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https://issues.apache.org/jira/browse/BEAM-6970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chloe Thonin updated BEAM-6970:
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Attachment: Capture du 2019-04-02 16-55-37.png
> Java SDK : How to bounded messages from PubSub ?
> -------------------------------------------------
>
> Key: BEAM-6970
> URL: https://issues.apache.org/jira/browse/BEAM-6970
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow, sdk-java-core
> Affects Versions: 2.11.0
> Environment: Beam worker : Dataflow (GCP)
> Reporter: Chloe Thonin
> Priority: Minor
> Attachments: Capture du 2019-04-02 16-55-37.png
>
>
> I want to set up a dataflow Pipeline in Streaming mode.
> My dataflow do theses tasks :
> * Read messages from pubsub
> * Build my "Document" object
> * Insert this Document into BigQuery
> * Store the initial message into Google Cloud Storage
> The code successfully build and run, but it takes a lot of time for some
> messages.
> I think it takes a lot of time because it treats pusub message one by one :
> -> I build a PCollection<Documents> with messages from pubsub.
> {code:java}
> PCollection<Documents> rawtickets = pipeline
> .apply("Read PubSub Events", PubsubIO.readStrings().fromTopic(TOPIC))
> .apply("Make Document ", ParDo.of(new DoFn<String, Documents>() {
> @ProcessElement
> public void processElement(ProcessContext c)
> throws Exception {
> String rawXMl = c.element();
> /** My code for build my object "Document"
> **/
> c.output(rawXml);
> }
> }
> ))
> .setCoder(AvroCoder.of(Documents.class));
> {code}
>
> Here a picture of my complete process :
> [Complete Process |https://zupimages.net/up/19/14/w4df.png]
> We can see the latency of the process after reading messages.
> Concretely, I search to create a Pcollection of N element. I have tried
> methods founds here :
> [https://beam.apache.org/documentation/programming-guide/#triggers] but it
> doesn't group my pubsub messages.
>
> How I can batch this process ?
>
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