example_twitter_dag.py cannot import name HiveOperator

Dear Airflow Maintainers,

Environment

Before I tell you about my issue, let me describe my Airflow environment:

Please fill out any appropriate fields:

Airflow version: (release number or git log --oneline | head -n 3) airbnb_1.7.1rc3
Airflow components: (e.g. "webserver and scheduler with a postgres database and LocalExecutor") Found in example_twitter_dag.py
Relevant airflow.cfg settings:
Python Version: (python --version) Python 2.7.6
Operating System: (Windows version or uname -a) Linux ip-172-31-46-134 3.13.0-74-generic #118-Ubuntu SMP Thu Dec 17 22:52:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Running on Amazon EC2 Ubuntu 14.04 AMI
Python packages: (pip freeze or conda list) $ pip freeze -e git://github.com/airbnb/airflow.git@f1ff65c8cde913fd9bfa8b21f83c7300b8b0effd#egg=airflow alembic==0.8.6 amqp==1.4.9 anyjson==0.3.3 Babel==1.3 backports.ssl-match-hostname==3.5.0.1 billiard==3.3.0.23 celery==3.1.23 certifi==2016.2.28 cffi==1.6.0 chartkick==0.4.2 croniter==0.3.12 cryptography==1.3.1 dill==0.2.5 docutils==0.12 enum34==1.1.4 Flask==0.10.1 Flask-Admin==1.4.0 Flask-Cache==0.13.1 Flask-Login==0.2.11 Flask-WTF==0.12 flower==0.8.4 funcsigs==0.4 future==0.15.2 futures==3.0.5 gunicorn==19.3.0 idna==2.1 ipaddress==1.0.16 itsdangerous==0.24 Jinja2==2.8 kombu==3.0.35 lockfile==0.12.2 Mako==1.0.4 Markdown==2.6.6 MarkupSafe==0.23 numpy==1.11.0 pandas==0.18.0 psycopg2==2.6.1 pyasn1==0.1.9 pycparser==2.14 Pygments==2.1.3 python-daemon==2.1.1 python-dateutil==2.5.3 python-editor==1.0 pytz==2016.4 redis==2.10.5 requests==2.9.1 setproctitle==1.1.9 six==1.10.0 SQLAlchemy==1.0.12 thrift==0.9.3 tornado==4.2 vertica-python==0.5.6 Werkzeug==0.11.9 WTForms==2.1
Description of Issue

After installing airflow from the tag 'airbnb_1.7.1rc3' I see this error on the admin/ page:

Broken DAG: [/home/airflow/venv/src/airflow/airflow/example_dags/example_twitter_dag.py] cannot import name HiveOperator

Following the imports, I think it is due to this line in airflow/hooks/hive_hooks.py trying to import unicodecsv: https://github.com/airbnb/airflow/blame/master/airflow/hooks/hive_hooks.py#L19

My requirements.txt does not include airflow[hive] so it did not pull in these extra dependencies.

What did you expect to happen? Running the examples out of the box should not result in an error.
What happened instead? An error message on /admin/.
Screen shots of your DAG's graph and tree views, if appropriate:
Stack trace, if appropriate:

[2016-04-27 23:24:01,410] {models.py:250} ERROR - Failed to import: /home/airflow/venv/src/airflow/airflow/example_dags/example_twitter_dag.py
Traceback (most recent call last):
  File "/home/airflow/venv/src/airflow/airflow/models.py", line 247, in process_file
    m = imp.load_source(mod_name, filepath)
  File "/home/airflow/venv/src/airflow/airflow/example_dags/example_twitter_dag.py", line 26, in <module>
    from airflow.operators import BashOperator, HiveOperator, PythonOperator
ImportError: cannot import name HiveOperator

Reproducing the Issue

Here is how you can reproduce this issue on your machine.

Example code that reproduces the issue, including a minimally illustrative DAG if necessary:
Reproduction steps:
1. Minimal airflow install from airbnb_1.7.1rc3
2. Start the webserver.
3. Notice the error message on the DAGs section.

apache / airflow

example_twitter_dag.py cannot import name HiveOperator #1446

Environment

Description of Issue

Reproducing the Issue