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Amazon DynamoDB 跨區 Replication 以及備份

Amazon DynamoDB 實做了全球性的 replication,以及備份功能:「Amazon DynamoDB Update – Global Tables and On-Demand Backup」。

跨區 replication 的功能讓每個 region 都可以存取當地機房的 DynamoDB:

Global Tables – You can now create tables that are automatically replicated across two or more AWS Regions, with full support for multi-master writes, with a couple of clicks. This gives you the ability to build fast, massively scaled applications for a global user base without having to manage the replication process.

這有點類似 GoogleCloud Spanner 在前陣子也推出全球性服務,但 DynamoDB 提供的比較偏向 NoSQL 而不是 RDBMS。

另外一個限制是跨區同步是 async,會有 replication lag 的問題:

Updates are propagated to other Regions asynchronously via DynamoDB Streams and are typically complete within one second (you can track this using the new ReplicationLatency and PendingReplicationCount metrics).

不過如果是這樣的機制,conflict 的問題不知道怎麼解決... 文章裡面沒看到。

然後目前支援的區域還是有限:

Global Tables are available in the US East (Ohio), US East (N. Virginia), US West (Oregon), EU (Ireland), and EU (Frankfurt) Regions today, with more Regions in the works for 2018.

另外一個是備份與還原機制,有這樣的功能對很多計畫方便不少:

On-Demand Backup – You can now create full backups of your DynamoDB tables with a single click, and with zero impact on performance or availability. Your application remains online and runs at full speed. Backups are suitable for long-term retention and archival, and can help you to comply with regulatory requirements.

而備份還原機制是陸陸續續開放的,區域也有限:

We are rolling this new feature out on an account-by-account basis as quickly as possible, with initial availability in the US East (Northern Virginia), US East (Ohio), US West (Oregon), and EU (Ireland) Regions.

AWS 總算推出跨區 VPC Peering 了...

AWS 總算是開始支援跨區 VPC Peering 了... 這功能喊好久了啊:「Announcing Support for Inter-Region VPC Peering」。

不過目前支援的地區只有這些:

Inter-Region VPC Peering is available in AWS US East (N. Virginia), US East (Ohio), US West (Oregon) and EU (Ireland) with support for other regions coming soon.

算是個開頭... 不然以前都要自己搞 High Availability 的 site-to-site IPsec tunnel。

另外沒看到跨區時有沒有加密... (理論上應該要?)

Amazon Aurora (PostgreSQL 版本) 開放到其他區域了

上個月月底才宣佈 Amazon Aurora 推出 PostgreSQL 版本 (參考「Amazon Aurora 也支援 PostgreSQL 了」),不過當時只有少數的四個區域開放 (us-east-1us-east-2us-west-2eu-west-1),還不到一個月的時間就擴張了:「Amazon Aurora with PostgreSQL Compatibility Region Expansion」。

不過還是沒有東京與新加坡這兩個台灣比較常用的區域... 看起來都是比較新的 region,但首爾應該也是新的區域啊,不知道怎麼選擇的:

The PostgreSQL-compatible edition of Amazon Aurora is now available in four additional AWS regions: Canada (Central), EU (Frankfurt), Asia Pacific (Sydney), and Asia Pacific (Mumbai). This increases the number of available regions to eight, as the service launched on October 24, 2017 in US East (N. Virginia), US East (Ohio), US West (Oregon), and EU (Ireland).

AWS 推出 AWS Secret Region

AWS 推出給情報單位用的 AWS Secret Region:「Announcing the New AWS Secret Region」。

AWS GovCloud (US) 類似的架構,這個雲的範圍再小一些,給情報單位以及有對應授權的單位用的:

The AWS Secret Region is readily available to the U.S. Intelligence Community (IC) through the IC’s Commercial Cloud Services (C2S) contract with AWS.

The AWS Secret Region also will be available to non-IC U.S. Government customers with appropriate Secret-level network access and their own contract vehicles for use of the AWS Secret Region.

Amazon API Gateway 可以獨立運作了...

Amazon API Gateway 先前一定要跟 Amazon CloudFront 綁在一起 (而且還是很奇怪的 distribution,不是 Price Class 裡面任何一種分類),現在總算可以獨立自己運作了:「Amazon API Gateway Supports Regional API Endpoints」。

A regional API endpoint is a new type of endpoint that is accessed from the same AWS region in which your REST API is deployed. This helps you reduce request latency when API requests originate from the same region as your REST API.

而且這樣一來,如果還是要用 Amazon CloudFront 擋在前面的話,可以自己選擇 Price Class:

Additionally, you can now choose to associate your own Amazon CloudFront distribution with the regional API endpoint.

以前用起來頗莫名其妙的 XDDD

AWS 將在阿拉伯聯合大公國擴點

AWS 新的擴張計畫:「In the Works – AWS Region in the Middle East」。

兩個比較大的階段,第一個是在 2018Q1 先建 PoP,把 CloudFrontRoute 53 之類的服務先接上去:

We also plan to open an edge location in the UAE in the first quarter of 2018. This will bring Amazon CloudFront, Amazon Route 53, AWS Shield, and AWS WAF to the region, adding to our existing set of 84 points of presence world-wide.

再來是 2019 上半年建 region:

I am happy to announce that we will be opening an AWS Region in the Middle East by early 2019. The new Region will be based in Bahrain, will be comprised of three Availability Zones at launch, and will give AWS customers and partners the ability to run their workloads and store their data in the Middle East.

這樣就會變成離非洲最近的 region 了... (目前應該是印度?)

寄硬碟的 AWS Snowball 與 AWS Snowball Edge 支援東京了

AWS SnowballAWS Snowball Edge 這兩個服務實際上就是透過硬碟寄送加速資料傳遞,只是做了很多保護 (物理面與資料安全面)。

而這兩個服務宣佈在東京區開放了 (ap-northeast-1,包括 AWS Snowball 與 AWS Snowball Edge):「AWS Snowball and AWS Snowball Edge Available in Asia Pacific (Tokyo) Region」。

這樣對於需要倒入 (以及倒出) 大量資料的服務又簡化了不少... (以往要從其他地區想辦法,而且還會遇到不支援寄來台灣的問題)

AWS 香港區 2018 開台

業界這幾個月也傳的頗盛的消息總算也公開了。AWS 預定在 2018 年開香港區:「In the Works – AWS Region in Hong Kong」。

Today, I am happy to be able to tell you that we are planning to open up an AWS Region in Hong Kong, in 2018.

不過 HiNet 對香港的頻寬一直是個痛 (塞翻了),反倒是到日本的頻寬還比較順。明年上線後可以觀察看看 XDDD

另外日本有稅的問題,單價比起亞洲其他點高不少 (與新加坡比起來蠻明顯的)。香港的價錢不知道會怎麼算,雖然稅可能比較低 (maybe),但畢竟是一個沒什麼土地的地區,會不會在機器成本上其實也補回來不少...

然後再來是代碼,應該會是 ap-southeast-3

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