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https://issues.apache.org/jira/browse/CASSANDRA-9900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14646847#comment-14646847
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Yuki Morishita commented on CASSANDRA-9900:
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I see your point. +1.
A little comment on DTCS#groupSSTablesForAntiCompaction will help though, like
the one in LCS.
> Anticompaction can mix old and new data with DTCS in 2.2+
> ---------------------------------------------------------
>
> Key: CASSANDRA-9900
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9900
> Project: Cassandra
> Issue Type: Bug
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 2.2.x
>
> Attachments:
> 0001-avoid-mixing-new-and-old-data-in-anticompaction-with.patch
>
>
> since CASSANDRA-6851 we group sstables before running anticompaction on them
> to avoid increasing sstable count.
> We should not do this for DTCS as it can mix new and old data.
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