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https://issues.apache.org/jira/browse/BEAM-11635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Beam JIRA Bot updated BEAM-11635:
---------------------------------
Labels: stale-P2 (was: )
> Unable to subscribe to several PubSub subscriptions with a valueprovider
> ------------------------------------------------------------------------
>
> Key: BEAM-11635
> URL: https://issues.apache.org/jira/browse/BEAM-11635
> Project: Beam
> Issue Type: Wish
> Components: io-java-gcp, runner-dataflow
> Affects Versions: 2.27.0, 2.28.0
> Environment: GCP
> Reporter: Limbourg
> Priority: P2
> Labels: stale-P2
>
> Deploying as a template a streaming job in Google Dataflow, I can't create
> more than one PubSub subscriptions, when subscription name is determined at
> runtime (with a ValueProvider):
> {code:java}
> final List<PCollection<String>> pCollections = new ArrayList<>();
> for (final String topic : topics) {
> final ValueProvider<String> vpSub =
> ValueProvider.NestedValueProvider.of(options.getSubscriptionPrefix(),
> prefix -> prefix + topic);
> PCollection<String> messages =
> pipeline.apply("Sub-read-" + topic,
> PubsubIO.readStrings().fromSubscription(vpSub))
> .apply("Windowing", Window.into(duration));
> pCollections.add(messages);
> }
> {code}
> During the launching of the job, I got the error in the logs:
> {code:java}
> Workflow failed. Causes: The pubsub configuration contains errors:
> Subscription 'projects/_project_/subscriptions/_prefix_' is consumed by
> multiple stages, this will result in undefined behavior.
> {code}
> It seems that the coded SerializableFunction that I provide to the instances
> of NestedValueProvider are not called.
> It could be due to
> [https://github.com/apache/beam/blob/master/runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/DataflowRunner.java]
> StreamingPubsubIOReadTranslator#translate, especially these lines :
> {code:java}
> if (overriddenTransform.getSubscriptionProvider() != null) {
> if (overriddenTransform.getSubscriptionProvider().isAccessible()) {
> stepContext.addInput(
> PropertyNames.PUBSUB_SUBSCRIPTION,
> overriddenTransform.getSubscription().getV1Beta1Path());
> } else {
> stepContext.addInput(
> PropertyNames.PUBSUB_SUBSCRIPTION_OVERRIDE,
> ((NestedValueProvider)
> overriddenTransform.getSubscriptionProvider()).propertyName());
> }
> }
> {code}
> Indeed this code :
> * Forces to use a NestedValueProvider if value is not accessible before
> runtime, due to the vehement cast,
> * Results in having the same incorrect subscription value at runtime (so
> only the prefix in my case) for all the reads of the loop, at least at
> validation time
>
> Seems to be the same issue reported there :
> [https://issuetracker.google.com/u/0/issues/157584222]
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