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java - Dataflow streaming job not scaleing past 1 worker

My streaming dataflow job(2017-09-08_03_55_43-9675407418829265662) using Apache Beam SDK for Java 2.1.0 will not scale past 1 Worker even with a growing pubsub queue (now 100k Undelivered messages) – do you have any ideas why?

Its currently running with autoscalingAlgorithm=THROUGHPUT_BASED and maxNumWorkers=10.

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