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https://issues.apache.org/jira/browse/BEAM-1630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275264#comment-16275264
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ASF GitHub Bot commented on BEAM-1630:
--------------------------------------
chamikaramj commented on a change in pull request #4064: [BEAM-1630] Adds
support for processing Splittable DoFns using DirectRunner.
URL: https://github.com/apache/beam/pull/4064#discussion_r153898373
##########
File path: sdks/python/apache_beam/runners/direct/sdf_direct_runner.py
##########
@@ -0,0 +1,264 @@
+#
+# 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
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+"""This module contains Splittable DoFn logic that is specific to DirectRunner.
+"""
+
+from threading import Lock
+from threading import Timer
+
+import apache_beam as beam
+from apache_beam import TimeDomain
+from apache_beam import pvalue
+from apache_beam.io.iobase import RestrictionTracker
+from apache_beam.pipeline import PTransformOverride
+from apache_beam.runners.common import DoFnContext
+from apache_beam.runners.common import DoFnInvoker
+from apache_beam.runners.common import DoFnSignature
+from apache_beam.runners.common import OutputProcessor
+from apache_beam.runners.direct.evaluation_context import DirectStepContext
+from apache_beam.runners.direct.util import KeyedWorkItem
+from apache_beam.runners.direct.watermark_manager import WatermarkManager
+from apache_beam.runners.sdf_common import ElementAndRestriction
+from apache_beam.runners.sdf_common import ProcessKeyedElements
+from apache_beam.transforms.core import ProcessContinuation
+from apache_beam.transforms.ptransform import PTransform
+from apache_beam.transforms.trigger import _ValueStateTag
+from apache_beam.utils.windowed_value import WindowedValue
+
+
+class ProcessKeyedElementsViaKeyedWorkItemsOverride(PTransformOverride):
+ """A transform override for ProcessElements transform."""
+
+ def get_matcher(self):
+ def _matcher(applied_ptransform):
+ return isinstance(
+ applied_ptransform.transform, ProcessKeyedElements)
+
+ return _matcher
+
+ def get_replacement_transform(self, ptransform):
+ return ProcessKeyedElementsViaKeyedWorkItems(ptransform)
+
+
+class ProcessKeyedElementsViaKeyedWorkItems(PTransform):
+ """A transform that processes Splittable DoFn input via KeyedWorkItems.
+ """
+
+ def __init__(self, process_keyed_elements_transform):
+ self._process_keyed_elements_transform = process_keyed_elements_transform
+
+ def expand(self, pcoll):
+ return pcoll | beam.core.GroupByKey() | ProcessElements(
+ self._process_keyed_elements_transform)
+
+
+class ProcessElements(PTransform):
+ """Processes keyed input via Splittable DoFn objects."""
Review comment:
Updated.
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> Add Splittable DoFn to Python SDK
> ---------------------------------
>
> Key: BEAM-1630
> URL: https://issues.apache.org/jira/browse/BEAM-1630
> Project: Beam
> Issue Type: Improvement
> Components: sdk-py-core
> Reporter: Chamikara Jayalath
> Assignee: Chamikara Jayalath
>
> Splittable DoFn [1] is currently being implemented for Java SDK [2]. We
> should add this to Python SDK as well.
> Following document proposes an API for this.
> https://docs.google.com/document/d/1h_zprJrOilivK2xfvl4L42vaX4DMYGfH1YDmi-s_ozM/edit?usp=sharing
> [1] https://s.apache.org/splittable-do-fn
> [2]
> https://lists.apache.org/thread.html/0ce61ac162460a149d5c93cdface37cc383f8030fe86ca09e5699b18@%3Cdev.beam.apache.org%3E
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