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ORC FilesOwen O’Malleyowen@hortonworks.comDecember 2012© Hortonworks Inc. 2012 Page 1

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Top Level Page 2 © Hortonworks Inc. 2012

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File Structure Page 3 © Hortonworks Inc. 2012

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Stripe Structure Page 4 © Hortonworks Inc. 2012

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File Layout Page 5 © Hortonworks Inc. 2012

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Integer Column Serialization Page 6 © Hortonworks Inc. 2012

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String Column Serialization Page 7 © Hortonworks Inc. 2012

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Compression Page 8 © Hortonworks Inc. 2012

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Projection and Predicate Filtering Page 9 © Hortonworks Inc. 2012

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Example File Sizes Page 10 © Hortonworks Inc. 2012

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Final notes Page 11 © Hortonworks Inc. 2012

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Comparison RC File Trevni ORC File Hive Type Model N N Y Separate complex columns N Y Y Splits found quickly N Y Y Default column group size 4MB 64MB* 250MB Files per a bucket 1 >1 1 Store min, max, sum, count N N Y Versioned metadata N Y Y Run length data encoding N N Y Store strings in dictionary N N Y Store row count N Y Y Skip compressed blocks N N Y Store internal indexes N N Y Page 12 © Hortonworks Inc. 2012