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https://issues.apache.org/jira/browse/AIRFLOW-2175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388426#comment-16388426
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Sam Schlegel commented on AIRFLOW-2175:
---------------------------------------
We were also affected by this. Added a None check and a test in
https://github.com/apache/incubator-airflow/pull/3104
> Failed to upgradedb 1.8.2 -> 1.9.0
> ----------------------------------
>
> Key: AIRFLOW-2175
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2175
> Project: Apache Airflow
> Issue Type: Bug
> Components: db
> Affects Versions: 1.9.0
> Reporter: Damian Momot
> Priority: Critical
>
> We've got airflow installation with hundreds of DAGs and thousands of tasks.
> During upgrade (1.8.2 -> 1.9.0) we've got following error.
> After analyzing stacktrace i've found that it's most likely caused by None
> value in 'fileloc' field of Dag column. I checked database and indeed we've
> got one record with such value:
>
>
> {code:java}
> SELECT COUNT(*) FROM dag WHERE fileloc IS NULL;
> 1
> SELECT COUNT(*) FROM dag;
> 343
> {code}
>
>
> {code:java}
> Traceback (most recent call last):
> File "/usr/local/bin/airflow", line 27, in <module>
> args.func(args)
> File "/usr/local/lib/python2.7/dist-packages/airflow/bin/cli.py", line 913,
> in upgradedb
> db_utils.upgradedb()
> File "/usr/local/lib/python2.7/dist-packages/airflow/utils/db.py", line 320,
> in upgradedb
> command.upgrade(config, 'heads')
> File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 174,
> in upgrade
> script.run_env()
> File "/usr/local/lib/python2.7/dist-packages/alembic/script/base.py", line
> 416, in run_env
> util.load_python_file(self.dir, 'env.py')
> File "/usr/local/lib/python2.7/dist-packages/alembic/util/pyfiles.py", line
> 93, in load_python_file
> module = load_module_py(module_id, path)
> File "/usr/local/lib/python2.7/dist-packages/alembic/util/compat.py", line
> 79, in load_module_py
> mod = imp.load_source(module_id, path, fp)
> File "/usr/local/lib/python2.7/dist-packages/airflow/migrations/env.py",
> line 86, in <module>
> run_migrations_online()
> File "/usr/local/lib/python2.7/dist-packages/airflow/migrations/env.py",
> line 81, in run_migrations_online
> context.run_migrations()
> File "<string>", line 8, in run_migrations
> File
> "/usr/local/lib/python2.7/dist-packages/alembic/runtime/environment.py", line
> 807, in run_migrations
> self.get_context().run_migrations(**kw)
> File "/usr/local/lib/python2.7/dist-packages/alembic/runtime/migration.py",
> line 321, in run_migrations
> step.migration_fn(**kw)
> File
> "/usr/local/lib/python2.7/dist-packages/airflow/migrations/versions/cc1e65623dc7_add_max_tries_column_to_task_instance.py",
> line 63, in upgrade
> dag = dagbag.get_dag(ti.dag_id)
> File "/usr/local/lib/python2.7/dist-packages/airflow/models.py", line 232,
> in get_dag
> filepath=orm_dag.fileloc, only_if_updated=False)
> File "/usr/local/lib/python2.7/dist-packages/airflow/models.py", line 249,
> in process_file
> if not os.path.isfile(filepath):
> File "/usr/lib/python2.7/genericpath.py", line 29, in isfile
> st = os.stat(path)
> TypeError: coercing to Unicode: need string or buffer, NoneType found{code}
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