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Posted to commits@cassandra.apache.org by "Rishabh Saraswat (Jira)" <ji...@apache.org> on 2026/08/08 14:10:00 UTC
[jira] [Assigned] (CASSANDRA-21191) [CEP-59] Implementation of In-Band Connection Draining (Graceful Disconnect)
[ https://issues.apache.org/jira/browse/CASSANDRA-21191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rishabh Saraswat reassigned CASSANDRA-21191:
--------------------------------------------
Assignee: Rishabh Saraswat (was: Brad Schoening)
> [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: Rishabh Saraswat
> Priority: Normal
> Labels: cep-59, full-time, gsoc2026, mentor
> Attachments: PostCEP59.png, PreCEP59.png
>
>
> 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):*
> # *Server-Side:*
> * Modify the transport layer (specifically the Netty pipeline) to advertise and emit GRACEFUL_DISCONNECT on shutting down, as CEP-59 outlines.
> * Implement configurable timeouts to allow clients a grace period before hard closure.
> # *Python driver (potentially):*
> * Update the Python driver to opt-in and handle GRACEFUL_DISCONNECT.
> [Pre CEP 59 integration | https://issues.apache.org/jira/secure/attachment/13081579/PreCEP59.png]
> [Post CEP 59 integration | https://issues.apache.org/jira/secure/attachment/13081578/PostCEP59.png]
> *References:*
> * [CEP-59 Wiki|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=406619103]
> * [Discussion Thread |https://lists.apache.org/thread/wyswxql0zhj10nthn8pmjz40v03qfd5v]
> *See:*
> * [CASSJAVA-124|https://issues.apache.org/jira/browse/CASSJAVA-124] for java-driver implementation
> * [CASSPYTHON-16|https://issues.apache.org/jira/browse/CASSPYTHON-16] for python-driver implementation
> * [CASSCPP-7|https://issues.apache.org/jira/browse/CASSCPP-7] for c++-driver implementation
> * [CASSNODEJS-5|https://issues.apache.org/jira/browse/CASSNODEJS-5] for nodejs-driver implementation
> * [CASSGO-117|https://issues.apache.org/jira/browse/CASSGO-117] for Go-driver implementation
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