The Apache Helix team would like to announce the release of Apache Helix 1.3.0.

This is the tweenty eighth release under the Apache umbrella, and the tweenty fourth 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

Generic Meta Client Support

  • MetaClient is a generic metadata client provides an abstraction layer for metadata access. It is designed for current Helix, Helix micro service users and potentially all ZooKeeper or other metadata service users.
  • MetaClient has a generic metadata client interface for data access and notification, and 3 additional clients for membership management, lock, and leader election. It has ZooKeeper implementation is first version and can we plan to introduce more flavor in the future.

Waged Rebalancer Improvement

  • WAGED - Fix the intermediate hard-constraint violation during n=n+1 state. (#2546)
  • Support capcacity aware when doing n -> n + 1 check. (#2493)

Detailed Changes

Bug Fixes

  • Fix for parallel instances stoppable API incorrectly reordering the zoneList when a user provides their own zone_order.(#2566)
  • Fix the broken build (#2570)
  • Small bug fixes related to ZK disconnect. (#2486)


  • Add support for pluggable external CloudInfoProcessor and CustomizedCloudProperties (#2497)
  • MissingTopState when the leader comes back on the same host (#2514)
  • Update HttpClient version across all 3 components of Helix.(#2508)

Cheers, -- The Apache Helix Team

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