private boolean isMetaTableIsolated(BalancerClusterState cluster) {
    return isTableIsolated(cluster, TableName.META_TABLE_NAME, "Meta");
  }
Validates whether all meta table regions are isolated.
hbase-balancer/src/test/java/org/apache/hadoop/hbase/master/balancer/TestLargeClusterBalancingTableIsolationAndReplicaDistribution.java