentally promoted.

Test Plan:  - mvn test

Reviewers: JIRA, Kannan, Liyin
Reviewed By: Kannan
CC: stack

Differential Revision: https://reviews.facebook.net/D2943 (Revision 1338809)

     Result = FAILURE
nspiegelberg : 
Files : 
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java

                
> Determine Proper Defaults for Compaction ThreadPools
> ----------------------------------------------------
>
>                 Key: HBASE-3877
>                 URL: https://issues.apache.org/jira/browse/HBASE-3877
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Trivial
>              Labels: compaction
>
> With the introduction of HBASE-1476, we now have multithreaded compactions + 2 different
ThreadPools for large and small compactions.  However, this is disabled by default until we
can determine a proper default throttle point.  Opening this JIRA to log all discussion on
how to select a good default for this case.

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