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https://issues.apache.org/jira/browse/BEAM-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh resolved BEAM-2982.
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Resolution: Fixed
Fix Version/s: 2.2.0
> PubSubIO.readMessages().fromSubscription(...) doesn't work with ValueProvider
> -----------------------------------------------------------------------------
>
> Key: BEAM-2982
> URL: https://issues.apache.org/jira/browse/BEAM-2982
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-gcp
> Reporter: Ben Chambers
> Assignee: Thomas Groh
> Fix For: 2.2.0
>
>
> Originally reported on Stack Overflow:
> https://stackoverflow.com/questions/46360584/apache-beam-template-runtime-context-error
> ---
> In the `PubsubUnboundedSource#expand` method we create the PubsubSource:
> https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSource.java#L1399
> Creating the PubsubSource calls `getSubscription` which attempts to get the
> value out of a value provider.
> To support templatization, the PubsubSource needs to take the ValueProvider,
> and only get the subscription out at pipeline execution time.
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