"ABA"?

[tdrhq]

Hi folks!

Thanks for building braft, super awesome so far.

I'm not able to figure out what ABA stands for. I see it referenced at several places, including the examples (e.g. https://github.com/baidu/braft/blob/master/example/block/server.cpp#L153).

I'm not sure if this is a standard terminology associated with the Raft protocol since I'm not able to find any relevant Google search results. Could you expand that for me? I'm happy to go about searching and reading about this myself, but right now I just don't know what to look for.

Thanks!
Arnold

[tdrhq]

Ah, as soon as I wrote that I think I figured it out https://en.wikipedia.org/wiki/ABA_problem

Still trying to figure out how that line of code prevents issues here, but at least at this point I know what this is talking about so I'll close this out.