Zhaozhi QIan created BEAM-3844:

             Summary: 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
            Assignee: Reuven Lax

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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