The consistency of group membership

Question

erlmachinedev opened this issue a year ago · comments

Hi @ostinelli, I found this case which would be nice to classify first (before more detailed test and clarification).

syn:is_member/3

syn:members/2

The first call makes the negative false until syn:members/2 invocation has done from the client side.

It seems that the second call ensures the consistency while the first one doesn't.

If so (is_member/3 isn't consistent by nature) the right doc could be done (to describe the feature properly).

If not (there is a bug 🐛) maybe I could help (at least to give more info and try to reproduce via ct test).

What do you think?

Best regards, Slava

Roberto Ostinelli · Answer 1 · Sat Mar 25 2023 00:19:40 GMT+0800 (China Standard Time)

Both calls check the local ETS tables, there is no difference between them (besides the return values). is_member/3 does not call members/2.

Also, syn is eventually consistent.

Vjacheslav Brichkovskiy · Answer 2 · Sat Mar 25 2023 00:27:38 GMT+0800 (China Standard Time)

Thanks for the instant answer @ostinelli, maybe some issue with my ct SUITE. If they both perform ETS query then probably issue on my side.