Add WAGED rebalancer reset method to clean up cached status. (#696)

The reset method is for cleaning up any in-memory records within the WAGED rebalancer so we don't need to recreate one.

Detailed change list:
1. Add reset methods to all the stateful objects that are used in the WAGED rebalancer.
2. Refine some of the potential race condition in the WAGED rebalancer components.
3. Adjust the tests accordingly. Also adding new tests to cover the components reset / the WAGED rebalancer reset logic.
13 files changed
tree: 87b6322eb3cfbfa7949cf96ce78dfafc7cbf9530
  1. helix-admin-webapp/
  2. helix-agent/
  3. helix-core/
  4. helix-front/
  5. helix-rest/
  6. recipes/
  7. scripts/
  8. website/
  9. .gitignore
  10. build
  11. bump-up.command
  12. deploySite.sh
  13. helix-style-intellij.xml
  14. helix-style.xml
  15. hpost-review.sh
  16. LICENSE
  17. NOTICE
  18. pom.xml
  19. README.md
README.md

Apache Helix

Helix is part of the Apache Software Foundation.

Project page: http://helix.apache.org/

Mailing list: http://helix.apache.org/mail-lists.html

Build

mvn clean install package -DskipTests

WHAT IS HELIX

Helix is a generic cluster management framework used for automatic management of partitioned, replicated and distributed resources hosted on a cluster of nodes. Helix provides the following features:

  1. Automatic assignment of resource/partition to nodes
  2. Node failure detection and recovery
  3. Dynamic addition of Resources
  4. Dynamic addition of nodes to the cluster
  5. Pluggable distributed state machine to manage the state of a resource via state transitions
  6. Automatic load balancing and throttling of transitions