Most of the objects will be replicated within seconds.
99% of the objects will be replicated within 5 minutes.
99.99% of the objects will be replicated within 15 minutes.
對應的賠償是：
When you enable this feature, you benefit from the associated Service Level Agreement. The SLA is expressed in terms of a percentage of objects that are expected to be replicated within 15 minutes, and provides for billing credits if the SLA is not met:
主要的改變是 2019/07/08 之後提供的 intermediate CA 會改變，從現在的 cross-sign 變成只有自己的 Root CA：
On July 8, 2019, we will change the default intermediate certificate we provide via ACME. Most subscribers don’t need to do anything. Subscribers who support very old TLS/SSL clients may want to manually configure the older intermediate to increase backwards compatibility.
Our current cross-signature from IdenTrust expires on March 17, 2021. The IdenTrust root that we are cross-signed from expires on September 30, 2021. Within the next year we will obtain a new cross-signature that is valid until September 29, 2021. This means that our subscribers will have the option to manually configure a certificate chain that uses IdenTrust until September 29, 2021.
Submariner is a tool built to connect overlay networks of different Kubernetes clusters. While most testing is performed against Kubernetes clusters that have enabled Flannel/Canal, Submariner should be compatible with any CNI-compatible cluster network provider, as it utilizes off-the-shelf components such as strongSwan/Charon to establish IPsec tunnels between each Kubernetes cluster.
看起來不是 multi-master (從 secondary region 這個字看)，所以寫入的部分還是得送回 primary region 處理：
Aurora Global Database uses storage-based replication with typical latency of less than 1 second, using dedicated infrastructure that leaves your database fully available to serve application workloads. In the unlikely event of a regional degradation or outage, one of the secondary regions can be promoted to full read/write capabilities in less than 1 minute.
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.
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.
Separation of Concerns – Customers would like to handle and respond to events in a separate account in order to implement advanced security schemes.
另外一種則是為了將記錄丟到同一個地方：
Rollup – Customers are using AWS Organizations and would like to track certain types of events across the entire organization, across a multitude of AWS accounts.
價錢看起來沒什麼問題，每一百萬次收 USD$1：
Events forwarded from one account to another are considered custom events. The sending account is charged $1 for every million events (see the CloudWatch Pricing page for more info).
With just 12 ms of round-trip latency between US East (Ohio) and US East (Northern Virginia), you can make good use of unique AWS features such as S3 Cross-Region Replication, Cross-Region Read Replicas for Amazon Aurora, Cross-Region Read Replicas for MySQL, and Cross-Region Read Replicas for PostgreSQL.
其中有個特別的地方在於 us-east-{1,2} 之間傳輸的費用會以 Inter-AZ 計費，而非以跨 region 計費。大概是希望讓大家有動力多放些東西過去，畢竟 us-east-1 實在太大，穩定性超有名的關係 XDDD：
Data transfer between the two Regions is priced at the Inter-AZ price ($0.01 per GB), making your cross-region use cases even more economical.
