Description:
Per the discussion below, the thread_pool_size system variable currently is dynamic, but should not be. It should be settable only at server startup.
At 9:32 PM +0200 2/7/08, Michael Widenius wrote:
Hi!
>>>>> "Paul" == Paul DuBois <paul@mysql.com> writes:
Paul> I'm going to take issue with one of Monty's statements. :-)
Paul> At 11:22 PM +0200 2/1/08, Michael Widenius wrote:
>> Hi!
>>
>>>>>>> "Konstantin" == Konstantin Osipov <konstantin@mysql.com> writes:
>>
>> <cut>
>> >> The thread_pool_size system variable can be set at runtime (is
>>>> dynamic)?
>>
Konstantin> Don't know.
>>
>> No, it can't be set at runtime (All the worker threads are started
>> when mysqld starts).
Paul> That seems not to be true:
mysql> select @@global.thread_pool_size;
Paul> +---------------------------+
Paul> | @@global.thread_pool_size |
Paul> +---------------------------+
Paul> | 20 |
Paul> +---------------------------+
Paul> 1 row in set (0.00 sec)
mysql> set @@global.thread_pool_size = @@global.thread_pool_size + 1;
Paul> Query OK, 0 rows affected (0.00 sec)
mysql> select @@global.thread_pool_size;
Paul> +---------------------------+
Paul> | @@global.thread_pool_size |
Paul> +---------------------------+
Paul> | 21 |
Paul> +---------------------------+
Paul> 1 row in set (0.00 sec)
Paul> So it *is* dynamic. The question then becomes, is it *supposed*
Paul> to be dynamic, or is it a bug that this variable can be set at runtime?
It's a bug that this can be set runtime.
Regards,
Monty
How to repeat:
N/A
