MiniSho opened a new pull request, #7264:
URL: https://github.com/apache/iotdb/pull/7264

   We should add a precheck when the confignode executes removing datanode :
   1. Make sure the node which execute addRegionPeer is in running
   2. Throw an error which says it's not supported to remove the datanode 
because the configuration of the cluster is only one replication.
   


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