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https://issues.apache.org/jira/browse/BEAM-14014?focusedWorklogId=768511&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-768511
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ASF GitHub Bot logged work on BEAM-14014:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/May/22 13:46
            Start Date: 10/May/22 13:46
    Worklog Time Spent: 10m 
      Work Description: 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.





Issue Time Tracking
-------------------

    Worklog Id:     (was: 768511)
    Time Spent: 3h 50m  (was: 3h 40m)

> Support impersonation credentials in Dataflow runner.
> -----------------------------------------------------
>
>                 Key: BEAM-14014
>                 URL: https://issues.apache.org/jira/browse/BEAM-14014
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-dataflow
>            Reporter: Valentyn Tymofieiev
>            Assignee: Ryan Thompson
>            Priority: P2
>          Time Spent: 3h 50m
>  Remaining Estimate: 0h
>




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