robertwb commented on a change in pull request #15099:
URL: https://github.com/apache/beam/pull/15099#discussion_r661013585



##########
File path: sdks/python/apache_beam/io/kafka.py
##########
@@ -96,8 +96,16 @@
      ('commit_offset_in_finalize', bool), ('timestamp_policy', str)])
 
 
-def default_io_expansion_service():
-  return BeamJarExpansionService('sdks:java:io:expansion-service:shadowJar')
+def default_io_expansion_service(args = None):
+  extra_args = None
+  if args:
+    if type(args) != type({}):
+      raise ValueError(
+          "Invalid value, expected dictionary for 
default_expansion_service_args, got %s"
+          % (type(args), ))
+    extra_args = ['{{PORT}}'] + list(map(lambda i: "--%s=%s" % (i[0], i[1]), 
args.items()))

Review comment:
       ["--%s=%s" % kv for kv in args.items()]




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