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https://issues.apache.org/jira/browse/AIRFLOW-3036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16629949#comment-16629949
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Ash Berlin-Taylor commented on AIRFLOW-3036:
--------------------------------------------
This is going to need someone who is familiar with MySQL handling of timestamp
and datetime columsn to experiment and check that Mysql does right things with
these columns, even if the TZ of the db server is set to something other than
UTC, and to make sure that it doesn't play silly games with default values
(which is what the setting we require turns off)
> Upgrading to Airflow 1.10 not possible using GCP Cloud SQL for MYSQL
> --------------------------------------------------------------------
>
> Key: AIRFLOW-3036
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3036
> Project: Apache Airflow
> Issue Type: Bug
> Components: core, db
> Affects Versions: 1.10.0
> Environment: Google Cloud Platform, Google Kubernetes Engine, Airflow
> 1.10 on Debian Stretch, Google Cloud SQL MySQL
> Reporter: Smith Mathieu
> Priority: Blocker
> Labels: 1.10, google, google-cloud-sql
>
> The upgrade path to airflow 1.10 seems impossible for users of MySQL in
> Google's Cloud SQL service given new mysql requirements for 1.10.
>
> When executing "airflow upgradedb"
> ```
> INFO [alembic.runtime.migration] Running upgrade d2ae31099d61 ->
> 0e2a74e0fc9f, Add time zone awareness
> Traceback (most recent call last):
> File "/usr/local/bin/airflow", line 32, in <module>
> args.func(args)
> File "/usr/local/lib/python3.6/site-packages/airflow/bin/cli.py", line 1002,
> in initdb
> db_utils.initdb(settings.RBAC)
> File "/usr/local/lib/python3.6/site-packages/airflow/utils/db.py", line 92,
> in initdb
> upgradedb()
> File "/usr/local/lib/python3.6/site-packages/airflow/utils/db.py", line 346,
> in upgradedb
> command.upgrade(config, 'heads')
> File "/usr/local/lib/python3.6/site-packages/alembic/command.py", line 174,
> in upgrade
> script.run_env()
> File "/usr/local/lib/python3.6/site-packages/alembic/script/base.py", line
> 416, in run_env
> util.load_python_file(self.dir, 'env.py')
> File "/usr/local/lib/python3.6/site-packages/alembic/util/pyfiles.py", line
> 93, in load_python_file
> module = load_module_py(module_id, path)
> File "/usr/local/lib/python3.6/site-packages/alembic/util/compat.py", line
> 68, in load_module_py
> module_id, path).load_module(module_id)
> File "<frozen importlib._bootstrap_external>", line 399, in
> _check_name_wrapper
> File "<frozen importlib._bootstrap_external>", line 823, in load_module
> File "<frozen importlib._bootstrap_external>", line 682, in load_module
> File "<frozen importlib._bootstrap>", line 265, in _load_module_shim
> File "<frozen importlib._bootstrap>", line 684, in _load
> File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
> File "<frozen importlib._bootstrap_external>", line 678, in exec_module
> File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
> File "/usr/local/lib/python3.6/site-packages/airflow/migrations/env.py",
> line 91, in <module>
> run_migrations_online()
> File "/usr/local/lib/python3.6/site-packages/airflow/migrations/env.py",
> line 86, in run_migrations_online
> context.run_migrations()
> File "<string>", line 8, in run_migrations
> File
> "/usr/local/lib/python3.6/site-packages/alembic/runtime/environment.py", line
> 807, in run_migrations
> self.get_context().run_migrations(**kw)
> File "/usr/local/lib/python3.6/site-packages/alembic/runtime/migration.py",
> line 321, in run_migrations
> step.migration_fn(**kw)
> File
> "/usr/local/lib/python3.6/site-packages/airflow/migrations/versions/0e2a74e0fc9f_add_time_zone_awareness.py",
> line 46, in upgrade
> raise Exception("Global variable explicit_defaults_for_timestamp needs to be
> on (1) for mysql")
> Exception: Global variable explicit_defaults_for_timestamp needs to be on
> (1) for mysql
> ```
>
> Reading documentation for upgrading to airflow 1.10, it seems the requirement
> for explicit_defaults_for_timestamp=1 was intentional.
>
> However, MySQL on Google Cloud SQL does not support configuring this
> variable and it is off by default. Users of MySQL and Cloud SQL do not have
> an upgrade path to 1.10. Alas, so close to the mythical Kubernetes Executor.
> In GCP, Cloud SQL is _the_ hosted MySQL solution.
> [https://cloud.google.com/sql/docs/mysql/flags]
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