Sam Tunnicliffe created CASSANDRA-15461:
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             Summary: Legacy counter shards can cause false positives in 
repaired data tracking
                 Key: CASSANDRA-15461
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15461
             Project: Cassandra
          Issue Type: Bug
          Components: Observability/Metrics
            Reporter: Sam Tunnicliffe
            Assignee: Sam Tunnicliffe


It is expected that the serialization of legacy (pre-2.1) counter cells may 
differ across replicas due to the remote vs local designation of the shards. 
This will cause the repaired data digests calculated at read time to differ 
where certain legacy shards are encountered. This does not, however, indicate 
corruption of the repaired dataset and there isn't any action that operators 
can take in this scenario. Excluding counter cells which contain legacy shards 
from the digest calculation will avoid false positives.




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