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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2558) Add "concurrent_compactions" configuration
Date Fri, 29 Apr 2011 15:03:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027010#comment-13027010
] 

Jonathan Ellis commented on CASSANDRA-2558:
-------------------------------------------

bq. An alternative would be to simply throw a ConfigurationException if the provided number
is <= 0, if what we want is avoiding silent correction.

Sounds good.

> 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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