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https://issues.apache.org/jira/browse/CASSANDRA-21265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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shanizta siddiqua updated CASSANDRA-21265:
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Labels: cep-59 gsoc2026 (was: )
> [GSoC 2026] CEP-59: Self-Draining Graceful Disconnect via cleanup()
> Callback
> ----------------------------------------------------------------------------------
>
> Key: CASSANDRA-21265
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21265
> Project: Apache Cassandra
> Issue Type: New Feature
> Components: Messaging/Client
> Reporter: shanizta siddiqua
> Assignee: shanizta siddiqua
> Priority: Normal
> Labels: cep-59, gsoc2026
>
> This proposal takes a driver-first approach to CEP-59, with a self-draining
> connection mechanism that hooks into CQLMessageHandler's existing cleanup()
> callback and per-connection channelPayloadBytesInFlight counter.
> Server-side: Four-phase shutdown (SEAL → SIGNAL → DRAIN → DEADLINE). Each
> connection closes itself via three conditions in the existing cleanup()
> callback:
> if (!isRunning && bytesInFlight == 0 && gracePeriodElapsed()) channel.close();
> The gracePeriodElapsed() condition addresses network-latent requests still in
> the TCP pipe (identified during design review with Jane He).
> Driver-side: New DRAINING host state (distinct from DOWN) with policy
> integration across LoadBalancingPolicy, ReconnectionPolicy, RetryPolicy, and
> SpeculativeExecutionPolicy.
> See CEP-59 spec:
> [https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=406619103]
> Related: CASSANDRA-21191
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