Zhaozhi QIan created BEAM-3844:
Summary: Trigger example in the cookbook failed to run on Dataflow
Issue Type: Bug
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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