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https://issues.apache.org/jira/browse/BEAM-3844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16861908#comment-16861908
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Ismaël Mejía commented on BEAM-3844:
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Is this still an issue? [~kenn] can you assign to the proper person that can
validate it? or close it if this is not the case.
> Trigger example in the cookbook failed to run on Dataflow
> ---------------------------------------------------------
>
> Key: BEAM-3844
> URL: https://issues.apache.org/jira/browse/BEAM-3844
> Project: Beam
> Issue Type: Bug
> Components: examples-java
> Affects Versions: 2.3.0
> Reporter: Zhaozhi QIan
> Priority: Minor
> Labels: beginner, starter
>
> The example org.apache.beam.examples.cookbook.TriggerExample failed to run on
> Dataflow. Big query returns failure code 409 indicating it's trying to write
> to an non-empty table but WriteDisposition is set to WRITE_EMPTY (the default
> value). The example fails with this error even if the output table does not
> exist before the example is run.
> In fact, the four pipelines corresponding to the four trigger types write to
> the same table. The pipeline that finishes first will create the table and
> insert data into it. But the remaining ones can only _append_ to that table.
> Hence, the problem can be avoided by setting WriteDisposition to WRITE_APPEND.
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