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12
README-ja.md
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@ -544,7 +544,7 @@ DNSは少数のオーソライズされたサーバーが上位に位置する
* **A record (address)** - IPアドレスに名前をつけます。
* **CNAME (canonical)** - 他の名前もしくは　`CNAME` (example.com を www.example.com) もしくは `A` recordへと名前を指し示す。
[CloudFlare](https://www.cloudflare.com/dns/) や [Route 53](https://aws.amazon.com/route53/) などのサービスはマネージドDNSサービスを提供しています。いくつかのDNSサービスでは様々な手法を使ってトラフィックを捌くことができます:
[Cloudflare](https://www.cloudflare.com/dns/) や [Route 53](https://aws.amazon.com/route53/) などのサービスはマネージドDNSサービスを提供しています。いくつかのDNSサービスでは様々な手法を使ってトラフィックを捌くことができます:
* [加重ラウンドロビン](http://g33kinfo.com/info/archives/2657)
* トラフィックがメンテナンス中のサーバーに行くのを防ぎます
@ -999,7 +999,7 @@ NoSQL は **key-value store**、 **document-store**、 **wide column store**、
ワイドカラムストアのデータの基本単位はカラム（ネーム・バリューのペア）です。それぞれのカラムはカラムファミリーとして（SQLテーブルのように）グループ化することができます。スーパーカラムファミリーはカラムファミリーの集合です。それぞれのカラムには行キーでアクセスすることができます。同じ行キーを持つカラムは同じ行として認識されます。それぞれの値は、バージョン管理とコンフリクトが起きた時のために、タイムスタンプを含みます。
Googleは[Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)を初のワイドカラムストアとして発表しました。それがオープンソースでHadoopなどでよく使われる[HBase](https://www.mapr.com/blog/in-depth-look-hbase-architecture) やFacebookによる[Cassandra](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html) などのプロジェクトに影響を与えました。BigTable、HBaseやCassandraなどのストアはキーを辞書形式で保持することで選択したキーレンジでのデータ取得を効率的にします。
Googleは[Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)を初のワイドカラムストアとして発表しました。それがオープンソースでHadoopなどでよく使われる[HBase](https://www.edureka.co/blog/hbase-architecture/) やFacebookによる[Cassandra](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html) などのプロジェクトに影響を与えました。Bigtable、HBaseやCassandraなどのストアはキーを辞書形式で保持することで選択したキーレンジでのデータ取得を効率的にします。
ワイドカラムストアは高い可用性とスケーラビリティを担保します。これらはとても大規模なデータセットを扱うことによく使われます。
@ -1007,7 +1007,7 @@ Googleは[Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/cha
* [SQL & NoSQL簡単に歴史をさらう](http://blog.grio.com/2015/11/sql-nosql-a-brief-history.html)
* [Bigtable アーキテクチャ](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)
* [HBase アーキテクチャ](https://www.mapr.com/blog/in-depth-look-hbase-architecture)
* [HBase アーキテクチャ](https://www.edureka.co/blog/hbase-architecture/)
* [Cassandra アーキテクチャ](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)
#### グラフデータベース
@ -1615,7 +1615,7 @@ Notes
| Facebookタイムラインの設計 | [facebook.com](https://www.facebook.com/note.php?note_id=10150468255628920)<br/>[highscalability.com](http://highscalability.com/blog/2012/1/23/facebook-timeline-brought-to-you-by-the-power-of-denormaliza.html) |
| Facebookチャットの設計 | [erlang-factory.com](http://www.erlang-factory.com/upload/presentations/31/EugeneLetuchy-ErlangatFacebook.pdf)<br/>[facebook.com](https://www.facebook.com/note.php?note_id=14218138919&id=9445547199&index=0) |
| Facebookのようなgraph検索の設計 | [facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-building-out-the-infrastructure-for-graph-search/10151347573598920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-indexing-and-ranking-in-graph-search/10151361720763920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-the-natural-language-interface-of-graph-search/10151432733048920) |
| CloudFlareのようなCDNの設計 | [cmu.edu](http://repository.cmu.edu/cgi/viewcontent.cgi?article=2112&context=compsci) |
| CloudflareのようなCDNの設計 | [cmu.edu](http://repository.cmu.edu/cgi/viewcontent.cgi?article=2112&context=compsci) |
