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Phani Teja
Phani Teja

Reputation: 173

Aurora replicas

Aurora enables you to create a primary writer and a secondary reader. I understand that replicas can be made for the reader to give high availability.

What I don't understand is what's the use when one replicates the writer? I means it's only job is to perform writes. How does a replica for it help?

Upvotes: 0

Views: 88

Answers (1)

Marcin
Marcin

Reputation: 238199

If you talk about writes only, Aurora supports multi-master architectures. In them all db instances are read-write, and there is no such thing as read replicas, as all the instances are equal.

The primary use of it is for situations with zero-tolerance for downtime in writes. When you use regular Aurora clusters (1 write + read replicas), when writer goes down, there is short period of downtime during which no writes are going to happen. This downtime is due to period required to promote one of the read replicas to be the new writer.

In some cases, such downtime in writes is unacceptable. This is where multi-master clusters can be useful.

Multi-master clusters are very special. They have bunch of their own limitations, so their use-cases are rather limited.

The multi-master architecture is supported only for the My-SQL compatible version.

Upvotes: 0

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