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gerek kalmaz",{"key":184,"text":185},"d","İki servis aynı veritabanı tablolarını güvenle okuyup yazabilir","Queue, producer'ı consumer'ın erişilebilirliğinden ve hızından ayrıştırır: producer mesajı kuyruğa bırakıp yoluna devam eder, biriken işler consumer yetiştikçe işlenir. Mesaj başına gecikme genelde azalmaz, artar (a); retry geçici hatalara yardım eder ama hata yönetimi ihtiyacını ortadan kaldırmaz (c).",{"id":188,"topic":9,"difficulty":189,"body":190,"options":191,"correct_key":181,"explanation":200},"019f56bb-b388-72aa-9c18-962f977dea3d",2,"Bir endpoint video yüklemeye izin veriyor; önizleme üretimi yaklaşık 60 saniye sürüyor. Bu iş senkron yapıldığında istekler timeout'a düşüyor. Standart çözüm nedir?",[192,194,196,198],{"key":175,"text":193},"Sunucuda ve load balancer'da HTTP timeout'u birkaç dakikaya çıkarmak",{"key":178,"text":195},"Client'ın aynı yüklemeyi başarana kadar tekrar tekrar denemesini sağlamak",{"key":181,"text":197},"Yüklemeyi kabul edip background job'ı kuyruğa atmak ve yanıtı hemen dönmek",{"key":184,"text":199},"Önizleme üretimini birden çok senkron isteğe bölmek","Uzun süren iş request\u002Fresponse döngüsüne ait değildir: girdiyi kabul et, job'ı kuyruğa at, yanıtı hemen dön (genellikle bir job referansıyla). Timeout'u artırmak (a) bağlantıları ve worker'ları meşgul tutar, sınırı sadece öteler; client retry'ı (b) kök nedeni çözmeden yükü katlar.",{"id":202,"topic":9,"difficulty":171,"body":203,"options":204,"correct_key":175,"explanation":213},"019f56bb-b389-7110-b1f8-0df58b0829d2","Producer\u002Fconsumer deseninde producer'ın rolü nedir?",[205,207,209,211],{"key":175,"text":206},"Mesajları, işlenmelerini beklemeden queue'ya yayınlar",{"key":178,"text":208},"Mesajları queue'dan alır ve tarif ettikleri işi çalıştırır",{"key":181,"text":210},"Consumer process'lerini izler ve çökenleri yeniden başlatır",{"key":184,"text":212},"İşlenen mesajların sonuçlarını saklar ve client'lara sunar","Producer yalnızca yayınlar; işlenmeyi ne bekler ne de bilir — iki tarafı ayrıştıran da tam olarak budur. (b) şıkkı consumer'ı tarif eder.",{"id":215,"topic":9,"difficulty":189,"body":216,"options":217,"correct_key":184,"explanation":226},"019f56bb-b389-7631-bd93-b9c4124d1fbc","Bir consumer şöyle yazılmış:\n```\nmsg = queue.receive()\nqueue.ack(msg)\nprocess(msg)\n```\nBu sıralamanın riski nedir?",[218,220,222,224],{"key":175,"text":219},"Ack çok erken geldiği için broker mesajı yeniden teslim eder",{"key":178,"text":221},"Alınan her mesaj için process(msg) iki kez çalışır",{"key":181,"text":223},"Consumer, bir sonraki mesajı beklerken deadlock'a girer",{"key":184,"text":225},"process(msg) başarısız olursa mesaj çoktan silinmiştir, iş kaybolur","Ack mesajı 'tamamlandı' olarak işaretler ve broker onu siler; sonrasında process(msg) içinde çökülürse yeniden teslim edilecek bir şey kalmaz — fiilen at-most-once davranışıdır. Başarısızlıkta redelivery istiyorsan ack'i işlem başarıyla bitince gönder. (a) tersinden yanlıştır: erken ack redelivery'ye yol açmaz, onu engeller.",{"id":228,"topic":9,"difficulty":189,"body":229,"options":230,"correct_key":178,"explanation":239},"019f56bb-b38a-71d4-994c-e39359d54853","Bir consumer mesajı queue'dan aldı ve ack'lemeden çöktü. Tipik bir message broker ne yapar?",[231,233,235,237],{"key":175,"text":232},"Teslimat denemesi yapıldığı için mesajı siler",{"key":178,"text":234},"Mesajı eninde sonunda yeniden teslim edilebilir hale getirir",{"key":181,"text":236},"Ne olduğu bir operatör tarafından doğrulanana kadar tüm queue'yu durdurur",{"key":184,"text":238},"Mesajı anında dead letter queue'ya taşır","Ack'lenmemiş mesajlar bir timeout sonrası ya da consumer'ın düştüğü anlaşılınca yeniden teslim edilebilir hale gelir; başka bir consumer (ya da yeniden başlayan aynı consumer) ikinci bir şans elde eder — at-least-once semantiğinin temeli bu redelivery'dir. DLQ'ya (d) taşıma genellikle ilk değil, tekrarlanan başarısız denemelerden sonra olur.",{"id":241,"topic":9,"difficulty":171,"body":242,"options":243,"correct_key":175,"explanation":252},"019f56bb-b38a-7e5b-914b-c18230ffaefe","\"At-least-once delivery\" ne anlama gelir?",[244,246,248,250],{"key":175,"text":245},"Her mesaj bir ya da daha fazla kez teslim edilir; duplicate mümkündür",{"key":178,"text":247},"Her mesaj tam olarak bir kez teslim edilir, duplicate imkânsızdır",{"key":181,"text":249},"Bazı mesajlar düşebilir ama hiçbiri iki kez teslim edilmez",{"key":184,"text":251},"Her mesaj, bağlı her consumer'a en az bir kez teslim edilir","At-least-once, hiçbir mesajın