Examples with SemiAutoRebalancer org.apache.helix.controller.rebalancer.SemiAutoRebalancer used on opensource projects

Example 1 with SemiAutoRebalancer

use of org.apache.helix.controller.rebalancer.SemiAutoRebalancer in project helix by apache.

the class BestPossibleStateCalcStage method getRebalancer.

private Rebalancer getRebalancer(IdealState idealState, String resourceName, boolean isMaintenanceModeEnabled) {
    Rebalancer customizedRebalancer = null;
    String rebalancerClassName = idealState.getRebalancerClassName();
    if (rebalancerClassName != null) {
        logger.debug("resource " + resourceName + " use idealStateRebalancer " + rebalancerClassName);
        try {
            customizedRebalancer = Rebalancer.class.cast(HelixUtil.loadClass(getClass(), rebalancerClassName).newInstance());
        } catch (Exception e) {
            logger.error("Exception while invoking custom rebalancer class:" + rebalancerClassName, e);
        }
    }
    Rebalancer rebalancer = null;
    switch(idealState.getRebalanceMode()) {
        case FULL_AUTO:
            if (isMaintenanceModeEnabled) {
                rebalancer = new MaintenanceRebalancer();
            } else {
                if (customizedRebalancer != null) {
                    rebalancer = customizedRebalancer;
                } else {
                    rebalancer = new AutoRebalancer();
                }
            }
            break;
        case SEMI_AUTO:
            rebalancer = new SemiAutoRebalancer();
            break;
        case CUSTOMIZED:
            rebalancer = new CustomRebalancer();
            break;
        case USER_DEFINED:
        case TASK:
            rebalancer = customizedRebalancer;
            break;
        default:
            logger.error("Fail to find the rebalancer, invalid rebalance mode " + idealState.getRebalanceMode());
            break;
    }
    return rebalancer;
}