ConnectionFactory.MaxMessageSize not used

[pabermod]

Hi,

I have set the value of ConnectionFactory.MaxMessageSize (either with a value larger or smaller than the default value of the server).

If I sent a bigger file than the limit, it is always comparing against the value defined in the rabbitmq server (or the default). The field is not being used.

If this is the expected behaviour, what is the field MaxMessageSize used for?

[michaelklishin]

Clients are not allowed to use a value higher than that used by the server.

This value is meant to be used for validation and it was introduced about three months ago #1218

[pabermod]

I tried to use this field to avoid sending a messge if its size is bigger. So there is no way to know from the client the max mesage size of the server?

[michaelklishin]

@lukebakken am I wrong about anything?

[lukebakken]

I don't believe client libraries have any knowledge of the server's maximum message size, because the value is not sent during the connection.tune phase of the AMQP handshake.

I'll have to check the code, but MaxMessageSize should be the maximum size of an AMQP message frame to prevent situations where a very large incoming or outgoing frame (or network bug) would cause the client library to try to request a huge amount of memory.

[lukebakken]

https://github.com/rabbitmq/rabbitmq-dotnet-client/blob/6.x/projects/RabbitMQ.Client/client/impl/Frame.cs#L247-L251