Christopher Smith created ZOOKEEPER-2873:

             Summary: print error and/or abort on invalid server definition
                 Key: ZOOKEEPER-2873
             Project: ZooKeeper
          Issue Type: Improvement
          Components: server
    Affects Versions: 3.4.10
            Reporter: Christopher Smith
            Priority: Minor

While bringing up a new cluster, I managed to fat-finger a sed script and put 
some lines like this into my config file:


This led to a predictable spew of error messages when the client and election 
components fought over the single port. Since a configuration of this case is 
*always* an error, I suggest that it would be sensible to abort the server 
startup if an entry is found with the same port for both client and election. 
(Logging the error explicitly without shutting down is less helpful because of 
how fast the logs pile up.)

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