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https://issues.apache.org/jira/browse/CASSANDRA-21191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rishabh Saraswat updated CASSANDRA-21191:
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Labels: full-time gsoc2026 mentor (was: gsoc2026 large mentor)
> [CEP-59] Implementation of In-Band Connection Draining (Graceful Disconnect)
> ----------------------------------------------------------------------------
>
> Key: CASSANDRA-21191
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21191
> Project: Apache Cassandra
> Issue Type: New Feature
> Components: Messaging/Client, Tool/cqlsh
> Reporter: Rishabh Saraswat
> Assignee: Jane He
> Priority: Normal
> Labels: full-time, gsoc2026, mentor
>
> This ticket covers the implementation of the server-side logic and protocol
> extensions defined in {*}CEP-59: Graceful Disconnect – In-Band Connection
> Draining for Node Shutdown{*}.
> *Goal:*
> Currently, when a Cassandra node shuts down or drains, client connections are
> often terminated abruptly, leading to failed requests. CEP-59 proposes an
> "in-band" signal (GRACEFUL_DISCONNECT) to notify clients before the socket is
> closed, allowing them to stop sending new requests and wait for pending ones
> to complete.
> *Proposed Scope (Implementation):*
> # *Native Protocol:* Add the new GRACEFUL_DISCONNECT event/message type to
> the Native Protocol (targeted for the next protocol version).
> # *Server-Side (Java):*
> * Modify the transport layer (specifically the Netty pipeline) to broadcast
> the disconnect signal to all active channels during the
> StorageService.drain() sequence.
> * Implement configurable timeouts to allow clients a grace period before
> hard closure.
> # *Tooling (cqlsh/Python):*
> * Update the Python driver/cqlsh to handle the new signal, ensuring users
> see a clean message rather than a stack trace during node maintenance.
> *References:*
> * [CEP-59
> Wiki|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=406619103]
> * [Discussion Thread
> |https://lists.apache.org/thread/wyswxql0zhj10nthn8pmjz40v03qfd5v]
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