GoogleDrive

• Functional requirements

  • Core

  • Optional

• Non-Functional requirements

  • High performance

  • Reliable storage

  • High availability

  • Data security

  • No duplication

  • Real world practices

Functional requirements

Core

• File upload

• File download

• File continue uploading/downloading on interruption

Optional

• File sharing

• Speed control to prioritize paid users

Non-Functional requirements

High performance

• 10^8 TB storage space, 10^4 average QPS, 80 Gb/s

Reliable storage

• Files don't get lost. Reliability reaches 99.9999%, 1 lost file among 1 million files.

High availability

• 99.99% availability per year. Less than 53 minutes downtime per year.

Data security

• Files are encrypted when stored on the web server. People other than the user itself and shared ones could not read the file.

No duplication

• If the same file is uploaded by two different users, the later does not need to upload again from the beginning.

Real world practices

• https://www.infoq.com/presentations/dropbox-infrastructure/

  • How do we scale Dropbox slides

  • Dropbox security whitepaper

  • S3 design