damccorm opened a new issue, #21376:
URL: https://github.com/apache/beam/issues/21376
The example "The Slowly updating global window side inputs" [1] produces an
unexpected error. Our implementation follows the example but uses a 30-second
duration. The error first occurred after 4000 triggers. The pipeline ran on
Dataflow using Java 1.8 and Beam SDK 2.33.0.
```
Caused by:
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.util.concurrent.UncheckedExecutionException:
java.lang.IllegalArgumentException: PCollection with more than one element
accessed as a singleton view.
```
Applying a combine function before applying the view singleton has no
positive effect. Changing the refresh duration to 5 minutes alleviates or
delays the error.
****Relevant post:****
*
[https://lists.apache.org/thread/v005b7osqxv774wjpjhg103bqto4v7yh](https://lists.apache.org/thread/v005b7osqxv774wjpjhg103bqto4v7yh)
*
[https://lists.apache.org/thread/wfm77wkqrkwlrhgbnq9f3x8nyzsn51xm](https://lists.apache.org/thread/wfm77wkqrkwlrhgbnq9f3x8nyzsn51xm)
*
[https://github.com/spotify/scio/issues/1190](https://github.com/spotify/scio/issues/1190)
*
[https://github.com/spotify/scio/issues/3521](https://github.com/spotify/scio/issues/3521)
Please let me know if you have any questions.
{****}References{****}:
[1]
[https://beam.apache.org/documentation/patterns/side-inputs/](https://beam.apache.org/documentation/patterns/side-inputs/)
Imported from Jira
[BEAM-14023](https://issues.apache.org/jira/browse/BEAM-14023). Original Jira
may contain additional context.
Reported by: yianni.
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