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Date: Wed, 30 Nov 2011 23:55:43 +0000 (UTC)
From: "Phabricator (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-4463) Run more aggressive compactions
 during off peak hours
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    [ 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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