KeyError: 'ibm_db_sa' when trying to use db2 with Apache Airflow

问题

I've setup a database connection using sql_alchemy_conn = ibm_db_sa://{USERNAME}:{PASSWORD}@{HOST}:50000/airflow in the airflow.cfg file.

When I run airflow initdb, it pops up KeyError: 'ibm_db_sa'. How can I use a DB2 connection with Airflow?

===============

Here is more specific error message:

airflow initdb
[2017-02-01 15:55:57,135] {__init__.py:36} INFO - Using executor SequentialExecutor
DB: ibm_db_sa://db2inst1:***@localhost:50000/airflow
[2017-02-01 15:55:58,151] {db.py:222} INFO - Creating tables
Traceback (most recent call last):
  File "/opt/anaconda/bin/airflow", line 15, in <module>
    args.func(args)
  File "/opt/anaconda/lib/python2.7/site-packages/airflow/bin/cli.py", line 524, in initdb
    db_utils.initdb()
  File "/opt/anaconda/lib/python2.7/site-packages/airflow/utils/db.py", line 106, in initdb
    upgradedb()
  File "/opt/anaconda/lib/python2.7/site-packages/airflow/utils/db.py", line 230, in upgradedb
    command.upgrade(config, 'heads')
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/command.py", line 174, in upgrade
    script.run_env()
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/script/base.py", line 416, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/util/pyfiles.py", line 93, in load_python_file
    module = load_module_py(module_id, path)
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/util/compat.py", line 79, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/opt/anaconda/lib/python2.7/site-packages/airflow/migrations/env.py", line 74, in <module>
    run_migrations_online()
  File "/opt/anaconda/lib/python2.7/site-packages/airflow/migrations/env.py", line 65, in run_migrations_online
    compare_type=COMPARE_TYPE,
  File "<string>", line 8, in configure
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/runtime/environment.py", line 773, in configure
    opts=opts
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/runtime/migration.py", line 159, in configure
    return MigrationContext(dialect, connection, opts, environment_context)
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/runtime/migration.py", line 103, in __init__
    self.impl = ddl.DefaultImpl.get_by_dialect(dialect)(
  File "/opt/anaconda/lib/python2.7/site-packages/alembic/ddl/impl.py", line 65, in get_by_dialect
    return _impls[dialect.name]
KeyError: 'ibm_db_sa'

回答1:

Did you install the required package for db2? Eg. pip install ibm_db_sa. By the way the pypi page lists that it is only compatible with python 3.

Please note that db2 is not officially supported as a backend for Airflow.

来源：https://stackoverflow.com/questions/41990945/keyerror-ibm-db-sa-when-trying-to-use-db2-with-apache-airflow

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airflow