What I've narrowed down is that when I get this error it's because Toad is unable to handle the "_HOST" when making the connection string.
When I change the principal=hive/<FQDN_HIVESERVER>@<DOMAIN> I'm able to successfully connect to Hiveserver2.
Now for the where I run into an ultimate problem. While using:
I'm only attaching to <FQDN_HIVESERVER_1> and when it goes down I'm not longer able to connect because I'm now passing the incorrect Kerberos Principal to <FQDN_HIVESERVER_2>. As soon as I manually switch over my connection string I'm able to connect to FQDN_HIVESERVER_2, but if that server goes down I'm not having to manually edit my connection strings each time I want to connect if I have an issue. Which I think defeats the purpose of HA.
Has anyone been able to get Toad to pass either the _HOST or Configured it to work with JDBC Hiveserver2 HA with Zookeeper?
I have not played with this myself, but basically you need to provide your load balancer access to hiveserver2 which is what you are missing. According to the link above, you need to add following. Follow that JIRA. I think your load balancer need to have access to hiveserver2 which it doesn't have, hence GSS initiate failed.