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Application layer
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@@ -825,40 +825,46 @@ Benefit tambahan yang termasuk di dalamnya:
* [Panduan arsitektur HAProxy](http://www.haproxy.org/download/1.2/doc/architecture.txt)
* [Wikipedia](https://en.wikipedia.org/wiki/Reverse_proxy)
## Application layer
## Lapisan aplikasi
<p align="center">
<img src="http://i.imgur.com/yB5SYwm.png"/>
<br/>
<i><a href=http://lethain.com/introduction-to-architecting-systems-for-scale/#platform_layer>Source: Intro to architecting systems for scale</a></i>
<i><a href=http://lethain.com/introduction-to-architecting-systems-for-scale/#platform_layer>Sumber: Pengantar pengarsitekan sistem secara terskala</a></i>
</p>
Separating out the web layer from the application layer (also known as platform layer) allows you to scale and configure both layers independently. Adding a new API results in adding application servers without necessarily adding additional web servers. The **single responsibility principle** advocates for small and autonomous services that work together. Small teams with small services can plan more aggressively for rapid growth.
Pemisahan antara lapisan web dengan lapisan aplikasi (dikenal juga dengan istilah lapisan platform) memungkinkan kita untuk menyekala dan mengkonfigurasi kedua lapisan secara independen.
Penambahan API baru menghasilkan penambahan server aplikasi tanpa perlu penambahan server web.
Prinsip tanggung jawab tunggal menganjurkan untuk layanan yang kecil dan mandiri yang bekerja secara bersama.
Tim kecil dengan layanan kecil bisa merencanakan pertumbuhan yang cepat secara lebih agresif.
Workers in the application layer also help enable [asynchronism](#asynchronism).
Pekerja pada lapisan aplikasi membantu mengaktifkan [asinkronisme](#asinkronisme).
### Microservices
### Layanan mikro (Microservices)
Related to this discussion are [microservices](https://en.wikipedia.org/wiki/Microservices), which can be described as a suite of independently deployable, small, modular services. Each service runs a unique process and communicates through a well-defined, lightweight mechanism to serve a business goal. <sup><a href=https://smartbear.com/learn/api-design/what-are-microservices>1</a></sup>
Sehubungan dengan diskusi ini adalah [microservices](https://en.wikipedia.org/wiki/Microservices) dimana dapat digambarkan sebagai sekumpulan layanan yang kecil, modular, dan dapat digelar secara independen.
Setiap layanan menjalankan proses yang unik dan berkomunikasi melalui mekanisme ringan dan sudah terdefinisi dengan baik untuk melayani tujuan bisnis.<sup><a href=https://smartbear.com/learn/api-design/what-are-microservices>1</a></sup>
Pinterest, for example, could have the following microservices: user profile, follower, feed, search, photo upload, etc.
Contohnya, Pinterest bisa memiliki layanan mikro: profil pengguna, pengikut, umpan, pencarian, pengunggahan foto, dan lain.
### Service Discovery
### Penemuan layanan (Service Discovery)
Systems such as [Consul](https://www.consul.io/docs/index.html), [Etcd](https://coreos.com/etcd/docs/latest), and [Zookeeper](http://www.slideshare.net/sauravhaloi/introduction-to-apache-zookeeper) can help services find each other by keeping track of registered names, addresses, and ports. [Health checks](https://www.consul.io/intro/getting-started/checks.html) help verify service integrity and are often done using an [HTTP](#hypertext-transfer-protocol-http) endpoint. Both Consul and Etcd have a built in [key-value store](#key-value-store) that can be useful for storing config values and other shared data.
Sistem seperti [Consul](https://www.consul.io/docs/index.html), [Etcd](https://coreos.com/etcd/docs/latest), dan [Zookeeper](http://www.slideshare.net/sauravhaloi/introduction-to-apache-zookeeper) bisa membantu layanan untuk saling menemukan dengan cara melacak nama yang terdaftar, alamat, dan porta.
[Pemeriksaan kesehatan](https://www.consul.io/intro/getting-started/checks.html) membantu menguji integritas layanan dan seringkali dilakukan menggunakan titik akhir [HTTP](#hypertext-transfer-protocol-http).
Baik Consul dan Etcd keduanya memiliki [gudang tanda-nilai](#gudang-tanda-nilai) bawaan yang berguna untuk menyimpan nilai konfigurasi dan data bersama lainnya.
### Disadvantage(s): application layer
### Kekurangan: lapisan aplikasi
* Adding an application layer with loosely coupled services requires a different approach from an architectural, operations, and process viewpoint (vs a monolithic system).
* Microservices can add complexity in terms of deployments and operations.
* Penambahan lapisan aplikasi dengan layanan hubungan renggang memerlukan pendekatan yang berbeda dari sudut pandang arsitektur, operasi, dan proses dibandingkan dengan sistem monolitik.
* Layanan mikro bisa meningkatkan kompleksitas dalam aspek penggelaran dan operasi.
### Source(s) and further reading
### Sumber dan bacaan lanjutan
* [Intro to architecting systems for scale](http://lethain.com/introduction-to-architecting-systems-for-scale)
* [Crack the system design interview](http://www.puncsky.com/blog/2016-02-13-crack-the-system-design-interview)
* [Service oriented architecture](https://en.wikipedia.org/wiki/Service-oriented_architecture)
* [Introduction to Zookeeper](http://www.slideshare.net/sauravhaloi/introduction-to-apache-zookeeper)
* [Here's what you need to know about building microservices](https://cloudncode.wordpress.com/2016/07/22/msa-getting-started/)
* [Pengantar pengarsitekan sistem secara terskala](http://lethain.com/introduction-to-architecting-systems-for-scale)
* [Meretakan wawancara perancangan sistem](http://www.puncsky.com/blog/2016-02-13-crack-the-system-design-interview)
* [Arsitektur berorientasi layanan](https://en.wikipedia.org/wiki/Service-oriented_architecture)
* [Pengantar Zookeper](http://www.slideshare.net/sauravhaloi/introduction-to-apache-zookeeper)
* [Alasan kenapa kita perlu tahu mengenai pembangunan layanan mikro](https://cloudncode.wordpress.com/2016/07/22/msa-getting-started/)
## Basis data
@@ -1055,7 +1061,7 @@ NoSQL is a collection of data items represented in a **key-value store**, **docu
In addition to choosing between [SQL or NoSQL](#sql-or-nosql), it is helpful to understand which type of NoSQL database best fits your use case(s). We'll review **key-value stores**, **document stores**, **wide column stores**, and **graph databases** in the next section.
#### Key-value store
#### Gudang tanda-nilai
> Abstraction: hash table
@@ -1376,7 +1382,7 @@ Refresh-ahead can result in reduced latency vs read-through if the cache can acc
* [AWS ElastiCache strategies](http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/Strategies.html)
* [Wikipedia](https://en.wikipedia.org/wiki/Cache_(computing))
## Asynchronism
## Asinkronisme
<p align="center">
<img src="http://i.imgur.com/54GYsSx.png"/>