Release Notes for Apache Helix 1.2.0
The Apache Helix team would like to announce the release of Apache Helix 1.2.0.
This is the tweenty seventh release under the Apache umbrella, and the tweenty third as a top-level project.
Helix is a generic cluster management framework used for the automatic management of partitioned, replicated and distributed resources hosted on a cluster of nodes.
In this release, Helix provides several performance improvements for rebalance pipeline:
Key Note for Helix Release
JDK bump up to Java 11
JDK bumpped from Java 8 to Java 11 for better performance.
Waged Pipeline Redesign (#2319)
Introduces Emergency Rebalance and other performance optimization to fast handle node down.
Detailed Changes
Improvements
- Improve AssignmentMetadataStore with double-checked locking (#2289)
- Reducing zk operations default retry timeout. (#2293)
- Enable MSDS auto refresh for DedicatedZkClient (#2357)
- Adding a new metric to report number of partitions with missing top state beyond threshold (#2381)
- Refactor updating and searching for threadpool for state transition messages (#2380)
- Add API for users to provide customized threadpool for different categories of state transition messages(#2390)
- Helix-REST - Add support for auto-generated API documentation (#2396)