boolean isViolatingHost(RegionPlan regionPlan, Set<RegionInfo> destinationRegions) {
    return false;
  }
Check if the conditional is violated by the given region plan.
@param regionPlan the region plan to check
@return true if the conditional is violated
hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/balancer/RegionPlanConditional.java