Modern sunucusuz mimarilerde uygulamalar\u0131n\u0131z\u0131n s\u00fcrekli \u00e7al\u0131\u015f\u0131r durumda kalmas\u0131n\u0131 sa\u011flamak zorlu bir g\u00f6rev olabilir. Circuit Breaker deseni, da\u011f\u0131t\u0131k sistemlerdeki d\u0131\u015f servis ba\u011f\u0131ml\u0131l\u0131klar\u0131n\u0131n neden oldu\u011fu kesintileri en aza indirerek uygulaman\u0131z\u0131n dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 art\u0131rman\u0131n anahtar\u0131d\u0131r. Bu makale, sunucusuz i\u015f y\u00fcklerinizi daha diren\u00e7li hale getirmek i\u00e7in Circuit Breaker desenini ad\u0131m ad\u0131m nas\u0131l uygulayaca\u011f\u0131n\u0131z\u0131 ve y\u00f6netti\u011finizi detayland\u0131racakt\u0131r.<\/p>\n
G\u00fcn\u00fcm\u00fcz\u00fcn h\u0131zla geli\u015fen yaz\u0131l\u0131m ekosisteminde, bulut tabanl\u0131 sunucusuz mimariler (Serverless Architectures), geli\u015ftiricilere uygulama da\u011f\u0131t\u0131m\u0131 ve \u00f6l\u00e7eklendirme konusunda e\u015fi g\u00f6r\u00fclmemi\u015f bir esneklik sunmaktad\u0131r. AWS Lambda, Azure Functions veya Google Cloud Functions gibi platformlar sayesinde, geli\u015ftiriciler altyap\u0131 y\u00f6netimiyle u\u011fra\u015fmadan yaln\u0131zca i\u015f mant\u0131\u011f\u0131na odaklanabilirler. Ancak bu kolayl\u0131k, beraberinde yeni zorluklar\u0131 da getirir: da\u011f\u0131t\u0131k sistemlerdeki bile\u015fenler aras\u0131 ba\u011f\u0131ml\u0131l\u0131klar ve bu ba\u011f\u0131ml\u0131l\u0131klar\u0131n potansiyel hata noktalar\u0131. Bir sunucusuz uygulama genellikle birden fazla mikroservis, veritaban\u0131, \u00f6nbellek ve \u00fc\u00e7\u00fcnc\u00fc taraf API ile entegre \u00e7al\u0131\u015f\u0131r. Bu bile\u015fenlerden herhangi birinin ge\u00e7ici veya kal\u0131c\u0131 olarak yan\u0131t verememesi, t\u00fcm uygulaman\u0131n performans\u0131n\u0131 olumsuz etkileyebilir, hatta tamamen \u00e7\u00f6kmesine neden olabilir.<\/p>\n
\u0130\u015fte tam da bu noktada “dayan\u0131kl\u0131l\u0131k” kavram\u0131 devreye giriyor. Dayan\u0131kl\u0131l\u0131k (Resilience), bir sistemin hatalara ra\u011fmen i\u015flevselli\u011fini s\u00fcrd\u00fcrebilme yetene\u011fidir. Sunucusuz ortamlarda, \u00f6zellikle d\u0131\u015f servis \u00e7a\u011fr\u0131lar\u0131 yaparken, ge\u00e7ici a\u011f sorunlar\u0131, servis kesintileri, a\u015f\u0131r\u0131 y\u00fcklenme veya beklenmedik yan\u0131t s\u00fcreleri gibi durumlarla s\u0131k\u00e7a kar\u015f\u0131la\u015f\u0131l\u0131r. Bu t\u00fcr durumlar, ba\u015far\u0131l\u0131 bir i\u015flem i\u00e7in beklenenden daha uzun s\u00fcre beklememize veya sonu\u00e7ta bir hatayla kar\u015f\u0131la\u015fmam\u0131za neden olabilir. Geleneksel yakla\u015f\u0131mlar, ba\u015far\u0131s\u0131z olan bir iste\u011fi hemen yeniden denemeyi i\u00e7erir; ancak bu, zaten sorun ya\u015fayan bir servisi daha da k\u00f6t\u00fc duruma sokabilir ve “\u00e7a\u011flayan hatas\u0131” (cascading failure) olarak bilinen etkiyi tetikleyebilir. Bir servisin yava\u015flamas\u0131 veya hata vermesi, ona ba\u011f\u0131ml\u0131 olan di\u011fer servislerin de yava\u015flamas\u0131na veya hata vermesine yol a\u00e7ar, bu da t\u00fcm sistemin performans\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcr. Bu nedenle, sunucusuz i\u015f y\u00fcklerimizde proaktif hata y\u00f6netimi stratejileri benimsemek, hem kullan\u0131c\u0131 deneyimini iyile\u015ftirmek hem de operasyonel maliyetleri d\u00fc\u015f\u00fcrmek a\u00e7\u0131s\u0131ndan hayati \u00f6nem ta\u015f\u0131r. Circuit Breaker deseni, bu t\u00fcr senaryolarda devreye girerek, potansiyel felaketleri \u00f6nlemek ve sistemin genel sa\u011fl\u0131\u011f\u0131n\u0131 korumak i\u00e7in g\u00fc\u00e7l\u00fc bir mekanizma sunar. Bu desenin temel amac\u0131, ba\u015far\u0131s\u0131z servislerle gereksiz yere ileti\u015fim kurmaktan ka\u00e7\u0131nmak ve onlara toparlanma s\u00fcresi tan\u0131makt\u0131r.<\/p>\n
Ayr\u0131ca, sunucusuz fonksiyonlar\u0131n ya\u015fam d\u00f6ng\u00fcs\u00fc de dayan\u0131kl\u0131l\u0131k stratejilerini farkl\u0131la\u015ft\u0131r\u0131r. So\u011fuk ba\u015flatma (cold start) s\u00fcreleri, bir fonksiyonun ilk kez \u00e7a\u011fr\u0131ld\u0131\u011f\u0131nda veya uzun bir s\u00fcre inaktif kald\u0131ktan sonra ba\u015flat\u0131lmas\u0131nda ya\u015fanan gecikmelerdir. Bu durumlar, d\u0131\u015f servis ba\u011f\u0131ml\u0131l\u0131klar\u0131yla birle\u015fti\u011finde, hatalara daha duyarl\u0131 hale gelebilir. Dolay\u0131s\u0131yla, Circuit Breaker desenini uygularken, bu t\u00fcr sunucusuz \u00f6zelliklerin de g\u00f6z \u00f6n\u00fcnde bulundurulmas\u0131 gerekir. Geli\u015ftiricilerin, sistemlerinin s\u00fcrekli olarak y\u00fcksek performans ve kullan\u0131labilirlikle \u00e7al\u0131\u015ft\u0131\u011f\u0131ndan emin olmak i\u00e7in bu t\u00fcr senaryolar\u0131 tasar\u0131mlar\u0131na dahil etmeleri kritik \u00f6neme sahiptir. B\u00f6ylece, kullan\u0131c\u0131lar\u0131n kesintisiz bir deneyim ya\u015famas\u0131n\u0131 sa\u011flarken, operasyonel ekiplerin de daha az sorunla kar\u015f\u0131la\u015fmas\u0131 hedeflenir.<\/p>\n
