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https://issues.apache.org/jira/browse/HBASE-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151849#comment-13151849
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Phabricator commented on HBASE-4463:
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nspiegelberg has commented on the revision "HBASE-4463 [jira] Run more
aggressive compactions during off peak hours".
@ted : I think allowing minute-level granularity might be little over
optimizing. It just means that aggressive compact selection ends then. An
agressive compaction can be sitting in the compaction queue and actually
executing after the ending time. Therefore, you want to disable aggressive
compactions a decent bit of time before your traffic begins to pick up.
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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