| Twitterのトレンド機能の設計 | [michael-noll.com](http://www.michael-noll.com/blog/2013/01/18/implementing-real-time-trending-topics-in-storm/)<br/>[snikolov .wordpress.com](http://snikolov.wordpress.com/2012/11/14/early-detection-of-twitter-trends/) |
| ランダムID発行システムの設計 | [blog.twitter.com](https://blog.twitter.com/2010/announcing-snowflake)<br/>[github.com](https://github.com/twitter/snowflake/) |
| 一定のインターバル時間での上位k件を返す | [ucsb.edu](https://icmi.cs.ucsb.edu/research/tech_reports/reports/2005-23.pdf)<br/>[wpi.edu](http://davis.wpi.edu/xmdv/docs/EDBT11-diyang.pdf) |
@ -1716,7 +1716,7 @@ Notes
* [Google Research Blog](http://googleresearch.blogspot.com/)
* [Groupon Engineering Blog](https://engineering.groupon.com/)
* [Heroku Engineering Blog](https://engineering.heroku.com/)
* [Hubspot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [HubSpot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [High Scalability](http://highscalability.com/)
* [Instagram Engineering](http://instagram-engineering.tumblr.com/)
* [Intel Software Blog](https://software.intel.com/en-us/blogs/)
@ -1725,7 +1725,7 @@ Notes
* [Microsoft Engineering](https://engineering.microsoft.com/)
* [Microsoft Python Engineering](https://blogs.msdn.microsoft.com/pythonengineering/)
* [Netflix Tech Blog](http://techblog.netflix.com/)
* [Paypal Developer Blog](https://devblog.paypal.com/category/engineering/)
* [PayPal Developer Blog](https://devblog.paypal.com/category/engineering/)
* [Pinterest Engineering Blog](http://engineering.pinterest.com/)
* [Quora Engineering](https://engineering.quora.com/)
* [Reddit Blog](http://www.redditblog.com/)

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@ -550,7 +550,7 @@ DNS 和 email 等系统使用的是此种方式。最终一致性在高可用性
* **A 记录（地址）** ─ 指定域名对应的 IP 地址记录。
* **CNAME（规范）** ─ 一个域名映射到另一个域名或 `CNAME` 记录（ example.com 指向 www.example.com ）或映射到一个 `A` 记录。
[CloudFlare](https://www.cloudflare.com/dns/) 和 [Route 53](https://aws.amazon.com/route53/) 等平台提供管理 DNS 的功能。某些 DNS 服务通过集中方式来路由流量:
[Cloudflare](https://www.cloudflare.com/dns/) 和 [Route 53](https://aws.amazon.com/route53/) 等平台提供管理 DNS 的功能。某些 DNS 服务通过集中方式来路由流量:
* [加权轮询调度](http://g33kinfo.com/info/archives/2657)
* 防止流量进入维护中的服务器
@ -1010,15 +1010,15 @@ MongoDB 和 CouchDB 等一些文档类型存储还提供了类似 SQL 语言的
类型存储的基本数据单元是列（名／值对）。列可以在列族（类似于 SQL 的数据表）中被分组。超级列族再分组普通列族。你可以使用行键独立访问每一列，具有相同行键值的列组成一行。每个值都包含版本的时间戳用于解决版本冲突。
Google 发布了第一个列型存储数据库 [Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)，它影响了 Hadoop 生态系统中活跃的开源数据库 [HBase](https://www.mapr.com/blog/in-depth-look-hbase-architecture) 和 Facebook 的 [Cassandra](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)。像 BigTable，HBase 和 Cassandra 这样的存储系统将键以字母顺序存储，可以高效地读取键列。
Google 发布了第一个列型存储数据库 [Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)，它影响了 Hadoop 生态系统中活跃的开源数据库 [HBase](https://www.edureka.co/blog/hbase-architecture/) 和 Facebook 的 [Cassandra](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)。像 Bigtable，HBase 和 Cassandra 这样的存储系统将键以字母顺序存储，可以高效地读取键列。
列型存储具备高可用性和高可扩展性。通常被用于大数据相关存储。
##### 来源及延伸阅读：列型存储
- [SQL 与 NoSQL 简史](http://blog.grio.com/2015/11/sql-nosql-a-brief-history.html)
- [BigTable 架构](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)
- [Hbase 架构](https://www.mapr.com/blog/in-depth-look-hbase-architecture)
- [Bigtable 架构](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)
