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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4463) Run more aggressive compactions during off peak hours
Date Sun, 25 Sep 2011 01:44:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114116#comment-13114116
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Kannan Muthukkaruppan commented on HBASE-4463:
----------------------------------------------

Dhruba: Just wanted to point out that one knob that exists today to throttle the number of
concurrent compactions is the size of the compaction thread pools. We can drop it all the
way down to 1 thread. If further throttling is needed, then it'll require some new scheme.

> 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
>
> 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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