Nick Aldwin created BEAM-8513:
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Summary: RabbitMqIO: Allow reads from exchange-bound queue without
declaring the exchange
Key: BEAM-8513
URL: https://issues.apache.org/jira/browse/BEAM-8513
Project: Beam
Issue Type: Improvement
Components: io-java-rabbitmq
Environment: testing with DirectRunner
Reporter: Nick Aldwin
The RabbitMqIO always declares an exchange if it is configured to read from it.
This is problematic with pre-existing exchanges (a relatively common pattern),
as there's no provided configuration for the exchange beyond exchange type.
(We stumbled on this because RabbitMqIO always declares a non-durable exchange,
which fails if the exchange already exists as a durable exchange)
A solution to this would be to allow RabbitMqIO to read from an exchange
without declaring it. This pattern is already available for queues via the
`queueDeclare` flag. I propose an `exchangeDeclare` flag which preserves
existing behavior except for skipping the call to `exchangeDeclare` before
binding the queue to the exchange.
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