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Azure Functionsと共に利用すると便利なフルマネージドNoSQLサービスである「Azure DocumentDB」が名称変更して「Azure Cosmon DB」になったようです。
以下、Azure Portal上の説明を引用します。
Azure Cosmos DB is a fully managed, globally-distributed, horizontally scalable in storage and throughput, multi-model database service backed up by comprehensive SLAs. Azure Cosmos DB is the next generation of Azure DocumentDB. Cosmos DB was built from the ground up with global distribution and horizontal scale at its core – it offers turn-key global distribution across any number of Azure regions by transparently scaling and replicating your data wherever your users are. You can elastically scale throughput and storage worldwide and pay only for the throughput and storage you need. Cosmos DB guarantees single-digit millisecond latencies at the 99th percentile anywhere in the world, offers multiple well-defined consistency models to fine-tune for performance and guaranteed high availability with multi-homing capabilities – all backed by industry leading service level agreements (SLAs).
Cosmos DB is truly schema-agnostic – it automatically indexes all the data without requiring you to deal with schema and index management. Cosmos DB is multi-model – it natively supports document, key-value, graph and columnar data models. With Cosmos DB, you can access your data using NoSQL APIs of your choice – DocumentDB SQL (document), MongoDB (document), Azure Table Storage (key-value), and Gremlin (graph), are all natively supported. Cosmos DB is a fully managed, enterprise ready and trustworthy service. All your data is fully and transparently encrypted and secure by default. Cosmos DB is ISO, FedRAMP, EU, HIPAA, and PCI compliant as well.
委細について、本日深夜(日本時間)に開催される Build 2017 での発表が気になるところです。
なお、ライブビューイングがストリーミング配信される様ですので、そちらも見ておくと良いと思われます。