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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2015/05/25 09:18:17 UTC

[jira] [Created] (CASSANDRA-9470) Employ MS Negative Acks to report dropped operations to coordinators

Benedict created CASSANDRA-9470:
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             Summary: Employ MS Negative Acks to report dropped operations to coordinators
                 Key: CASSANDRA-9470
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9470
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Benedict


Along with CASSANDRA-9469, we can improve Cassandra's stability under overload by immediately reporting to coordinators that mutations or responses they are waiting on will not be delivered due to system overload. Initially this just permits query failure, reouting or hinting to occur promptly, eliminating temporary state on the coordinator. However if failure reasons are reported along with the NegAck, we can proactively reroute messages to nodes that have had the fewest NegAck's due to overload recently (perhaps as a new, or modified, DynamicSnitch)



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