Let's say we have simple streaming pipeline in which we read data from PubSub. I am wondering how the output of this step is defined. If we stream 10 messages, one after another, all of those 10 messages will be a member of single Pcollection or maybe those will be 10 Pcollections with single element each?
How beam.io.ReadFromPubSub output Pcollection is defined in Apache Beam/Dataflow?
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They will be emitted down the pipeline as 10 individual PCollections, containing the PubSub message as content. See the source code of
ReadFromPubSub.Furthermore, depending on the flag
with_attributesand the message published on PubSub, the content of the PCollection does not necessarily be one single element.