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https://issues.apache.org/jira/browse/CASSANDRA-5722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13710290#comment-13710290
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Tyler Hobbs commented on CASSANDRA-5722:
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bq. If you think about it, you can see why that might be so – we only have to
scan extra rows on a bloom filter false positive. The common case by the time
we start looping through rows is that the row we're looking for exists.
Ahh, that makes perfect sense. Thanks!
bq. I can squash it down and commit if you're good with the changes.
+1, sounds good.
> Cleanup should skip sstables that don't contain data outside a nodes ranges
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-5722
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5722
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Nick Bailey
> Assignee: Tyler Hobbs
> Fix For: 2.0.1
>
> Attachments: 0001-Skip-cleanup-when-unneeded.patch
>
>
> Right now cleanup is optimized to simply delete sstables that *only* contain
> data that doesn't belong on the node, for all other sstables though, it will
> read them, check each row, and write out new sstables.
> Cleanup could be optimized to look at an sstable and determine that all data
> within the sstable does belong on a node, and therefore skip re-writing that
> sstable. This would make cleanup essentially a noop in the case where all
> data on a node belongs on that node.
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