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https://issues.apache.org/jira/browse/CASSANDRA-6688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899212#comment-13899212
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Jonathan Ellis commented on CASSANDRA-6688:
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+1
> Avoid possible sstable overlaps with leveled compaction
> -------------------------------------------------------
>
> Key: CASSANDRA-6688
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6688
> Project: Cassandra
> Issue Type: Bug
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 2.0.6
>
> Attachments: 0001-6688.patch, 6688-v2.txt, 6688-v3.patch
>
>
> Two cases where we can end up with overlapping sstables in the leveled
> manifest;
> FIrst one is when we skip levels during compaction. Here we need to make sure
> we are not compacting in newLevel - 1 since if, for example, we are doing a
> L1 -> L2 compaction and then start a new L0 compaction where we decide to
> skip L1, we could have overlapping sstables in L2 when the compactions are
> done. This case is new in 2.0 since we check if we skip levels before the
> compaction starts.
> Second case is where we try to include as many overlapping L0 sstables as
> possible, here we could add sstables that are not compacting, but overlap
> sstables that are.
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