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Azure / azure-functions-servicebus-extension

Service Bus extension for Azure Functions
MIT License
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When topic subscription is disabled, service bus triggers generate thousands of exceptions per minute trying to reconnect #229

Closed GABRIELNGBTUC closed 7 months ago

GABRIELNGBTUC commented 9 months ago

Hello,

In our infrastructure, we have several functions using service bus triggers

Sometimes, we need to disable the subscriptions for a reason X or Y. Or the service bus becomes unavailable due to an Azure outage.

In those case, we see a massive amount of exceptions (Millions per hour) generated due to errors such as "{topicname}/{topicsubscriptionname} is disabled".

My question is if this behaviour is normal? I would expect that if the function is unable to connect to the service bus or a subscription for any reason, the error rate would be a few per 5/10s. Not that the function would try to connect once every few hundreds milliseconds and make you spend thousands of $ per day if you didn't set up an alert for this.

RohitRanjanMS commented 7 months ago

Hi @GABRIELNGBTUC ,

There's no way to reduce the volume of a specific type. You can filter-out these logs based on category and level, but that not what you want. You can set maxTelemetryItemsPerSecond to a right value, default is 20. This will impact all telemetry types as well.