Looking into DocumentDB

With the release of the DocumentDB emulator it is possible to dig deeper into the magic that is hidden behind the PaaS offering.

It is a native-code guest executable running in a Service Fabric context

It is deployed as 5 services to Fabric

• DataExplorer
• DataExplorerUpdater
• Gateway
• MasterService
• ServerService

It isn’t really that big an assembly size/complexity, compared to many other databases (nor should it be).

It writes these kind of files/folders when creating documents:

The edb.log is the file that gets written when I create a document. It writes 4KB pages in sequential order.

e.g.

First document:

Offset: 327,680

Length: 4,096

Second document:

Offset: 331,776

Length: 4,096

The data is not encrypted (this is on Microsoft's roadmap).