What DocumentDB Means for Open Source

There are at least three reasons why the open source community is paying attention to DocumentDB. The first is that it combines the might of two popular databases: MongoDB (DocumentDB is essentially an open source version of MongoDB) and PostgreSQL. A PostgreSQL extension makes MongoDB’s document functionality available to Postgres; a gateway translates MongoDB’s API to PostgreSQL’s API.

Secondly, the schemaless document store is completely free and accessible through the MIT license. The database utilizes the core of Microsoft Azure…