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Binbin authored
When arity is -2, it allows us to input two nodes, but returns: ``` *** ERROR: Invalid configuration for cluster creation. *** Redis Cluster requires at least 3 master nodes. *** This is not possible with 2 nodes and 0 replicas per node. *** At least 3 nodes are required. ``` When we input one node, it return: ``` [ERR] Wrong number of arguments for specified --cluster sub command ``` Strictly speaking -2 should also be rejected, because redis-cli requires at least three nodes. However, the error message was not very friendly, so decided to change it arity -1. This closes #12891.
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