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https://issues.apache.org/jira/browse/BEAM-5707?focusedWorklogId=155012&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-155012
]
ASF GitHub Bot logged work on BEAM-5707:
----------------------------------------
Author: ASF GitHub Bot
Created on: 16/Oct/18 17:19
Start Date: 16/Oct/18 17:19
Worklog Time Spent: 10m
Work Description: mwylde 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_r225633678
##########
File path:
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/io/StreamingImpulseSource.java
##########
@@ -0,0 +1,73 @@
+/*
+ * 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.
+ */
+package org.apache.beam.runners.flink.translation.wrappers.streaming.io;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+import org.apache.beam.sdk.util.WindowedValue;
+import
org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A streaming source that periodically produces an empty byte array. This is
mostly useful for
+ * debugging, or for triggering periodic behavior in a portable pipeline.
+ */
+public class StreamingImpulseSource extends
RichParallelSourceFunction<WindowedValue<byte[]>> {
+ private static final Logger LOG =
LoggerFactory.getLogger(StreamingImpulseSource.class);
+
+ private final AtomicBoolean cancelled = new AtomicBoolean(false);
+ private long count = 0;
+ private final int intervalMillis;
+ private final int messageCount;
+
+ public StreamingImpulseSource(int intervalMillis, int messageCount) {
+ this.intervalMillis = intervalMillis;
+ this.messageCount = messageCount;
+ }
+
+ @Override
+ public void run(SourceContext<WindowedValue<byte[]>> ctx) {
+ // in order to produce messageCount messages across all parallel subtasks,
we divide by
+ // the total number of subtasks
+ int subtaskCount = messageCount /
getRuntimeContext().getNumberOfParallelSubtasks();
Review comment:
Yes, that's the default. If messageCount is 0 we'll run forever.
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Issue Time Tracking
-------------------
Worklog Id: (was: 155012)
Time Spent: 4h 40m (was: 4.5h)
> 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: 4h 40m
> 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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