Hi Vlad, I'm looking at the community pull request https://github.com/grooverdan/mariadb-server/commit/a9dfee63bad7393002621f92... I have a question regarding your commit: 2943d2b7e99b4221ef481890fc9a56ad569f3985 The contribution aims to remove the hard limit of 50 unique ids as it seems to cause problems for some use cases with a lot of proceeses. It does this by either leaving it at 50 or to be equal to the number of spawned processes. I'm thinking that even setting the limit of unique ids to num_processes might cause problems if there is another mtr running in parallel and both have > 50 processes. This is probably minor but why set this limit so low? Wouldn't a larger number (say 10k) be ok? Or why not generate a random number and lock a file with that number? (if the random number is invalid, generate a new one. On average it should finish quite quickly) Thanks, Vicentiu