#30636: mysqldump errors out with "unknown variable" when --parallel and
--defaults-file
-------------------------------------+-------------------------------------
Reporter: fallen | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: master
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
What happens?
Running tests gives:
Creating test database for alias 'default'...
Cloning test database for alias 'default'...
mysqldump: unknown variable 'defaults-
file=/var/lib/jenkins/workspace/Pytition_master/my.cnf'
And then every test fails with 'E' (error).
How to reproduce?
1/ Configure your database like this:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'OPTIONS': {
'read_default_file': '/path/to/my.cnf', # file with
credentials and db name
},
}
}
2/ run tests with "manage.py test --parallel 2 appname"
The important here is "--parallel 2" (or more than 2)
Explanations?
This happens because Django tries to clone the database using mysqldump:
https://github.com/django/django/blob/master/django/db/backends/mysql/creation.py#L60
In my case I've printed the arguments, it gives:
dump_cmd: ['mysqldump', '--routines', '--events', '--defaults-
file=/var/lib/jenkins/workspace/Pytition_master/my.cnf', 'test_']
load_cmd: ['mysql', '--defaults-
file=/var/lib/jenkins/workspace/Pytition_master/my.cnf', 'test__1']
mysqldump: unknown variable 'defaults-
file=/var/lib/jenkins/workspace/Pytition_master/my.cnf'
However, it seems that, even if this is undocumented in mysqldump's man
page, it does only support --defaults-file parameter when in first
position.
See the Note on this StackOverflow answer:
https://stackoverflow.com/questions/10725209/specifying-separate-config-
file-on-mysqldump-command-line
Proposed solution:
Test if read_default_file is in settings, and in this case put it as first
argument to mysqldump
--
Ticket URL: <https://code.djangoproject.com/ticket/30636>
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