Circuit Breaker (Devre Kesici) deseni, elektrik devrelerindeki bir sigorta gibi \u00e7al\u0131\u015f\u0131r: bir ar\u0131za alg\u0131land\u0131\u011f\u0131nda devreyi keser ve hasar\u0131 \u00f6nler. Yaz\u0131l\u0131m m\u00fchendisli\u011finde ise bu desen, bir d\u0131\u015f servise yap\u0131lan \u00e7a\u011fr\u0131lar\u0131n belirli bir oranda veya say\u0131da ba\u015far\u0131s\u0131z olmas\u0131 durumunda, bu servise yap\u0131lan t\u00fcm sonraki \u00e7a\u011fr\u0131lar\u0131 belirli bir s\u00fcre i\u00e7in engeller. Bu, hem ar\u0131zal\u0131 servisin a\u015f\u0131r\u0131 y\u00fcklenmesini \u00f6nler hem de uygulaman\u0131z\u0131n bu ar\u0131zal\u0131 servise s\u00fcrekli ba\u015far\u0131s\u0131z istekler g\u00f6ndererek kaynaklar\u0131n\u0131 israf etmesinin \u00f6n\u00fcne ge\u00e7er. Desen, \u00fc\u00e7 ana durum (state) etraf\u0131nda d\u00f6ner:<\/p>\n
CircuitBreakerError<\/code>) d\u00f6nd\u00fcr\u00fcl\u00fcr. Bu durum belirli bir s\u00fcre (reset_timeout<\/code>) devam eder, ard\u0131ndan devre kesici “Half-Open” durumuna ge\u00e7er.<\/li>\n- Half-Open (Yar\u0131-A\u00e7\u0131k):<\/strong> Devre kesicinin ar\u0131zal\u0131 servisin toparlan\u0131p toparlanmad\u0131\u011f\u0131n\u0131 kontrol etmek i\u00e7in deneme yapt\u0131\u011f\u0131 durumdur. Bu durumda, s\u0131n\u0131rl\u0131 say\u0131da istek d\u0131\u015f servise g\u00f6nderilir. E\u011fer bu istekler ba\u015far\u0131l\u0131 olursa, devre kesici tekrar “Closed” duruma ge\u00e7er. Ba\u015far\u0131s\u0131z olurlarsa, tekrar “Open” duruma d\u00f6ner ve bekleme s\u00fcresi s\u0131f\u0131rlan\u0131r.<\/li>\n<\/ul>\n
Sunucusuz ortamlarda bu desenin hayati \u00f6nemi birka\u00e7 a\u00e7\u0131dan ele al\u0131nabilir. \u00d6ncelikle, sunucusuz fonksiyonlar genellikle k\u0131sa \u00f6m\u00fcrl\u00fc ve durumsuz (stateless) yap\u0131dad\u0131r. Her bir \u00e7a\u011fr\u0131, yeni bir ortamda y\u00fcr\u00fct\u00fclebilir ve bu da geleneksel sistemlerdeki uzun \u00f6m\u00fcrl\u00fc ba\u011flant\u0131 havuzlar\u0131n\u0131n veya \u00f6nbelleklerin faydalar\u0131n\u0131 azalt\u0131r. Bir fonksiyonun bir d\u0131\u015f servisi \u00e7a\u011f\u0131rmas\u0131 gerekti\u011finde ve o servis ar\u0131zal\u0131 oldu\u011funda, fonksiyonun zaman a\u015f\u0131m\u0131na u\u011framas\u0131 veya hata vermesi, fonksiyonun y\u00fcr\u00fctme s\u00fcresini art\u0131r\u0131r ve gereksiz maliyetlere yol a\u00e7ar. Circuit Breaker, bu t\u00fcr durumlarda gereksiz \u00e7a\u011fr\u0131lar\u0131 h\u0131zla engelleyerek hem maliyetleri d\u00fc\u015f\u00fcr\u00fcr hem de fonksiyonun daha h\u0131zl\u0131 yan\u0131t vermesini sa\u011flar.<\/p>\n
\u0130kincisi, sunucusuz mimarilerde “\u00e7a\u011flayan hatas\u0131” riski daha da y\u00fcksektir \u00e7\u00fcnk\u00fc genellikle y\u00fczlerce, hatta binlerce fonksiyon birbiriyle entegre \u00e7al\u0131\u015f\u0131r. Bir mikroservisin hatas\u0131, ona ba\u011f\u0131ml\u0131 olan di\u011fer t\u00fcm sunucusuz fonksiyonlar\u0131 etkileyebilir. Circuit Breaker, bu zincirleme reaksiyonu k\u0131rarak, ar\u0131zan\u0131n yay\u0131lmas\u0131n\u0131 s\u0131n\u0131rlar ve sistemin genel sa\u011fl\u0131\u011f\u0131n\u0131 korur. Bu sayede, tek bir d\u0131\u015f servis ar\u0131zas\u0131 t\u00fcm uygulaman\u0131n \u00e7\u00f6kmesine yol a\u00e7maz, sadece ilgili fonksiyonun bu servise eri\u015fimini ge\u00e7ici olarak k\u0131s\u0131tlar.<\/p>\n
Son olarak, Circuit Breaker deseni, operasyonel y\u00fck\u00fc azaltmaya yard\u0131mc\u0131 olur. Otomatik olarak ba\u015far\u0131s\u0131z servisleri alg\u0131lay\u0131p \u00e7a\u011fr\u0131lar\u0131 durdurarak, manuel m\u00fcdahale ihtiyac\u0131n\u0131 azalt\u0131r. Bu da, geli\u015ftirme ve operasyon (DevOps) ekiplerinin ar\u0131zal\u0131 servisleri tespit edip d\u00fczeltmek i\u00e7in zaman kazanmas\u0131n\u0131 sa\u011flar. K\u0131sacas\u0131, Circuit Breaker deseni, sunucusuz i\u015f y\u00fckleriniz i\u00e7in sadece bir optimizasyon de\u011fil, ayn\u0131 zamanda temel bir hata y\u00f6netimi stratejisidir. Bu deseni uygulayarak, sistemlerinizin daha esnek, dayan\u0131kl\u0131 ve maliyet etkin olmas\u0131n\u0131 sa\u011flars\u0131n\u0131z.<\/p>\n
Uygulamal\u0131 K\u0131s\u0131m: AWS Lambda ve Python ile Circuit Breaker \u00d6rne\u011fi<\/h2>\n
Circuit Breaker desenini sunucusuz bir ortamda, \u00f6zellikle AWS Lambda \u00fczerinde Python kullanarak nas\u0131l uygulayaca\u011f\u0131m\u0131z\u0131 ad\u0131m ad\u0131m inceleyelim. Bu \u00f6rnekte, basit bir d\u0131\u015f API \u00e7a\u011fr\u0131s\u0131n\u0131 sim\u00fcle edecek ve bu \u00e7a\u011fr\u0131 ba\u015far\u0131s\u0131z oldu\u011funda devre kesicinin nas\u0131l davrand\u0131\u011f\u0131n\u0131 g\u00f6zlemleyece\u011fiz. Python i\u00e7in pybreaker<\/code> k\u00fct\u00fcphanesi bu i\u015f i\u00e7in olduk\u00e7a uygun bir se\u00e7imdir.<\/p>\nAd\u0131m 1: Gerekli K\u00fct\u00fcphaneleri Kurma<\/h3>\n
Lambda katmanlar\u0131 (Lambda Layers) kullanarak pybreaker<\/code> k\u00fct\u00fcphanesini Lambda fonksiyonunuza dahil edebilirsiniz. \u00d6ncelikle yerel makinenizde bir klas\u00f6r olu\u015fturun ve k\u00fct\u00fcphaneyi i\u00e7ine kurun:<\/p>\n\nmkdir python && cd python\npip install pybreaker -t .\nzip -r ..\/pybreaker_layer.zip .\n <\/pre>\n<\/code><\/p>\n
Bu ZIP dosyas\u0131n\u0131 AWS Lambda Katman\u0131 olarak y\u00fckledikten sonra, Lambda fonksiyonunuz bu k\u00fct\u00fcphaneye eri\u015febilir olacakt\u0131r.<\/p>\n
Ad\u0131m 2: Lambda Fonksiyonunu Tasarlama<\/h3>\n
