HiveMQ 4.28.18 Maintenance Release

The HiveMQ team is pleased to announce the availability of HiveMQ 4.28.18.

This maintenance release for the 4.28 series includes the following improvements:

HiveMQ Enterprise MQTT Broker

• Improved the scalability of messages sent to the same topic or topics with common prefixes, including subscriptions that use wildcards in their topic filters.
• Added support for storing portions of the subscription index on disk to reduce memory usage when matching PUBLISH messages to subscribers.
• Reduced the memory consumption per subscription.
• Added a log file exporter that automatically includes relevant hivemq.log, event.log, and migration.log files in diagnostic archives.

HiveMQ Data Hub

• Fixed an issue where large unsigned integers were not correctly parsed between Protobuf and JSON.

IMPORTANT: Starting with the next LTS version, Java 21 will be required to run the HiveMQ Platform.

We also recommend using Java 21 to run the current LTS line of the HiveMQ Platform.

If you use the official HiveMQ container images, no action is required – these images have shipped with Java 21 since HiveMQ 4.28.

Have a great day, The HiveMQ Team