rabbit_peer_discovery: Compute start time once (backport #13490) #13497
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... and cache it. [Why] It happens at least in CI that the computed start time varies by a few seconds. I think this comes from the Erlang time offset which might be adjusted over time. This affects peer discovery's sorting of RabbitMQ nodes which uses that start time to determine the oldest node. When the start time of a node changes, it could be considered the seed node to join by some nodes but ignored by the other nodes, leading to troubles with cluster formation. (cherry picked from commit e72d911)
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… and cache it.
Why
It happens at least in CI that the computed start time varies by a few seconds. I think this comes from the Erlang time offset which might be adjusted over time.
This affects peer discovery's sorting of RabbitMQ nodes which uses that start time to determine the oldest node. When the start time of a node changes, it could be considered the seed node to join by some nodes but ignored by the other nodes, leading to troubles with cluster formation.
This is an automatic backport of pull request #13490 done by Mergify.