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From "Matthias Huschle (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AIRFLOW-1405) Airflow v 1.8.1 unable to properly initialize with MySQL
Date Tue, 01 Aug 2017 10:07:02 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-1405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108677#comment-16108677
] 

Matthias Huschle commented on AIRFLOW-1405:
-------------------------------------------

MySQL supports fractional seconds only from version 5.6.4 on. You can not use airflow >=
1.8 with earlier versions.

See also [https://issues.apache.org/jira/browse/AIRFLOW-748]

> Airflow v 1.8.1 unable to properly initialize with MySQL
> --------------------------------------------------------
>
>                 Key: AIRFLOW-1405
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1405
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: db
>    Affects Versions: 1.8.1
>         Environment: CentOS7
>            Reporter: Aakash Bhardwaj
>             Fix For: 1.8.1
>
>         Attachments: error_log.txt
>
>
> While working on a CentOS7 system, I was trying to configure Airflow version 1.8.1 to
run with MySql in the backend.
> I have installed Airflow in a Virtual Environment, and the MySQL has a database named
airflow (default).
> But on running the command -
> {code:none}
> airflow initdb
> {code}
> the following error is reported
> {noformat}
> [2017-07-12 13:22:36,558] {__init__.py:57} INFO - Using executor LocalExecutor
> DB: mysql://airflow:***@localhost/airflow
> [2017-07-12 13:22:37,218] {db.py:287} INFO - Creating tables
> INFO  [alembic.runtime.migration] Context impl MySQLImpl.
> INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
> INFO  [alembic.runtime.migration] Running upgrade f2ca10b85618 -> 4addfa1236f1, Add
fractional seconds to mysql tables
> Traceback (most recent call last):
>   File "/opt/airflow_virtual_environment/airflow_venv/bin/airflow", line 28, in <module>
>     args.func(args)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/airflow/bin/cli.py",
line 951, in initdb
>     db_utils.initdb()
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/airflow/utils/db.py",
line 106, in initdb
>     upgradedb()
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/airflow/utils/db.py",
line 294, in upgradedb
>     command.upgrade(config, 'heads')
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/command.py",
line 174, in upgrade
>     script.run_env()
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/script/base.py",
line 416, in run_env
>     util.load_python_file(self.dir, 'env.py')
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/util/pyfiles.py",
line 93, in load_python_file
>     module = load_module_py(module_id, path)
>   File "/opt/airflow_virtual_environment/airflow_venv/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/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/airflow/migrations/env.py",
line 86, in <module>
>     run_migrations_online()
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/airflow/migrations/env.py",
line 81, in run_migrations_online
>     context.run_migrations()
>   File "<string>", line 8, in run_migrations
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/runtime/environment.py",
line 807, in run_migrations
>     self.get_context().run_migrations(**kw)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/runtime/migration.py",
line 321, in run_migrations
>     step.migration_fn(**kw)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/airflow/migrations/versions/4addfa1236f1_add_fractional_seconds_to_mysql_tables.py",
line 36, in upgrade
>     op.alter_column(table_name='dag', column_name='last_scheduler_run', type_=mysql.DATETIME(fsp=6))
>   File "<string>", line 8, in alter_column
>   File "<string>", line 3, in alter_column
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/operations/ops.py",
line 1420, in alter_column
>     return operations.invoke(alt)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/operations/base.py",
line 318, in invoke
>     return fn(self, operation)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/operations/toimpl.py",
line 53, in alter_column
>     **operation.kw
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/ddl/mysql.py",
line 67, in alter_column
>     else existing_autoincrement
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/alembic/ddl/impl.py",
line 118, in _exec
>     return conn.execute(construct, *multiparams, **params)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
line 945, in execute
>     return meth(self, multiparams, params)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/sql/ddl.py",
line 68, in _execute_on_connection
>     return connection._execute_ddl(self, multiparams, params)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
line 1002, in _execute_ddl
>     compiled
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
line 1189, in _execute_context
>     context)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
line 1402, in _handle_dbapi_exception
>     exc_info
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/util/compat.py",
line 203, in raise_from_cause
>     reraise(type(exception), exception, tb=exc_tb, cause=cause)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/engine/base.py",
line 1182, in _execute_context
>     context)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/sqlalchemy/engine/default.py",
line 470, in do_execute
>     cursor.execute(statement, parameters)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/MySQLdb/cursors.py",
line 205, in execute
>     self.errorhandler(self, exc, value)
>   File "/opt/airflow_virtual_environment/airflow_venv/lib/python2.7/site-packages/MySQLdb/connections.py",
line 36, in defaulterrorhandler
>     raise errorclass, errorvalue
> sqlalchemy.exc.ProgrammingError: (_mysql_exceptions.ProgrammingError) (1064, "You have
an error in your SQL syntax; check the manual that corresponds to your MySQL server version
for the right syntax to use near '(6) NULL' at line 1") [SQL: u'ALTER TABLE dag MODIFY last_scheduler_run
DATETIME(6) NULL']
> {noformat}
> Please note that airflow is able to connect to the DB, as new tables are created in the
airflow database, but this query is not working.
> Airflow version=1.8.1
> MySQL version = Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline
5.1



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