GAE ImportError: dynamic module does not define init function (init_mysql)

Question

My staging GAE app throws the below err,

File "/base/data/home/apps/foo156801/worker:20170301t222555.399535951340506041/lib/MySQLdb/__init__.py", line 19, in <module>
import _mysql
ImportError: dynamic module does not define init function (init_mysql)

which was exactly same as this. According to the answer given on that link, I have changed my app.yaml MysqlDb version and the local mysqldb version to points to a same version. But no luck. Still I got the above error.

app.yaml

libraries:
 - name: jinja2
   version: latest
 - name: MySQLdb
   version: "1.2.5"

requirements.txt

Flask-API==0.6.9
MySQL-python==1.2.5

No, I made the requirements.txt file for to installing third party packages into lib folder. ie, pip install -r requirements.txt -t lib — Avinash Raj
– Avinash Raj, Commented Mar 2, 2017 at 4:58
If I remove mysqldb package from my lib folder with the builtin mysqldb entry exists, it shows No module named MySQLdb. And if I remove the builtin entry and the mysqldb package still exists on my lib folder then it shows the above error. — Avinash Raj
– Avinash Raj, Commented Mar 2, 2017 at 5:10
@Dan But queries on default module works perfectly file.. But the db queries on worker module or service throws the above exception. I have /api/users/list endpoint on my default module which gets all the users from the database.. It works just fine.. — Avinash Raj
– Avinash Raj, Commented Mar 3, 2017 at 7:13
But on the another api, I have set the default module to call a task which actually exists on worker module, say /send-email in worker.py . In this handler I added a query to search in one of my tables . This causes error. — Avinash Raj
– Avinash Raj, Commented Mar 3, 2017 at 7:16

Community · Accepted Answer · 2017-05-23 10:29:54Z

1

The multiple services/modules of an application do not share any code, see Service isolation.

Because of this requesting runtime-provided libraries or vendoring in 3rd party libraries needs to be replicated in each service/module.

Symlinks can also be used for vendoring in 3rd party libs in DRY spirit, see Sharing entities between App Engine modules.

edited May 23, 2017 at 10:29

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answered Mar 3, 2017 at 7:46

Dan Cornilescu

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4 Comments

Avinash Raj Over a year ago

So it won't share also the environment variables? Like in the default module , i set foo: bar in app.yaml. Can I access that env variable in worker.py os.environ.get('foo', 'None'). Is this would return None?

Dan Cornilescu Over a year ago

Yep, worker.yaml needs its instructions as well. This may help: stackoverflow.com/questions/33307128/…

Dan Cornilescu Over a year ago

Fundamentally the modules are completely isolated from the code prospective, the worker module could be a flex env module, written in another language, with a totally different style of configurations.

Avinash Raj Over a year ago

ya, I already tested worker module completely written in php lang.

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