IOP (v 4.2.0) to HDP (v 2.6.x) : HSI install fails with Configuration parameter 'hive.llap.daemon.service.principal' missing in dictionary.

[#1]

PROBLEM:

After upgrade from IOP (v 4.2.0) to HDP (v 2.6.x) in a kerberized setup, HSI install fails with Configuration parameter 'hive.llap.daemon.service.principal' missing in dictionary.

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/HIVE/0.12.0.2.0/package/scripts/hive_server_interactive.py", line 616, in <module>
    HiveServerInteractive().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 329, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/common-services/HIVE/0.12.0.2.0/package/scripts/hive_server_interactive.py", line 75, in install
    import params
  File "/var/lib/ambari-agent/cache/common-services/HIVE/0.12.0.2.0/package/scripts/params.py", line 27, in <module>
    from params_linux import *
  File "/var/lib/ambari-agent/cache/common-services/HIVE/0.12.0.2.0/package/scripts/params_linux.py", line 697, in <module>
    hive_llap_principal = (config['configurations']['hive-interactive-site']['hive.llap.daemon.service.principal']).replace('_HOST',hostname.lower())
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/config_dictionary.py", line 73, in __getattr__
    raise Fail("Configuration parameter '" + self.name + "' was not found in configurations dictionary!")
resource_management.core.exceptions.Fail: Configuration parameter 'hive.llap.daemon.service.principal' was not found in configurations dictionary!

Reason:

HSI related keytabs are missing on cluster.

Fix:

Regenerate keytabs via Ambari.

- Once regeneration is done, you can reinstall HSI and start it.

P.S. : Hive Server Interactive is made up of 2 sub-components : LLAP and Hive2/HiveServer2.

Thanks to @vrathod for reporting it.