Benedict Elliott Smith created CASSANDRA-21361:
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Summary: Accord: Tail Latency Improvements
Key: CASSANDRA-21361
URL: https://issues.apache.org/jira/browse/CASSANDRA-21361
Project: Apache Cassandra
Issue Type: Improvement
Components: Accord
Reporter: Benedict Elliott Smith
Improve Tail Latency
- Introduce fast quorum medium path
- Mitigate convoy effect:
- ExecuteTxnBacklog v1 can execute single key transaction backlogs and
disseminate the result
- Direct local execution possible for single key transactions
- Use shardAppliedBefore instead of gcBefore to cleanup CFK faster
Also Improve:
- Introduce distributed tracing
- Combine RejectBefore and MaxConflicts
- Self-addressed messages are delivered directly
- ProtocolModifiers mostly final
Also Fix:
- BTree.XUpdater.reset()
- computeUnsyncedEpoch was incorrect
- Remove reject flag from MaxConflicts.Entry
- Requeue waiting state polling mode requeues from callbacks to avoid
crowding out other work
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