Google

Question 1

What is Borg?

Answer 1

Borg is the cluster operating system (e.g. resource allocation)

Question 2

Describe the topology of a Google datacenter

Answer 2

• Tens of machines are placed in a rack
• Racks stand in a row
• One or more rows form a cluster
• Usually a datacenter building houses multiple clusters
• Multiple datacenter buildings that are located close together form a campus

Question 3

What is Jupiter?

Answer 3

Connection of hundreds of Google-built high-performance switches in a Clos network fabric.
In its largest configuration, Jupiter supports 1.3 Pbps bisection bandwidth among servers.

Question 4

What is B4?

Answer 4

Google’s globe-spanning backbone network (Private WAN)

Question 5

What is Colossus?

Answer 5

Colossus is a cluster-wide filesystem that offers usual filesystem semantics, as well as replication and encryption. Colossus is the successor to GFS, the Google File System

Question 6

What is Bigtable?

Answer 6

Bigtable is a NoSQL database system that can handle databases that are petabytes in size.

Question 7

What is Spanner?

Answer 7

Spanner offers an SQL-like interface for users that require real consistency across the world.

Question 8

What is Chubby?

Answer 8

The Chubby lock service provides a filesystem-like API for maintaining locks. Chubby handles these locks across datacenter locations. It uses the Paxos protocol for asynchronous Consensus