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Asenkron Hayat

İbrahim Gündüz
Şubat 2014
İbrahim Gündüz
Yazılım Geliştirici

http://tr.linkedin.com/in/ibrahimgunduz
https://github.com/ibrahimgunduz34
https://twitter.com/ibrahimgunduz34
ibrahimgunduz34@gmail.com
http://www.ibrahimgunduz.net/
Neden yük artar ?

Yük artarsa ne olur ?
Neden yük artar ?

● Göz önünde olmak
● Arama motorlarında bulunabilir olmak
● Farklı kanallardan yönlendirme trafiği
almak
● Reklam vermek
Yük artarsa ne olur ?
● Sunucuya gelen anlık
istek sayısı artar
● Veritabanı üzerinde
çalışan eşzamanlı sorgu
sayısı artar
● Sunucular üzerinde
bellek, işlemci ve disk
G/Ç benzeri kaynakların
kullanımı artar.
● Yanıt süreleri uzar
Ya sonra...
Ne yapmalı ?!??
Dikey Ölçekleme
Dikey Ölçekleme:
Dikey ölçekleme, mevcut sistemlerin cpu,
bellek ve disk gibi kaynaklarını arttırmak
suretiyle gerçekleştirilir.

●
●

●
●

Günü kurtarır.
Genişleme, mevcut sistemin ve günün
teknolojisinin getirdiği limitlerle
sınırlıdır.
Maliyetlidir.
Cihaz hasar gördüğünde sorumlu
olduğu servisin tamamen durmasına
neden olabilir.
Yatay Ölçekleme
●
●
●
●

Daha fazla eş zamanlı isteğe yanıt
verebilir.
Dikey ölçeklenmiş bir sisteme göre
daha sürdürülebilir.
İhtiyaç oldukça yeni düğümler
ekleyerek yük dağıtılabilir.
Ağdaki düğümlerden herhangibiri
servis dışı kaldığında sistem kesintisiz
olarak çalışmaya devam edebilir.
Ölçekleme ve Sürdürülebilirlik
ÖLÇEKLENEBİLİRLİK != PERFORMANS
Optimizasyon
●
●
●
●
●
●

Gelen isteklerin maliyet analizini
çıkartın, darboğazları tespit edin.
Yavaş çalışan veritabanı sorgularını
tespit edin ve optimize edin.
Sık sorgulanan verileri redis veya
memcahe ile hafızada tutun.
Dinamik veri içermeyen, sık değişim
göstermeyen içerikleri hafızaya alın.
APC gibi hızlandırıcılardan yararlanın.
Defansif geliştirme yapın ve hatalardan
haberdar olun.
Peki ya 3. Parti Bağımlılıkları ??
Erpye Veri
Aktarımı
Diğer Uygulamalara
Gönderilen API
İstekleri
Transactional
SMTP İstekleri

Veri Senkronizasyon
işleri
Bildirim
Servisleri
Neden Asenkron Çalışmalı ?

Sürdürülebilir sistem mimarisi sağlamak.
Asenkron Yapılar Nasıl Çalışırlar ?

Asenkron sistemler, uygulamadan gönderilen mesajların
kuyruklanarak başka bir tarafından kuyruktaki mesajların
dinlenmesi ve sırayla işlenmesi şeklinde çalışırlar.
Hangi Araçları Kullanmalı ?
Gerçek Hayattan
Kullanım Alanları
Bildirim İletilerinin Gönderimi

Üye kaydı veya sipariş onayı gibi durumlarda
kullanıcılara elektronik posta veya SMS
bildirimlerinin gönderilmesi
Veri
Senkronizasyonu

Önyüzde geçici olarak gösterilen işlenmiş
veriler veya arama verilerinin veritabanıyla
senkronize edilmesi
Ayrık Sistemler Arasında
Haberleşme

Elektronik ticaret uygulamasından alınan
siparişin ERP sistemine yansıtılması.
Sorular ??
Teşekkürler :)
http://tr.linkedin.com/in/ibrahimgunduz
https://github.com/ibrahimgunduz34
https://twitter.com/ibrahimgunduz34
ibrahimgunduz34@gmail.com
http://www.ibrahimgunduz.net/

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