Now you can invoke Lambda functions directly from within an Aurora database via stored procedures or user-defined functions. Lambda integration allows you to extend the capabilities of the database and invoke external applications to act upon data changes. For example, you can create a Lambda function that sends emails to customers whenever their address in the database is updated.
You can access the service via the link local 169.254.169.123 IP address. This means you don’t need to configure external internet access and the service can be securely accessed from within your private subnets.
然後也有提到 leap second 的解法，用的解法是 leap smearing：
Leap seconds are known to cause application errors and this can be a concern for many savvy developers and systems administrators. The 169.254.169.123 clock smooths out leap seconds some period of time (commonly called leap smearing) which makes it easy for your applications to deal with leap seconds.
先前 AWS 也有 leap time，但不包括 Amazon EC2 這些系統 (EC2 裡的時間是獨立的)，不過還是可以看一下 AWS 處理 leap time 的方式，因為這次 NTP Service 就會拿去用了。
EFS File Sync is available in the US East (N. Virginia), US East (Ohio), US West (Oregon), and EU (Ireland) regions, with availability in the EU (Frankfurt) and Asia Pacific (Sydney) regions coming in December 2017.
In this paper we present an algorithm and formal semantics for a JSON data structure that automatically resolves concurrent modifications such that no updates are lost, and such that all replicas converge towards the same state.
作者提出來的想法不是很複雜，而且 merge 保留姿的方法也頗... 特別，但總是給大家一個想法，各何況很多情況下都是有 server 架構，就簡單多了...