Sadly, there is virtually no help for CentralAuth. You'll likely get told to 
use a shared users table.

I had an issue months ago that no one helped with.

> On 22 Sep 2016, at 03:22 pm, "Till Kraemer" <i...@till-kraemer.com> wrote:
> 
> P.S.: I also created the user User on the datawiki and tried to rename
> him to টিল via Special:RenameUser but that resulted in the same error :/
> 
> 
>> On 9/21/2016 5:33 PM, Till Kraemer wrote:
>> Hi,
>> 
>> I'm running a little pool wiki for files, a data wiki for, well data,
>> and several language wikis (MediaWiki 1.27.1).
>> 
>> Users টিল and Till have accounts on enwiki. I can create a local user
>> টিল on poolwiki via createLocalAccount.php with no problems. I also can
>> create a local user Till on datawiki without any trouble, but when I try
>> to create টিল on datawiki, I'm getting the following error:
>> 
>> A database query error has occurred.
>> Query: SELECT
>> gu_id,gu_name,lu_wiki,gu_salt,gu_password,gu_auth_token,gu_locked,gu_hidden,gu_registration,gu_email,gu_email_authenticated,gu_home_db,gu_cas_token
>> FROM `globaluser` LEFT OUTER JOIN `localuser` ON ((gu_name=lu_name) AND
>> lu_wiki = 'datawiki')  WHERE gu_name = 'টিল'  LIMIT 1
>> Function: CentralAuthUser::loadState
>> Error: 1267 Illegal mix of collations (latin1_bin,IMPLICIT) and
>> (utf8_general_ci,COERCIBLE) for operation '=' (127.0.0.1)
>> 
>> Table globaluser on database centralauth looks like this:
>> 
>> | Field                        | Type             | Collation         |
>> +------------------------------+------------------+-------------------+
>> | gu_id                        | int(11)          | NULL              |
>> | gu_name                      | varchar(255)     | latin1_bin        |
>> | gu_enabled                   | varchar(14)      | latin1_swedish_ci |
>> | gu_enabled_method            | enum('opt-in',   | latin1_swedish_ci |
>> |                              |'batch','auto',   |                   |
>> |                              |'admin')          |                   |
>> | gu_home_db                   | varchar(255)     | latin1_bin        |
>> | gu_email                     | varchar(255)     | latin1_bin        |
>> | gu_email_authenticated       | char(14)         | latin1_bin        |
>> | gu_salt                      | varchar(16)      | latin1_bin        |
>> | gu_password                  | tinyblob         | NULL              |
>> | gu_locked                    | tinyint(1)       | NULL              |
>> | gu_hidden                    | varbinary(255)   | NULL              |
>> | gu_registration              | varchar(14)      | latin1_bin        |
>> | gu_password_reset_key        | tinyblob         | NULL              |
>> | gu_password_reset_expiration | varchar(14)      | latin1_bin        |
>> | gu_auth_token                | varbinary(32)    | NULL              |
>> | gu_cas_token                 | int(10) unsigned | NULL              |
>> 
>> I tried to do things like ALTER TABLE `globaluser` MODIFY
>> `gu_password_reset_expiration` varchar(14) CHARACTER SET utf8 COLLATE
>> utf8_bin; but that doesn't work with gu_name:
>> 
>> ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
>> 
>> I can do gu_name varchar(200), but I'm probably not supposed to do that.
>> 
>> I also can change gu_name varchar(255) to utf8_bin in a freshly created
>> centralauth database, but not in the one that is already populated with
>> my users.
>> 
>> Exporting the old centralauth database, changing gu_name to utf8_bin in
>> an editor and importing it, doesn't work either: same error as mentioned
>> above.
>> 
>> How can I fix this?
>> 
>> I'm running MariaDB 10.0.25 which seem to use XtraDB by default. Would
>> it help to switch to InnoDB?
>> 
>> And: my latest language wikis have $wgDBTableOptions = "ENGINE=InnoDB,
>> DEFAULT CHARSET=binary"; so I changed the old wikis from
>> $wgDBTableOptions   = "TYPE=InnoDB"; in LocalSettings.php to the
>> settings of the new wikis. I don't know if that's a problem.
>> 
>> Aside from the problems mentioned above, should I change every database
>> and table of the old wikis from latin1_bin to utf8_bin, so that they are
>> in line with the new MediaWiki installations?
>> 
>> Any help is more than welcome!
>> 
>> Thanks and cheers,
>> 
>> Till
> 
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