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Erlang / Erlang Advanced Interview questions

Why can global name registration cause a network partition ("split brain") problem?

If a cluster's network splits into two isolated groups that can each still see their own members but not the other side, each half only knows about its own view of global names. A process on each side of the partition could register the same global name independently, since neither side can detect the other's conflicting registration while the network is split — you end up with two "single" registered processes simultaneously, each side believing it holds the only one.

When the partition heals and the two node groups reconnect, global's conflict resolver runs retroactively and kills one of the two conflicting processes to restore a single consistent registration — meaning whichever side loses that resolution had been operating, potentially for some time, under a now-invalidated assumption that it held the sole registered process.

This is why systems relying on global uniqueness guarantees during network instability often add their own quorum or leader-election logic on top of global, rather than trusting it alone under partition conditions.

Why can a network partition lead to two conflicting global registrations for the same name?
What happens when a network partition heals after such a conflict occurred?

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