# Advanced

EMQ 2.0 release supports Local Subscription and Shared Subscription .

# Local Subscription

The EMQ broker will not create global routes for Local Subscription , and only dispatch MQTT messages on local node.

mosquitto_sub -t '$local/topic'

mosquitto_pub -t 'topic'

Usage: subscribe a topic with $local/ prefix.

# Shared Subscription

Shared Subscription supports Load balancing to distribute MQTT messages between multiple subscribers in the same group:

                            ---------
                            |       | --Msg1--> Subscriber1
Publisher--Msg1,Msg2,Msg3-->|  EMQ  | --Msg2--> Subscriber2
                            |       | --Msg3--> Subscriber3
                            ---------

Two ways to create a shared subscription:

PrefixExamples
$queue/mosquitto_sub -t '$queue/topic'
$share/<group>/mosquitto_sub -t '$share/group/topic'