Add a proper retry mechanism for counters in case of failed request
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                 Key: CASSANDRA-2495
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2495
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
    Affects Versions: 0.8
            Reporter: Sylvain Lebresne


Contrarily to standard insert, counter increments are not idempotent. As such, 
replaying a counter mutation when a TimeoutException occurs could lead to an 
over-count. This alone limits the use cases for which counters are a viable 
solution, so we should try to come up with a mechanism that allow the replay of 
a failed counter mutation without the risk of over-count. 

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