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RCFile (columnar storage on Hive) Yongqiang He 12/09/09
Agenda
Why Columnar Storages Better Compression Light weight compression RLE Bit-map Etc CPU, Memory, Storage Columnar Operator  Cache conscious (MonetDB)
Columnar Storages Traditional Columnar Store C-Store/Vertica MonetDB Etc Columnar Store on Hadoop/Cloud Zebra (Y!’s effort in Pig) RCFile (Hive)
Category Pure Columnar MonetDB (in-memory, very fast) Columnar Group (Projection) C-Store/Vertica (FlexStore?) Zebra (Y!’s effort in Pig) Row Columnar (PAX) RCFile (Hive)
Row Construction Why needed? Columns data is stored separately, and may sorted in different order. Need Join MonetDB (in-memory, very fast) BAT C-Store/Vertica (use more projections to avoid, ?) Not need join (Join in Cloud is EXPENSIVE) Zebra (Y!’s effort in Pig) RCFile (Hive)
Data Sort Property Can data be sorted in anyway after loaded? No.  Yes. Good for row construction Operating on sorted data.  But need complex row construction.
RCFile Storage Layout 4 5 4 MetaData 4 4 4 4 4 Compressed                   ……. 2 0 3 4 Built-in RLE ‘ABCD’, 1234, ‘haha’ ‘DEFG’, 3456, ‘ha’ Column compressed ‘ABCD’ ‘DEFG’ ‘Hadoop’ ‘Hadoop’, 01, ‘’ ‘Hive’ 1234 01 3456 01 Lazy decompress ‘Hive’, 01, ‘waa’ ‘haha’ ‘ha’ ‘waa’                   ……. All data, no meta data Work with Column Pruning ,[object Object]
Lazy decompress,[object Object]
Facebook Data Team Presentation(2009 12 11) V0.2

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Facebook Data Team Presentation(2009 12 11) V0.2

  • 1.
  • 2. RCFile (columnar storage on Hive) Yongqiang He 12/09/09
  • 4. Why Columnar Storages Better Compression Light weight compression RLE Bit-map Etc CPU, Memory, Storage Columnar Operator Cache conscious (MonetDB)
  • 5. Columnar Storages Traditional Columnar Store C-Store/Vertica MonetDB Etc Columnar Store on Hadoop/Cloud Zebra (Y!’s effort in Pig) RCFile (Hive)
  • 6. Category Pure Columnar MonetDB (in-memory, very fast) Columnar Group (Projection) C-Store/Vertica (FlexStore?) Zebra (Y!’s effort in Pig) Row Columnar (PAX) RCFile (Hive)
  • 7. Row Construction Why needed? Columns data is stored separately, and may sorted in different order. Need Join MonetDB (in-memory, very fast) BAT C-Store/Vertica (use more projections to avoid, ?) Not need join (Join in Cloud is EXPENSIVE) Zebra (Y!’s effort in Pig) RCFile (Hive)
  • 8. Data Sort Property Can data be sorted in anyway after loaded? No. Yes. Good for row construction Operating on sorted data. But need complex row construction.
  • 9.
  • 10.