[jira] [Created] (AIRFLOW-496) HiveServer2Hook invokes incorrect Auth mechanism when user not specified

["Shreyas Joshi (JIRA)" <ji...@apache.org>]

Shreyas Joshi created AIRFLOW-496:
-------------------------------------

             Summary: HiveServer2Hook invokes incorrect Auth mechanism when user not specified
                 Key: AIRFLOW-496
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-496
             Project: Apache Airflow
          Issue Type: Bug
          Components: hive_hooks
            Reporter: Shreyas Joshi


h3. Summary
{{HiveServer2Hook}} Seems to be ignoring the auth_mechanism when the user is not specified. I am not entirely sure if the solution should be should change impyala or Airflow.

h3. Reproducing the problem
With this connection string for Hive: {{AIRFLOW_CONN_GH_HIVE=hive2://@localhost:10000/}} (No user name and no password)

 I get the following error from {{HiveServer2hook}}:

{code}
from airflow.hooks import HiveServer2Hook
hive_hook = HiveServer2Hook (hiveserver2_conn_id='GH_HIVE')
{code}

{noformat}
[2016-09-08 14:30:52,420] {base_hook.py:53} INFO - Using connection to: localhost
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/airflow/hooks/hive_hooks.py", line 464, in get_conn
    database=db.schema or 'default')
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/impala/dbapi.py", line 147, in connect
    auth_mechanism=auth_mechanism)
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/impala/hiveserver2.py", line 658, in connect
    transport.open()
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/thrift_sasl/__init__.py", line 72, in open
    message=("Could not start SASL: %s" % self.sasl.getError()))
thriftpy.transport.TTransportException: TTransportException(type=1, message="Could not start SASL: b'Error in sasl_client_start (-4) SASL(-4): no mechanism available: No worthy mechs found'")
{noformat}

h3. More detail
[Here|https://github.com/apache/incubator-airflow/blob/master/airflow/hooks/hive_hooks.py#L591] {{db.login}} ends up being an empty string rather than {{None}}. This seems to cause impala to try sasl. Changing {{db.login}} from an empty string to {{None}} seems to fix the issue. 

So, the following does not work

{code}
from impala.dbapi import connect
connect (host='localhost', port=10000, user='', auth_mechanism='PLAIN', database= 'default')
{code}

The error is:
{noformat}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/impala/dbapi.py", line 147, in connect
    auth_mechanism=auth_mechanism)
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/impala/hiveserver2.py", line 658, in connect
    transport.open()
  File "/Users/shreyasjoshis/python-envs/default-env/lib/python3.5/site-packages/thrift_sasl/__init__.py", line 72, in open
    message=("Could not start SASL: %s" % self.sasl.getError()))
thriftpy.transport.TTransportException: TTransportException(type=1, message="Could not start SASL: b'Error in sasl_client_start (-4) SASL(-4): no mechanism available: No worthy mechs found'")
{noformat}

But the following does:

{code}
from impala.dbapi import connect
connect (host='localhost', port=10000, user=None, auth_mechanism='PLAIN', database= 'default')
{code}



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