[jira] [Created] (CASSANDRA-14666) Race condition in AbstractReplicationStrategy.getNaturalReplicas

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

Benedict created CASSANDRA-14666:
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             Summary: Race condition in AbstractReplicationStrategy.getNaturalReplicas
                 Key: CASSANDRA-14666
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14666
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Benedict
            Assignee: Benedict
             Fix For: 3.0.x, 3.11.x, 4.0.x


There is a very narrow and infrequent race window, in which two ring updates occur in a short space of time (or during an interval of no queries):

- thread A invalidates the cache after the first ring change, snapshots this version of the ring, and begins to calculate its natural endpoints
- thread B sees the second ring change, and invalidates the cache before thread A completes
- thread A writes its value to the cache, based on the old ring layout

Now, a stale view of the endpoints for this token will be persisted in AbstractReplicationStrategy until the next ring change (which may feasibly never occur)




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