a quick talk i gave at the meetup in boulder, colorado

2. Cassandra – been actively using for 2+ years

3. Hadoop – 1 yr experience, sort of

5. Options: mongodb, redis, cassandra, couch, hbase, riak, voldermort, dynamodb

6. We're gonna get billions of responses – RDBMS is going to fall over

7. We need nosql... what the hell is that??

8. Problem For Today, cont. Kevin, response=cassandra, kevin@foo.com Emma, response=redis, emma@foo.com Asher, response=cassandra, [email_address] … … … BILLIONS AND BILLIONS OF THESE!!!!

10. Key Value store

11. Ring architecture w/ replication 2^217 tokens Node 1 Node 2 Node 4 Node 3

13. Column Families – std, dynamic (mo better) name preference 100 kevin cawley cassandra 101 asher cawley cassandra 102 emma cawley redis 202 201 redis ['joe','bob'] ['matthias'] cassandra ['kevin', 'asher'] ['tom'] mongodb ['holly'] ['dan'] assume User keys as utf8;

15. Fanning – not the cool refreshing kind

16. Getting phased out 202 201 redis {'joe' => 'joe@foo.com , 'bob' => 'bob@boo.com'} {'matthias' => 'matthias@foo.cm', 'tom' => 'tom@boo.com'}

20. We built our own – now free

21. Cassandra is eventually consistent makes this hard

22. Be clever and you will win

23. Demo 2

24. Counters Counter cassandra 30333 redis 22098 mongodb 24567 couch 12340 ...

28. Map - processes a key/value pair to generate a set of intermediate key/value pairs

29. Reduce - function that merges all intermediate values associated with the same intermediate key

31. cassandra asher

33. Redis 1 AND the winner is cassandra w/ 2 votes!!!

38. Dangerous if you don't know what you are doing

39. Schemaless – ironically modelling is extermely imp.