The Apache Helix team would like to announce the release of Apache Helix 1.3.1.

This is the tweenty nighth release under the Apache umbrella, and the tweenty fifth 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

Helix Cloud Support

  • Support better auto registration logic
  • Can smoothly evacuate the node partitions with n -> n + 1 -> n strategy to other nodes.

Detailed Changes

Bug Fixes

  • Fix the 'BadVersion' exception handling in doSet() code path. (#2614)
  • Changed Log level to DEBUG for the top-state metrics logs, to avoid logging for every partition.(#2611)
  • Fix inconsistent map key formatting in helix-rest maintenance API (#2583)
  • WAGED - bugs fixes in n - n + 1 (#2578)


  • Implement the on-demand rebalance service (#2595)
  • Metaclient leader election -(#2558, #2560, #2562)
  • MetaClient Distributed Semaphore API and Permit object (#2520)
  • ZkClient - only register one time watcher for read data when not using persist listener. (#2555)
  • Add InstanceConfigs inputField to allow overriding the existing InstanceConfigs for /partitionAssignment API.(#2586)

Cheers, -- The Apache Helix Team

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