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HiveMQ Release

HiveMQ 4.9.1 Maintenance Release

by HiveMQ TeamNOV 8, 2022

The HiveMQ team is pleased to announce the availability of HiveMQ 4.9.1.

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

HiveMQ Server

  • Reduced memory usage during the trace recording of MQTT packets.
  • Fixed an issue that could prevent successful HiveMQ shutdown when the diagnostic mode is enabled.
  • Improved the priority handling of HiveMQ extensions that use the same extension services to avoid possible conflicts.
  • Fixed an issue where messages got enqueued and not delivered to connected clients after a node joined the cluster.
  • Fixed an issue that could cause the HiveMQ broker to log duplicate extension starts during startup on some Windows desktop installations.
  • Adjusted the naming of extension executors to facilitate accurate debugging.
  • Fixed an issue in which overload protection could unnecessarily prevent a client from publishing.
  • Fixed an issue where messages got enqueued and not delivered to connected clients after a node left the cluster.
  • Improved clean-up handling when overload protection back-pressure ends for better memory usage.
  • Added metric com.hivemq.shared-subscriptions.overall.current that tracks the current number of shared subscriptions on the HiveMQ broker.

HiveMQ Enterprise Bridge Extension

  • Improved the clarity of HiveMQ Enterprise Bridge Extension loss of connection log entries.

HiveMQ Enterprise Distributed Tracing Extension

  • Updated span attribute names in the HiveMQ Distributed Tracing Extension to support new OpenTelemetry semantic conventions.

HiveMQ Enterprise Extension for Google Cloud Pub/Sub

  • Resolved an issue in the HiveMQ Enterprise Extension for Google Cloud Pub/Sub that could cause the extension to consume more memory than necessary.

MQTT CLI

  • Adjusted the MQTT CLI tool to ensure correct handling of the no clean start option in PUBLISH and CONNECT operations.
  • MQTT CLI now prints no malformed output on unsupported platforms for ANSI colorings.
  • Added the -m:empty to the publish command of the MQTT CLI to specify an empty payload.
  • The debian package of the MQTT CLI now supports headless java runtimes.
  • Fixed an issue in the MQTT CLI tool to ensure that user properties are correctly included in UNSUBSCRIBE operations.
  • Adjusted the MQTT CLI tool to ensure correct handling of the request problem information option in PUBLISH and CONNECT operations.

Have a great day, The HiveMQ Team