Is RAFT synchronous or asynchronous?

[Abhijeet Kumar]

Hello All,
Sorry for asking a noob question. Plez don't mind. I started to learn about Raft consensus method yesterday only

Is Raft consensus method synchronous or asynchronous?

Please help me to understand the topic better. Thanks in adv

[Henrik Ingo]

Hi Kumar

For some reason academic literature doesn't use the synchronous/asynchronous vocabulary. But I would definitively classify Raft as synchronous. It replicates events first, and only after successful replication are they considered committed and success is returned to client.

It's further worth pointing out that Raft is a majority based protocol. Sometimes with synchronous protocols - such as 2 phase commit - the replication needs to happen to all cluster nodes in order to be successful. In Raft it is sufficient that a majority of nodes have replicated the event.

henrik

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