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[AIRFLOW-XXX] Better instructions for airflow flower (#4214)
* Better instructions for airflow flower It is not clear in the documentation that you need to have flower installed to successful run airflow flower. If you don't have flower installed, running airflow flower will show the following error which is not of much help: airflow flower [2018-11-20 17:01:14,836] {__init__.py:51} INFO - Using executor SequentialExecutor Traceback (most recent call last): File "/mnt/secondary/workspace/f4/typo-backend/pipelines/model-pipeline/airflow/bin/airflow", line 32, in <module> args.func(args) File "/mnt/secondary/workspace/f4/typo-backend/pipelines/model-pipeline/airflow/lib/python3.6/site-packages/airflow/utils/cli.py", line 74, in wrapper return f(*args, **kwargs) File "/mnt/secondary/workspace/f4/typo-backend/pipelines/model-pipeline/airflow/lib/python3.6/site-packages/airflow/bin/cli.py", line 1 221, in flower broka, address, port, api, flower_conf, url_prefix]) File "/mnt/secondary/workspace/f4/typo-backend/pipelines/model-pipeline/airflow/lib/python3.6/os.py", line 559, in execvp _execvpe(file, args) File "/mnt/secondary/workspace/f4/typo-backend/pipelines/model-pipeline/airflow/lib/python3.6/os.py", line 604, in _execvpe raise last_exc.with_traceback(tb) File "/mnt/secondary/workspace/f4/typo-backend/pipelines/model-pipeline/airflow/lib/python3.6/os.py", line 594, in _execvpe exec_func(fullname, *argrest) FileNotFoundError: [Errno 2] No such file or directory * Update use-celery.rst
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