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Posted to issues@beam.apache.org by "Nick Aldwin (Jira)" <ji...@apache.org> on 2019/10/29 18:42:00 UTC

[jira] [Created] (BEAM-8513) RabbitMqIO: Allow reads from exchange-bound queue without declaring the exchange

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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