HiveMQ 4.0.2 Maintenance Release

Written by HiveMQ Team

Published: February 4, 2019

The HiveMQ team is pleased to announce the availability of HiveMQ 4.0.2. This is a maintenance release for the 4.0 series and brings the following improvements:

Improved overall messaging performance.
Improved connect performance.
Improved HiveMQ start up in environments without default language.
Improved logging for extension reload.
Improved validation of extension system output objects and builders.
Fixed an issue that could prevent a node to join an existing cluster.
Added log statements indicating the state of ongoing data redistribution when a node leaves the cluster.
Fixed an issue where HiveMQ start up could be blocked by a broken extension.
Improved handling for queued messages when in-flight queue is already full.
Added metrics for pending messages.
Control Center now shows queued Qos 1 and 2 publish messages for each client.
Fixed an issue with the subscription and retained message metric that could result in incorrect values.
Fixed an issue where the duplicate delivery flag was set incorrectly.
Added warning for possibly incorrect configuration of static cluster discovery.
Improved client take over handling on cluster merge.
HiveMQ now ignores non-extension folders in the extension directory.
Fixed an issue that could lead to clients being listed twice in the Control Center client table.
Fixed an issue where messages would only be delivered once, if a client simultaneously had identical shared and regular subscriptions.
Fixed an issue where a QoS 2 publish message can expire, if the message was already sent but not acknowledged.
Updated log messages when client was disconnected via Control Center.
MQTT 5 clients now receive a DISCONNECT packet when exceeding maximum packet size.
MQTT 5 clients now receive a DISCONNECT packet when disconnected via extension system or Control Center.
Improved HiveMQ startup time on Windows.