Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/3777
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GitHub user aaltay opened a pull request:
https://github.com/apache/beam/pull/3777
[BEAM-2814] Update error message in AsSingleton
R: @robertwb
Updated message would be useful for debugging the issue in BEAM-2814.
You can merge this pull request into a Git repository by ru
