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

    [ https://issues.apache.org/jira/browse/CASSANDRA-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026649#comment-13026649
] 

Stu Hood edited comment on CASSANDRA-2558 at 4/28/11 7:27 PM:
--------------------------------------------------------------

There might be a bit of confusion with the current blurb about _what_ is highly recommended
(high/low/disabled/enabled), but other than that, +1.

EDIT: Also, it looks like the correct spelling is "compactor".

      was (Author: stuhood):
    There might be a bit of confusion with the current blurb about _what_ is highly recommended
(high/low/disabled/enabled), but other than that, +1.
  
> 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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