steveniemitz commented on a change in pull request #16229:
URL: https://github.com/apache/beam/pull/16229#discussion_r776509376



##########
File path: sdks/python/apache_beam/runners/dataflow/internal/apiclient.py
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@@ -519,11 +523,16 @@ def __reduce__(self):
 
 
 class DataflowApplicationClient(object):
+  _HASH_CHUNK_SIZE = 1024 * 8
+  _GCS_CACHE_PREFIX = "artifact_cache"
   """A Dataflow API client used by application code to create and query 
jobs."""
-  def __init__(self, options):
+  def __init__(self, options, root_staging_location=None):

Review comment:
       it's used above 
https://github.com/apache/beam/pull/16229/files#diff-d7e8ff5775f3fb328137483bd443e04d96caa92f3f68a188391f18a8e06075a0R574.
  The runner mutates the staging location passed in to be unique per job, but 
we need the root that the user actually passed in to derive the path for the 
cache, otherwise the cache would be per-job, which would defeat the whole 
purpose.




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