[jira] [Created] (CASSANDRA-13643) converting expired ttl cells to tombstones causing unnecessary digest mismatches

["Blake Eggleston (JIRA)" <ji...@apache.org>]

Blake Eggleston created CASSANDRA-13643:
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             Summary: 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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