\u015eimdi, pybreaker<\/code> kullanarak d\u0131\u015f servisi \u00e7a\u011f\u0131ran bir Lambda fonksiyonu olu\u015ftural\u0131m. Fonksiyonumuz, d\u0131\u015f servis \u00e7a\u011fr\u0131s\u0131n\u0131 sim\u00fcle edecek ve devre kesicinin nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 g\u00f6sterecektir.<\/p>\n\u0130lk olarak, devre kesiciyi yap\u0131land\u0131rmam\u0131z gerekiyor. fail_max<\/code> parametresi, devre kesicinin \"Open\" duruma ge\u00e7meden \u00f6nce ka\u00e7 ba\u015far\u0131s\u0131zl\u0131\u011fa izin verece\u011fini belirtir. reset_timeout<\/code> ise \"Open\" durumundan \"Half-Open\" durumuna ge\u00e7meden \u00f6nce ne kadar beklenece\u011fini saniye cinsinden tan\u0131mlar. exclude<\/code> parametresi ile belirli hata t\u00fcrlerinin devre kesici sayac\u0131n\u0131 tetiklemesini engelleyebiliriz (\u00f6rne\u011fin, beklenmeyen uygulama hatalar\u0131 yerine sadece a\u011f hatalar\u0131n\u0131 saymak isteyebiliriz).<\/p>\n\nimport os\nimport random\nimport time\nfrom pybreaker import CircuitBreaker, CircuitBreakerError\nimport logging\n\n# Logger yap\u0131land\u0131rmas\u0131\nlogger = logging.getLogger()\nlogger.setLevel(os.environ.get(\"LOG_LEVEL\", \"INFO\").upper())\n\n# Circuit Breaker yap\u0131land\u0131rmas\u0131\n# fail_max: Ka\u00e7 ba\u015far\u0131s\u0131zl\u0131ktan sonra devre kesici a\u00e7\u0131lacak?\n# reset_timeout: Devre kesici ka\u00e7 saniye sonra Half-Open durumuna ge\u00e7ecek?\n# exclude: Hangi istisnalar devre kesici hatas\u0131 olarak say\u0131lmayacak?\ncircuit_breaker = CircuitBreaker(fail_max=3, reset_timeout=10, exclude=[TypeError])\n\n# D\u0131\u015f servisi \u00e7a\u011f\u0131ran fonksiyonu sim\u00fcle ediyoruz.\n# Bu fonksiyon Circuit Breaker taraf\u0131ndan sar\u0131lacak.\ndef call_external_api_simulate():\n \"\"\"\n D\u0131\u015f bir API \u00e7a\u011fr\u0131s\u0131n\u0131 sim\u00fcle eder. Ba\u015far\u0131s\u0131zl\u0131k olas\u0131l\u0131\u011f\u0131 y\u00fcksektir.\n \"\"\"\n if random.random() < 0.7: # %70 ihtimalle hata d\u00f6nd\u00fcr\n logger.warning(\"D\u0131\u015f API \u00e7a\u011fr\u0131s\u0131 ba\u015far\u0131s\u0131z oldu!\")\n raise ConnectionError(\"D\u0131\u015f API'ye ba\u011flan\u0131lamad\u0131 veya zaman a\u015f\u0131m\u0131na u\u011frad\u0131.\")\n logger.info(\"D\u0131\u015f API \u00e7a\u011fr\u0131s\u0131 ba\u015far\u0131l\u0131 oldu.\")\n return \"API'den ba\u015far\u0131l\u0131 yan\u0131t\"\n\n@circuit_breaker\ndef guarded_external_api_call():\n \"\"\"\n Circuit Breaker taraf\u0131ndan korunan d\u0131\u015f API \u00e7a\u011fr\u0131s\u0131.\n \"\"\"\n return call_external_api_simulate()\n\ndef lambda_handler(event, context):\n try:\n logger.info(f\"Devre Kesici Durumu: {circuit_breaker.current_state}\")\n result = guarded_external_api_call()\n return {\n \"statusCode\": 200,\n \"body\": f\"Servis Yan\u0131t\u0131: {result}. Devre Kesici Durumu: {circuit_breaker.current_state}\"\n }\n except CircuitBreakerError:\n logger.error(\"Circuit Breaker a\u00e7\u0131k! D\u0131\u015f servis \u00e7a\u011fr\u0131s\u0131 engellendi.\")\n return {\n \"statusCode\": 503,\n \"body\": f\"Hata: Servis ge\u00e7ici olarak kullan\u0131lam\u0131yor. Circuit Breaker durumu: {circuit_breaker.current_state}\"\n }\n except ConnectionError as e:\n logger.error(f\"D\u0131\u015f servis hatas\u0131 alg\u0131land\u0131: {e}\")\n return {\n \"statusCode\": 500,\n \"body\": f\"Hata: D\u0131\u015f serviste bir sorun olu\u015ftu: {e}. Circuit Breaker durumu: {circuit_breaker.current_state}\"\n }\n except Exception as e:\n logger.error(f\"Beklenmeyen bir hata olu\u015ftu: {e}\")\n return {\n \"statusCode\": 500,\n \"body\": f\"Hata: Beklenmeyen bir hata olu\u015ftu: {e}\"\n }\n <\/pre>\n<\/code><\/p>\n
Ad\u0131m 3: \u00c7al\u0131\u015fma Mant\u0131\u011f\u0131 ve G\u00f6zlem<\/h3>\n
Bu Lambda fonksiyonunu birden \u00e7ok kez tetikledi\u011finizde (\u00f6rne\u011fin bir API Gateway \u00fczerinden), Circuit Breaker'\u0131n nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 g\u00f6zlemleyebilirsiniz:<\/p>\n
\n- \u0130lk birka\u00e7 \u00e7a\u011fr\u0131da,
call_external_api_simulate<\/code> fonksiyonu muhtemelen ba\u015far\u0131s\u0131z olacakt\u0131r (%70 olas\u0131l\u0131kla).<\/li>\n- Ba\u015far\u0131s\u0131z \u00e7a\u011fr\u0131 say\u0131s\u0131
fail_max<\/code> (3) de\u011ferine ula\u015ft\u0131\u011f\u0131nda, Circuit Breaker \"Open\" durumuna ge\u00e7ecektir.<\/li>\n- Circuit Breaker \"Open\" durumundayken yap\u0131lan t\u00fcm sonraki \u00e7a\u011fr\u0131lar, d\u0131\u015f servise ula\u015fmadan do\u011frudan
CircuitBreakerError<\/code> f\u0131rlatacak ve h\u0131zl\u0131 bir \u015fekilde hata yan\u0131t\u0131 d\u00f6necektir. Bu, d\u0131\u015f servisin toparlanmas\u0131 i\u00e7in zaman tan\u0131rken, uygulaman\u0131z\u0131n da kaynak israf\u0131n\u0131 \u00f6nler.<\/li>\nreset_timeout<\/code> (10 saniye) s\u00fcresi dolduktan sonra, devre kesici \"Half-Open\" durumuna ge\u00e7ecektir. Bu durumda, bir sonraki \u00e7a\u011fr\u0131 d\u0131\u015f servise g\u00f6nderilecektir.<\/li>\n- E\u011fer bu \"Half-Open\" durumdaki \u00e7a\u011fr\u0131 ba\u015far\u0131l\u0131 olursa, devre kesici tekrar \"Closed\" durumuna d\u00f6ner ve normal \u00e7al\u0131\u015fmaya devam eder. E\u011fer ba\u015far\u0131s\u0131z olursa, tekrar \"Open\" durumuna ge\u00e7er ve
