[jira] [Comment Edited] (BEAM-638) Add sink transform to write bounded data per window, pane, [and key] even when PCollection is unbounded

["Asmir Avdicevic (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15999835#comment-15999835 ] 

Asmir Avdicevic edited comment on BEAM-638 at 5/7/17 1:18 PM:
--------------------------------------------------------------

Sure here's the majority of it:

{code:title=MyPipeline.java|borderStyle=solid}
PCollection<PubsubMessage> messageStream = p.apply(PubsubIO.readPubsubMessagesWithAttributes().fromTopic(pubsub_topic).withTimestampAttribute("timestamp"));

PCollection<String> stringMessageStream = messageStream.apply(ParDo.of(new DoFn<PubsubMessage, String>() {
    @ProcessElement
    public void processElement(ProcessContext c) {
        System.out.println("Got message: " + new String(c.element().getPayload()));
        c.outputWithTimestamp(new String(c.element().getPayload()), c.timestamp());
    }
}));

PCollection<String> windowedRawMessages = stringMessageStream.apply(Window.<String>into(FixedWindows.of(Duration.standardMinutes(options.getRawMessageWindowSize()))).triggering(Repeatedly.forever(AfterWatermark.pastEndOfWindow())).discardingFiredPanes().withAllowedLateness(Duration.standardMinutes(1)));

PDone written = windowedRawMessages.apply(new WriteOneFilePerWindow("rawpawdata-" + options.getEnvironment() + "-raw"));

{code}

{code:title=SampleMessage.json|borderStyle=solid}
{"pid":"test-client-project", "cid": "test-client-name", "v": "1", "status": "OK", "timestamp": "1494092597000", "data": "eyJ0YWdzIjogWyJ0ZXN0LXRhZyJdLCAibWV0cmljIjogInRlc3QtbWV0cmljIiwgInZhbHVlIjogNDF9"}
{code}


was (Author: arqu):
Sure here's the majority of it:

{code:title=MyPipeline.java|borderStyle=solid}
PCollection<PubsubMessage> messageStream = p.apply(PubsubIO.readPubsubMessagesWithAttributes().fromTopic(pubsub_topic).withTimestampAttribute("timestamp"));

PCollection<String> stringMessageStream = messageStream.apply(ParDo.of(new DoFn<PubsubMessage, String>() {
    @ProcessElement
    public void processElement(ProcessContext c) {
        System.out.println("Got message: " + new String(c.element().getPayload()));
        c.outputWithTimestamp(new String(c.element().getPayload()), c.timestamp());
    }
}));

PCollection<String> windowedRawMessages = stringMessageStream.apply(Window.<String>into(FixedWindows.of(Duration.standardMinutes(options.getRawMessageWindowSize()))).triggering(Repeatedly.forever(AfterWatermark.pastEndOfWindow())).discardingFiredPanes().withAllowedLateness(Duration.standardMinutes(1)));

PDone written = windowedRawMessages.apply(new WriteOneFilePerWindow("rawpawdata-" + options.getEnvironment() + "-raw"));

{code}

> Add sink transform to write bounded data per window, pane, [and key] even when PCollection is unbounded
> -------------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-638
>                 URL: https://issues.apache.org/jira/browse/BEAM-638
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-core
>            Reporter: Jean-Baptiste Onofré
>            Assignee: Davor Bonaci
>
> Today, if the pipeline source is unbounded, and the sink expects a bounded collection, there's no way to use a single pipeline. Even a window creates a chunk on the unbounded PCollection, but the "sub" PCollection is still unbounded.
> It would be helpful for users to have a Window function that create a bounded PCollection (on the window) from an unbounded PCollection coming from the source.



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