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Re: bb-10.2-compatibility - processlist


On 31.03.2017 15:17, jerome brauge wrote:

Using connectionAttributes is not possible in case where you use a connection pool ...

Dunno. Personally, I do not see it as impossible, and would like ApplicationName, ClientUser, ClientHostname for all clientside-pooled connections with the given connection URL stay the same. But perhaps your case is special, and you like to change user or applicationName on the fly. This would not work of course with session connection attributes.

*De :*Vladislav Vaintroub [mailto:vvaintroub@xxxxxxxxx]
*Envoyé :* vendredi 31 mars 2017 14:44
*À :* jerome brauge; Diego Dupin
*Cc :* MariaDB Developers (maria-developers@xxxxxxxxxxxxxxxxxxx)
*Objet :* Re: [Maria-developers] bb-10.2-compatibility - processlist

On 31.03.2017 14:35, jerome brauge wrote:


    It’s weird to implement setClientInfo without provide a way to see
    values (MySql Connector J only put values in a hashtable, I do not
    know what it is for !)

    On Oracle, Sybase, SQLServer and DB2, these values are pushed in
    processes system view.

https://dev.mysql.com/doc/refman/5.6/en/session-connect-attrs-table.html is actually something like that, and both MySQL and MariaDB drivers support connectionAttributes in the connection URL, so maybe it is something that you can use.

It is weird that these client connection attributes are tied to performance schema, that can be switched off during runtime, or during compilation. I'd rather have it in the information schema, that cannot be switched off. Maybe it is something that we need to fix.

As much as possible, we want avoid to use one solution per database vendor or a feature with a performance cost.

But I agree, it's boring if it’s implementation can change in future.




*De :*Vladislav Vaintroub [mailto:vvaintroub@xxxxxxxxx]
*Envoyé :* vendredi 31 mars 2017 12:37
*À :* jerome brauge; bar@xxxxxxxxxxx <mailto:bar@xxxxxxxxxxx>
*Cc :* MariaDB Developers (maria-developers@xxxxxxxxxxxxxxxxxxx <mailto:maria-developers@xxxxxxxxxxxxxxxxxxx>); Diego Dupin
*Objet :* Re: [Maria-developers] bb-10.2-compatibility - processlist

On 3/31/2017 12:16 PM, jerome brauge wrote:

    Hi Vladislav,

    As I understand is that this plugin allow user to see their own
    session variables.

    Here, we can see these information for each session (for
    monitoring purpose, licensing control, …)

    Is it correct ?

Yes, I think you're  correct and I'm not .

I was chatting to Diego, our JDBC expert, he does not seem to recall the reason session variables were used. I assume the implementation can change without any notification. MySQL Connector/J does not issue SET as I understand at the moment, does not talk to DB at all.

But for monitoring purposes, there is something in performance schema you might find useful https://dev.mysql.com/doc/refman/5.6/en/session-connect-attrs-table.html , most current drivers populate this table with similar information to Appname, client user, client hostname



*De :*Vladislav Vaintroub [mailto:vvaintroub@xxxxxxxxx]
*Envoyé :* vendredi 31 mars 2017 12:06
*À :* jerome brauge; bar@xxxxxxxxxxx <mailto:bar@xxxxxxxxxxx>
*Cc :* MariaDB Developers (maria-developers@xxxxxxxxxxxxxxxxxxx <mailto:maria-developers@xxxxxxxxxxxxxxxxxxx>)
*Objet :* Re: [Maria-developers] bb-10.2-compatibility - processlist

Hi Jerome, Bar

is user_variables plugin not enough for that ? https://mariadb.com/kb/en/mariadb/information-schema-user_variables-table/

It is only one driver that sets these user variables, so it might not be worth to extend processlist even more for general case, just for that.

On 3/31/2017 11:05 AM, jerome brauge wrote:

    Hello Alexander,

    Here is a patch to add information provided by JDBC
    (setClientInfo) in information_schema.processlist
    (ApplicationName, ClientUser, ClientHostname).

    Do you think that it can be integrate ?




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