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Ce que j’aurais voulu savoir...
@parisrb 12/11/2012 & @humantalks 13/11/2012     @abelar_s




     «There are only two hard things in Computer Science:
                   cache invalidation and naming things »
                                            -- Phil Karlton
Qui suis-je ?
‣ @EPITA
‣ @FaveodFr
‣ @ParisRB
‣ ingénieur R&D pragmatique
‣ geek, créateur de jeu de société
‣ entrepreneur, associé
‣ manager, chef de projet
‣ ...
‣ ...
‣ ...
‣ ...
‣ ...
‣ développeur
Un enfer quand on ne connaît pas
5mn quand on connaît
Sans Heavy Wizardry
  Apprenez ailleurs    Casse-têtes
  ‣ regexp             ‣ horodatage
  ‣ HTTP / REST        ‣ encodages
  ‣ SCM : SVN / Git    ‣ ...
  ‣ TDD / BDD / DDD
  ‣ parsers / lexers
  ‣ compilateurs

  OS                   Théories
  ‣ mémoire            ‣ IA
  ‣ ordonnancement     ‣ probabilités
  ‣ assembleur         ‣ complexité O(?)
  ‣ optimisation       ‣ Aspect Oriented
  ‣ interruptions      ‣ systèmes typage
  ‣ sécurité           ‣ P = NP ???
State Machines
                                                   -> Pierre Couzy

  ‣ États
  ‣ Événements
  ‣ Transitions




  ‣   « Before you need it, it’s overkill;
        by the time you need it, it’s too late »

  ‣   les RegExp sont des FSM !
ETL
                                              -> @thibaut_barrere
 ‣ Extract
     ‣   CSV / XLS / SQL
 ‣ Transform
     ‣   12 -> User.find(12)
 ‣ Load
     ‣   upsert


 ‣   activewarehouse_etl ?
 ‣   datawarehouse, analytics, background jobs... o/
Outils Unix
                                                    -> @chastell
  ‣ Chercher  : grep, find, xargs
  ‣ Comparer : diff, comm
  ‣ Remplacer : sed, awk, ...
  ‣ Connecter : ssh, screen
  ‣ Lancer : crontab
  ‣ ...


  ‣   Rubyists : sort, uniq... zip et transpose ?
  ‣   Savez-vous piper les choux ?
CAP Theorem
http://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed


  ‣ Consistency                                               C
  ‣ Availability
  ‣ Partition   tolerance
                                                          A       P
                                                        Pick two?


  SQL / NoSQL == ACID / BASE ?
   /! C de CAP != C de ACID
     ‣ C CAP : tous les nodes ont la même donnée
     ‣ C ACID : toujours dans un état valide
Pour référence...

    ACID                        BASE
    ‣ Atomique                  ‣ Basic Availability
     ‣   indivisible             ‣   haute dispo
    ‣ Cohérente                 ‣ Soft   State
     ‣   toujours état stable    ‣   cohérence moins grave
    ‣ Isolée                    ‣ Eventually     Consistent
     ‣   commits simultanés      ‣   propagation / correction
    ‣ Durable
     ‣   en cas de crash

    => Commit et rollback       => Reprise sur erreur
Questions ?
  SIG                         théorie des jeux


                                                               CRM
                grammaires

                                              optimisation



    forme normale
                             Merci !                         algos génétiques

                                négociation




  recrutement                       orthographe
                                                                 GED

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Ce que j'aurais voulu savoir

  • 1. Ce que j’aurais voulu savoir... @parisrb 12/11/2012 & @humantalks 13/11/2012 @abelar_s «There are only two hard things in Computer Science: cache invalidation and naming things » -- Phil Karlton
  • 2. Qui suis-je ? ‣ @EPITA ‣ @FaveodFr ‣ @ParisRB ‣ ingénieur R&D pragmatique ‣ geek, créateur de jeu de société ‣ entrepreneur, associé ‣ manager, chef de projet ‣ ... ‣ ... ‣ ... ‣ ... ‣ ... ‣ développeur
  • 3. Un enfer quand on ne connaît pas
  • 4. 5mn quand on connaît
  • 5. Sans Heavy Wizardry Apprenez ailleurs Casse-têtes ‣ regexp ‣ horodatage ‣ HTTP / REST ‣ encodages ‣ SCM : SVN / Git ‣ ... ‣ TDD / BDD / DDD ‣ parsers / lexers ‣ compilateurs OS Théories ‣ mémoire ‣ IA ‣ ordonnancement ‣ probabilités ‣ assembleur ‣ complexité O(?) ‣ optimisation ‣ Aspect Oriented ‣ interruptions ‣ systèmes typage ‣ sécurité ‣ P = NP ???
  • 6. State Machines -> Pierre Couzy ‣ États ‣ Événements ‣ Transitions ‣ « Before you need it, it’s overkill; by the time you need it, it’s too late » ‣ les RegExp sont des FSM !
  • 7. ETL -> @thibaut_barrere ‣ Extract ‣ CSV / XLS / SQL ‣ Transform ‣ 12 -> User.find(12) ‣ Load ‣ upsert ‣ activewarehouse_etl ? ‣ datawarehouse, analytics, background jobs... o/
  • 8. Outils Unix -> @chastell ‣ Chercher : grep, find, xargs ‣ Comparer : diff, comm ‣ Remplacer : sed, awk, ... ‣ Connecter : ssh, screen ‣ Lancer : crontab ‣ ... ‣ Rubyists : sort, uniq... zip et transpose ? ‣ Savez-vous piper les choux ?
  • 9. CAP Theorem http://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed ‣ Consistency C ‣ Availability ‣ Partition tolerance A P Pick two? SQL / NoSQL == ACID / BASE ? /! C de CAP != C de ACID ‣ C CAP : tous les nodes ont la même donnée ‣ C ACID : toujours dans un état valide
  • 10. Pour référence... ACID BASE ‣ Atomique ‣ Basic Availability ‣ indivisible ‣ haute dispo ‣ Cohérente ‣ Soft State ‣ toujours état stable ‣ cohérence moins grave ‣ Isolée ‣ Eventually Consistent ‣ commits simultanés ‣ propagation / correction ‣ Durable ‣ en cas de crash => Commit et rollback => Reprise sur erreur
  • 11. Questions ? SIG théorie des jeux CRM grammaires optimisation forme normale Merci ! algos génétiques négociation recrutement orthographe GED