- [HBase 架构](https://www.edureka.co/blog/hbase-architecture/)
- [Cassandra 架构](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)
#### 图数据库
@ -1626,7 +1626,7 @@ Notes
| 设计 Facebook 的时间线系统 | [facebook.com](https://www.facebook.com/note.php?note_id=10150468255628920)<br/>[highscalability.com](http://highscalability.com/blog/2012/1/23/facebook-timeline-brought-to-you-by-the-power-of-denormaliza.html) |
| 设计 Facebook 的聊天系统 | [erlang-factory.com](http://www.erlang-factory.com/upload/presentations/31/EugeneLetuchy-ErlangatFacebook.pdf)<br/>[facebook.com](https://www.facebook.com/note.php?note_id=14218138919&id=9445547199&index=0) |
| 设计类似 Facebook 的图表搜索系统 | [facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-building-out-the-infrastructure-for-graph-search/10151347573598920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-indexing-and-ranking-in-graph-search/10151361720763920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-the-natural-language-interface-of-graph-search/10151432733048920) |
| 设计类似 CloudFlare 的内容传递网络 | [cmu.edu](http://repository.cmu.edu/cgi/viewcontent.cgi?article=2112&context=compsci) |
| 设计类似 Cloudflare 的内容传递网络 | [cmu.edu](http://repository.cmu.edu/cgi/viewcontent.cgi?article=2112&context=compsci) |
| 设计类似 Twitter 的热门话题系统 | [michael-noll.com](http://www.michael-noll.com/blog/2013/01/18/implementing-real-time-trending-topics-in-storm/)<br/>[snikolov .wordpress.com](http://snikolov.wordpress.com/2012/11/14/early-detection-of-twitter-trends/) |
| 设计一个随机 ID 生成系统 | [blog.twitter.com](https://blog.twitter.com/2010/announcing-snowflake)<br/>[github.com](https://github.com/twitter/snowflake/) |
| 返回一定时间段内次数前 k 高的请求 | [ucsb.edu](https://icmi.cs.ucsb.edu/research/tech_reports/reports/2005-23.pdf)<br/>[wpi.edu](http://davis.wpi.edu/xmdv/docs/EDBT11-diyang.pdf) |
@ -1727,7 +1727,7 @@ Notes
* [Google Research Blog](http://googleresearch.blogspot.com/)
* [Groupon Engineering Blog](https://engineering.groupon.com/)
* [Heroku Engineering Blog](https://engineering.heroku.com/)
* [Hubspot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [HubSpot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [High Scalability](http://highscalability.com/)
* [Instagram Engineering](http://instagram-engineering.tumblr.com/)
* [Intel Software Blog](https://software.intel.com/en-us/blogs/)
@ -1736,7 +1736,7 @@ Notes
* [Microsoft Engineering](https://engineering.microsoft.com/)
* [Microsoft Python Engineering](https://blogs.msdn.microsoft.com/pythonengineering/)
* [Netflix Tech Blog](http://techblog.netflix.com/)
* [Paypal Developer Blog](https://devblog.paypal.com/category/engineering/)
* [PayPal Developer Blog](https://devblog.paypal.com/category/engineering/)
* [Pinterest Engineering Blog](http://engineering.pinterest.com/)
* [Quora Engineering](https://engineering.quora.com/)
* [Reddit Blog](http://www.redditblog.com/)

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@ -543,7 +543,7 @@ DNS 是階層式的架構，一部分的 DNS 伺服器位於頂層，當查詢
* **A 記錄 (地址)** - 指向要對應的 IP 位置。
* **CNAME (別名)** - 從一個域名指向另外一個域名，或是 `CNAME` (example.com 指向 www.example.com) 或指向一個 `A` 記錄。
[CloudFlare](https://www.cloudflare.com/dns/) 和 [Route 53](https://aws.amazon.com/route53/) 提供了 DNS 的服務。而這些 DNS 服務商透過以下幾種方式來決定流量如何被分派：
[Cloudflare](https://www.cloudflare.com/dns/) 和 [Route 53](https://aws.amazon.com/route53/) 提供了 DNS 的服務。而這些 DNS 服務商透過以下幾種方式來決定流量如何被分派：
