@Override
        public Long call() throws Exception {
          try {
            LOG.debug("Partition path : " + path);
            FileSystem fs = path.getFileSystem(conf);
            return fs.getContentSummary(path).getLength();
          } catch (IOException e) {
            return 0L;
          }
        }
Find the bytes on disks occupied by list of partitions
@param conf
         - hive conf
@param parts
         - partition list
@return sizes of partitions
ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java