A note may need to be added to this page to show the max size of the event in output binding is 256KB.

[WalterWu-AppService]

According to the following 2 links, the max size of Event Hubs event in output binding is 256KB. Could you please update the page to notice this limitation?

Event Hubs Basic and Standard - quotas and limits:
https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-quotas#event-hubs-basic-and-standard---quotas-and-limits

EventHub max size is hardcoded 256KB:
Azure/azure-functions-eventhubs-extension#24

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Document Details

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• ID: 0b24ff8d-a59e-01e0-205d-ac777f06bb7a
• Version Independent ID: f2106a8a-28fe-ebdf-525e-1d93013778fa
• Content: Azure Event Hubs bindings for Azure Functions
• Content Source: articles/azure-functions/functions-bindings-event-hubs.md
• Service: azure-functions
• GitHub Login: @craigshoemaker
• Microsoft Alias: cshoe

[DixitArora-MSFT]

Hi @WalterWu-AppService Thanks for your feedback. We will review and update as appropriate.

[DixitArora-MSFT]

@WalterWu-AppService PR has been created for this which will address this. Thanks so much for providing the feedback that help us in improving the documentation. For now I will proceed with closure of this and If there are further questions regarding this matter, please tag me in your reply. We will gladly continue the discussion and we will reopen the issue.

[brnn8r]

Shouldn't this documentation https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-hubs-output?tabs=python mention that the limit for an azure function output binding is 240 * 1024 bytes as per https://github.com/Azure/azure-functions-eventhubs-extension/blob/master/src/Microsoft.Azure.WebJobs.Extensions.EventHubs/Triggers/EventHubAsyncCollector.cs#L27

It's not clear from the documentation that you will run into an error sending a message over 240Kb. Especially seeing as a standard event hub should allow for a message up to 1Mb.