reset_timeout<\/code> yeniden ba\u015flar.<\/li>\n<\/ol>\nBu \u00f6rnekte, random.random() < 0.7<\/code> ifadesiyle %70 oran\u0131nda bir hata olas\u0131l\u0131\u011f\u0131 tan\u0131mlad\u0131k. Ger\u00e7ek bir senaryoda bu, bir a\u011f hatas\u0131, HTTP 5xx yan\u0131t\u0131 veya zaman a\u015f\u0131m\u0131 gibi durumlar olabilir. Circuit Breaker, bu t\u00fcr ge\u00e7ici hatalarla ba\u015fa \u00e7\u0131kmak ve sisteminizi daha dayan\u0131kl\u0131 hale getirmek i\u00e7in vazge\u00e7ilmez bir ara\u00e7t\u0131r.<\/p>\n\n Uzman \u0130pucu: Circuit Breaker durumunu izlemek, sisteminizin sa\u011fl\u0131\u011f\u0131 hakk\u0131nda de\u011ferli bilgiler sa\u011flar. AWS CloudWatch metriklerini veya da\u011f\u0131t\u0131k izleme ara\u00e7lar\u0131n\u0131 (\u00f6rne\u011fin, X-Ray) kullanarak devre kesici durum de\u011fi\u015fikliklerini, hata say\u0131lar\u0131n\u0131 ve gecikmeleri takip edebilirsiniz. Bu, sorunlar\u0131 proaktif bir \u015fekilde tespit etmenize yard\u0131mc\u0131 olur.\n <\/div>\nGer\u00e7ek D\u00fcnya Senaryosu: Bir E-ticaret Uygulamas\u0131nda Circuit Breaker Kullan\u0131m\u0131<\/h2>\n
Bir e-ticaret uygulamas\u0131n\u0131n \"\u00d6deme\" (Checkout) s\u00fcrecini ele alal\u0131m. Bu s\u00fcre\u00e7, kredi kart\u0131 i\u015fleme, envanter g\u00fcncelleme ve sipari\u015f onay e-postas\u0131 g\u00f6nderme gibi birden fazla d\u0131\u015f servise ba\u011f\u0131ml\u0131d\u0131r. Diyelim ki \u00f6deme i\u015flemini ger\u00e7ekle\u015ftiren sunucusuz bir Lambda fonksiyonunuz var ve bu fonksiyon, bir \u00fc\u00e7\u00fcnc\u00fc taraf \u00f6deme a\u011f ge\u00e7idi API'si (Payment Gateway API) ile ileti\u015fim kuruyor.<\/p>\n
Senaryo \u015fu \u015fekilde geli\u015febilir:<\/p>\n
\n- Normal \u00c7al\u0131\u015fma:<\/strong> M\u00fc\u015fteriler sepete \u00fcr\u00fcn ekler, \u00f6deme bilgilerini girer ve \u00f6deme i\u015flemini ba\u015flat\u0131r. Lambda fonksiyonu, \u00f6deme a\u011f ge\u00e7idi API'sine bir istek g\u00f6nderir ve ba\u015far\u0131l\u0131 bir yan\u0131t al\u0131r. Devre kesici \"Closed\" durumdad\u0131r.<\/li>\n
- Ge\u00e7ici Sorunlar Ba\u015flar:<\/strong> \u00d6deme a\u011f ge\u00e7idinde k\u0131sa s\u00fcreli bir kesinti veya a\u015f\u0131r\u0131 y\u00fcklenme ya\u015fan\u0131r. Lambda fonksiyonu API'ye istek g\u00f6nderdi\u011finde,
HTTP 500 Internal Server Error<\/code> veya bir a\u011f zaman a\u015f\u0131m\u0131 al\u0131r. Circuit Breaker bu ba\u015far\u0131s\u0131zl\u0131klar\u0131 saymaya ba\u015flar.<\/li>\n- Devre Kesici A\u00e7\u0131l\u0131r:<\/strong> Ard\u0131\u015f\u0131k birka\u00e7 ba\u015far\u0131s\u0131z denemenin ard\u0131ndan (\u00f6rne\u011fin,
fail_max=5<\/code> olarak ayarland\u0131ysa), Circuit Breaker \"Open\" durumuna ge\u00e7er. Bu andan itibaren, \u00f6deme Lambda's\u0131ndan gelen t\u00fcm \u00f6deme a\u011f ge\u00e7idi \u00e7a\u011fr\u0131lar\u0131, ger\u00e7ek API'ye ula\u015fmadan do\u011frudan CircuitBreakerError<\/code> f\u0131rlat\u0131r.<\/li>\n- Kullan\u0131c\u0131 Deneyimi:<\/strong> M\u00fc\u015fteriler \u00f6deme yapmaya \u00e7al\u0131\u015ft\u0131\u011f\u0131nda, sistem onlara \"\u00d6deme hizmetimiz \u015fu anda ge\u00e7ici olarak kullan\u0131lam\u0131yor, l\u00fctfen daha sonra tekrar deneyin\" gibi bir mesaj g\u00f6sterebilir veya \u00f6deme alternatifleri sunabilir. En \u00f6nemlisi, sistem, ba\u015far\u0131s\u0131z \u00f6deme a\u011f ge\u00e7idine s\u00fcrekli istek g\u00f6ndererek kendisini daha da k\u00f6t\u00fc duruma sokmaz.<\/li>\n
- Servisin Toparlanmas\u0131:<\/strong> \u00d6deme a\u011f ge\u00e7idi y\u00f6neticileri sorunu tespit eder ve d\u00fczeltir. Bu arada, Circuit Breaker'\u0131n
reset_timeout<\/code> s\u00fcresi dolar ve devre kesici \"Half-Open\" durumuna ge\u00e7er.<\/li>\n- Yeniden Deneme ve Normalle\u015fme:<\/strong> \"Half-Open\" durumundayken, bir m\u00fc\u015fteri \u00f6deme yapmaya \u00e7al\u0131\u015f\u0131r. Lambda fonksiyonu, \u00f6deme a\u011f ge\u00e7idine tek bir istek g\u00f6nderir. E\u011fer bu istek ba\u015far\u0131l\u0131 olursa, devre kesici tekrar \"Closed\" durumuna d\u00f6ner ve sistem normal \u00e7al\u0131\u015fmas\u0131na devam eder. E\u011fer hala ba\u015far\u0131s\u0131z olursa, devre kesici tekrar \"Open\" durumuna ge\u00e7er ve toparlanma s\u00fcresi yeniden ba\u015flar.<\/li>\n<\/ol>\n
Bu senaryoda Circuit Breaker'\u0131n faydalar\u0131 olduk\u00e7a a\u00e7\u0131kt\u0131r:<\/p>\n
\n- Kaynak Korumas\u0131:<\/strong> \u00d6deme Lambda's\u0131, ar\u0131zal\u0131 bir servisi gereksiz yere \u00e7a\u011f\u0131rmad\u0131\u011f\u0131 i\u00e7in AWS kaynaklar\u0131n\u0131 (CPU, bellek, a\u011f) israf etmez. Bu, hem maliyetleri d\u00fc\u015f\u00fcr\u00fcr hem de Lambda'n\u0131n genel performans\u0131n\u0131 korur.<\/li>\n
- H\u0131zl\u0131 Yan\u0131t:<\/strong> \"Open\" durumdayken, ba\u015far\u0131s\u0131z istekler an\u0131nda reddedilir, bu da kullan\u0131c\u0131lara daha h\u0131zl\u0131 geri bildirim sa\u011flar ve bekleme s\u00fcrelerini azalt\u0131r.<\/li>\n
- \u00c7a\u011flayan Hatalar\u0131n\u0131n \u00d6nlenmesi:<\/strong> \u00d6deme a\u011f ge\u00e7idi hatas\u0131, envanter servisini veya sipari\u015f ge\u00e7mi\u015fi servisini etkilemez, \u00e7\u00fcnk\u00fc \u00f6deme Lambda's\u0131 di\u011fer sistemleri a\u015f\u0131r\u0131 y\u00fcklemez.<\/li>\n
- Otomatik Kurtarma:<\/strong> Sistem, harici servisin toparlanmas\u0131n\u0131 otomatik olarak alg\u0131lar ve insan m\u00fcdahalesi olmadan normal operasyonlara d\u00f6ner.<\/li>\n<\/ul>\n
Bu vaka analizi, Circuit Breaker deseninin sadece bir teorik kavram olmad\u0131\u011f\u0131n\u0131, ayn\u0131 zamanda modern, da\u011f\u0131t\u0131k sistemlerin dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 ve g\u00fcvenilirli\u011fini art\u0131rmada pratik ve vazge\u00e7ilmez bir ara\u00e7 oldu\u011funu g\u00f6stermektedir. \u00d6zellikle finansal i\u015flemler gibi kritik s\u00fcre\u00e7lerde, bu t\u00fcr bir hata tolerans\u0131 mekanizmas\u0131, hem i\u015f s\u00fcreklili\u011fi hem de m\u00fc\u015fteri memnuniyeti a\u00e7\u0131s\u0131ndan hayati \u00f6nem ta\u015f\u0131r.<\/p>\n
