public static Map<TableName, QuotaState> fetchTableQuotas(final Connection connection,
    final List<Get> gets, Map<TableName, Double> tableMachineFactors) throws IOException {
    return fetchGlobalQuotas("table", connection, gets, new KeyFromRow<TableName>() {
      @Override
      public TableName getKeyFromRow(final byte[] row) {
        assert isTableRowKey(row);
        return getTableFromRowKey(row);
      }

      @Override
      public double getFactor(TableName tableName) {
        return tableMachineFactors.containsKey(tableName) ? tableMachineFactors.get(tableName) : 1;
      }
    });
  }
Returns true if the support for quota is enabled
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/QuotaUtil.java