What's the recommended max replicaTimeout for Azure ContainerApps Jobs?

Question

I've been enjoying using Azure Container Apps for my web service and am considering running a long-running job using the Azure Container Apps Jobs feature. I haven't been able to find a good answer to this basic product question though: "What's the longest (or longest recommended) replicaTimeout I can set for a Container App Job?"

Some googling shows another user having trouble at 10 hours runtime. According to this question, the default is 30 minutes. Should I be comfortable running 30-120 minute apps, but worried running a 10+ hour job? What's the theoretical max timeout I could set?

Answer 1

Hello @Zach Howell

The replicaTimeout in Azure Container Apps Jobs is a configuration that determines how long a job replica can run before it’s considered failed and stopped. The default replicaTimeout value is set to 30 minutes

You can set a different value for replicaTimeout at the time of job creation using the --replica-timeout parameter with the CLI. After creation, you can also adjust the replicaTimeout value via the Azure portal by clicking on the Configuration menu

However, there isn’t a specific recommended maximum replicaTimeout value mentioned in the Azure documentation. The appropriate replicaTimeout would largely depend on the nature of your job. If your job is expected to run for a longer duration (like a few hours), you can set the replicaTimeout accordingly.

Please note that setting a very high replicaTimeout might not be ideal if your job is not expected to run for such a long duration, as it could lead to unnecessary resource usage if the job hangs or encounters an issue. It’s always a good practice to estimate the expected duration of your job and set the replicaTimeout slightly higher than that to allow for any unexpected delays.

As for running a 10+ hour job, it’s important to ensure that your job is designed to handle long-running tasks efficiently. I'd recommend using Durable Azure Functions here.

Remember, Azure Container Apps Jobs are designed for tasks that start, run for a finite duration, and exit when finished

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