\u0130leri D\u00fczey Optimizasyonlar ve \u0130pu\u00e7lar\u0131: Circuit Breaker'\u0131 Maksimum D\u00fczeyde Kullanma<\/h2>\n
Circuit Breaker desenini uygulamak harika bir ba\u015flang\u0131\u00e7t\u0131r, ancak sisteminizin dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 daha da art\u0131rmak i\u00e7in ileri d\u00fczey optimizasyonlar ve baz\u0131 \u00f6nemli ipu\u00e7lar\u0131 mevcuttur. Bu teknikler, devre kesicinin daha ak\u0131ll\u0131, esnek ve g\u00f6zlemlenebilir olmas\u0131n\u0131 sa\u011flar.<\/p>\n
1. Timeout ve Retry Politikalar\u0131yla Entegrasyon<\/h3>\n
Circuit Breaker genellikle \"timeout\" (zaman a\u015f\u0131m\u0131) ve \"retry\" (yeniden deneme) politikalar\u0131yla birlikte kullan\u0131l\u0131r. Bu \u00fc\u00e7 desen, birbirini tamamlay\u0131c\u0131 niteliktedir:<\/p>\n
\n- Timeout:<\/strong> D\u0131\u015f servise yap\u0131lan bir \u00e7a\u011fr\u0131n\u0131n ne kadar s\u00fcre beklenece\u011fini belirler. E\u011fer \u00e7a\u011fr\u0131 bu s\u00fcre i\u00e7inde yan\u0131t vermezse, zaman a\u015f\u0131m\u0131na u\u011frar. Circuit Breaker deseninde, bu zaman a\u015f\u0131m\u0131 hatalar\u0131 da ba\u015far\u0131s\u0131zl\u0131k olarak say\u0131labilir.<\/li>\n
- Retry:<\/strong> Ge\u00e7ici hatalar durumunda iste\u011fi otomatik olarak yeniden deneme mekanizmas\u0131d\u0131r. Ancak dikkatli kullan\u0131lmal\u0131d\u0131r; s\u00fcrekli yeniden deneme, ar\u0131zal\u0131 servisi daha da k\u00f6t\u00fc hale getirebilir. Circuit Breaker, retry desenini daha ak\u0131ll\u0131 hale getirir: devre kesici a\u00e7\u0131ksa, yeniden deneme bile yap\u0131lmaz.<\/li>\n<\/ul>\n
Entegrasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n\n- K\u0131sa TimeOutlar:<\/strong> Sunucusuz fonksiyonlar genellikle k\u0131sa \u00f6m\u00fcrl\u00fc oldu\u011fu i\u00e7in, d\u0131\u015f servis \u00e7a\u011fr\u0131lar\u0131 i\u00e7in k\u0131sa zaman a\u015f\u0131mlar\u0131 belirleyin. Bu, fonksiyonun gereksiz yere uzun s\u00fcre bekleyip pahal\u0131 kaynaklar\u0131 t\u00fcketmesini engeller.<\/li>\n
- Ak\u0131ll\u0131 Yeniden Denemeler:<\/strong> Circuit Breaker \"Closed\" durumdayken, ge\u00e7ici a\u011f hatalar\u0131 gibi belirli hatalar i\u00e7in s\u0131n\u0131rl\u0131 say\u0131da (\u00f6rne\u011fin 1 veya 2 kez) ve artan gecikmeyle (exponential backoff) yeniden denemeler yap\u0131n. Devre kesici \"Open\" durumdayken asla yeniden deneme yapmay\u0131n.<\/li>\n<\/ul>\n
2. Fallback Mekanizmalar\u0131<\/h3>\n
Circuit Breaker \"Open\" durumdayken, uygulaman\u0131z\u0131n tamamen hata vermesi yerine alternatif bir yol sunmas\u0131 iyi bir pratik. Bu, \"fallback\" olarak bilinir. Fallback, servisin kullan\u0131lamaz oldu\u011fu durumlarda bile temel i\u015flevselli\u011fi s\u00fcrd\u00fcrmeye yard\u0131mc\u0131 olur:<\/p>\n
\n- \u00d6nbellek Verisi Kullanma:<\/strong> E\u011fer d\u0131\u015f servis bir veri kayna\u011f\u0131 ise, \u00f6nbelle\u011fe al\u0131nm\u0131\u015f son ba\u015far\u0131l\u0131 veriyi d\u00f6nd\u00fcrebilirsiniz.<\/li>\n
- Varsay\u0131lan De\u011ferler:<\/strong> Servisin kritik olmad\u0131\u011f\u0131 durumlarda, g\u00fcvenli varsay\u0131lan de\u011ferler d\u00f6nd\u00fcrerek uygulaman\u0131n devam etmesini sa\u011flayabilirsiniz.<\/li>\n
- Alternatif Servis:<\/strong> Farkl\u0131 bir b\u00f6lgedeki yedek servisi veya daha basit bir alternatif API'yi kullanmaya \u00e7al\u0131\u015fabilirsiniz.<\/li>\n<\/ul>\n
\n# pybreaker ile fallback \u00f6rne\u011fi\nfrom pybreaker import CircuitBreaker, CircuitBreakerError\n\nbreaker_with_fallback = CircuitBreaker(fail_max=3, reset_timeout=10)\n\ndef get_data_from_primary_service():\n # Primary servis \u00e7a\u011fr\u0131s\u0131n\u0131 sim\u00fcle et\n if random.random() < 0.8:\n raise ConnectionError(\"Primary servis kapal\u0131!\")\n return \"Ana Servis Verisi\"\n\ndef get_data_from_cache():\n # Fallback olarak \u00f6nbellekten veri d\u00f6nd\u00fcr\n return \"\u00d6nbellekten Al\u0131nan Veri (Fallback)\"\n\n@breaker_with_fallback\ndef get_data_with_fallback():\n try:\n return get_data_from_primary_service()\n except CircuitBreakerError:\n # Devre kesici a\u00e7\u0131k oldu\u011funda fallback'i tetikle\n return get_data_from_cache()\n\n# Kullan\u0131m\n# data = get_data_with_fallback()\n <\/pre>\n<\/code><\/p>\n
3. \u0130zleme ve Uyar\u0131lar<\/h3>\n
Circuit Breaker deseninin etkinli\u011fini sa\u011flamak i\u00e7in kapsaml\u0131 izleme \u015fartt\u0131r. A\u015fa\u011f\u0131daki metrikleri izlemelisiniz:<\/p>\n
\n- Devre Kesici Durumu:<\/strong> \"Closed\", \"Open\", \"Half-Open\" durum de\u011fi\u015fiklikleri.<\/li>\n
- Ba\u015far\u0131s\u0131zl\u0131k Say\u0131s\u0131\/Oran\u0131:<\/strong> Devre kesicinin a\u00e7\u0131lmas\u0131na neden olan ba\u015far\u0131s\u0131z \u00e7a\u011fr\u0131lar\u0131n say\u0131s\u0131.<\/li>\n
- Engellenen \u00c7a\u011fr\u0131lar:<\/strong> Devre kesici \"Open\" durumdayken do\u011frudan reddedilen \u00e7a\u011fr\u0131lar\u0131n say\u0131s\u0131.<\/li>\n<\/ul>\n
Bu metrikleri AWS CloudWatch, Prometheus veya benzeri izleme ara\u00e7lar\u0131 ile toplayabilir ve belirli e\u015fikler a\u015f\u0131ld\u0131\u011f\u0131nda (\u00f6rne\u011fin, devre kesici \"Open\" duruma ge\u00e7ti\u011finde) uyar\u0131lar (SMS, e-posta, Slack) g\u00f6nderebilirsiniz. Bu sayede operasyonel ekipler sorunlar\u0131 h\u0131zl\u0131ca tespit edip m\u00fcdahale edebilir.<\/p>\n
