This is an issue found in Apache Beam (https://issues.apache.org/jira/browse/BEAM-2708) and has been found to impact Dataflow SDK for Java 1.6.0 to 1.9.0. The fix has been backported with https://github.com/GoogleCloudPlatform/DataflowJavaSDK/pull/592
This is an issue found in Apache Beam (https://issues.apache.org/jira/browse/BEAM-2708) and has been found to impact Dataflow SDK for Java 1.6.0 to 1.9.0.
The fix has been backported with #592