CreateReplaySafeLogger usage

Question

We have a code that uses the fan-out/fan -in approach of Azure Durable Functions.

The main Orchestrator Function is calling Sub Orchestrator Functions from it. We are using logging in the main Orchestrator Function as well as the Sub Orchestrator functions that get called from the main Orchestrator Function.

Do we need to use the CreateReplaySafeLogger in both Main Orchestrator Function as well as the Sub Orchestrator Functions.

public async Task<Dictionary<string, string>> RunOrchestrator([OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)
{
        var logger = context.CreateReplaySafeLogger(log); 
}

Please Suggest as to what is the correct approach

Answer 1

@suvra panda ,

Thanks for reaching out to Q&A.

It is better to use CreateReplaySafeLogger method in both orchestrator and sub-orchestrator methods. We know that this method returns an instance of ILogger that is replay safe. There are chances that the sub-orchestrator will replay its activity functions so it is safe to use CreateReplaySafeLogger method to avoid duplicate logs.

https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.webjobs.extensions.durabletask.durablecontextextensions.createreplaysafelogger?view=azure-dotnet

I hope this helps!

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