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https://issues.apache.org/jira/browse/CASSANDRA-1876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973390#action_12973390
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Jonathan Ellis commented on CASSANDRA-1876:
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If I'm understanding correctly, that means you'd still need to do 8 seeks
post-compaction to read the entire row, except in the edge case of each update
modifying every column.
> 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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