How do I use the ConfChangeType::AddLearnerNode in propose_conf_change?

[pidb]

Specifically, I want to add a node to the raft group first. But I first add a learner node, and then when the log of the learner node is up-to-date, I make it become the voter.

I see the ConfChangeType::AddLearnerNode in this library, but I'm so sorry because I'm not sure how to use it.

Or the library itself implement the steps I've described? As long as I use ConfChangeType::AddNode. 😂

[BusyJay]

You need to add the learner first by using ConfChangeType::AddLearnerNode, and then promote it to voter using ConfChangeType::AddNode. Adding a learner is similar with add a node.

[pidb]

You need to add the learner first by using ConfChangeType::AddLearnerNode, and then promote it to voter using ConfChangeType::AddNode. Adding a learner is similar with add a node.

Thanks for your reply. I wonder what is the time to promote voter? In other words, Do I need to maintain the log status of learner myself, and when it log up-to-date as the leader, create a ConfChangeType::AddNode to promote it as a voter?

[BusyJay]

Raft maintain the progress in leader, which can be query by status API. You may also want to check out #457.

[pidb]

Raft maintain the progress in leader, which can be query by status API. You may also want to check out #457.

Thanks for your reply. That was great!