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lease: process renew request via raft
Previously, the renew request can only be processed by the leader. If a follower receives the renew request, it just forwards the request to the leader via a internal http channel. This isn't accurate because the leader may change during the process. When a leader receives the renew request, the previous implementation follows a three stage workflow: pre-raft, raft and post-raft. It's too complicated and error prone, and the raft is more like just a network transport channel instead of a concensus mechanism in this case. So we process the renew request via raft directly, it can greatly simplify the code.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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