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…bers [Why] If `rabbit_mnesia:members/0` hit an error, it always returned the node itself. `rabbit_khepri:members/0` returns an empty list to distinguish an error and let the caller handle it. When peer discovery queries the cluster members ant it fails, it didn't handle the empty list so far. This led to errors while sorting nodes to determine which one to use as the cluster seed. [How] If `rabbit_nodes:list_members/0` returns an empty list, the code assumes that the node is alone/unclustered (i.e. like what would be implicitly done if Mnesia was used).
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rabbit_peer_discovery: Handle error/timeout when querying cluster members (backport #15568)
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Why
If
rabbit_mnesia:members/0hit an error, it always returned the node itself.rabbit_khepri:members/0returns an empty list to distinguish an error and let the caller handle it.When peer discovery queries the cluster members ant it fails, it didn't handle the empty list so far. This led to errors while sorting nodes to determine which one to use as the cluster seed.
How
If
rabbit_nodes:list_members/0returns an empty list, the code assumes that the node is alone/unclustered (i.e. like what would be implicitly done if Mnesia was used).