redis-py Add support for missing command LATENCY DOCTOR

The Fix

pip install redis==7.1.0

Based on closed redis/redis-py issue #1977 · PR/commit linked

Production note: Watch p95/p99 latency and retry volume; timeouts can turn into retry storms and duplicate side-effects.

Open PR/Commit

@@ -980,6 +980,34 @@ def lastsave(self, **kwargs) -> ResponseT:
         return self.execute_command("LASTSAVE", **kwargs)
 
+    def latency_doctor(self):
+        """Raise a NotImplementedError, as the client will not support LATENCY DOCTOR.
+        This funcion is best used within the redis-cli.

fix.md

Option A — Upgrade to fixed release\npip install redis==7.1.0\nWhen NOT to use: This fix is not applicable if the client is expected to support LATENCY DOCTOR functionality.\n\n

Why This Fix Works in Production

Trigger: Add support for missing command LATENCY DOCTOR
Mechanism: LATENCY DOCTOR command was not implemented in the client, leading to unsupported command errors
Why the fix works: Added support for the LATENCY DOCTOR command by raising NotImplementedError in the client. (first fixed release: 7.1.0).

Production impact:

If left unfixed, tail latency can spike under load and surface as timeouts/retries (amplifying incident impact).

Why This Breaks in Prod

LATENCY DOCTOR command was not implemented in the client, leading to unsupported command errors
Production symptom (often without a traceback): Add support for missing command LATENCY DOCTOR

Proof / Evidence

GitHub issue: #1977
Fix PR: https://github.com/redis/redis-py/pull/2501
First fixed release: 7.1.0
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.85
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.74

Discussion

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

Jump to Sources Open on GitHub

Failure Signature (Search String)

Add support for missing command LATENCY DOCTOR

Copy-friendly signature

signature.txt

Failure Signature
-----------------
Add support for missing command LATENCY DOCTOR

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
Add support for missing command LATENCY DOCTOR

What Broke

Clients attempting to use LATENCY DOCTOR received NotImplementedError exceptions.

Why It Broke

LATENCY DOCTOR command was not implemented in the client, leading to unsupported command errors

Fix Options (Details)

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

pip install redis==7.1.0

When NOT to use: This fix is not applicable if the client is expected to support LATENCY DOCTOR functionality.

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/2501

First fixed release: 7.1.0

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

When NOT to Use This Fix

This fix is not applicable if the client is expected to support LATENCY DOCTOR functionality.

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:latency 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 support for missing command LATENCY DOCTOR (Fix)