The Fix
pip install redis==7.1.0
Based on closed redis/redis-py issue #2226 · 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%.
@@ -310,7 +310,8 @@ def parse_xclaim(response, **options):
if options.get("parse_justid", False):
return response[1]
- return parse_stream_list(response[1])
+ response[1] = parse_stream_list(response[1])
+ return response
Option A — Upgrade to fixed release\npip install redis==7.1.0\nWhen NOT to use: Do not use this fix if you require the original behavior of discarding the first element.\n\n
Why This Fix Works in Production
- Trigger: The application cannot determine the start ID for subsequent XAUTOCLAIM calls, leading to potential message processing issues.
- Mechanism: The redis-py library incorrectly discards the first element of the XAUTOCLAIM response array
- Why the fix works: Fixes the issue where `XAUTOCLAIM` did not return the full response, specifically the ID of the last scanned stream item. (first fixed release: 7.1.0).
- 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 3.9 in real deployments (not just unit tests).
- The redis-py library incorrectly discards the first element of the XAUTOCLAIM response array
- Production symptom (often without a traceback): The application cannot determine the start ID for subsequent XAUTOCLAIM calls, leading to potential message processing issues.
Proof / Evidence
- GitHub issue: #2226
- Fix PR: https://github.com/redis/redis-py/pull/2252
- First fixed release: 7.1.0
- Reproduced locally: No (not executed)
- Last verified: 2026-02-07
- Confidence: 0.95
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.77
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“@vvnekb Thanks for reporting this issue! I don't know what is the reason to return only the second element on the response and I think…”
Failure Signature (Search String)
- The application cannot determine the start ID for subsequent XAUTOCLAIM calls, leading to potential message processing issues.
Copy-friendly signature
Failure Signature
-----------------
The application cannot determine the start ID for subsequent XAUTOCLAIM calls, leading to potential message processing issues.
Error Message
Signature-only (no traceback captured)
Error Message
-------------
The application cannot determine the start ID for subsequent XAUTOCLAIM calls, leading to potential message processing issues.
Environment
- Python: 3.9
What Broke
The application cannot determine the start ID for subsequent XAUTOCLAIM calls, leading to potential message processing issues.
Why It Broke
The redis-py library incorrectly discards the first element of the XAUTOCLAIM response array
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install redis==7.1.0
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/2252
First fixed release: 7.1.0
Last verified: 2026-02-07. Validate in your environment.
When NOT to Use This Fix
- Do not use this fix if you require the original behavior of discarding the first element.
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.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.