[jira] [Created] (BEAM-14023) Slowly updating global window side inputs

["John Gerassimou (Jira)" <ji...@apache.org>]

John Gerassimou created BEAM-14023:
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             Summary: Slowly updating global window side inputs
                 Key: BEAM-14023
                 URL: https://issues.apache.org/jira/browse/BEAM-14023
             Project: Beam
          Issue Type: Bug
          Components: examples-java, sdk-java-core
            Reporter: John Gerassimou


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.

 
{code:java}
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. {code}
 

 

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/wfm77wkqrkwlrhgbnq9f3x8nyzsn51xm]
 * [https://github.com/spotify/scio/issues/1190]
 * [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/]



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