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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9365) Optionally limit major compactions to off peak hours
Date Thu, 29 Aug 2013 09:30:52 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13753459#comment-13753459

Andrew Purtell commented on HBASE-9365:

Can we make the decision when to run major compaction pluggable? Then provide the current
decisionmaking as default. Then introduce the suggested policy in this issue.
> Optionally limit major compactions to off peak hours
> ----------------------------------------------------
>                 Key: HBASE-9365
>                 URL: https://issues.apache.org/jira/browse/HBASE-9365
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
> We already have off peak hours (where we set a more aggressive compaction ratio) and
periodic major compactions.
> It would be nice if we could limit this to off peak hours as well.
> A major compaction can be triggered in three ways:
> # a periodic chore checking every ~3h (10.000.000ms) by default
> # a minor compaction promoted to major because the last major compaction was too long
> # a minor compaction promoted to major (at the HStore level), because it touched all
HFiles anyway
> For case #1 and #2 we could could optionally return false from Store.isMajorCompaction(...)
when we're not in the off peak window. Would have a new config option to enforce that only
> In case #3 we're compacting all files anyway, so not need to interfere with that.
> Thoughts?

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