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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-618) Python SDKs writes non RFC compliant JSON files for BQ Export
Date Mon, 12 Sep 2016 18:56:20 GMT

    [ https://issues.apache.org/jira/browse/BEAM-618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15484968#comment-15484968
] 

ASF GitHub Bot commented on BEAM-618:
-------------------------------------

GitHub user ajamato opened a pull request:

    https://github.com/apache/incubator-beam/pull/947

    [BEAM-618] Disallow NAN, INF and -INF invalid JSON values in bigquery exporter

    Be sure to do all of the following to help us incorporate your contribution
    quickly and easily:
    
     - [ ] Make sure the PR title is formatted like:
       `[BEAM-<Jira issue #>] Description of pull request`
     - [ ] Make sure tests pass via `mvn clean verify`. (Even better, enable
           Travis-CI on your fork and ensure the whole test matrix passes).
     - [ ] Replace `<Jira issue #>` in the title with the actual Jira issue
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     - [ ] If this contribution is large, please file an Apache
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    ---
    
    Now exporting JSON will fail with invalid NAN, INF or -INF values.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ajamato/incubator-beam py_json

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-beam/pull/947.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #947
    
----
commit 442bed71e68524368408573ce0bcb22901d7f861
Author: Alex Amato <ajamato@ajamato2016.sea.corp.google.com>
Date:   2016-09-09T00:57:28Z

    Set allow_nan=False on bigquery JSON encoding

----


> Python SDKs writes non RFC compliant JSON files for BQ Export
> -------------------------------------------------------------
>
>                 Key: BEAM-618
>                 URL: https://issues.apache.org/jira/browse/BEAM-618
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py
>            Reporter: Alex Amato
>            Assignee: Frances Perry
>
> Python SDK uses the built in json.dumps to write JSON files to GCS for the BQ Exporter.
BigQuery can fail to parse these files when it tries to load these files into a BQ table because
json.dumps can export JSON which does not conform to the IEEE RFC.
> There are a few cases which are not RFC compilant listed in that module.
> https://docs.python.org/2/library/json.html#standard-compliance-and-interoperability
> The main issue we run into is the NAN, INF and -INF values.
> These fails with a confusing error (and we delete the GCS files making it hard to debug):
> JSON table encountered too many errors, giving up. Rows JSON parsing error in row starting
at position
> We can set the allow_nan argument to json.dumps to false to address these issues. So
that when a user tries to write a file with INF, -INF or NAN
> Setting this argument will produce this type of error when json.dumps is called with
NAN/INF values. We may want to catch this error to mention the fact that INF and NAN are not
allowed.
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.7/json/__init__.py", line 250, in dumps
>     sort_keys=sort_keys, **kw).encode(obj)
>   File "/usr/lib/python2.7/json/encoder.py", line 207, in encode
>     chunks = self.iterencode(o, _one_shot=True)
>   File "/usr/lib/python2.7/json/encoder.py", line 270, in iterencode
>     return _iterencode(o, 0)
> ValueError: Out of range float values are not JSON compliant



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