private String getCurOffset() {
    return generateOffset(curFileIndex, curSingleFileOffset);
  }
Generate the offset based on file index and offset within single file
@param fileIndex index of the file
@param singleFileOffset offset within single file
@return the complete offset
samza-hdfs/src/main/java/org/apache/samza/system/hdfs/reader/MultiFileHdfsReader.java