Resilient Applicationswith Circuit Breakers

FAULT TOLERANCE

failure

BREAKDOWN AV

AIL

AB

ILIT

Y

criti

calgr

acef

ulde

grad

atio

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design

THROUGHPUT

response timeR

ELI

AB

ILIT

Yredu

ndan

cy

replication

perfo

rman

ce

ROBUSTNESS

RE

SIL

IEN

CY

fail-fast

fail-safe

isol

atio

n

Fault Tolerance

● Systems will fail

● But keep delivering service

“Unanticipated actions shouldn’t result in unanticipated behavior from the whole system.” - Brian Troutwine

Perfection

● Reduce probability of undiscovered behavior

● Expensive (planning, engineer, time)

Hope for the best

● Move fast and break things

● Cheaper in the short-term

● Hard to flip a switch

Embracing Failure

● Faults will occur

● Faults are tolerable

● Modular design

“We should write software that is cynical and expects bad things to happen.” - Michael T. Nygard

Circuit Breaker

Solutions

● Netflix Hystrix

● Camel Load Balancer

● Spring Cloud Netflix

References

● “Fault Tolerance on the Cheap”, Brian Troutwine

https://blog.codeship.com/fault-tolerance-on-the-cheap-part-1/

● “Release It”, Michael T. Nygard

http://www.amazon.com/Release-Production-Ready-Software-Pragmatic-Programmers/dp/0978739213

● “Circuit Breaker”, Martin Fowler

http://martinfowler.com/bliki/CircuitBreaker.html

● “Circuit Breaker Pattern in Apache Camel”, Bilgin Ibryam

https://dzone.com/articles/circuit-breaker-pattern-apache