[Pulp-dev] Database support in Pulp 3

[Dennis Kliban]

+1 to drop support for mariadb

On Mon, Jul 15, 2019 at 10:04 AM Austin Macdonald <amacdona at redhat.com>
wrote:

> +1 to remove.
>
> On Sun, Jul 14, 2019 at 4:10 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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>>>>
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