keith-turner commented on issue #1139: Ensure 2.0.0 upgrade works properly when 1.9 tservers are still running URL: https://github.com/apache/accumulo/issues/1139#issuecomment-488047585 I ran this experiment and the 2.0 master was unable to authenticate with the 1.9 tserver. I dug into why and its because the system token hashes all instance properties (including default values) to generate the system password. Accumulo 2.0 has a new instance property `instance.crypto.service` that is not present in 1.9. This new property is what caused authentication to fail. There is also a wire version constant that is included in the system token. I think it may make sense to bump this.
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