The Apache Helix team would like to announce the release of Apache Helix 1.0.3.

This is the tweenty third release under the Apache umbrella, and the nighteenth 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

Replica Level Throttling

Helix redesign the throttling from partition level to fine-grained replica level throttling, which fixes problem for certain type of state transition control on throttling.

Native Cloud Support

Helix add additional features for users on native cloud support.

  • Virtual topology group: if the logical zone/rack numbers on cloud are less than number of resource replications, Helix cannot do assignment. In this case, Helix provides best effort to help divide small number of zones/racks into larger number of virtual zones with minimizing availability impact.
  • Cloud event handling: Helix supports urgent cloud event handling, such as live migraiton, container freeze and so on. Defaultly, Helix will disable/enable that instances when onpause/onresume are called.

Detailed Changes

Bug Fixes

  • Upgrade Log4j to 2.17.1 to address CVE-2021-44228 (#1922)
  • fix Broken Logic in perPartitionHealthCheck (#2012)
  • Fixes #1802 - messages intended for instances that are no longer in the cluster (#1951)
  • Fix Issue#1941 - Incorrect condition caused not to log error message
  • Fix adding a task to a job after deleting old tasks (#1875)
  • Fix inconsistent behavior beween batch stoppable and single stoppable API (#1879)
  • Fix MaintenanceRecoveryStage Hanging (#1792)
  • Fix for - Stale message redundant logs
  • Fix a string operation for custom health check and update test (#1924)


  • Populate helix cloud property using cloud config (#2005)
  • Add response metadata to response header for partitionAssignment (#1797)
  • New REST api partitionAssignment -- return potential assignment given cluster change (#1747)
  • Enforce id field in Helix rest to update resource config (#1672)
  • Gracefully handle interruptions in the Helix logic. (#1779)
  • Get rid of non-official ZK error code to avoid NPEs. (#1778)
  • Add a Waged rebalancer util api that do not need raw zk address (#1756)

Cheers, -- The Apache Helix Team

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