Examples of org.apache.helix.controller.rebalancer.AutoRebalancer

org.apache.helix.controller.rebalancer.AutoRebalancer

This is a Rebalancer specific to full automatic mode. It is tasked with computing the ideal state of a resource, fully adapting to the addition or removal of instances. This includes computation of a new preference list and a partition to instance and state mapping based on the computed instance preferences. The input is the current assignment of partitions to instances, as well as existing instance preferences, if any. The output is a preference list and a mapping based on that preference list, i.e. partition p has a replica on node k with state s.

          logger.warn("Exception while invoking custom rebalancer class:" + rebalancerClassName, e);
        }
      }
      if (rebalancer == null) {
        if (idealState.getRebalanceMode() == RebalanceMode.FULL_AUTO) {
          rebalancer = new AutoRebalancer();
          mappingCalculator = new AutoRebalancer();
        } else if (idealState.getRebalanceMode() == RebalanceMode.SEMI_AUTO) {
          rebalancer = new SemiAutoRebalancer();
          mappingCalculator = new SemiAutoRebalancer();
        } else {
          rebalancer = new CustomRebalancer();


      Rebalancer rebalancer = null;
      MappingCalculator mappingCalculator = null;
      switch (idealState.getRebalanceMode()) {
      case FULL_AUTO:
        AutoRebalancer autoRebalancer = new AutoRebalancer();
        rebalancer = autoRebalancer;
        mappingCalculator = autoRebalancer;
        break;
      case SEMI_AUTO:
        SemiAutoRebalancer semiAutoRebalancer = new SemiAutoRebalancer();

Related Classes of org.apache.helix.controller.rebalancer.AutoRebalancer

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