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To add a bit of context here. Process groups can be used in many ways but specifically in RabbitMQ they were used for tracking of exclusive queues on an AMQP 0-9-1 connection, so that when a connection terminates, all exclusive queues (if any) on it would be terminated very shortly after. RabbitMQ Stream Protocol does not allow clients to declare exclusive streams, so it likely can avoid using process groups entirely. And so can most protocol readers. |
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And no longer a function available in the stream plugin. References rabbitmq/rabbitmq-server#14825
This function was not called from anywhere and was the only place that expected stream connections to be registered in pg_local.
pg_local is based on the pg2 module, which got removed from Erlang/OTP years ago. It was replaced by the more efficient pg module, so let's use it directly. We use node-local scopes and single-item groups so that (de)registration is fast, but we can list all connections/channels (by listing all groups in the scope).
These values don't chnage at runtime and take a surprising amount of resources when opening a lot of connections. This speeds up opening many connections/channels by 10% in my tests.
The metadata can take a few milliseconds to reflect a node is down, so the test code must consider a connection failure and test another node.
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pg_local is based on the pg2 module, which got removed
from Erlang/OTP years ago. It was replaced by the more
efficient pg module, so let's use it directly.
We use node-local scopes and single-item groups so that
(de)registration is fast, but we can list all connections/channels
(by listing all groups in the scope).