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ASYNC JOB EXECUTION
         MIT SYMFONY2
                  ‘Die Welt ist nicht genug’




Wolfgang Münder
Browser             Apache PHP




          Timeout
Browser          Apache PHP   PHP




          Done
PROBLEMSTELLUNG


• Hoher   Zeitaufwand (Timeout!)

• Hoher   Speicherbedarf

• User   braucht Ergebnis nicht sofort
ANFORDERUNGEN

• Client-Prozesse

• Job-Server        (ggf. mehrere)

• Worker       auf mehreren Async-Servern

• Konfigurierbar

    •   Jobtypen (pro Worker)

    •   Job Priorität

    •   Worker-Instanzen pro Server

                                            Image (c) http://gearman.org/
FRAMEWORK


• Job   Queuing System

  • Gearman

• Alternative: Message   Queue

  • ActiveMQ, RabbitMQ, ZeroMQ
CLIENT
‘In tödlicher Mission’
CLIENT
•   Best practice: GearmanClient abstrahieren

    •   Symfony2 Service

•   Schlankes Interface

    •   Job einstellen

    •   Job Status abrufen

    •   Job Output abrufen

    •   Überblick über alle Jobs/Jobtypen
JOB-SERVER
  ‘Octopussy’
WORKER
‘Stirb an einem anderen Tag’
SYMFONY2 FRISST SPEICHER
      Lass es nicht lange leben.
TRENNE WORKER UND JOBS
WORKER COMMAND
  ‘Leben und sterben lassen’
WORKER COMMAND


• Lebt   ewig (supervisor)

• Registriert   sich für Jobtypen (laut config)

• Startet   Job Commands (proc_open)

• Organisiert    Kommunikation

• Best   practice: GearmanWorker, GearmanJob abstrahiert
WORKER COMMAND


• Nice   to have

 • Eigenes   Logfile für Worker

 • Logging   mit hostname + process_id
JOB COMMAND
 ‘Man lebt nur zweinmal’
JOB COMMAND


• Lebt   nur für einen Job

• Vollständig   entkoppelt vom Job-Framework

• Änderungen     im Code sofort verfügbar

• Eigenes   Command pro Jobtyp
JOB COMMAND
•   Nice to have

    •   Eigenes Logfile pro Jobtyp

    •   Logging mit hostname + process_id

    •   Generische Fehlerbehandlung

    •   E-Mail im Fehlerfall

    •   Xhprof Profiling

    •   Login über serialisierten Token
TESTS
‘Ein Quantum Trost’
TESTS

• Infrastruktur   immer nur bedingt testbar

• Test-Client

  • Prüft   ob Jobs korrekt eingestellt werden

  • Prüft   ob Jobs korrekte Argumente erhalten

• Job   Commands individuell testbar
GEARMAN
Job-Server auf mehreren Servern funktioniert nicht
GEARMAN
Job-Priorität nicht über Jobtypen hinweg
GEARMAN
Output abrufen nur ‘händisch’
FAZIT


• Gearman       löst Timeout-Probleme

• Generische      Implementierung durch Abstraktion

• Gearman       löst das Skalierungsproblem aber nicht vollständig



wolfgang.muender@tngtech.com

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Async Job Execution mit Symfony2