Yes, it is fully populated as are the _comment_id fields needed for joins.

Brooke Storm
Operations Engineer
Wikimedia Cloud Services
bst...@wikimedia.org <mailto:bst...@wikimedia.org>
IRC: bstorm_

> On Mar 7, 2019, at 11:21 AM, Jesse Plamondon-Willard <pathosch...@gmail.com> 
> wrote:
> 
> Is the comment table fully populated, so we can migrate tools immediately?
> 
> -- 
> Pathoschild (Jesse)
> 
> On Thu, 7 Mar 2019 at 12:54, Brooke Storm <bst...@wikimedia.org 
> <mailto:bst...@wikimedia.org>> wrote:
> After some discussion, we are moving back the date by a week to 3/19/2019 for 
> people to have a bit more time to update tools and such.
> Thanks everyone!
> 
> Brooke Storm
> Operations Engineer
> Wikimedia Cloud Services
> bst...@wikimedia.org <mailto:bst...@wikimedia.org>
> IRC: bstorm_
> 
>> On Mar 7, 2019, at 9:13 AM, Brooke Storm <bst...@wikimedia.org 
>> <mailto:bst...@wikimedia.org>> wrote:
>> 
>> Since the MCR refactor of the Mediawiki database schema has been progressing 
>> (https://phabricator.wikimedia.org/T166733 
>> <https://phabricator.wikimedia.org/T166732> and many other tickets), one of 
>> the last steps is dropping the columns from the wiki replica schema.
>> 
>> The column drops are being tracked and are explained well here 
>> https://phabricator.wikimedia.org/T212972 
>> <https://phabricator.wikimedia.org/T212972>, and currently the change is 
>> ready to be applied.  It is already applied to two wikis (eswiki and huwiki 
>> since there was a column problem that needed fixing).  The tables with names 
>> such as <tablename>_compat will retain a similar structure if that is needed 
>> for refactoring.
>> 
>> From the ticket, this is a summary of what is changing, organized by table 
>> name:
>> archive: Remove ar_comment
>> archive_userindex: Remove ar_comment
>> filearchive:
>> Remove fa_deleted_reason
>> Remove fa_description
>> filearchive_userindex:
>> Remove fa_deleted_reason
>> Remove fa_description
>> image: Remove img_description
>> ipblocks: Remove ipb_reason.
>> ipblocks_ipindex: Remove ipb_reason.
>> logging: Remove log_comment.
>> logging_logindex: Remove log_comment.
>> logging_userindex: Remove log_comment.
>> oldimage: Remove oi_description
>> oldimage_userindex: Remove oi_description
>> recentchanges: Remove rc_comment.
>> recentchanges_userindex: Remove rc_comment.
>> revision: Remove rev_comment.
>> revision_userindex: Remove rev_comment.
>> 
>> The changes to the _compat tables should not affect anything.
>> 
>> We will deploy the change early next week (Tuesday - 3/12/2019).  In most 
>> cases, if a table isn’t working for your tool or app anymore because of the 
>> change, you can switch to a table named $tablename_compat and it will appear 
>> to have the same schema, but it is recommended that comment references use a 
>> join to the new comment table on a “comment_id” field instead where possible.
>> 
>> Brooke Storm
>> Operations Engineer
>> Wikimedia Cloud Services
>> bst...@wikimedia.org <mailto:bst...@wikimedia.org>
>> IRC: bstorm_
>> 
> 
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