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Posted to issues@hbase.apache.org by "Nicolas Spiegelberg (Assigned) (JIRA)" <ji...@apache.org> on 2012/02/04 01:51:54 UTC

[jira] [Assigned] (HBASE-5332) Deterministic Compaction Jitter

     [ https://issues.apache.org/jira/browse/HBASE-5332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicolas Spiegelberg reassigned HBASE-5332:
------------------------------------------

    Assignee: Nicolas Spiegelberg
    
> Deterministic Compaction Jitter
> -------------------------------
>
>                 Key: HBASE-5332
>                 URL: https://issues.apache.org/jira/browse/HBASE-5332
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>
> Currently, we add jitter to a compaction using "delay + jitter*(1 - 2*Math.random())".  Since this is non-deterministic, we can get major compaction storms on server restart as half the Stores that were set to "delay + jitter" will now be set to "delay - jitter".  We need a more deterministic way to jitter major compactions so this information can persist across server restarts.

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