MongoDB for Analytics

Transcript

1. Ordered List John Nunemaker MongoChi 2011 October 18, 2011 MongoDB

   for Analytics A loving conversation with @jnunemaker

2. Background As presented through interpretive dance

3. None
4. None
5. None

6. ~1 month Of evenings and weekends

7. ~4 dog years Since public launch

8. ~6 tiny servers 2 web, 2 app, 2 db

9. ~1-2 Million Page views per day

10. None
11. None

12. Implementation Imma show you how we do what we do

    baby

13. Doing It Live No aggregate querying

14. get('/track.gif') do Hit.record(...) TrackGif end

15. class Hit def record site.atomic_update(site_updates) Resolution.record(self) Technology.record(self) Location.record(self) Referrer.record(self) Content.record(self)

    Search.record(self) Notification.record(self) View.record(self) end end

16. class Resolution def record(hit) query = {'_id' => "..."} update

    = {'$inc' => {}} update['$inc']["sx.#{hit.screenx}"] = 1 update['$inc']["bx.#{hit.browserx}"] = 1 update['$inc']["by.#{hit.browsery}"] = 1 collection(hit.created_on) .update(query, update, :upsert => true) end end end

17. Pros

18. Pros Space

19. Pros Space RAM

20. Pros Space RAM Reads

21. Pros Space RAM Reads Live

22. Cons

23. Cons Writes

24. Cons Writes Constraints

25. Cons Writes Constraints More Forethought

26. Cons Writes Constraints More Forethought No raw data

27. Time Frame Minute, hour, month, day, year, forever?

28. # of Variations One document vs many

29. Single Document Per Time Frame

30. None

31. { "t" => 336381, "u" => 158951, "2011" => {

    "02" => { "18" => { "t" => 9, "u" => 6 } } } }

32. { '$inc' => { 't' => 1, 'u' => 1,

    '2011.02.18.t' => 1, '2011.02.18.u' => 1, } }

33. Single Document For all ranges in time frame

34. None

35. { "_id" =>"...:10", "bx" => { "320" => 85, "480"

    => 318, "800" => 1938, "1024" => 5033, "1280" => 6288, "1440" => 2323, "1600" => 3817, "2000" => 137 }, "by" => { "480" => 2205, "600" => 7359,

36. "600" => 7359, "768" => 4515, "900" => 3833, "1024"

    => 2026 }, "sx" => { "320" => 191, "480" => 179, "800" => 195, "1024" => 1059, "1280" => 5861, "1440" => 3533, "1600" => 7675, "2000" => 1279 } }

37. { '$inc' => { 'sx.1440' => 1, 'bx.1280' => 1,

    'by.768' => 1, } }

38. Many Documents Search terms, content, referrers...

39. None

40. [ { "_id" => "<oid>:<hash>", "t" => "ruby class variables",

    "sid" => BSON::ObjectId('<oid>'), "v" => 352 }, { "_id" => "<oid>:<hash>", "t" => "ruby unless", "sid" => BSON::ObjectId('<oid>'), "v" => 347 }, ]

41. Writes {'_id' => "#{site_id}:#{hash}"}

42. Reads [['sid', 1], ['v', -1]]

43. Growth The best laid plans of mice and men

44. Partition Hot Data Currently using collections for time frames

45. Bigger, Faster Server More CPU, RAM, Disk Space

46. Users Sites Content Referrers Terms Engines Resolutions Locations Users Sites

    Content Referrers Terms Engines Resolutions Locations

47. Partition by Function Spread writes across a few servers

48. Users Sites Content Referrers Terms Engines Resolutions Locations

49. Partition by Server Spread writes across a ton of servers,

    way down the road, not worried yet

50. Ordered List Thank you! [email protected] John Nunemaker MongoChi 2011 October

    18, 2011 @jnunemaker