redis-py redis.exceptions.ConnectionError with 4.5.2 (Fix)

The Fix

pip install redis==7.1.0

Based on closed redis/redis-py issue #2636 · 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.

Jump to Verify Open PR/Commit

@@ -1,3 +1,4 @@
@@ -1,3 +1,4 @@
+    * Revert #2104, #2673, add `disconnect_on_error` option to `read_response()` (issues #2506, #2624)
     * Add `address_remap` parameter to `RedisCluster`
     * Fix incorrect usage of once flag in async Sentinel

repro.py

3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/worker/consumer/consumer.py", line 326, in start
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR blueprint.start(self)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/bootsteps.py", line 116, in start
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR step.start(parent)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/worker/consumer/consumer.py", line 618, in start
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR c.loop(*c.loop_args())
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/worker/loops.py", line 81, in asynloop
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR next(loop)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/asynchronous/hub.py", line 361, in create_loop
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR cb(*cbargs)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 1128, in on_readable
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR self.cycle.on_readable(fileno)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 398, in on_readable
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR chan.handlers[type]()
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 733, in _receive
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ret.append(self._receive_one(c))
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 743, in _receive_one
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR response = c.parse_response()
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1531, in parse_response
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR response = self._execute(conn, try_read)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1507, in _execute
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR return conn.retry.call_with_retry(
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/retry.py", line 49, in call_with_retry
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR fail(error)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1509, in <lambda>
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR lambda error: self._disconnect_raise_connect(conn, error),
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1496, in _disconnect_raise_connect
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR raise error
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/retry.py", line 46, in call_with_retry
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR return do()
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py"
... (truncated) ...

verify

Re-run the minimal reproduction on your broken version, then apply the fix and re-run.

fix.md

Option A — Upgrade to fixed release\npip install redis==7.1.0\nWhen NOT to use: This fix should not be applied if the application relies on immediate disconnection behavior.\n\n

Why This Fix Works in Production

Trigger: redis.exceptions.ConnectionError with 4.5.2
Mechanism: Adds an option to disable disconnects in the read_response method, addressing issues related to connection errors.
Why the fix works: Adds an option to disable disconnects in the read_response method, addressing issues related to connection errors. (first fixed release: 7.1.0).

Production impact:

If left unfixed, the same config can fail only in production (env differences), causing startup failures or partial feature outages.

Why This Breaks in Prod

Shows up under Python 3.11 in real deployments (not just unit tests).
Surfaces as: redis.exceptions.ConnectionError with 4.5.2

Proof / Evidence

GitHub issue: #2636
Fix PR: https://github.com/redis/redis-py/pull/2695
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: 0.36

Discussion

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

Jump to Sources Open on GitHub

“Closing as there is no response. If this is still relevant, please reopen.”

@dvora-h · 2024-01-21 · confirmation · source

“Duplicate of https://github.com/redis/redis-py/issues/2629 Edit: or maybe not because from the trace it seems the socket connection was made.”

@woutdenolf · 2023-03-24 · source

“Hi @woutdenolf I did an upgrade to redis-py 4.5.4 today, but sadly the issue above is still there and connection will be closed by server.”

@eldom9 · 2023-05-01 · source

“Nothing obvious comes to mind. I'm using celery with redis just fine (celery 5.3, py-redis 4.5.4, redis-server 6.0). Could you provide a way to reproduce…”

@woutdenolf · 2023-05-01 · source

Failure Signature (Search String)

redis.exceptions.ConnectionError with 4.5.2

Error Message

Stack trace

error.txt

Error Message
-------------
redis.exceptions.ConnectionError with 4.5.2

Minimal Reproduction

repro.py

3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/worker/consumer/consumer.py", line 326, in start
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR blueprint.start(self)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/bootsteps.py", line 116, in start
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR step.start(parent)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/worker/consumer/consumer.py", line 618, in start
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR c.loop(*c.loop_args())
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/celery/worker/loops.py", line 81, in asynloop
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR next(loop)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/asynchronous/hub.py", line 361, in create_loop
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR cb(*cbargs)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 1128, in on_readable
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR self.cycle.on_readable(fileno)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 398, in on_readable
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR chan.handlers[type]()
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 733, in _receive
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ret.append(self._receive_one(c))
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/kombu/transport/redis.py", line 743, in _receive_one
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR response = c.parse_response()
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1531, in parse_response
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR response = self._execute(conn, try_read)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1507, in _execute
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR return conn.retry.call_with_retry(
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/retry.py", line 49, in call_with_retry
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR fail(error)
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1509, in <lambda>
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR lambda error: self._disconnect_raise_connect(conn, error),
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py", line 1496, in _disconnect_raise_connect
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR raise error
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/retry.py", line 46, in call_with_retry
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR return do()
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR ^^^^
3/21/2023, 8:48:29 PM [APP/PROC/WEB/0] ERR File "/usr/local/lib/python3.11/site-packages/redis/client.py"
... (truncated) ...

Environment

Python: 3.11

What Broke

Django/Celery app experiences connection errors leading to task failures and closed connections.

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 applied if the application relies on immediate disconnection behavior.

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/2695

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 applied if the application relies on immediate disconnection behavior.

Verify Fix

verify

Re-run the minimal reproduction on your broken version, then apply the fix and re-run.

Did This Fix Work in Your Case?

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

Prevention

Capture the exact failing error string in logs and tests so you can reproduce via a minimal script.
Pin production dependencies and upgrade only with a reproducible test that hits the failing path.

Version Compatibility Table

Version	Status
7.1.0	Fixed

Related Issues

No related fixes found.

Cluster: redis-py:configuration-error redis-py hub redis-py best practices All hubs All clusters

Related clusters: Retry storm Data consistency Race condition

Sources

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