[Pulp-dev] Database support in Pulp 3

Ina Panova ipanova at redhat.com
Mon Jul 15 14:40:36 UTC 2019

+1 to drop MariaDB support.


Ina Panova
Senior Software Engineer| Pulp| Red Hat Inc.

"Do not go where the path may lead,
 go instead where there is no path and leave a trail."

On Sun, Jul 14, 2019 at 10:10 PM Brian Bouterse <bbouters at redhat.com> wrote:

> I believe we have reached a point where Pulp (core and its plugins) can no
> longer support MariaDB due to technical problems. I've been an advocate for
> Pulp to support MariaDB because it's what our users want. The community
> survey has 16 respondents (IIRC) and 30% of them said they wanted to use
> MariaDB. Also, anecdotally at conference booths, users want choice in their
> database. To not give them that, we need good, technical reasons. I didn't
> feel we had enough of them before, but now I feel we're at a point where we
> aren't able to solve these issues; it's becoming a choice of giving users
> features they want versus db portability.
> Here are the main reasons I think about (mostly what others have also
> stated):
> * utf8 issues - 3-byte utf-8 issues   <---- is this fixable with just a
> schema change?
> * full text search - pulp_ansible recently implemented full text search.
> To my knowledge it's not possible with MySQL. full text search is amazing,
> and it's driving pulp_ansible to drop postgreSQL. I bet all plugins will
> want this. With MariaDB, there is no search.
> * mixed plugin support concerns - With some plugins dropping support for
> MariaDB, the pulp community will fracture based on what DB you choose to
> use because not all plugins can run in all places.
> * specific field support - plugin writers have expressed the desire to
> store json data when their plugins natively contain json data and perhaps
> you want to filter on it for example. Having mariaDB support prevents us
> from using the JSONField.
> * performance concerns - The performance testing showed that Pulp does run
> significantly slower
> If we drop MariaDB we should publish a blog post and drop it with RC4. To
> remove MariaDB testing from Travis I propose we remove it from the
> plugin_template and use the Travis CI tool from @dkliban to push that
> config out to all repositories.
> I'll be offline this week. I wanted to get this reply out there in the
> hope that you all can make and enact the final decision.
> Thanks,
> Brian
> On Thu, Jul 11, 2019 at 4:02 PM Daniel Alley <dalley at redhat.com> wrote:
>> One more note:  Not all MySQL / MariaDB installations support
>> transactions, which we use heavily (and rely on?)
>> https://docs.djangoproject.com/en/2.2/topics/db/transactions/#transactions-in-mysql
>> On Thu, Jul 11, 2019 at 3:55 PM David Davis <daviddavis at redhat.com>
>> wrote:
>>> Two plugins are currently running into issues trying to support
>>> mariadb/mysql. The pulp_ansible plugin is interested in adding full text
>>> search and JSONFields. Meanwhile, the pulp_python plugin is trying to store
>>> emojis in text which mariadb/mysql doesn't handle well since it uses 3-byte
>>> utf-8 by default[0]. Given such cases, I wonder if we'd be better served by
>>> dropping mariadb/mysql support and going with Postgresql only. Gitlab
>>> recently came to a similar conclusion[1].
>>> I personally am hesitant to give up being database agnostic but we
>>> already don't support sqlite. Also, I see some advantages like utilizing
>>> several Postgresql-only features like extra field types, full text search,
>>> etc. Also, supporting multiple databases means we'll likely have to write
>>> db specific code in some places or have plugins that only work with certain
>>> database types.
>>> Thoughts?
>>> [0]
>>> https://medium.com/@adamhooper/in-mysql-never-use-utf8-use-utf8mb4-11761243e434
>>>      https://code.djangoproject.com/ticket/18392
>>> [1] https://about.gitlab.com/2019/06/27/removing-mysql-support/
>>> David
>>> _______________________________________________
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>>> Pulp-dev at redhat.com
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