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


  • 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)

Cheers, -- The Apache Helix Team

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