Celery Allow GroupResult.join timeout to be configurable in

The Fix

pip install celery==4.4.0rc5

Based on closed celery/celery issue #5349 · PR/commit linked

Production note: Most teams hit this during upgrades or environment changes. Roll out with a canary and smoke critical endpoints (health, OpenAPI/docs) before 100%.

Open PR/Commit

@@ -267,3 +267,4 @@ Bruno Alla, 2018/09/27
 Victor Mireyev, 2018/12/13
 Florian Chardin, 2018/10/23
+Shady Rafehi, 2019/02/20
diff --git a/celery/app/builtins.py b/celery/app/builtins.py
index cc0a41efab2..da200b757cd 100644

fix.md

Option A — Upgrade to fixed release\npip install celery==4.4.0rc5\nWhen NOT to use: This fix should not be used if the default timeout behavior is required.\n\n

Why This Fix Works in Production

Trigger: Allow GroupResult.join timeout to be configurable in celery.chord_unlock
Mechanism: Allows the timeout for GroupResult.join in celery.chord_unlock to be configurable, addressing unwanted timeouts due to latency or large result sets.
Why the fix works: Allows the timeout for GroupResult.join in celery.chord_unlock to be configurable, addressing unwanted timeouts due to latency or large result sets. (first fixed release: 4.4.0rc5).

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

Production symptom (often without a traceback): Allow GroupResult.join timeout to be configurable in celery.chord_unlock

Proof / Evidence

GitHub issue: #5349
Fix PR: https://github.com/celery/celery/pull/5348
First fixed release: 4.4.0rc5
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.62

Discussion

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

Jump to Sources Open on GitHub

“# Checklist - [x] I have checked the issues list for similar or identical enhancement to an existing feature. - [x] I have checked the commit log to find out if a the same enhancement was already implemented in master. # Brief Summary Pull”

Issue thread · issue description · source

Failure Signature (Search String)

Allow GroupResult.join timeout to be configurable in celery.chord_unlock
This change will solve the issue of unwanted timeouts caused when there's a moderate latency between the Celery workers and the configured backend or the result set to join is

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Allow GroupResult.join timeout to be configurable in celery.chord_unlock
This change will solve the issue of unwanted timeouts caused when there's a moderate latency between the Celery workers and the configured backend or the result set to join is relatively large (5000+ task results to join).

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Allow GroupResult.join timeout to be configurable in celery.chord_unlock
This change will solve the issue of unwanted timeouts caused when there's a moderate latency between the Celery workers and the configured backend or the result set to join is relatively large (5000+ task results to join).

What Broke

Unwanted timeouts occurred due to latency or large result sets when joining tasks.

Fix Options (Details)

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

pip install celery==4.4.0rc5

When NOT to use: This fix should not be used if the default timeout behavior is required.

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

Fix reference: https://github.com/celery/celery/pull/5348

First fixed release: 4.4.0rc5

Last verified: 2026-02-09. Validate in your environment.

When NOT to Use This Fix

This fix should not be used if the default timeout behavior is required.

Did This Fix Work in Your Case?

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

Prevention

Make timeouts explicit and test them (unit + integration) to avoid silent behavior changes.
Instrument retries (attempt count + reason) and alert on spikes to catch dependency slowdowns.

Version Compatibility Table

Version	Status
4.4.0rc5	Fixed

Related Issues

No related fixes found.

Cluster: celery:configuration-error Celery hub Celery best practices All hubs All clusters

Related clusters: Data consistency Duplicates Duplicate processing

Sources

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

Celery Allow GroupResult.join timeout to be configurable in celery.chord_unlock (Fix)