Hello! If this was fixed in some Galera release, please let me know.
I did not see any Forwarded: line in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984996 On Fri, 19 Mar 2021 at 09:34, Marc Lehmann <schm...@schmorp.de> wrote: > > On Fri, Mar 19, 2021 at 03:41:06PM +1100, Daniel Black <dan...@mariadb.org> > wrote: > > > > This has the effect of polluting the environment of other sservices with > > > > these variables, which is usually pretty harmless. > > > > The intent was for minimal effects. > > That has clearly failed, as it pollutes the environment blocvks for all > services on the system- > > > > However, if there are multiple server instances then this creates a race > > > > condition > > > > Multiinstance services use _WSREP_START_POSITION%I as the environment name > > > > ref: > > https://salsa.debian.org/mariadb-team/mariadb-10.3/-/blob/master/support-files/mari...@.service.in#L88 > > That might indeed work around the problem, but of course increases the > pollution for unrelated services and user sessions. > > > I'm not convinced about it easily. There are aria and innodb locks on > > filesystem preventing a second process > > modifying an already running process. > > > > Also the state only exists within the startup process of the > > mariadb.service. There are systemd blocks that prevent > > two copies of the same service starting at the same time. > > > > Maybe you mean something I haven't thought of. Can you explain the scenario? > > The environment variables are _global_, not per-service. They will leak > into every other service started concurrently, including other mariadb > services. > > > I know it's unclean. > > > > Suggestions welcome as to how to communicate state between two separate > > ExecStart* states in systemd welcome. > > Files would be an obvious better solution, either using instanced > filenames or maybe a private fs namespace (e.g. in /tmp). I am not a > systemd expert, so can't comment on what the best working solution would > be, but files are obviously already better without any systemd features, > as they don't interfere with the suer environment or other services. > > > * Codership are quite unaccepting of contributions (e.g: > > https://github.com/codership/galera/pull/109). > > Can't force them to fix bugs or have a high-quality product, of > course. They do their thing, and hopefully get happy. But debian could, > and probably should, if at all possible. > > > And there's been no bugs that I've found reported against the operation of > > the functionality. > > Luck is not a good argument :) It is, after all, a race condition. > > > > > * What was the outcome of this action? > > > > > > > > Environment polluted, > > > > One environment variable of a constrained name. Pollution? That appears for > > the microscopic time between a couple service script starts and is gone by > > the time the service start? Pollution, really? > > Slippery slope much? :) > > The "microscopic" time can be many minutes or longer under normal > operating conditions, and I don't think I need to seriously defend leaving > the global environment alone. > > > critical environment variables of other services > > > > erased/modified. > > > > > > > Nothing else is modified or erased as you've already seen > > Other than variables of other services, no, I agree. > > > > > A systemd service should _never_ _ever_ modify the global environment. > > > > I agree. But an exaggerated purist argument to fix a problem that doesn't > > have a concrete real or theoretical failure isn't going to get a high > > priority. > > That's why I explaiend concrete and theoretical failures in my report. > > In any case, I think the problem is well understood, and I don't think more > explanations will be needed. If nobody cares about fixing this, thats fine > with me. > > Good luck, and thanks for your efforts! > > -- > The choice of a Deliantra, the free code+content MORPG > -----==- _GNU_ http://www.deliantra.net > ----==-- _ generation > ---==---(_)__ __ ____ __ Marc Lehmann > --==---/ / _ \/ // /\ \/ / schm...@schmorp.de > -=====/_/_//_/\_,_/ /_/\_\ -- - Otto