Impala DVT connection does not allow use-ssl parameter that is allowed in impyla under the hood.

[wt1309]

The use-ssl parameter is not included in the DVT connection parameters, however, the Impala connection I am working with today is kerberized and requires SSL flag to be true. I performed the following to get this to work. Plan to eventually submit a pull request once I get some time, but for now, here is the solution:

1. Missing python library: sudo pip3 install kerberos
2. Used port 21050 instead of 21000 (21000 works for CLI impala shell)
3. Update DVT source code to accomodate new parameter use_ssl

• Add following lines of code after Line 35, 42,and 48 respectively:

  professional-services-data-validator/third_party/ibis/ibis_impala/api.py

  after line 35: use_ssl=False
  after line 42: use_ssl = (use_ssl, False)[use_ssl is None]
  after line 48: use_ssl=use_ssl,

• Add the following line of code after Line 131 in:

  professional-services-data-validator/data_validation/cli_tools.py

  after line 131: ["use_ssl", "Use SSL when connecting to HiveServer2 (default is False)"],

4. cd to professional-services-data-validator folder
5. Then run command to build new code: sudo python3 -m pip install .

Now this connection should work:
data-validation connections add --connection-name <Conneciton_Name> Impala --host --auth-mechanism GSSAPI --kerberos-service-name impala --port 21050 --use-ssl True

[mloeberc]

closed by PR #790