RkGrit opened a new pull request, #1246:
URL: https://github.com/apache/ratis/pull/1246

   ## What changes were proposed in this pull request?
   
   When the leader has no snapshot (forcing log-based catch-up), the new peer 
might lack timely configuration change logs due to stagingCatchupGap. This 
leaves the new peer with outdated configurations, violating Raft's membership 
change safety guarantees.
   To solve this problem, the Leader is essentially required to ensure that the 
configuration of the Follower is the latest when the Follower completes the 
catch-up.
   We add one more condition to the CAUGHTUP judgment logic. That is, CAUGHTUP 
is complete only after a follower receives the latest conf logs from the leader.
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/RATIS-2274
   
   ## How was this patch tested?
   
   unit tests
   


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