kennknowles opened a new issue, #18977:
URL: https://github.com/apache/beam/issues/18977

   Apache Beam 2.5 documentation 
([https://beam.apache.org/documentation/sdks/javadoc/2.5.0/](https://beam.apache.org/documentation/sdks/javadoc/2.5.0/)),
 states that
    
   "WRITE_TRUNCATE
   public static final BigQueryIO.Write.WriteDisposition WRITE_TRUNCATE
   Specifies that write should replace a table.
   The replacement *may occur in multiple steps* - for instance by first 
removing the existing table, then creating a replacement, then filling it in. 
*This is not an atomic operation*, and external programs may see the table in 
any of these intermediate steps."
    
   However WRITE_TRUNCATE is an atomic BigQuery operation. The documentation 
needs to be updated.
   
   Imported from Jira 
[BEAM-4789](https://issues.apache.org/jira/browse/BEAM-4789). Original Jira may 
contain additional context.
   Reported by: altay.


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