4. Dinamik Yap\u0131land\u0131rma ve A\/B Testleri<\/h3>\n
Circuit Breaker parametreleri (fail_max<\/code>, reset_timeout<\/code>) uygulama ve ba\u011f\u0131ml\u0131 servisin \u00f6zelliklerine g\u00f6re optimize edilmelidir. Bu parametreleri do\u011frudan kodda sabitlemek yerine, AWS AppConfig veya AWS Systems Manager Parameter Store gibi servislerden dinamik olarak y\u00fcklemeyi d\u00fc\u015f\u00fcnebilirsiniz. Bu, uygulaman\u0131z\u0131 yeniden da\u011f\u0131tmadan parametreleri de\u011fi\u015ftirmenize olanak tan\u0131r. Ayr\u0131ca, farkl\u0131 parametrelerle A\/B testleri yaparak en uygun ayarlar\u0131 bulabilirsiniz.<\/p>\n5. Ortak K\u00fct\u00fcphaneler ve Servis Mesh Kullan\u0131m\u0131<\/h3>\n
E\u011fer \u00e7ok say\u0131da sunucusuz fonksiyonunuz varsa, Circuit Breaker mant\u0131\u011f\u0131n\u0131 her fonksiyona ayr\u0131 ayr\u0131 kopyalamak yerine, ortak bir katman veya k\u00fct\u00fcphane olu\u015fturarak payla\u015f\u0131n. Daha b\u00fcy\u00fck mikroservis mimarilerinde, Istio, Linkerd gibi \"Service Mesh\" \u00e7\u00f6z\u00fcmleri, Circuit Breaker, retry, timeout gibi desenleri uygulama katman\u0131ndan ay\u0131rarak trafik y\u00f6netimi katman\u0131na ta\u015f\u0131r ve daha merkezi bir y\u00f6netim sunar.<\/p>\n
Bu ileri d\u00fczey teknikler, Circuit Breaker desenini uygulaman\u0131zda sadece bir hata y\u00f6netimi arac\u0131 olmaktan \u00e7\u0131kar\u0131p, onu proaktif bir dayan\u0131kl\u0131l\u0131k ve operasyonel m\u00fckemmellik stratejisinin merkezine oturtman\u0131za yard\u0131mc\u0131 olacakt\u0131r. Sisteminizin her zaman esnek, h\u0131zl\u0131 ve g\u00fcvenilir kalmas\u0131n\u0131 sa\u011flamak i\u00e7in bu ipu\u00e7lar\u0131n\u0131 g\u00f6z \u00f6n\u00fcnde bulundurun.<\/p>\n
Mobil Uyumlu Tasar\u0131m \u0130\u00e7in \u0130pu\u00e7lar\u0131 ve HTML Yap\u0131s\u0131<\/h2>\n
Bu makalenin kendisi web \u00fczerinde yay\u0131nlanaca\u011f\u0131 i\u00e7in, i\u00e7eri\u011fin mobil cihazlarda da sorunsuz bir \u015fekilde okunabilir olmas\u0131 \u00f6nemlidir. Mobil uyumlu (responsive) bir HTML yap\u0131s\u0131 olu\u015fturmak, kullan\u0131c\u0131 deneyimini do\u011frudan etkiler. \u0130\u015fte makalenin temel HTML yap\u0131s\u0131n\u0131n mobil uyumlu hale getirilmesi i\u00e7in baz\u0131 ipu\u00e7lar\u0131 ve \u00f6rnekler:<\/p>\n
1. Meta Viewport Etiketi Kullan\u0131m\u0131<\/h3>\n
Herhangi bir mobil uyumlu web sayfas\u0131n\u0131n olmazsa olmaz\u0131 <\/code> etiketidir. Bu etiket, taray\u0131c\u0131ya sayfan\u0131n cihaz geni\u015fli\u011fine uygun olarak \u00f6l\u00e7eklenmesi gerekti\u011fini bildirir.<\/p>\n\n\n <\/pre>\n<\/code><\/p>\n
Bu, i\u00e7eri\u011fin mobil cihazlarda yatay kayd\u0131rma olmadan tam olarak g\u00f6r\u00fcnt\u00fclenmesini sa\u011flar.<\/p>\n
2. Ak\u0131\u015fkan Izgaralar (Fluid Grids) ve Esnek G\u00f6rseller<\/h3>\n
T\u00fcm layout elemanlar\u0131 ve g\u00f6rseller i\u00e7in piksel tabanl\u0131 sabit geni\u015flikler yerine y\u00fczdelik de\u011ferler veya max-width: 100%<\/code> gibi \u00f6zellikler kullanmak, i\u00e7eri\u011fin farkl\u0131 ekran boyutlar\u0131na uyum sa\u011flamas\u0131na yard\u0131mc\u0131 olur.<\/p>\n\n\/* Genel d\u00fczen i\u00e7in *\/\n.container {\n width: 90%; \/* %90 geni\u015flik *\/\n max-width: 1200px; \/* Maksimum geni\u015flik s\u0131n\u0131r\u0131 *\/\n margin: 0 auto; \/* Ortala *\/\n}\n\n\/* G\u00f6rseller i\u00e7in *\/\nimg {\n max-width: 100%; \/* Kapsay\u0131c\u0131s\u0131n\u0131n geni\u015fli\u011fini a\u015fmamas\u0131n\u0131 sa\u011flar *\/\n height: auto; \/* Oranlar\u0131 korur *\/\n display: block; \/* Fazla bo\u015fluklar\u0131 engeller *\/\n}\n <\/pre>\n<\/code><\/p>\n
3. Medya Sorgular\u0131 (Media Queries) ile \u00d6zelle\u015ftirme<\/h3>\n
Belirli ekran boyutlar\u0131 i\u00e7in farkl\u0131 stiller uygulamak \u00fczere medya sorgular\u0131 kullan\u0131l\u0131r. \u00d6rne\u011fin, mobil cihazlarda farkl\u0131 yaz\u0131 tipi boyutlar\u0131 veya s\u00fctun d\u00fczenleri uygulayabilirsiniz.<\/p>\n
\n\/* Varsay\u0131lan stil (genellikle mobil i\u00e7in) *\/\nbody {\n font-size: 16px;\n line-height: 1.6;\n}\n\nh2 {\n font-size: 24px;\n}\n\n\/* 768px ve \u00fczeri ekranlar i\u00e7in (tablet ve \u00fczeri) *\/\n@media screen and (min-width: 768px) {\n body {\n font-size: 18px;\n }\n\n h2 {\n font-size: 32px;\n }\n\n .expert-tip {\n padding: 20px 30px;\n margin: 20px 0;\n background-color: #e0f7fa;\n border-left: 5px solid #00bcd4;\n font-style: italic;\n }\n}\n\n\/* 1200px ve \u00fczeri ekranlar i\u00e7in (masa\u00fcst\u00fc) *\/\n@media screen and (min-width: 1200px) {\n body {\n font-size: 17px;\n }\n\n h2 {\n font-size: 36px;\n }\n}\n <\/pre>\n<\/code><\/p>\n
Yukar\u0131daki CSS \u00f6rneklerinde, farkl\u0131 ekran boyutlar\u0131na g\u00f6re yaz\u0131 tiplerinin ve di\u011fer elemanlar\u0131n nas\u0131l de\u011fi\u015febilece\u011fi g\u00f6sterilmi\u015ftir. .expert-tip<\/code> gibi \u00f6zel HTML elemanlar\u0131n\u0131z varsa, bunlar\u0131 da medya sorgular\u0131 i\u00e7inde yeniden stilize edebilirsiniz.<\/p>\n4. Okunabilirlik \u0130\u00e7in Basit ve Temiz HTML Yap\u0131s\u0131<\/h3>\n
