private String tableMeterName(String tableName) {
      // Extract meter name containing the table name
      return String.format("MetaTable_table_%s_request", tableName);
    }
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