@Override
  boolean isRegionToIsolate(RegionInfo regionInfo) {
    return regionInfo.isMetaRegion();
  }
If enabled, this class will help the balancer ensure that the meta table lives on its own
RegionServer. Configure this via {@link BalancerConditionals#ISOLATE_META_TABLE_KEY}
hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/balancer/MetaTableIsolationConditional.java