title: "The Dataflow appears to be stuck" on Cloud Dataflow with Apache Beam 2.1.1 after switching to Firebase Firestore as a pipeline source
body: <p>I am struggling with this, and initially thought it could be the result of switching the pipeline data source from Cloud Datastore to Firebase Firestore, which required a new project. But I've since found the same error in separate pipelines. All pipelines run successfully on the local DirectRunner and the permissions appear to be the same as the old project.</p>
  
  <p>It looks like none of the VMs are booting and the pipeline never scales above 0 workers. "The Dataflow appears to be stuck" is the only error message I could find and there is nothing in StackDriver. Tried every dependency management variation I could find in the docs but it doesn't seem to be the problem.</p>
  
  <p>My last Dataflow job-id is 2017-10-11_11_12_01-15165703816317931044.</p>
  
  <p>Tried elevating the access roles of all services accounts and still no luck.</p>