Nivy created CASSANDRA-21102:
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             Summary: Fix off-by-one bug in exponential backoff for repair 
retry config
                 Key: CASSANDRA-21102
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21102
             Project: Apache Cassandra
          Issue Type: Bug
            Reporter: Nivy
            Assignee: Nivy


The lower bound for repair retry backoff is multiplied by 2^attempts, but 
attempts always starts at 1. This means we always wait (at minimum) twice as 
long for the first retry attempt.

Rather than modify the complex regex string defining retries, we can modify 
LatencyModifier to interpret this exponent as max(0, attempts - 1).



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