Makalenin temel HTML yap\u0131s\u0131n\u0131n temiz ve anlamsal olmas\u0131, hem SEO hem de mobil uyumluluk a\u00e7\u0131s\u0131ndan \u00f6nemlidir. Ba\u015fl\u0131klar (<\/p>\n<\/code>, <\/p>\n<\/code>), paragraflar (<\/p>\n<\/code>), listeler (<\/p>\n<\/code>, <\/p>\n<\/code>) ve kod bloklar\u0131 (<\/p>\n<\/code>) gibi etiketleri do\u011fru kullanmak, taray\u0131c\u0131lar\u0131n i\u00e7eri\u011fi do\u011fru bir \u015fekilde yorumlamas\u0131n\u0131 sa\u011flar.<\/p>\n \n\nBu Bir Alt Ba\u015fl\u0131k<\/h2>\nBu Bir Di\u011fer Alt Ba\u015fl\u0131k<\/h3>\n\n\n
Bu makaledeki metinleri i\u00e7eren bir paragraft\u0131r. Mobil cihazlarda rahat okunabilmesi i\u00e7in k\u0131sa ve net olmal\u0131d\u0131r.<\/p>\n\n\n
\n - Madde 1<\/li>\n
- Madde 2<\/li>\n<\/ul>\n\n\n
\n print(\"Merhaba d\u00fcnya!\")\n<\/code><\/pre>\n<\/p>\n
\n Uzman \u0130pucu: Responsive tasar\u0131mda metin boyutlar\u0131n\u0131n ve sat\u0131r y\u00fcksekliklerinin ayarlanmas\u0131 kritik \u00f6neme sahiptir.\n<\/div>\n <\/code><\/p>\n
Bu ipu\u00e7lar\u0131, teknik makalenizin hem masa\u00fcst\u00fc hem de mobil cihazlarda profesyonel ve eri\u015filebilir olmas\u0131n\u0131 sa\u011flayacakt\u0131r. Mobil kullan\u0131c\u0131lar\u0131n say\u0131s\u0131 her ge\u00e7en g\u00fcn artt\u0131\u011f\u0131 i\u00e7in, i\u00e7eri\u011finize bu a\u00e7\u0131dan yakla\u015fmak, geni\u015f bir kitleye ula\u015fman\u0131n anahtar\u0131d\u0131r.<\/p>\n
Sonu\u00e7<\/h2>\n
Sunucusuz mimariler, \u00e7eviklik ve \u00f6l\u00e7eklenebilirlik vaat ederken, da\u011f\u0131t\u0131k sistemlerin do\u011fas\u0131ndan kaynaklanan zorluklar\u0131 da beraberinde getirir. \u00d6zellikle d\u0131\u015f servis ba\u011f\u0131ml\u0131l\u0131klar\u0131n\u0131n neden oldu\u011fu kesintiler, t\u00fcm uygulaman\u0131n performans\u0131n\u0131 ve kullan\u0131labilirli\u011fini ciddi \u015fekilde etkileyebilir. Bu makalede ele ald\u0131\u011f\u0131m\u0131z Circuit Breaker deseni, bu zorluklar\u0131n \u00fcstesinden gelmek i\u00e7in g\u00fc\u00e7l\u00fc ve kan\u0131tlanm\u0131\u015f bir \u00e7\u00f6z\u00fcmd\u00fcr.<\/p>\n
Circuit Breaker'\u0131n \"Closed\", \"Open\" ve \"Half-Open\" durumlar\u0131 sayesinde, bir servis ar\u0131zal\u0131 oldu\u011funda gereksiz \u00e7a\u011fr\u0131lar\u0131n \u00f6n\u00fcne ge\u00e7ilir, ar\u0131zal\u0131 servise toparlanma s\u00fcresi tan\u0131n\u0131r ve \u00e7a\u011flayan hatalar\u0131n\u0131n yay\u0131lmas\u0131 engellenir. AWS Lambda ve Python ile g\u00f6sterdi\u011fimiz uygulamal\u0131 \u00f6rnek, bu desenin sunucusuz i\u015f y\u00fcklerinde nas\u0131l basit\u00e7e entegre edilebilece\u011fini g\u00f6zler \u00f6n\u00fcne sermi\u015ftir. Ayr\u0131ca, bir e-ticaret uygulamas\u0131ndaki ger\u00e7ek d\u00fcnya senaryosu, Circuit Breaker'\u0131n i\u015f s\u00fcreklili\u011fi ve m\u00fc\u015fteri memnuniyeti \u00fczerindeki somut etkilerini ortaya koymu\u015ftur.<\/p>\n
\u0130leri d\u00fczey optimizasyonlar ve ipu\u00e7lar\u0131 b\u00f6l\u00fcm\u00fcnde bahsedilen timeout, retry, fallback mekanizmalar\u0131, kapsaml\u0131 izleme ve dinamik yap\u0131land\u0131rma gibi teknikler, Circuit Breaker desenini uygulaman\u0131zda sadece bir hata y\u00f6netimi arac\u0131 olmaktan \u00e7\u0131kar\u0131p, onu proaktif bir dayan\u0131kl\u0131l\u0131k ve operasyonel m\u00fckemmellik stratejisinin merkezine oturtman\u0131za yard\u0131mc\u0131 olacakt\u0131r. Mobil uyumlu HTML yap\u0131s\u0131 \u00f6nerileri ise, teknik i\u00e7eri\u011finizin her cihazda eri\u015filebilir ve okunabilir olmas\u0131n\u0131 sa\u011flayarak daha geni\u015f bir kitleye ula\u015fman\u0131za olanak tan\u0131r.<\/p>\n
\u00d6zetle, Circuit Breaker deseni, modern sunucusuz uygulamalar\u0131n\u0131z\u0131 hatalara kar\u015f\u0131 daha diren\u00e7li, maliyet etkin ve g\u00fcvenilir hale getirmek i\u00e7in vazge\u00e7ilmez bir ara\u00e7t\u0131r. Bu deseni benimseyerek, uygulaman\u0131z\u0131n beklenmedik sorunlar kar\u015f\u0131s\u0131nda bile sorunsuz \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flayabilir ve kullan\u0131c\u0131lara kesintisiz bir deneyim sunabilirsiniz.<\/p>\n
S\u0131k\u00e7a Sorulan Sorular<\/h2>\n\n- Circuit Breaker deseni hangi t\u00fcr hatalar i\u00e7in en uygundur?<\/dt>\n
- Circuit Breaker deseni \u00f6zellikle da\u011f\u0131t\u0131k sistemlerdeki d\u0131\u015f servis \u00e7a\u011fr\u0131lar\u0131ndan kaynaklanan ge\u00e7ici a\u011f hatalar\u0131, zaman a\u015f\u0131mlar\u0131 ve servislerin a\u015f\u0131r\u0131 y\u00fcklenmesi gibi hatalar i\u00e7in \u00e7ok etkilidir. Uygulama i\u00e7indeki mant\u0131ksal hatalar veya veri bozulmas\u0131 gibi durumlar i\u00e7in do\u011frudan \u00e7\u00f6z\u00fcm sunmaz, ancak bu t\u00fcr hatalar\u0131 tetikleyen d\u0131\u015f fakt\u00f6rleri y\u00f6netmeye yard\u0131mc\u0131 olabilir.<\/dd>\n
- Circuit Breaker ile Retry (Yeniden Deneme) deseni aras\u0131ndaki fark nedir?<\/dt>\n
- Retry deseni, ge\u00e7ici hatalar durumunda bir i\u015flemi otomatik olarak tekrar denemeyi ama\u00e7lar. Circuit Breaker ise, ba\u015far\u0131s\u0131zl\u0131klar belirli bir e\u015fi\u011fi a\u015ft\u0131\u011f\u0131nda iste\u011fi hi\u00e7 denemeden engeller. Bu iki desen birbirini tamamlar: Circuit Breaker kapal\u0131yken (Closed) Retry kullan\u0131labilir, ancak Circuit Breaker a\u00e7\u0131kken (Open) Retry yap\u0131lmamal\u0131d\u0131r. B\u00f6ylece, gereksiz denemelerle ar\u0131zal\u0131 servis daha da k\u00f6t\u00fcle\u015ftirilmez.<\/dd>\n
- Sunucusuz bir ortamda Circuit Breaker durumunu nas\u0131l izleyebilirim?<\/dt>\n
- Circuit Breaker durumunu izlemek i\u00e7in k\u00fct\u00fcphanelerin sa\u011flad\u0131\u011f\u0131 metrikleri (\u00f6rne\u011fin,