* [加權輪詢](http://g33kinfo.com/info/archives/2657)
* 防止流量進入正在維修中的伺服器
@ -1000,7 +1000,7 @@ NoSQL 指的是 **鍵-值對的資料庫**、**文件類型資料庫**、**列
列儲存型資料庫的基本單元是一列 (名稱/值為一組)。每一列可以被分到一個列的族群中(類似於 SQL 中的資料表)。而每個列族群之上還可以有一個超級列群。你可以透過列的鍵值來存取每一列，每個值都有一個時間戳記來解決版本問題。
Google 發表了第一個列儲存型資料庫 [Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)，這影響了用於 Hadoop 系統中開源的 [HBase](https://www.mapr.com/blog/in-depth-look-hbase-architecture) often-used in the Hadoop ecosystem, 和 Facebook 的 [Cassandra](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)。這些資料庫的儲存系統把鍵值利用字母順序來儲存，可以有效率的來讀取。
Google 發表了第一個列儲存型資料庫 [Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)，這影響了用於 Hadoop 系統中開源的 [HBase](https://www.edureka.co/blog/hbase-architecture/) often-used in the Hadoop ecosystem, 和 Facebook 的 [Cassandra](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)。這些資料庫的儲存系統把鍵值利用字母順序來儲存，可以有效率的來讀取。
列儲存型態的資料的提供了高可用和高擴展性，通常被用在大量資料的儲存上。
@ -1008,7 +1008,7 @@ Google 發表了第一個列儲存型資料庫 [Bigtable](http://www.read.seas.h
* [SQL 和 NoSQL 歷史簡介](http://blog.grio.com/2015/11/sql-nosql-a-brief-history.html)
* [Bigtable 架構](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf)
* [HBase 架構](https://www.mapr.com/blog/in-depth-look-hbase-architecture)
* [HBase 架構](https://www.edureka.co/blog/hbase-architecture/)
* [Cassandra 架構](http://docs.datastax.com/en/archived/cassandra/2.0/cassandra/architecture/architectureIntro_c.html)
#### 圖形資料庫
@ -1616,7 +1616,7 @@ Notes
| 設計一個 Facebook 時間軸功能 | [facebook.com](https://www.facebook.com/note.php?note_id=10150468255628920)<br/>[highscalability.com](http://highscalability.com/blog/2012/1/23/facebook-timeline-brought-to-you-by-the-power-of-denormaliza.html) |
| 設計 Facebook 的聊天功能 | [erlang-factory.com](http://www.erlang-factory.com/upload/presentations/31/EugeneLetuchy-ErlangatFacebook.pdf)<br/>[facebook.com](https://www.facebook.com/note.php?note_id=14218138919&id=9445547199&index=0) |
| 設計一個像 Facebook 的圖形化搜尋系統 | [facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-building-out-the-infrastructure-for-graph-search/10151347573598920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-indexing-and-ranking-in-graph-search/10151361720763920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-the-natural-language-interface-of-graph-search/10151432733048920) |
| 設計一個像 CloudFlare 的內容傳輸網路 | [cmu.edu](http://repository.cmu.edu/cgi/viewcontent.cgi?article=2112&context=compsci) |
| 設計一個像 Cloudflare 的內容傳輸網路 | [cmu.edu](http://repository.cmu.edu/cgi/viewcontent.cgi?article=2112&context=compsci) |
| 設計一個像 Twitter 的微網誌服務 | [michael-noll.com](http://www.michael-noll.com/blog/2013/01/18/implementing-real-time-trending-topics-in-storm/)<br/>[snikolov .wordpress.com](http://snikolov.wordpress.com/2012/11/14/early-detection-of-twitter-trends/) |
| 設計一個隨機 ID 生成系統 | [blog.twitter.com](https://blog.twitter.com/2010/announcing-snowflake)<br/>[github.com](https://github.com/twitter/snowflake/) |
| 給定一段時間，回傳次數排名前 K 的請求 | [ucsb.edu](https://icmi.cs.ucsb.edu/research/tech_reports/reports/2005-23.pdf)<br/>[wpi.edu](http://davis.wpi.edu/xmdv/docs/EDBT11-diyang.pdf) |
@ -1717,7 +1717,7 @@ Notes
* [Google Research Blog](http://googleresearch.blogspot.com/)
* [Groupon Engineering Blog](https://engineering.groupon.com/)
* [Heroku Engineering Blog](https://engineering.heroku.com/)
