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Subject [GitHub] [beam] robertwb commented on a change in pull request #11060: [BEAM-9454] Create Deduplication transform based on user timer/state
Date Mon, 23 Mar 2020 18:50:08 GMT
robertwb commented on a change in pull request #11060: [BEAM-9454] Create Deduplication transform
based on user timer/state

 File path: sdks/python/apache_beam/transforms/
 @@ -0,0 +1,133 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# pytype: skip-file
+"""a collection of ptransforms for deduplicating elements."""
+from __future__ import absolute_import
+from __future__ import division
+import typing
+from apache_beam import typehints
+from apache_beam.coders.coders import BooleanCoder
+from apache_beam.transforms import core
+from apache_beam.transforms import ptransform
+from apache_beam.transforms import userstate
+from apache_beam.transforms.timeutil import TimeDomain
+from apache_beam.utils import timestamp
+__all__ = [
+    'Deduplicate',
+    'DeduplicatePerKey',
+K = typing.TypeVar('K')
+V = typing.TypeVar('V')
+@typehints.with_input_types(typing.Tuple[K, V])
+@typehints.with_output_types(typing.Tuple[K, V])
+class DeduplicatePerKey(ptransform.PTransform):
+  """ A PTransform which deduplicates <key, value> pair over a time domain and
+  threshold. Values in different windows will NOT be considered duplicates of
+  each other. Deduplication is best effort.
 Review comment:
   It's not really best effort, rather it is only respected within the time domains (and there
you can count on it). 

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