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Here is a great reference for connection URL: https://ask.streamsets.com/question/7/how-do-you-configure-a-hive-impala-jdbc-driver-for-data-collector/?answer=8#post-id-8

Also, just to double check: Is your connection URL suffix exactly like default;principal=hive/_HOST@HADOOP ? Reason is: generally it will be something like default;principal=hive/hive-server2-host.company.com@COMPANY.COM where of course, your substitution will be according to your kerberos principal. This should be the exact principal that one can see from CM web UI.