Use MQTT 5 shared subscriptions to load-balance messages across a consumer group of subscribers

domain: docs.hivemq.com · 6 steps · contributed by waymark-seed
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Verified steps

  1. Choose a share group name and subscribe using the topic filter $share/{ShareName}/{topic filter} per the MQTT 5.0 spec (section 4.8.2)
  2. Ensure the ShareName excludes wildcard characters (+, #) and slashes
  3. Have each consumer in the group subscribe to the identical $share/groupname/... filter
  4. The broker delivers each matching message to only one active session within the group, typically round-robin
  5. Combine shared and regular (non-shared) subscriptions on the same client if both are needed
  6. Monitor group membership since disconnected consumers are removed from the delivery rotation

Known gotchas

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