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Date: Thu, 15 Dec 2011 18:50:30 +0000 (UTC)
From: "Jonathan Ellis (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-3635) Throttle validation separately
 from other compaction
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    [ https://issues.apache.org/jira/browse/CASSANDRA-3635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170403#comment-13170403 ] 

Jonathan Ellis commented on CASSANDRA-3635:
-------------------------------------------

If you're i/o bound under size-tiered compaction you're kind of screwed since it does such a poor job of actually bucketing the same rows together.

I think we should get some feedback of the "here's what my workload like and this diminishes my repair pain" nature before committing this.  Again, I'm fine with posting a 0.8 version of the patch if that helps.
                
> Throttle validation separately from other compaction
> ----------------------------------------------------
>
>                 Key: CASSANDRA-3635
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3635
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>              Labels: repair
>             Fix For: 0.8.10, 1.0.7
>
>         Attachments: 0001-separate-validation-throttling.patch
>
>
> Validation compaction is fairly ressource intensive. It is possible to throttle it with other compaction, but there is cases where you really want to throttle it rather aggressively but don't necessarily want to have minor compactions throttled that much. The goal is to (optionally) allow to set a separate throttling value for validation.
> PS: I'm not pretending this will solve every repair problem or anything. 

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