Azure functions activity trigger calls not running concurrently

Question

I am giving multiple calls to the Azure activity function from a durable function.

The multiple calls are done and appended to a list and later all calls are fetched using yield to context.task_all

I have the below observations:

• I ran the same code on my local environment and used a print statement to get the time of each call. The activity functions are running concurrently in the local environment.
• When the same code is deployed to the test environment and monitored then found that activity function calls are not running concurrently.

For resolving, I tried multiple ways but none of them seems to work. Below are a few steps taken.

• Use the async keyword while defining activity function but still, the code flow is not concurrent.
• Updated host.json

The host.json contains the below section already in my case

"concurrency": {
    "dynamicConcurrencyEnabled": true,
    "snapshotPersistenceEnabled": true
  }

I added maxConcurrentActivityFunction

"durableTask": {
      "maxConcurrentActivityFunctions":4
    }

maxConcurrentActivityFunction impacted the concurrency flow on my local environment but again no impact on the test environment.

Please help me identify the reason for this behavior and the steps I can take to make sure my activity function calls run concurrently even for a few calls or a large number of calls.

Thanks in advance!!

Answer 1

The issue was resolved after I added configuration for FUNCTIONS_WORKER_PROCESS_COUNT in azure function app.