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https://issues.apache.org/jira/browse/AIRFLOW-2939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16728955#comment-16728955
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ASF GitHub Bot commented on AIRFLOW-2939:
-----------------------------------------
yohei1126 commented on pull request #4371: [AIRFLOW-2939][AIRFLOW-3568] fix
TypeError on GoogleCloudStorageToS3Operator / S3ToGoogleCloudStorageOperator
URL: https://github.com/apache/incubator-airflow/pull/4371
### Jira
- [ ] My PR addresses the following [Airflow
Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references
them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
- https://issues.apache.org/jira/browse/AIRFLOW-2939
- https://issues.apache.org/jira/browse/AIRFLOW-3568
- In case you are fixing a typo in the documentation you can prepend your
commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
### Description
- [ ] Here are some details about my PR, including screenshots of any UI
changes:
- A task created by GoogleCloudStorageToS3Operator or
S3ToGoogleCloudStorageOperator always fail due to a type error `TypeError:
'NoneType' object is not iterable`.
- `model.py` tries to push the return value from the operators, which is a
file list as set, to xcom but xcom_push does not support set.
### Tests
- [ ] My PR adds the following unit tests __OR__ does not need testing for
this extremely good reason:
### 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
- [ ] In case of new functionality, my PR adds documentation that describes
how to use it.
- When adding new operators/hooks/sensors, the autoclass documentation
generation needs to be added.
- All the public functions and the classes in the PR contain docstrings
that explain what it does
### Code Quality
- [ ] Passes `flake8`
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> `set` fails in case of `exisiting_files is None` and in case of `json.dumps`
> ----------------------------------------------------------------------------
>
> Key: AIRFLOW-2939
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2939
> Project: Apache Airflow
> Issue Type: Bug
> Components: operators
> Affects Versions: 2.0.0
> Reporter: Kiyoshi Nomo
> Priority: Major
>
> h1. Problems
> h2. TypeError: 'NoneType' object is not iterable
> [https://github.com/apache/incubator-airflow/blob/06b62c42b0b55ea55b86b130317594738d2f36a2/airflow/contrib/operators/gcs_to_s3.py#L91]
>
> {code:java}
> >>> set(None)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: 'NoneType' object is not iterable
> {code}
>
> h2. TypeError: set(['a']) is not JSON serializable
> [https://github.com/apache/incubator-airflow/blob/b78c7fb8512f7a40f58b46530e9b3d5562fe84ea/airflow/models.py#L4483]
>
> {code:python}
> >>> json.dumps(set(['a']))
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/usr/local/opt/pyenv/versions/2.7.11/lib/python2.7/json/__init__.py",
> line 244, in dumps
> return _default_encoder.encode(obj)
> File "/usr/local/opt/pyenv/versions/2.7.11/lib/python2.7/json/encoder.py",
> line 207, in encode
> chunks = self.iterencode(o, _one_shot=True)
> File "/usr/local/opt/pyenv/versions/2.7.11/lib/python2.7/json/encoder.py",
> line 270, in iterencode
> return _iterencode(o, 0)
> File "/usr/local/opt/pyenv/versions/2.7.11/lib/python2.7/json/encoder.py",
> line 184, in default
> raise TypeError(repr(o) + " is not JSON serializable")
> TypeError: set(['a']) is not JSON serializable
> {code}
>
> h1. Solution
> * Check that the existing fils is not None.
> * Convert it to the `set` and return it to the `list` after get to the
> difference of files.
> {code:python}
> if existing_files is not None:
> files = list(set(files) - set(existing_files))
> {code}
>
>
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