[BUG] InvalidOperationException: Trying to set an Activity that is not running.

[DFSko]

Describe the bug

A large number of InvalidOperationException exceptions are being thrown with the message: "Trying to set an Activity that is not running."

To Reproduce

Here's a MRE (Minimal Reproducible Example) of the issue:

• Configure FusionCache with Backplane.
• Set OpenTelemetry to use AlwaysOffSampler for sampling.
• Observe the InvalidOperationException related to Activity not running.

Expected behavior

No InvalidOperationException errors related to Activity should occur when using the specified configuration.

Versions

I've encountered this issue on:

• FusionCache version: 2.2.0
• .NET version: 9.0
• OS version: Ubuntu 24.04
• Others: OpenTelemetry with AlwaysOffSampler

Screenshots

Additional context

The issue appears when configuring the Backplane with FusionCache and using OpenTelemetry with the AlwaysOffSampler. The exceptions are related to attempts to set an Activity that is not in a running state.

[jodydonetti]

Hi @DFSko , thanks for reporting this.

I've found another issue which seems similar, here.

I'll try to take a closer look at this and will let you know.

One thing: you said that you are using the AlwaysOffSampler, I suppose to ignore all activities of some type, correct?
As a temporary mitigation, can you turn off the tracing you don't want when calling AddFusionCacheInstrumentation(options => ...) ?

Let me know, thanks.

[DFSko]

Hi @jodydonetti

Thank you for looking into this issue.

We are using AlwaysOffSampler to disable tracing to Grafana by default, enabling it only when necessary for specific debugging scenarios.

Regarding AddFusionCacheInstrumentation, we are not using it, as we have not integrated the ZiggyCreatures.FusionCache.OpenTelemetry library in our setup.

Please let me know if you need any additional details or logs to help investigate further.

[jodydonetti]

Hi all, v2.4.0 has been released 🥳