henningw left a comment (kamailio/kamailio#4809)

> > I like the approach with the load in background, copy and then remove the 
> > old data when not in use anymore. A similar approach is used e.g. for the 
> > carrierroute module since many years: 
> > [link](https://github.com/kamailio/kamailio/blob/c71db9dfd384c4c6dabcee70168627c782144b6e/src/modules/carrierroute/cr_data.c#L175)
> >  It works reliable in high load situation with a much larger data set.
> 
> This actually also looks a bit racy to me 😄 without atomic access of the 
> global pointer and the refcount

It was implemented a long time ago, before the easy access to atomic functions 
in the core. It could be for sure improved. :-) Also due to the other user 
base, people generally not executing a reload every few seconds, more every few 
hours max.

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