[openstack-dev] [Solum] MySQL Storage Engine

Paul Montgomery paul.montgomery at RACKSPACE.COM
Wed Dec 4 21:23:30 UTC 2013

With the comments that we've received, I would recommend that Clayton
remove the option to select the MySQL storage engine from Oslo config and
just "hardcode" InnoDB.  I believe it entails just removing a few lines of
code.  It doesn't sound like anyone has a reason to use any other storage
engine at this point.  Sound good?  I can update my review if that is the
path that we want to take.

(You can see the area in the code at this link under my comment:

On 12/4/13 3:06 PM, "Adrian Otto" <adrian.otto at rackspace.com> wrote:

>On Dec 4, 2013, at 12:32 PM, Monty Taylor <mordred at inaugust.com> wrote:
>> On 12/04/2013 03:25 PM, Clint Byrum wrote:
>>> Excerpts from Paul Montgomery's message of 2013-12-04 12:04:06 -0800:
>>>> TLDR: Should Solum log a warning if operators do not use the InnoDB
>>>> storage engine with MySQL in Solum's control plane?
>>>> Details:
>>>> I was looking at: https://review.openstack.org/#/c/57024/
>>>> Models.py to be specific.
>>>> The default storage engine is InnoDB for MySQL which is good.  I took
>>>> quick look at the storage engines and only InnoDB seems reasonable
>>>>for the
>>>> Solum control plane (it is ACID complaint).  I assume that we'll all
>>>> coding towards an ACID compliant database for performance (not having
>>>> revalidate database writes and consistency and such) and ease of
>>>> development.
>>>> If all of that is true, should we log a warning to the operator that
>>>> are using an untested and potentially problematic storage engine
>>>>(which in
>>>> a worst case scenario can corrupt their data)?  Should we even enable
>>>> operator to change the storage engine through configuration?  I think
>>>> enabling that configuration is fine as long as we make sure that the
>>>> operator knows that they are on their own with this unsupported
>>>> configuration but I welcome thoughts from the group on this topic.
>>> Just assume MyISAM _does not exist_. It is 2013 for crying out loud.
>>> If somebody accidentally uses MyISAM, point at them and laugh, but then
>>> do help them pick up the pieces when it breaks.
>>> In all seriousness, if you can force the engine to InnoDB, do that.
>>> Otherwise, just ignore this. We are all consenting adults here and if
>>> people cant' RTFM on MySQL, they shouldn't be storing data in it.
>> +1000
>So are you suggesting we have a bit of database code in Solum that would
>quickly check the Engine of each table upon startup. Something like:
>Šand iterate the Engine column looking for anything not InnoDB, and
>logging a warning error if other values are found?
>Or, are you suggesting that we just trust people not to be fools, and
>leave this subject alone completely?
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