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https://issues.apache.org/jira/browse/CASSANDRA-13643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16109383#comment-16109383
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Jeff Jirsa commented on CASSANDRA-13643:
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Missing a fixver btw.
> converting expired ttl cells to tombstones causing unnecessary digest
> mismatches
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-13643
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13643
> Project: Cassandra
> Issue Type: Bug
> Reporter: Blake Eggleston
> Assignee: Blake Eggleston
> Priority: Minor
>
> In
> [{{AbstractCell#purge}}|https://github.com/apache/cassandra/blob/26e025804c6777a0d124dbc257747cba85b18f37/src/java/org/apache/cassandra/db/rows/AbstractCell.java#L77]
> , we convert expired ttl'd cells to tombstones, and set the the local
> deletion time to the cell's expiration time, less the ttl time. Depending on
> the timing of the purge, this can cause purge to generate tombstones that are
> otherwise purgeable. If compaction for a row with ttls isn't at the same
> state between replicas, this will then cause digest mismatches between
> logically identical rows, leading to unnecessary repair streaming and read
> repairs.
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