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Date: Thu, 28 Apr 2011 18:05:03 +0000 (UTC)
From: "Ryan King (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-2558) Add "concurrent_compactions"
 configuration
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    [ https://issues.apache.org/jira/browse/CASSANDRA-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026392#comment-13026392 ] 

Ryan King commented on CASSANDRA-2558:
--------------------------------------

I believe Terje had compaction turned off during a bulk import. Those compactions happened when compaction was reactivated.

> Add "concurrent_compactions" configuration
> ------------------------------------------
>
>                 Key: CASSANDRA-2558
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2558
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8 beta 1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Trivial
>             Fix For: 0.8.1
>
>         Attachments: 0001-Make-compaction-thread-number-configurable.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> We should expose a way to configure the max number of thread to use when multi_threaded compaction is turned on. So far, it uses nb_of_processors thread, which if you have many cores may be unreasonably high (as far as random IO is concerned and thus independently of compaction throttling)... at least unless you have SSD.

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