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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4463) Run more aggressive compactions during off peak hours
Date Thu, 17 Nov 2011 01:27:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151710#comment-13151710
] 

Phabricator commented on HBASE-4463:
------------------------------------

nspiegelberg has commented on the revision "HBASE-4463 [jira] Run more aggressive compactions
during off peak hours".

INLINE COMMENTS
  src/test/java/org/apache/hadoop/hbase/regionserver/TestCompactSelection.java:248-250 need
to +24 or else it will fail at night, correct?

REVISION DETAIL
  https://reviews.facebook.net/D471

                
> Run more aggressive compactions during off peak hours
> -----------------------------------------------------
>
>                 Key: HBASE-4463
>                 URL: https://issues.apache.org/jira/browse/HBASE-4463
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Karthik Ranganathan
>            Assignee: Karthik Ranganathan
>         Attachments: HBASE-4463.D471.1.patch
>
>
> The number of iops on the disk and the top of the rack bandwidth utilization at off peak
hours is much lower than at peak hours depending on the application usage pattern. We can
utilize this knowledge to improve the performance of the HBase cluster by increasing the compact
selection ratio to a much larger value during off-peak hours than otherwise - increasing hbase.hstore.compaction.ratio
(1.2 default) to hbase.hstore.compaction.ratio.offpeak (5 default). This will help reduce
the average number of files per store.

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