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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1876) Allow minor Parallel Compaction
Date Mon, 20 Dec 2010 13:39:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973194#action_12973194
] 

Jonathan Ellis commented on CASSANDRA-1876:
-------------------------------------------

I don't think that's going to be much of a win -- checking the filter is the fast part; it's
merging different row versions that is expensive.

> Allow minor Parallel Compaction
> -------------------------------
>
>                 Key: CASSANDRA-1876
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1876
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Germán Kondolf
>            Priority: Minor
>         Attachments: 1876-reformatted.txt, compactionPatch-V2.txt
>
>
> Hi,
> According to the dev's list discussion (1) I've patched the CompactionManager to allow
parallel compaction.
> Mainly it splits the sstables to compact in the desired buckets, configured by a new
parameter: compaction_parallelism with the current default of "1".
> Then, it just submits the units of work to a new executor and waits for the finalization.
> The patch was created in the trunk, so I don't know the exact affected version, I assume
that is 0.8.
> I'll try to apply this patch to 0.6.X also for my current production installation, and
then reattach it.
> (1) http://markmail.org/thread/cldnqfh3s3nufnke

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