Will Berkeley resolved KUDU-2170.
       Resolution: Fixed
    Fix Version/s: 1.6.0

Fixed in c7fa4aaf704e4035843bc8fe20e5ecada2ed1acc

> Masters can start up with duplicate masters specified
> -----------------------------------------------------
>                 Key: KUDU-2170
>                 URL: https://issues.apache.org/jira/browse/KUDU-2170
>             Project: Kudu
>          Issue Type: Bug
>          Components: master
>            Reporter: Andrew Wong
>            Assignee: Will Berkeley
>             Fix For: 1.6.0
> In a multi-master deployment, when a master starts up, it contacts the other 
> masters to gather UUIDs, but doesn't check whether there are any duplicates. 
> This can lead to some scary-looking issues, like duplicate masters showing up 
> in the web UI. It would be nice if this were disallowed.
> Also worth noting: having all unique entries in `master_addresses` doesn't 
> necessarily imply they are all unique masters (e.g. some masters may be 
> specified via DNS aliases).

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