The Apache Helix team would like to announce the release of Apache Helix 0.9.1.

This is the eighteenth release under the Apache umbrella, and the eleventh 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

Critical bugs fixed.

In this release, we fixed several critical bugs that may cause the Helix controller to misbehave.

Detailed Changes

Bug Fixes

  • [HELIX-331] Fix the possible race condition while Helix refreshes cluster status cache that may block resource rebalance.
  • [HELIX-395] Fix the CallbackHandler registration logic in DistributedLeaderElection which may cause an idle leader controller.
  • TASK: Fix the behavior that Helix shall drop all tasks whose requested states are DROPPED.


  • Support stateModelDef modification in Helix REST 2.0.

Cheers, -- The Apache Helix Team

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