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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-2558) Add "concurrent_compactions" configuration
Date Wed, 04 May 2011 07:22:03 GMT


Sylvain Lebresne commented on CASSANDRA-2558:

bq. You still have a "compacters" in the sample config file.

Fixed (in current 0.8 branch and trunk).

bq. I also see that when I set compactors to 6, I get 7 tmp files. 

Are you sure one the tmp file is not the current memtable being flushed ? Because I really
don't see where there could be an offset problem.

Thanks for the testing.

> Add "concurrent_compactions" configuration
> ------------------------------------------
>                 Key: CASSANDRA-2558
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8 beta 1
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Trivial
>             Fix For: 0.8.0 beta 2
>         Attachments: 0001-Make-compaction-thread-number-configurable-v2.patch, 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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