Carl McGraw created BEAM-2660:
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             Summary: Set PubsubIO batch size using builder
                 Key: BEAM-2660
                 URL: https://issues.apache.org/jira/browse/BEAM-2660
             Project: Beam
          Issue Type: Improvement
          Components: sdk-java-gcp
            Reporter: Carl McGraw
            Assignee: Stephen Sisk


PubsubIO doesn't allow users to set the publish batch size. Instead the value 
is hard coded in both the BoundedPubsubWriter and the UnboundedPubsubSink. 

google's pub/sub is bound to a maximum of 10mb per request size. My company has 
run into problems with events that are individually smaller than 1mb, but when 
batched in the 100 or 2000 default batch sizes causes pubsub to fail to send 
the event.





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