Circuit breaker YoungBlood @Paris Jug
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Transcript of Circuit breaker YoungBlood @Paris Jug
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LE CIRCUIT BREAKER PATTERN
Tolérance Aux PannesAvec
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Mouhcine Moulou
@mouloumouhcine
Consultant Scala
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Service 1 Service 2
PROBLÈME
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PROBLÈME
Service 1 Service 2
Gaspillage des Resources VM (Thread, Mémoire, etc.)
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PROBLÈME
Service 1 Service 2timeout
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PROBLÈME
Service 1 Service 2timeout
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Performance
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PROBLÈME
Service 1
Service 3
Service 2
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PROBLÈME
Service 1
Service 3
Service 2
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PROBLÈME
Service 1
Service 3
Service 2
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PROBLÈME
Service 1
Service 3
Service 2
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CASCADING FAILURES
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SOLUTION
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SOLUTION
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« Let It Crash & Handle with Grace. »
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Service 1 Service 2
CIRCUIT BREAKER
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Service 1 Service 2
CIRCUIT BREAKER
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Service 1 Service 2
CIRCUIT BREAKER
Closed
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Service 1 Service 2
CIRCUIT BREAKER
Open
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CIRCUIT BREAKER
Closed
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CIRCUIT BREAKER
Closed Open
Max Failures
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CIRCUIT BREAKER
Closed Open
Half Open
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Reset Timeout
Max Failures
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CIRCUIT BREAKER
Closed Open
Half Open
?
Reset TimeoutKO
OK
Max Failures
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EXEMPLE (AKKA IMPLEMENTATION)
CircuitBreaker breaker = new CircuitBreaker( getContext().dispatcher(), // L'actor System getContext().system().scheduler(), // Scheduler 50, // maxFailures Duration.create(10, "s"), // Call Timeout Duration.create(1, "m") // Reset Timeout);
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EXEMPLE (AKKA IMPLEMENTATION)
// Sans Circuit Breaker return dangerousCall();
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EXEMPLE (AKKA IMPLEMENTATION)
// Callable new Callable<String>() { public String call() throws Exception { return dangerousCall(); } }
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EXEMPLE (AKKA IMPLEMENTATION)
// Avec Circuit Breaker // Appel Javabreaker.callWithSyncCircuitBreaker( new Callable<String>() { public String call() throws Exception { return dangerousCall(); } });
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EXEMPLE (AKKA IMPLEMENTATION)
// Avec Circuit Breaker // Appel Scalabreaker.callWithCircuitBreaker( Future( dangerousCall()))
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CIRCUIT BREAKER
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Avantages•Réponse rapide.•Meilleur utilisation des resources.•Cascading failures.•Monitoring.
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CIRCUIT BREAKER
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Avantages•Réponse rapide.•Meilleur utilisation des resources.•Cascading failures.•Monitoring.
Inconvénients• Impossibilité de filtrer les exceptions
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CIRCUIT BREAKER
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ESSAYEZ LE !
Avantages•Réponse rapide.•Meilleur utilisation des resources.•Cascading failures.•Monitoring.
Inconvénients• Impossibilité de filtrer les exceptions
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