private void tableMetricRegisterAndMark(Row op) {
      // Mark table metric
      String tableName = getTableNameFromOp(op);
      if (tableName == null || tableName.isEmpty()) {
        return;
      }
      String tableRequestMeter = tableMeterName(tableName);
      registerAndMarkMeter(tableRequestMeter);
    }
Get regionId from Ops such as: get, put, delete.
@param op such as get, put or delete.
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java