sessizce kaybolmayacağını garanti eder; bedeli ise ara sıra duplicate görülmesidir (örneğin işleme ile ack arasında çökülürse). (c) at-most-once'ı, (b) exactly-once'ı tarif eder.",{"fields":254,"seniorities":424,"interview_shapes":425,"locales":430,"oauth":432,"question_count":435,"coach_enabled":436,"jd_match_enabled":436},[255,266,286,303,327,340,359,378,398,405,411,418],{"key":5,"name_tr":6,"name_en":6,"sort":171,"specializations":256},[257,260,261,262,263,264,265],{"key":258,"name":259,"field":5},"general","Genel",{"key":154,"name":155,"field":5},{"key":166,"name":167,"field":5},{"key":157,"name":158,"field":5},{"key":150,"name":151,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":267,"name_tr":268,"name_en":268,"sort":189,"specializations":269},"frontend","Frontend",[270,271,274,277,280,283],{"key":258,"name":259,"field":267},{"key":272,"name":273,"field":267},"javascript","JavaScript",{"key":275,"name":276,"field":267},"typescript","TypeScript",{"key":278,"name":279,"field":267},"react","React",{"key":281,"name":282,"field":267},"vue","Vue",{"key":284,"name":285,"field":267},"angular","Angular",{"key":287,"name_tr":288,"name_en":288,"sort":289,"specializations":290},"fullstack","Fullstack",3,[291,292,293,294,295,296,297,298,299,300,301,302],{"key":258,"name":259,"field":287},{"key":154,"name":155,"field":5},{"key":166,"name":167,"field":5},{"key":157,"name":158,"field":5},{"key":150,"name":151,"field":5},{"key":160,"name":161,"field":5},{"key":163,"name":164,"field":5},{"key":272,"name":273,"field":267},{"key":275,"name":276,"field":267},{"key":278,"name":279,"field":267},{"key":281,"name":282,"field":267},{"key":284,"name":285,"field":267},{"key":304,"name_tr":305,"name_en":305,"sort":306,"specializations":307},"devops-cloud","DevOps \u002F Cloud",4,[308,309,312,315,318,321,324],{"key":258,"name":259,"field":304},{"key":310,"name":311,"field":304},"aws","AWS",{"key":313,"name":314,"field":304},"gcp","GCP",{"key":316,"name":317,"field":304},"azure","Azure",{"key":319,"name":320,"field":304},"kubernetes","Kubernetes",{"key":322,"name":323,"field":304},"terraform","Terraform",{"key":325,"name":326,"field":304},"linux","Linux",{"key":328,"name_tr":329,"name_en":329,"sort":330,"specializations":331},"ai-engineer","AI Engineer",5,[332,333,334,337],{"key":258,"name":259,"field":328},{"key":166,"name":167,"field":328},{"key":335,"name":336,"field":328},"llm-rag","LLM\u002FRAG",{"key":338,"name":339,"field":328},"mlops","MLOps",{"key":341,"name_tr":342,"name_en":343,"sort":344,"specializations":345},"database","Veritabanı","Database",6,[346,347,350,353,356],{"key":258,"name":259,"field":341},{"key":348,"name":349,"field":341},"postgresql","PostgreSQL",{"key":351,"name":352,"field":341},"mysql","MySQL",{"key":354,"name":355,"field":341},"mongodb","MongoDB",{"key":357,"name":358,"field":341},"redis","Redis",{"key":360,"name_tr":361,"name_en":362,"sort":363,"specializations":364},"mobile","Mobil","Mobile",7,[365,366,369,372,375],{"key":258,"name":259,"field":360},{"key":367,"name":368,"field":360},"ios-swift","iOS (Swift)",{"key":370,"name":371,"field":360},"android-kotlin","Android (Kotlin)",{"key":373,"name":374,"field":360},"flutter","Flutter",{"key":376,"name":377,"field":360},"react-native","React Native",{"key":143,"name_tr":144,"name_en":379,"sort":380,"specializations":381},"Security",8,[382,383,386,389,392,395],{"key":258,"name":259,"field":143},{"key":384,"name":385,"field":143},"appsec","AppSec",{"key":387,"name":388,"field":143},"offensive-pentest","Offensive \u002F Pentest",{"key":390,"name":391,"field":143},"cloud-security","Cloud Security",{"key":393,"name":394,"field":143},"devsecops","DevSecOps",{"key":396,"name":397,"field":143},"blue-team-incident","Blue Team \u002F Incident",{"key":399,"name_tr":400,"name_en":401,"sort":402,"specializations":403},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[404],{"key":258,"name":259,"field":399},{"key":406,"name_tr":407,"name_en":407,"sort":408,"specializations":409},"data-engineer","Data Engineer",10,[410],{"key":258,"name":259,"field":406},{"key":412,"name_tr":413,"name_en":414,"sort":415,"specializations":416},"game-dev","Oyun Geliştirme","Game Development",11,[417],{"key":258,"name":259,"field":412},{"key":419,"name_tr":420,"name_en":420,"sort":421,"specializations":422},"ml-engineer","ML Engineer",12,[423],{"key":258,"name":259,"field":419},[14,15,16],{"junior":426,"mid":428,"senior":429},{"questions":427,"median_sec":3},20,{"questions":427,"median_sec":3},{"questions":427,"median_sec":3},[10,431],"en",[433,434],"google","github",21750,true]