pybreaker<\/code> k\u00fct\u00fcphanesinin olay dinleyicileri) kullanabilirsiniz. Bu metrikleri AWS CloudWatch gibi bir bulut izleme servisine g\u00f6ndererek grafikler olu\u015fturabilir ve \"Open\" duruma ge\u00e7ti\u011finde uyar\u0131lar alabilirsiniz. Ayr\u0131ca, AWS X-Ray gibi da\u011f\u0131t\u0131k izleme ara\u00e7lar\u0131 da fonksiyon \u00e7a\u011fr\u0131lar\u0131 aras\u0131ndaki Circuit Breaker etkile\u015fimlerini g\u00f6rselle\u015ftirmeye yard\u0131mc\u0131 olabilir.<\/dd>\n- Circuit Breaker'\u0131n performans \u00fczerinde herhangi bir etkisi var m\u0131d\u0131r?<\/dt>\n
- Evet, Circuit Breaker'\u0131n performansa hem olumlu hem de potansiyel olarak olumsuz etkileri olabilir. Olumlu etkisi, ar\u0131zal\u0131 bir servise yap\u0131lan gereksiz \u00e7a\u011fr\u0131lar\u0131 keserek uygulaman\u0131n zaman a\u015f\u0131m\u0131na u\u011framas\u0131n\u0131 veya kaynak israf\u0131n\u0131 \u00f6nlemesidir, bu da genel yan\u0131t s\u00fcresini iyile\u015ftirir. Olumsuz etkisi ise, her \u00e7a\u011fr\u0131da devre kesicinin durumunu kontrol etme ve ba\u015far\u0131s\u0131zl\u0131klar\u0131 kaydetme gibi k\u00fc\u00e7\u00fck bir ek y\u00fck getirmesidir. Ancak bu ek y\u00fck, genellikle sa\u011flad\u0131\u011f\u0131 dayan\u0131kl\u0131l\u0131k avantajlar\u0131na k\u0131yasla ihmal edilebilir d\u00fczeydedir.<\/dd>\n
- Farkl\u0131 sunucusuz sa\u011flay\u0131c\u0131lar (Azure, Google Cloud) i\u00e7in Circuit Breaker uygulamas\u0131 farkl\u0131l\u0131k g\u00f6sterir mi?<\/dt>\n
- Temel Circuit Breaker deseni mant\u0131\u011f\u0131 t\u00fcm sunucusuz sa\u011flay\u0131c\u0131larda ayn\u0131d\u0131r. Ancak uygulama detaylar\u0131 kullan\u0131lan dil, platformun kendine \u00f6zg\u00fc \u00f6zellikleri (\u00f6rne\u011fin, Azure Functions i\u00e7in Durable Functions, Google Cloud Functions i\u00e7in Pub\/Sub entegrasyonlar\u0131) ve entegre edilen k\u00fct\u00fcphaneler nedeniyle farkl\u0131l\u0131k g\u00f6sterebilir. Genellikle, Python i\u00e7in
pybreaker<\/code> gibi dil bazl\u0131 k\u00fct\u00fcphaneler t\u00fcm platformlarda kullan\u0131labilirken, daha karma\u015f\u0131k senaryolarda platforma \u00f6zg\u00fc ara\u00e7lar veya servis mesh \u00e7\u00f6z\u00fcmleri devreye girebilir.<\/dd>\n<\/dl>\n<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Modern sunucusuz mimarilerde uygulamalar\u0131n\u0131z\u0131n s\u00fcrekli \u00e7al\u0131\u015f\u0131r durumda kalmas\u0131n\u0131 sa\u011flamak zorlu bir g\u00f6rev olabilir. Circuit Breaker deseni, da\u011f\u0131t\u0131k sistemlerdeki…","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-34941","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\n
Circuit Breaker Deseni ile Dayan\u0131kl\u0131 Sunucusuz \u0130\u015f Y\u00fckleri Olu\u015fturma<\/title>\n<meta name=\"description\" content=\"Modern sunucusuz mimarilerde uygulamalar\u0131n\u0131z\u0131n s\u00fcrekli \u00e7al\u0131\u015f\u0131r durumda kalmas\u0131n\u0131 sa\u011flamak zorlu bir g\u00f6rev olabilir. Circuit Breaker deseni, da\u011f\u0131t\u0131k sistemlerdeki d\u0131\u015f servis ba\u011f\u0131ml\u0131l\u0131klar\u0131n\u0131n neden oldu\u011fu kesintileri en aza indirerek uygulaman\u0131z\u0131n dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 art\u0131rman\u0131n anahtar\u0131d\u0131r. Bu makale, sunucusuz i\u015f y\u00fcklerinizi daha diren\u00e7li hale getirmek i\u00e7in Circuit Breaker desenini ad\u0131m ad\u0131m nas\u0131l uygulayaca\u011f\u0131n\u0131z\u0131 ve y\u00f6netti\u011finizi detayland\u0131racakt\u0131r.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Circuit Breaker Deseni ile Dayan\u0131kl\u0131 Sunucusuz \u0130\u015f Y\u00fckleri Olu\u015fturma\" \/>\n<meta property=\"og:description\" content=\"Modern sunucusuz mimarilerde uygulamalar\u0131n\u0131z\u0131n s\u00fcrekli \u00e7al\u0131\u015f\u0131r durumda kalmas\u0131n\u0131 sa\u011flamak zorlu bir g\u00f6rev olabilir. Circuit Breaker deseni, da\u011f\u0131t\u0131k sistemlerdeki d\u0131\u015f servis ba\u011f\u0131ml\u0131l\u0131klar\u0131n\u0131n neden oldu\u011fu kesintileri en aza indirerek uygulaman\u0131z\u0131n dayan\u0131kl\u0131l\u0131\u011f\u0131n\u0131 art\u0131rman\u0131n anahtar\u0131d\u0131r. Bu makale, sunucusuz i\u015f y\u00fcklerinizi daha diren\u00e7li hale getirmek i\u00e7in Circuit Breaker desenini ad\u0131m ad\u0131m nas\u0131l uygulayaca\u011f\u0131n\u0131z\u0131 ve y\u00f6netti\u011finizi detayland\u0131racakt\u0131r.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-23T20:30:58+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"24 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"Circuit Breaker Deseni ile Dayan\u0131kl\u0131 Sunucusuz \u0130\u015f Y\u00fckleri Olu\u015fturma\",\"datePublished\":\"2025-11-23T20:30:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/\"},\"wordCount\":4189,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/circuit-breaker-deseni-ile-dayanikli-sunucusuz-is-yukleri-olusturma\/\",\"name\":\"Circuit Breaker Deseni ile Dayan\u0131kl\u0131 Sunucusuz \u0130\u015f Y\u00fckleri Olu\u015fturma\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-11-23T20:30:58+00:00\",\"description\":\"Modern sunucusuz mimarilerde uygulamalar\u0131n\u0131z\u0131n s\u00fcrekli \u00e7al\u0131\u015f\u0131r durumda kalmas\u0131n\u0131 sa\u011flamak zorlu bir g\u00f6rev olabilir. 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