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Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2019/07/15 15:17:01 UTC
[GitHub] [airflow] dszakallas opened a new pull request #5592:
[AIRFLOW-4867] migration script should check if table exists
dszakallas opened a new pull request #5592: [AIRFLOW-4867] migration script should check if table exists
URL: https://github.com/apache/airflow/pull/5592
Make sure you have checked _all_ steps below.
### Jira
- [x] My PR addresses the following [AIRFLOW-4867](https://issues.apache.org/jira/browse/AIRFLOW-4867) issues and references them in the PR title.
### Description
- [x] Here are some details about my PR, including screenshots of any UI changes:
needed to downgrade to Airflow 1.10.2 (db head rev 41f5f12752f8) from Airflow 1.10.4b2 (db head rev 004c1210f153).
When running
```
alembic downgrade 41f5f12752f8
```
I faced the following error
```
INFO [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO [alembic.runtime.migration] Will assume transactional DDL.
[2019-06-28 20:28:02,375] {migration.py:357} INFO - Running downgrade 004c1210f153 -> 939bb1e647c8, increase queue name size limit
[2019-06-28 20:28:03,719] {migration.py:357} INFO - Running downgrade 939bb1e647c8 -> 4ebbffe0a39a, task reschedule fk on cascade delete
[2019-06-28 20:28:04,241] {migration.py:357} INFO - Running downgrade 4ebbffe0a39a -> dd4ecb8fbee3, cf5dc11e79ad, a56c9515abdc, Merge heads
[2019-06-28 20:29:22,124] {migration.py:357} INFO - Running downgrade dd4ecb8fbee3 -> c8ffec048a3b, Add schedule interval to dag
[2019-06-28 20:29:22,468] {migration.py:357} INFO - Running downgrade cf5dc11e79ad -> 41f5f12752f8, drop_user_and_chart
Traceback (most recent call last):
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1244, in _execute_context
cursor, statement, parameters, context
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 550, in do_execute
cursor.execute(statement, parameters)
psycopg2.errors.DuplicateTable: relation "users" already exists
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/bin/alembic", line 11, in <module>
load_entry_point('alembic==1.0.11', 'console_scripts', 'alembic')()
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/config.py", line 540, in main
CommandLine(prog=prog).main(argv=argv)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/config.py", line 534, in main
self.run_cmd(cfg, options)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/config.py", line 514, in run_cmd
**dict((k, getattr(options, k, None)) for k in kwarg)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/command.py", line 317, in downgrade
script.run_env()
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/script/base.py", line 475, in run_env
util.load_python_file(self.dir, "env.py")
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/util/pyfiles.py", line 90, in load_python_file
module = load_module_py(module_id, path)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/util/compat.py", line 177, in load_module_py
spec.loader.exec_module(module)
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "migrations/env.py", line 75, in <module>
run_migrations_online()
File "migrations/env.py", line 69, in run_migrations_online
context.run_migrations()
File "<string>", line 8, in run_migrations
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/runtime/environment.py", line 839, in run_migrations
self.get_context().run_migrations(**kw)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/runtime/migration.py", line 362, in run_migrations
step.migration_fn(**kw)
File "/Users/dszakallas/Projects/airflow/airflow/migrations/versions/cf5dc11e79ad_drop_user_and_chart.py", line 66, in downgrade
sa.UniqueConstraint('username')
File "<string>", line 8, in create_table
File "<string>", line 3, in create_table
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/operations/ops.py", line 1248, in create_table
return operations.invoke(op)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/operations/base.py", line 345, in invoke
return fn(self, operation)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/operations/toimpl.py", line 101, in create_table
operations.impl.create_table(table)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/ddl/impl.py", line 252, in create_table
self._exec(schema.CreateTable(table))
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/alembic/ddl/impl.py", line 134, in _exec
return conn.execute(construct, *multiparams, **params)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 988, in execute
return meth(self, multiparams, params)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/sql/ddl.py", line 72, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1050, in _execute_ddl
compiled,
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1248, in _execute_context
e, statement, parameters, cursor, context
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1466, in _handle_dbapi_exception
util.raise_from_cause(sqlalchemy_exception, exc_info)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 399, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 153, in reraise
raise value.with_traceback(tb)
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1244, in _execute_context
cursor, statement, parameters, context
File "/Users/dszakallas/.pyenv/versions/3.6.6/envs/pds-airflow/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 550, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.errors.DuplicateTable) relation "users" already exists
[SQL:
CREATE TABLE users (
id SERIAL NOT NULL,
69 sa.UniqueConstraint('username')
username VARCHAR(250),
email VARCHAR(500),
password VARCHAR(255),
superuser BOOLEAN,
PRIMARY KEY (id),
UNIQUE (username)
)
]
(Background on this error at: http://sqlalche.me/e/f405)
```
I 'fixed' the migration script with only creating the tables if they exist:
After this fix the migrations successfully ran for me.
### Tests
- [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
I don't think this can be unit tested.
### Commits
- [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
1. Subject is separated from body by a blank line
1. Subject is limited to 50 characters (not including Jira issue reference)
1. Subject does not end with a period
1. Subject uses the imperative mood ("add", not "adding")
1. Body wraps at 72 characters
1. Body explains "what" and "why", not "how"
### Documentation
- [x] In case of new functionality, my PR adds documentation that describes how to use it.
- All the public functions and the classes in the PR contain docstrings that explain what it does
- If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
### Code Quality
- [x] Passes `flake8`
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