EMQ X 4.4 can be in-place upgraded from 4.3 with a node restart.
EMQ X 4.3 nodes and 4.4 nodes can work together in the same cluster
so there is no need for a full cluster re-installation to upgrade.
4.4-alpha.1 is based on EMQ X 4.3.10, included changes are:
Features
Performance
- Cluster RPC library gen_rpc upgrade, with more performant default config (connection pool), and it now supports TLS
- Top K slowest topics query to find out which topics are the slowest to deliver
- exhook now supports a pool of gRPC clients
Management
- Display number of collected clients (not including the clients having a persisted session)
- Manage per-client or per-topic tracing from dashboard
- Cluster discovery supports k8s srv DNS records
- Dashboard supports relative paths or custom access paths
Data Integration
- Support mongodb srv endpoints
- Allow single quotes in rule engine SQL expressions
- exhook now passes MQTT message headers in gRPC calls
Packaging
The package name will include Erlang/OTP version, and the name scheme is slightly different comparing to 4.3
Take zip package for example:
old: emqx-ubuntu20.04-4.3.9-amd64.zip
new: emqx-4.4-alpha.1-otp23.3.4.9-2-ubuntu20.04-amd64.zip