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schedule: change merge match peers strategy #1339
What problem does this PR solve?
There is a case that a follower is added and transfer leader to it, and the apply process of it is slow so leader regards it as a voter but actually it is still a learner. Once that, the follower can't be a leader, but the old leader can't know that so there is no leader to serve for a while.
What is changed and how it works?
change merge match peers strategy, transfer leader to the first added follower if there is no intersection store, and remove one peer after adding one peer.