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https://issues.apache.org/jira/browse/BEAM-5707?focusedWorklogId=154284&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-154284
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ASF GitHub Bot logged work on BEAM-5707:
----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Oct/18 13:07
Start Date: 15/Oct/18 13:07
Worklog Time Spent: 10m
Work Description: mxm commented on a change in pull request #6637:
[BEAM-5707] Add a periodic, streaming impulse source for Flink portable
pipelines
URL: https://github.com/apache/beam/pull/6637#discussion_r225158157
##########
File path: sdks/python/apache_beam/examples/flink/flink_streaming_impulse.py
##########
@@ -0,0 +1,78 @@
+#
+# 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.
+#
+
+"""A streaming workflow that uses a synthetic streaming source.
+
+This can only be used with the Flink portable runner.
Review comment:
I wonder how meaningful this example is here? It would be nice to convert
this into a streaming test case as part of the portable runner tests, e.g. add
tests to `flink_runner_test.py`.
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Issue Time Tracking
-------------------
Worklog Id: (was: 154284)
Time Spent: 2.5h (was: 2h 20m)
> Add a portable Flink streaming synthetic source for testing
> -----------------------------------------------------------
>
> Key: BEAM-5707
> URL: https://issues.apache.org/jira/browse/BEAM-5707
> Project: Beam
> Issue Type: Improvement
> Components: runner-flink
> Reporter: Micah Wylde
> Assignee: Aljoscha Krettek
> Priority: Minor
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> Currently there are no built-in streaming sources for portable pipelines.
> This makes it hard to test streaming functionality in the Python SDK.
> It would be very useful to add a periodic impulse source that (with some
> configurable frequency) outputs an empty byte array, which can then be
> transformed as desired inside the python pipeline. More context in this
> [mailing list
> discussion|https://lists.apache.org/thread.html/b44a648ab1d0cb200d8bfe4b280e9dad6368209c4725609cbfbbe410@%3Cdev.beam.apache.org%3E].
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