Master-replica architecture in Redis - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the role of the master in a master-replica architecture?

The master handles all write operations and propagates data changes to replicas to keep them updated.

beginner

What is a replica in the master-replica architecture?

A replica is a copy of the master that receives data updates and handles read requests to reduce load on the master.

intermediate

How does data consistency work between master and replicas?

Replicas asynchronously receive updates from the master, so there might be a slight delay before replicas reflect the latest data.

beginner

Why use a master-replica architecture in Redis?

It improves read scalability by distributing read requests to replicas and increases availability if the master fails.

intermediate

What happens if the master fails in a master-replica setup?

One of the replicas can be promoted to master to continue serving writes, ensuring minimal downtime.

In Redis master-replica architecture, which node handles write operations?

A Neither

B Replica

C Both master and replica

D Master

Only the master node handles write operations; replicas handle read requests.

What is the main benefit of having replicas in Redis?

A To handle write requests

B To improve read scalability

C To store backups only

D To replace the master permanently

Replicas help by handling read requests, reducing load on the master.

How do replicas get updated data from the master?

A Asynchronously with some delay

B Manually by the user

C Synchronously in real-time

D They do not get updated

Replicas receive updates asynchronously, so there can be a small delay.

If the master fails, what is a common solution in Redis master-replica architecture?

A Stop all operations

B Wait for the master to recover

C Promote a replica to master

D Delete all data

A replica is promoted to master to maintain availability.

Which of these is NOT a feature of master-replica architecture?

A Automatic write load balancing across replicas

B Improved read performance

C Data redundancy

D Failover support

Write operations are only handled by the master, not balanced across replicas.

Explain how master and replicas work together in Redis master-replica architecture.

Think about who writes data and who reads data.

Describe what happens when the master node fails in a Redis master-replica setup.

Consider how the system keeps working without the master.