ryanthompson591 commented on code in PR #17244:
URL: https://github.com/apache/beam/pull/17244#discussion_r869260142


##########
sdks/python/apache_beam/io/gcp/gcsfilesystem.py:
##########
@@ -38,6 +40,15 @@ class GCSFileSystem(FileSystem):
   CHUNK_SIZE = gcsio.MAX_BATCH_OPERATION_SIZE  # Chuck size in batch operations
   GCS_PREFIX = 'gs://'
 
+  def __init__(self, pipeline_options):
+    super().__init__(pipeline_options)
+    if isinstance(pipeline_options, PipelineOptions):
+      gcs_options = pipeline_options.view_as(GoogleCloudOptions)
+      impersonate_service_account = gcs_options.impersonate_service_account

Review Comment:
   I think I need to have it here, otherwise when the impersonated service 
tries to upload to a shared directory it won't be able to. Since credentials is 
a global variable it's important I set impersonation beforehand.
   
   We can discuss a refactor, but for now, I can't get this to work otherwise.



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