We faced the problem on our production kudu cluster. The hard disk with wal catalog was failed on the tablet server. We install new disk and clear data directory according to Kudu documentation https://kudu.apache.org/docs/administration.html#rebuilding_kudu . After starting the failing tablet server we have seen that kudu ksck displayed two instance tablet server for one server with different UUID. One of this server had status "WRONG SERVER_UUID".
Why may the error occure? Are there any ways to avoid it? Is there way to solve the problem without restarting master server?
Also found the command "kudu tserver unregister" for removing tablet server with wrong UUID but we hadn't found this step in documentation.