How to configure MAX_MSG_SIZE?

[Giri Chintala]

is it possible to override MAX_MSG_SIZE defined in rabbit.hrl ? I am trying to lower the value.

[Michael Klishin]

It's a compile time constant.

On Tue, 20 Jun 2017 at 23:48, Giri Chintala <chintala....@gmail.com> wrote:

is it possible to override MAX_MSG_SIZE defined in rabbit.hrl ? I am trying to lower the value.

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Staff Software Engineer, Pivotal/RabbitMQ

[Giri Chintala]

Thanks Michael for quick response.

is it possible to externalize it in future releases?

[Michael Klishin]

There is very little demand for it being configurable. It's a value on the hot path

for publishing, so we think a few times before introducing more code that may be

reaching out to configuration.

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[Giri Chintala]

Default value 1MB is not huge, But misbehaving Producer can bring down Broker by sending large messages.

I believe RabbitMQ is being widely used as broker to exchange small size messages(few KBs), not as a persistent storage.

Configurable MAX_MSG_SIZE helps us protect broker from misbehaving Producers.

On Tuesday, June 20, 2017 at 5:43:29 PM UTC-4, Michael Klishin wrote:

There is very little demand for it being configurable. It's a value on the hot path

for publishing, so we think a few times before introducing more code that may be

reaching out to configuration.

On Wed, Jun 21, 2017 at 12:26 AM, Giri Chintala <vsg.ch...@gmail.com> wrote:

Thanks Michael for quick response.

is it possible to externalize it in future releases?

On Tuesday, June 20, 2017 at 5:20:10 PM UTC-4, Michael Klishin wrote:

It's a compile time constant.

On Tue, 20 Jun 2017 at 23:48, Giri Chintala <chintala....@gmail.com> wrote:

is it possible to override MAX_MSG_SIZE defined in rabbit.hrl ? I am trying to lower the value.

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[Michael Klishin]

Default value is 2147383648, which is 2 GiB (~ 2 GB).

A plugin that implements a channel interceptor can do this kind of limiting

but it will

 * Affect throughput a bit

 * Conflict with any other plugins that use channel interceptors, such as message-timestamp and routing-node-stamp

HAproxy offers a fair number of rate limiting options, see e.g. http://blog.serverfault.com/2010/08/26/1016491873/.

I assume many of them should work in TCP mode as well.

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[Giri Chintala]

I misunderstood source code 2GB Message size is pretty high for a Broker. 

I guess HA Proxy can limit rates and size.

For now, we can edit source code and compile it. 

But, Please consider making configurable if it is a simple change.