[GitHub] [beam] kennknowles opened a new issue, #19162: Allow to change the PubsubClientFactory when using PubsubIO

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kennknowles opened a new issue, #19162:
URL: https://github.com/apache/beam/issues/19162

   When we use PubSub to push or pull messages, we currently have no choice of serialization implementation because PubsubIO use internaly the *_PubsubJsonClient.FACTORY_* of type _*PubsubJsonClientFactory*_ to serialize or deserialize messages.
   
   It should be nice to be able to set a different factory (e.g. *_PubsubGrpcClientFactory_*) to decrease the size of messages (and then decrease the price of using Pubsub).
   
    
   
   I guess It could be possible to write something like:
   
   `PubsubIO.Write<PubsubMessage> write =`
    `    PubsubIO.writeMessages()`
    `            .to("projects/project/topics/topic")`
    `            *.withFactory(PubsubGrpcClient.FACTORY)*`
    `            .withTimestampAttribute("timestamp")``;`
   
   or 
   
   `PubsubIO.Read<PubsubMessage> read = `
    `    PubsubIO.readMessages()`
    `            .fromSubscription("projects/project/subscriptions/name")`
    `            *.withFactory(PubsubGrpcClient.FACTORY)*`
    `            .withTimestampAttribute("timestamp");`
   
    
   
   Imported from Jira [BEAM-5676](https://issues.apache.org/jira/browse/BEAM-5676). Original Jira may contain additional context.
   Reported by: lhauspie.


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