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> On Apr 24, 2017, at 8:14 AM, Federico Razzoli <federico_raz@xxxxxxxx> wrote:
> 
> Hi Jocelyn,
> 
> The article you linked is quite old, so I wanted to check the source code to find if something changed.
> I didn't investigate much but I searched in MariaDB's master branch via GitHub. The search strings were 'read_rnd_buffer_size' and 'read-rnd-buffer-size'. I found nothing except for some test files and the variable initialization at server startup.
> I repeated the same searches in MySQL master branch, and again, I found only tests and initialization.
> Can you explain this? The variable is unused now?
> 

One use of read_rnd_buffer_size was with mrr in MySQL. After the changeover to Mariadb, we missed that Mariadb uses mrr_buffer_size instead of read_rnd_buffer_size. You probably know that, but, just pointing out one place where it would have been removed from the code. 

Steve