public boolean isBalancerOn() {
    return !isInMaintenanceMode() && loadBalancerStateStore != null && loadBalancerStateStore.get();
  }
Queries the state of the {@link LoadBalancerStateStore}. If the balancer is not initialized,
false is returned.
@return The state of the load balancer, or false if the load balancer isn't defined.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java