[rabbitmq-discuss] When disk usage is below threshold, how do I prevent my consumers from blocking when closing a channel?

Mauro Gandelli mauro.gandelli at gmail.com
Thu Apr 3 16:47:57 BST 2014

On my application, after calling IModel.BasicPublish(); , if I call 
IModel.Close() afterwards the app blocks.

In my development machine I noticed that the call unlocks and proceeds when 
I free disk space above threshold (that's how I figured out that it was the 
Flow Control mechanism that blocked my connection). In the production 
environment I need my clients not to block when this happens.

According to this article <https://www.rabbitmq.com/memory.html> on Flow 

There are two flow control mechanisms in RabbitMQ. Both work by exerting 
> TCP backpressure on connections that are publishing too fast. They are:
>    - A per-connection mechanism that prevents messages being published 
>    faster than they can be routed to queues.
>    - A global mechanism that prevents any messages from being published 
>    when the memory usage <https://www.rabbitmq.com/memory-use.html> exceeds 
>    a configured threshold or free disk space drops below a configured 
>    threshold.
> Both mechanisms will temporarily *block* connections - the server will 
> pause reading from the sockets of connected clients which send 
> content-bearing methods (such as basic.publish) which have been blocked. 
> Connection heartbeat monitoring will be disabled too.

on the bottom of that article, there's a link to this other article<https://www.rabbitmq.com/connection-blocked.html>, 
which shows a way to handle blocked connections in both Java and .NET (I'm 
using .NET API)  through events.

What is the best way to handle this situation in the client? Do I have to 
implement those event handlers and prevent any future calls to 
IModel.BasicPublish() when the connection is blocked?

RabbitMQ Version: 3.1.0
Client .NET Version:
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