System Design Fundamentals

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What is Leader and Follower Pattern?

Background

Distributed systems keep multiple copies of data for fault tolerance and higher availability. A system can use quorum to ensure data consistency between replicas, i.e., all reads and writes are not considered successful until a majority of nodes participate in the operation. However, using quorum can lead to another problem, that is, lower availability; at any time, the system needs to ensure that at least a majority of replicas are up and available, otherwise the operation will fail

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Sid D

Sid D

· a year ago

The first section mentions that it’s possible to have inconsistent data reads even while using a quorum of nodes. How is that possible.

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Sid D

Sid D

· a year ago

Leader-Follower seems to be an alternative approach to quorum.

Can you add the tradeoffs between the two. When is one better over the other. Any examples that convey this choice.

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S

Suraj Gupta Gudla

· 4 months ago

But isn't this an example for highly available but eventually consistent system.

Whereas quorum always guarantees strict consistency.