Luigi Presentation at OSCON 2013
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Simple software is hard...don't give up!
- 1. SimpleSoftwareisHard TalesfromtheTrenches BertrandDelacrétaz @bdelacretaz, grep.codeconsult.ch PrincipalScientist,CQ/AEMR&Dgroup,AdobeBasel ApacheSoftwareFoundationMemberandDirector November2014 slidesrevision2014-11-14
- 2. lookingforanswers? wrongplace! I’mmoreaboutquestionstoday…
- 3. picture: dhester on morguefile.com couldwe invent this today?
- 4. beautifulsimplicity assimpleaspossible,butnotsimpler (tobeprecise,it’saVictorinoxskipperknife)
- 5. a storyof simplicity (twostories,actually)
- 6. s = UDP socket While(s is open) { Wait for packet Packet matches our filter? If not -> continue If yes: Compute storage path from T Append packet to storage file } 26linesofcode 3monthsof work (happilychuggingalongsince1999)
- 7. recorddigital audio continuously cannotlosemore than15seconds (remember-1999)
- 8. options? BigCo#1 BigCo#2 picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com
- 9. picture:RoganJoshonmorguefile.com N-dimensional picture:pschubertonmorguefile.com
- 10. picture:RoganJoshonmorguefile.com picture:andykonmorguefile.com 5127prototypes
- 11. overnight?no-8WIREDApril2011
- 12. picture:RoganJoshonmorguefile.com N-dimensional picture:pschubertonmorguefile.com
- 13. that’syouroptions… BigCo#1 BigCo#2 picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com
- 14. simpler? picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com
- 15. yes! picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com RTP packet recorder
- 16. 26linesofcode 3months picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com RTP packet recorder s = UDP socket While(s is open) { Wait for packet Packet matches our filter? If not -> continue If yes: Compute storage path from T Append packet to storage file }
- 17. ifit’snotsimpleenoughyet donotgive up
- 18. picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com RTP packet recorder storage?
- 19. RTP packet recorder storage? continuousstorage seekbytimestamp variablespeedreplay 100%robust
- 20. enterpriseDB! picture:jusbenonmorguefile.com
- 21. picture:RoganJoshonmorguefile.com picture:pschubertonmorguefile.com N-dimensional
- 22. RTP packet recorder 2014/06/25/1402.rtp chronologicalhierarchyof timestamp-addressedfiles stores15secondsofRTPpackets unbreakable storage!
- 23. picture:RoganJoshonmorguefile.com picture:MrMagiconmorguefile.com RTP packet recorder storage 2014/06/25/1402.rtp continuousrecording continuousstorage seekbytimestamp variablespeedreplay s = UDP socket While(s is open) { Wait for packet Packet matches our filter? If not -> continue If yes: Compute storage path from T Append packet to storage file }
- 24. beautifulsimplicity assimpleaspossible,butnotsimpler
- 25. Apowerfulmetaphor cat sortgrep awk stdout stderr pipelinemetaphor simplemodules simpleassemblymodel transparent,robust,powerful
- 26. Asimpleuniverse “TherearejustthreeabstractionsinApacheStorm: spouts,bolts,andtopologies.” PicturefromApacheStorm:distributedstreamprocessing
- 27. Asimplemodel picturefromhttp://de.wikipedia.org/wiki/MapReduce
- 28. SlingHealthChecks
- 29. donotreinvent themetaphor!whatdoesmyproblemlooklike?
- 30. ok,but high-end CMS?
- 31. HTTPrequest C C C C C CC C C processor dispatcher it’s justa Web server…
- 32. HTTP0.9 (startsimple) GET/hello.txt <html>hello!</html> client server
- 33. HTTPrequests C C C C C CC C C dispatcher evenifit getsbusy… processor processor processor processor processor processor processor processor processor
- 34. inspiredbynature… multipleworkerswith specificroles picture:kakiskyonmorguefile.com
- 35. so, how?
- 36. putthebar high donotacceptextracomplexity
- 37. investinsimplicity canbeexpensive…andworthit
- 38. chasetheright metapho r “anetworkpacketsrecorderandplayer”
- 39. simplicityisa process youusuallyknowwhenyou’rethere
- 40. beautifulsimplicity assimpleaspossible,butnotsimpler
- 41. whatarethe enablers?
- 42. modularitenablers
- 43. open developmenenablers
- 44. JCR’sbigtreewithlowcoupling promotes“local”simplictyenablers
- 45. ApacheSlingenablers
- 46. notsimpleenough? don’tgiveup! BTW...wearehiring!