* [Hubspot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [HubSpot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [High Scalability](http://highscalability.com/)
* [Instagram Engineering](http://instagram-engineering.tumblr.com/)
* [Intel Software Blog](https://software.intel.com/en-us/blogs/)
@ -1726,7 +1726,7 @@ Notes
* [Microsoft Engineering](https://engineering.microsoft.com/)
* [Microsoft Python Engineering](https://blogs.msdn.microsoft.com/pythonengineering/)
* [Netflix Tech Blog](http://techblog.netflix.com/)
* [Paypal Developer Blog](https://devblog.paypal.com/category/engineering/)
* [PayPal Developer Blog](https://devblog.paypal.com/category/engineering/)
* [Pinterest Engineering Blog](http://engineering.pinterest.com/)
* [Quora Engineering](https://engineering.quora.com/)
* [Reddit Blog](http://www.redditblog.com/)

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@ -595,7 +595,7 @@ DNS is hierarchical, with a few authoritative servers at the top level. Your ro
* **A record (address)** - Points a name to an IP address.
* **CNAME (canonical)** - Points a name to another name or `CNAME` (example.com to www.example.com) or to an `A` record.
Services such as [CloudFlare](https://www.cloudflare.com/dns/) and [Route 53](https://aws.amazon.com/route53/) provide managed DNS services. Some DNS services can route traffic through various methods:
Services such as [Cloudflare](https://www.cloudflare.com/dns/) and [Route 53](https://aws.amazon.com/route53/) provide managed DNS services. Some DNS services can route traffic through various methods:
* [Weighted round robin](https://www.jscape.com/blog/load-balancing-algorithms)
* Prevent traffic from going to servers under maintenance
@ -1048,7 +1048,7 @@ Document stores provide high flexibility and are often used for working with occ
A wide column store's basic unit of data is a column (name/value pair). A column can be grouped in column families (analogous to a SQL table). Super column families further group column families. You can access each column independently with a row key, and columns with the same row key form a row. Each value contains a timestamp for versioning and for conflict resolution.
Google introduced [Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf) as the first wide column store, which influenced the open-source [HBase](https://www.edureka.co/blog/hbase-architecture/) often-used in the Hadoop ecosystem, and [Cassandra](http://docs.datastax.com/en/cassandra/3.0/cassandra/architecture/archIntro.html) from Facebook. Stores such as BigTable, HBase, and Cassandra maintain keys in lexicographic order, allowing efficient retrieval of selective key ranges.
Google introduced [Bigtable](http://www.read.seas.harvard.edu/~kohler/class/cs239-w08/chang06bigtable.pdf) as the first wide column store, which influenced the open-source [HBase](https://www.edureka.co/blog/hbase-architecture/) often-used in the Hadoop ecosystem, and [Cassandra](http://docs.datastax.com/en/cassandra/3.0/cassandra/architecture/archIntro.html) from Facebook. Stores such as Bigtable, HBase, and Cassandra maintain keys in lexicographic order, allowing efficient retrieval of selective key ranges.
Wide column stores offer high availability and high scalability. They are often used for very large data sets.
