kennknowles opened a new issue, #18767:
URL: https://github.com/apache/beam/issues/18767

   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.
   
   Imported from Jira 
[BEAM-3844](https://issues.apache.org/jira/browse/BEAM-3844). Original Jira may 
contain additional context.
   Reported by: Zhaozhi.


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