Symptoms
Consider the following scenario:
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The pricing tier for your Event Hub allows events that have a data size that's greater than 256 kilobytes (KB).
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You use the Event Hub send adapter to publish an event to Azure Event Hubs.
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The data size of the event is greater than 256 KB.
In this situation, you receive an error message that resembles the following message:
Too large message with size of {0} bytes cannot be sent to Event Hubs.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Resolution
This problem is fixed in the following cumulative update for BizTalk Server:
References
For information about the service packs and cumulative update list for BizTalk Server, see the following article in the Microsoft Knowledge Base:
2555976 Service pack and cumulative update list for BizTalk Server
For more information about BizTalk Server hotfixes, see the following article in the Microsoft Knowledge Base:
2003907 Information about BizTalk hotfixes and Cumulative Update support