[jira] [Updated] (CASSANDRA-21361) Accord: Tail Latency Improvements

["Benedict Elliott Smith (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-21361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict Elliott Smith updated CASSANDRA-21361:
-----------------------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Triage Needed)

> 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
>            Priority: Normal
>
>     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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