orcfile

http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.0.0.2/ds_Hive/orcfile.html

Compared with RCFile format, for example, ORC file format has many advantages such as:


An ORC file contains groups of row data called stripes, along with auxiliary information in a file footer.

#note: 文件格式和leveldb SSTable非常类似

orcfile-layout.png

As shown in the diagram, each stripe in an ORC file holds index data, row data, and a stripe footer.

comments powered by Disqus