redis-py Add pubsub support in asyncio Redis Cluster client

The Fix

pip install redis==7.1.0

Based on closed redis/redis-py issue #2289 · PR/commit linked

Production note: This usually shows up under retries/timeouts. Treat it as a side-effect risk until you can verify behavior with a canary + real traffic.

Open PR/Commit

@@ -24,6 +24,7 @@
     * Remove compatibility code for old versions of Hiredis, drop Packaging dependency
     * The `deprecated` library is no longer a dependency
+    * Enable Lock for asyncio cluster mode
 
 * 4.1.3 (Feb 8, 2022)

fix.md

Option A — Upgrade to fixed release\npip install redis==7.1.0\nWhen NOT to use: This fix should not be used if pubsub functionality is not required.\n\n

Why This Fix Works in Production

Trigger: Duplicate of https://github.com/redis/redis-py/issues/2219
Mechanism: The asyncio RedisCluster client lacked pubsub support due to missing lock functionality
Why the fix works: Enables AsyncIO cluster mode lock support, addressing the lack of pubsub functionality in the asyncio Redis Cluster client. (first fixed release: 7.1.0).

Production impact:

If left unfixed, retries/timeouts can trigger duplicate external side-effects (double charges, duplicate emails, repeated writes).

Why This Breaks in Prod

Shows up under Python 3.9 in real deployments (not just unit tests).
The asyncio RedisCluster client lacked pubsub support due to missing lock functionality
Production symptom (often without a traceback): Duplicate of https://github.com/redis/redis-py/issues/2219

Proof / Evidence

GitHub issue: #2289
Fix PR: https://github.com/redis/redis-py/pull/2446
First fixed release: 7.1.0
Reproduced locally: No (not executed)
Last verified: 2026-02-07
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.79

Discussion

High-signal excerpts from the issue thread (symptoms, repros, edge-cases).

Jump to Sources Open on GitHub

“Hi @coandco The lock() support was added in https://github.com/redis/redis-py/pull/2446 I've updated your ticket to reflect the current state.”

@uglide · 2023-02-08 · source

“Duplicate of https://github.com/redis/redis-py/issues/2219”

@uglide · 2023-06-15 · source

Failure Signature (Search String)

Duplicate of https://github.com/redis/redis-py/issues/2219

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Duplicate of https://github.com/redis/redis-py/issues/2219

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Duplicate of https://github.com/redis/redis-py/issues/2219

Environment

Python: 3.9

What Broke

Users experienced limited functionality in asyncio RedisCluster, impacting pubsub operations.

Why It Broke

The asyncio RedisCluster client lacked pubsub support due to missing lock functionality

Fix Options (Details)

Option A — Upgrade to fixed release Safe default (recommended)

pip install redis==7.1.0

When NOT to use: This fix should not be used if pubsub functionality is not required.

Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.

Fix reference: https://github.com/redis/redis-py/pull/2446

First fixed release: 7.1.0

Last verified: 2026-02-07. Validate in your environment.

When NOT to Use This Fix

This fix should not be used if pubsub functionality is not required.

Did This Fix Work in Your Case?

Quick signal helps us prioritize which fixes to verify and improve.

Prevention

Add a stress test that runs high-concurrency workloads and fails on thread dumps / blocked locks.
Enable watchdog dumps in prod (faulthandler, thread dump endpoint) to capture deadlocks quickly.

Version Compatibility Table

Version	Status
7.1.0	Fixed

Related Issues

No related fixes found.

Cluster: redis-py:duplicate-processing redis-py hub redis-py best practices All hubs All clusters

Related clusters: Configuration error Retry storm Data consistency

Sources

We don’t republish the full GitHub discussion text. Use the links above for context.

redis-py Add pubsub support in asyncio Redis Cluster client (Fix)