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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-2558) Add "concurrent_compactions" configuration
Date Thu, 28 Apr 2011 19:38:03 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stu Hood updated CASSANDRA-2558:
--------------------------------

    Comment: was deleted

(was: > does concurrent_compactors=0 disable compaction?
That is currently the magic value for "let Cassandra decide". IMO, disabling compaction entirely
shouldn't be easy.)

> 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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