what are the maximum mqtt connections supported by activemq 5.10.0

2
votes

I want to support around 100K mqtt connections using activemq. The activemq server is rejecting connections beyond 30K. How to tune activemq to support more number of connections. I have tried the following

transportConnector name="mqtt" allowLinkStealing="true" uri="mqtt+nio://0.0.0.0:1883?maximumConnections=100000&wireFormat.maxFrameSize=104857600&transport.defaultKeepAlive=60000&transport.closeAsync=false&useQueueForAccept=false

in activemq.xml but of no use. I did some unix kernel tuning for number of open file fds to 100000. Any one solved this problem ?

3
activemqscalingmqttconnectiontransport

3 Answers

5
votes

If you are going to handle > 100k connections I'd recommend looking into a dedicated MQTT broker instead of a multi-protocol message broker. You can see a list of MQTT brokers at the MQTT Github wiki.

ActiveMQ is afaik not designed for handling that much MQTT connections and is not optimized for MQTT because it's a multi-purpose Message Queue. If you want to stick with Apache software, perhaps using Apache Apollo can help although I don't know of any MQTT Apollo deployments with that size, but probably wort a try if you need a multi-protocol broker. Again, I'd recommend a dedicated MQTT broker for large amounts of MQTT connections.

You should definitely look into reactive and multi-threaded MQTT brokers if you want to handle that amount of connections and you should make sure that the MQTT broker you choose is known to work with your desired connection amount and load. HiveMQ for example is capable of handling >100k connections.

Full disclosure: I work for the company behind HiveMQ.

1
votes

May I suggest you use Apache Apollo for MQTT connections when you have that number of concurrent sessions?

Apache Apollo is a sub project of ActiveMQ with the intent to make the broker scalable to a large number of connected clients. While ActiveMQ supports MQTT, it's not really optimized for this scenario.

0
votes

JoramMQ (http://jorammq.com) is based on the Joram (http://joram.ow2.org) multi-protocol message broker and it supports more than 500K concurrent MQTT connections.