The Apache Helix team would like to announce the release of Apache Helix 0.6.5.

This is the eighth release under the Apache umbrella, and the 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. Helix provides the following features:

  • Automatic assignment of resource/partition to nodes
  • Node failure detection and recovery
  • Dynamic addition of Resources
  • Dynamic addition of nodes to the cluster
  • Pluggable distributed state machine to manage the state of a resource via state transitions
  • Automatic load balancing and throttling of transitions

Changes

Bug

  • [HELIX-512] - add back HelixManager#getHealthReportCollector() interface to 0.6.x
  • [HELIX-514] - ZkBaseDataAccessor#set() should throw BadVersionException instead of return false in case of version mismatch
  • [HELIX-518] - Add integration tests to ensure helix tasks work as expected during master failover
  • [HELIX-519] - Add integration tests to ensure that "kill-switch" for Helix tasks work as expected
  • [HELIX-521] - Should not start GenericHelixController#ClusterEventProcessor in types other than CONTROLLER and CONTROLLER_PARTICIPANT
  • [HELIX-537] - org.apache.helix.task.TaskStateModel should have a shutdown method.
  • [HELIX-541] - Possible "livelock" in Helix controller
  • [HELIX-547] - AutoRebalancer may not converge in some rare situation
  • [HELIX-549] - Discarding Throwable exceptions makes threads unkillable.
  • [HELIX-550] - ZKHelixManager does not shutdown GenericHelixController threads.
  • [HELIX-552] - StateModelFactory#_stateModelMap should use both resourceName and partitionKey to map a state model
  • [HELIX-555] - ClusterStateVerifier leaks ZkClients.
  • [HELIX-559] - Helix web admin performance issues
  • [HELIX-562] - TaskRebalancer doesn't honor MaxAttemptsPerTask when FailureThreshold is larger than 0
  • [HELIX-563] - Throw more meaningful exceptions when AutoRebalanceStrategy#computePartitionAssignment inputs are invalid
  • [HELIX-572] - External view is recreated every time for bucketized resource
  • [HELIX-574] - fix bucketize resource bug in current state carryover
  • [HELIX-575] - Should not send FINALIZED callback when a bucketized resource is removed
  • [HELIX-579] - fix ivy files issue

Improvement

  • [HELIX-524] - add getProgress() to Task interface
  • [HELIX-570] - Add default state model definitions if not already exists when controller starts
  • [HELIX-573] - Add support to compress/uncompress data on ZK
  • [HELIX-576] - Make StateModelFactory change backward compatible

New Feature

  • [HELIX-546] - REST Admin APIs needed for helix job queue management
  • [HELIX-581] - Support deleting job from a job queue

Task

  • [HELIX-539] - Add ivy file for helix-agent

Test

  • [HELIX-580] - Fix test: TestBatchMessage#testSubMsgExecutionFail

Cheers, -- The Apache Helix Team

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