Azure Service Bus Function fails with "The lock supplied is invalid. Either the lock expired, or the message has already been removed from the queue."

Question

Hi.

Azure Service Bus Function (CompleteMessageAsync) Exception: "The lock supplied is invalid. Either the lock expired, or the message has already been removed from the queue."

Microsoft.Azure.Functions.Worker.Extensions.ServiceBus 5.22.0

Attr: [ServiceBusTrigger("%QueueName%", Connection = "ConnectionString", AutoCompleteMessages = false)]

Host.json:
"extensions": {
"serviceBus": {
"autoCompleteMessages": false,
"maxConcurrentCalls": 500
}}

Message lock duration: 5 minutes
Execution time of the failed function: 15 sec

The exception appears after handling 3-6 K messages (1K/6 min).
(sending ~ 1K or more to bus using a batched approach)

Also ... I found that performance fully degradaiting after an hour (some task execution > 5 min)

Could you help me, please?

Answer 1

Hi @Pavel Kusonski ,

The error happens because message locks expire before processing is finished, even with a 15-second runtime, due to high concurrency or prefetching.

• Increase maxAutoRenewDuration: Change this setting in host.json to extend the lock renewal time (up to 5 minutes):

"extensions": {
  "serviceBus": {
    "maxAutoRenewDuration": "00:05:00",
    "maxConcurrentCalls": 100  // Lower this if necessary
  }
}

• Set prefetchCount to 0 in host.json to prevent cached messages from losing their locks.
• Use RenewMessageLockAsync for messages that take a long time to process and add retry logic.

For more details, please refer to these documents:

Azure Service Bus message lock troubleshooting and Troubleshoot Azure Service Bus.

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