HiveMQ 4.9.4 Maintenance Release

The HiveMQ team is pleased to announce the availability of HiveMQ 4.9.4.

This maintenance release for the 4.9 series includes the following improvements:

HiveMQ Enterprise MQTT Broker

• Improved performance for use cases that have a large number of subscribers for the same shared subscription group.
• Improved sustained message rates for clusters with a large number of nodes and CPU cores.
• Increased message throughput rates and payload cleanup performance in deployments with a large number of CPU cores.
• Improved handling in the cleanup service to fix an issue that could cause a periodic cleanup task to get stuck.
• Optimized caching to eliminate unnecessary Java heap memory consumption.
• Fixed an issue that could result in outdated data not being fully removed when a node joins a cluster.
• Fixed an issue that prevented the correct display of persistence executor metrics for retained message tasks and subscription tasks.
• Improved HiveMQ event log feedback for failed authentication to include custom reason strings from extensions.
• Fixed an issue that could cause the incorrect display of menu items in the HiveMQ Control Center main navigation after a license change.

HiveMQ Enterprise Extension for Kafka

• Added tracing support in the HiveMQ Enterprise Extension for Kafka for MqttToKafkaTransformer customizations that create multiple Kafka records from a single MQTT message.
• Fixed an issue where the HiveMQ Enterprise Extension for Kafka ignored the keystore private key password value in the TLS configuration to a Confluent Schema Registry. The extension now correctly uses the configured keystore private key password when establishing a connection to a Confluent Schema Registry with TLS (NOTE: Kafka extension users who currently use TLS to connect to a Confluent Schema Registry need to verify that their keystore private key password is correctly configured).

HiveMQ Swarm

• Fixed an issue that caused a slight offset in the expiry of HiveMQ Swarm licenses.
• Improved user feedback when timer commands are incorrectly configured in a HiveMQ Swarm scenario.
• Improved log output when HiveMQ Swarm starts with an invalid configuration.

MQTT CLI

• Fixed an issue that caused credential information contained in configuration properties to be ignored in broker test commands.
• Adjusted file handling in the MQTT CLI to ensure platform independence.

Have a great day, The HiveMQ Team