Cluster architecture in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Redis Cluster architecture?

Redis Cluster is a way to run Redis across multiple servers to share data and handle more requests. It splits data into parts called slots and spreads them across different nodes.

beginner

How does Redis Cluster distribute data?

Redis Cluster divides data into 16,384 slots. Each key is assigned to one slot, and slots are distributed among nodes. This helps balance data and load.

intermediate

What is the role of master and replica nodes in Redis Cluster?

Master nodes hold the main data and handle writes. Replica nodes copy data from masters to provide backup and help if a master fails.

intermediate

How does Redis Cluster handle node failures?

If a master node fails, Redis Cluster promotes a replica to master automatically. This keeps the cluster working without losing data.

beginner

Why is Redis Cluster considered scalable?

Redis Cluster allows adding more nodes to spread data and requests. This means it can grow easily to handle more users or data.

How many hash slots does Redis Cluster use to distribute data?

A 512

B 16,384

C 65,536

D 1,024

Redis Cluster divides data into 16,384 hash slots to distribute keys evenly.

What happens when a master node fails in Redis Cluster?

A A replica node is promoted to master

B Data is lost permanently

C The cluster stops working

D All nodes restart automatically

Redis Cluster promotes a replica to master to keep the cluster running without data loss.

Which node type in Redis Cluster handles write operations?

A Proxy nodes

B Replica nodes

C Client nodes

D Master nodes

Master nodes hold the main data and handle write requests.

Why does Redis Cluster use multiple nodes?

A To make the system slower

B To increase data security only

C To distribute data and load for scalability

D To store backups offline

Multiple nodes help spread data and requests, making Redis Cluster scalable.

What is a hash slot in Redis Cluster?

A A storage unit for keys

B A type of node

C A client connection

D A backup file

A hash slot is a unit that holds keys and helps distribute data across nodes.

Explain how Redis Cluster distributes data and manages node roles.

Think about how data is split and which nodes do what.

Describe how Redis Cluster ensures availability when a node fails.

Focus on what happens behind the scenes when a master node stops working.