@ -1384,8 +1384,8 @@ A basic HTTP request consists of a verb (method) and a resource (endpoint). Bel
| Verb | Description | Idempotent* | Safe | Cacheable |
|---|---|---|---|---|
| GET | Reads a resource | Yes | Yes | Yes |
| POST | Creates a resource or trigger a process that handles data | No | No | Yes if response contains freshness info |
| PUT | Creates or replace a resource | Yes | No | No |
| POST | Creates a resource or triggers a process that handles data | No | No | Yes if response contains freshness info |
| PUT | Creates or replaces a resource | Yes | No | No |
| PATCH | Partially updates a resource | No | No | Yes if response contains freshness info |
| DELETE | Deletes a resource | Yes | No | No |
@ -1665,7 +1665,7 @@ Handy metrics based on numbers above:
| Design the Facebook timeline function | [facebook.com](https://www.facebook.com/note.php?note_id=10150468255628920)<br/>[highscalability.com](http://highscalability.com/blog/2012/1/23/facebook-timeline-brought-to-you-by-the-power-of-denormaliza.html) |
| Design the Facebook chat function | [erlang-factory.com](http://www.erlang-factory.com/upload/presentations/31/EugeneLetuchy-ErlangatFacebook.pdf)<br/>[facebook.com](https://www.facebook.com/note.php?note_id=14218138919&id=9445547199&index=0) |
| Design a graph search function like Facebook's | [facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-building-out-the-infrastructure-for-graph-search/10151347573598920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-indexing-and-ranking-in-graph-search/10151361720763920)<br/>[facebook.com](https://www.facebook.com/notes/facebook-engineering/under-the-hood-the-natural-language-interface-of-graph-search/10151432733048920) |
| Design a content delivery network like CloudFlare | [figshare.com](https://figshare.com/articles/Globally_distributed_content_delivery/6605972) |
| Design a content delivery network like Cloudflare | [figshare.com](https://figshare.com/articles/Globally_distributed_content_delivery/6605972) |
| Design a trending topic system like Twitter's | [michael-noll.com](http://www.michael-noll.com/blog/2013/01/18/implementing-real-time-trending-topics-in-storm/)<br/>[snikolov .wordpress.com](http://snikolov.wordpress.com/2012/11/14/early-detection-of-twitter-trends/) |
| Design a random ID generation system | [blog.twitter.com](https://blog.twitter.com/2010/announcing-snowflake)<br/>[github.com](https://github.com/twitter/snowflake/) |
| Return the top k requests during a time interval | [cs.ucsb.edu](https://www.cs.ucsb.edu/sites/default/files/documents/2005-23.pdf)<br/>[wpi.edu](http://davis.wpi.edu/xmdv/docs/EDBT11-diyang.pdf) |
@ -1768,7 +1768,7 @@ Handy metrics based on numbers above:
* [Google Research Blog](http://googleresearch.blogspot.com/)
* [Groupon Engineering Blog](https://engineering.groupon.com/)
* [Heroku Engineering Blog](https://engineering.heroku.com/)
* [Hubspot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [HubSpot Engineering Blog](http://product.hubspot.com/blog/topic/engineering)
* [High Scalability](http://highscalability.com/)
* [Instagram Engineering](http://instagram-engineering.tumblr.com/)
* [Intel Software Blog](https://software.intel.com/en-us/blogs/)
@ -1777,7 +1777,7 @@ Handy metrics based on numbers above:
* [Microsoft Engineering](https://engineering.microsoft.com/)
* [Microsoft Python Engineering](https://blogs.msdn.microsoft.com/pythonengineering/)
* [Netflix Tech Blog](http://techblog.netflix.com/)
* [Paypal Developer Blog](https://medium.com/paypal-engineering)
* [PayPal Developer Blog](https://medium.com/paypal-engineering)
* [Pinterest Engineering Blog](https://medium.com/@Pinterest_Engineering)
* [Reddit Blog](http://www.redditblog.com/)
* [Salesforce Engineering Blog](https://developer.salesforce.com/blogs/engineering/)