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RedisServerException "ERR command is not allowed" after v3.4.0 update

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
csharp, redis
Domain
backend, databases

Research direction

Start in src/StackExchange.Redis/ConnectionMultiplexer.cs at GetEndpointsFromClusterNodes, around line 2165, where the exception originates. Check how cluster configuration is updated for non-clustered Azure Managed Redis and compare that behavior with v3.3.1. Done means the non-clustered resource no longer triggers the forbidden-command error while cluster endpoint discovery still works.

Written by the indexing model from the issue text.

Description

Since we upgraded to v3.4.0 we observe exceptions with error message Encountered error while updating cluster config: ERR command is not allowed and call stack:

StackExchange.Redis.RedisServerException:
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter.GetResult (System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at StackExchange.Redis.ConnectionMultiplexer+<GetEndpointsFromClusterNodes>d__176.MoveNext (StackExchange.Redis, Version=3.0.0.0, Culture=neutral, PublicKeyToken=c219ff1ca8c2ce46: /_/src/StackExchange.Redis/ConnectionMultiplexer.cs:2165)

We are using Azure Managed Redis non-clustered resource which might be the reason for the observed exception. Downgrading to v3.3.1 fixes the issue.

Dominant language
C#
Stars
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Forks
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Avg merge
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Merged PRs (30d)
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