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Acunu Cassandra London Meetup

Richard Low of Acunu presented some performance results demonstrating how marvelous Acunu's distribution of Cassandra is compared to the vanilla version. There's a related blog post with updated range query results here: http://www.acunu.com/2011/03/cassandra-under-heavy-write-load-part-ii/

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Acunu Cassandra London Meetup

  1. 1. Cassandra performance testing Richard Low Software Engineer richard@acunu.comCassandra London Meetup, 21 Mar 2011
  2. 2. MenuBig DataCassandra testingQ &A
  3. 3. Big Data?Scale, Performance, Low Cost: Need all 3 :-|
  4. 4. RDBMS ext3,... LVM RAIDhardware
  5. 5. RDBMS ext3,... LVM RAIDhardware
  6. 6. Big Data ext3,... LVM RAIDhardware
  7. 7. Big Data ext3,... LVM RAIDnew HW!
  8. 8. Big Datanew HW!
  9. 9. Cassandra (vanilla) Cassandra (Acunu)
  10. 10. Cassandra (vanilla) Cassandra (Acunu) + performance
  11. 11. Cassandra (vanilla) Cassandra (Acunu) + performance + snapshots + clones
  12. 12. Cassandra (vanilla) Cassandra (Acunu) + performance + snapshots + clones + monitoring
  13. 13. Performance testing
  14. 14. Inserts• Single box, 24 GB RAM, 7 disks• 3 billion rows• 50 byte values• 8 byte keys• 1 column per row• Batch insert 100 at once
  15. 15. Random Inserts - Vanilla Cassandra
  16. 16. Insert summary Vanilla Cassandra Acunu Cassandra Insert time / hrs 26 18 Max 95thpercentile latency / 37 0.3 s
  17. 17. If you only care about writeperformance, /dev/null is great (and web-scale)
  18. 18. Range queries• High insert rate no use if reads are slow• High insert rate can impact range query performance• Test: insert 100 million rows, with same properties as before• After inserts, immediately perform small range queries (get_range_slices with random start key)
  19. 19. Summary...• Strong foundations for Big Data with order of magnitude performance improvement• v1: Back Cassandra (+others) and tools without modification• Fast, robust, simple platform• Makes test/dev cycle more effective
  20. 20. Thanks :)www.acunu.com/blog
  21. 21. Thanks :)www.acunu.com/blog

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