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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 Wed, 30 Nov 2011 23:55:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160481#comment-13160481
] 

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

Karthik has committed the revision "HBASE-4463 [jira] Run more aggressive compactions during
off peak hours".

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

COMMIT
  https://reviews.facebook.net/rHBASE1208885

                
> 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
>             Fix For: 0.94.0
>
>         Attachments: HBASE-4463.D471.1.patch, HBASE-4463.D471.2.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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