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https://issues.apache.org/jira/browse/APEXCORE-60?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159326#comment-15159326
]
ASF GitHub Bot commented on APEXCORE-60:
----------------------------------------
Github user davidyan74 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/177#discussion_r53821318
--- Diff:
demos/iteration/src/test/java/com/datatorrent/demos/iteration/ApplicationTest.java
---
@@ -0,0 +1,81 @@
+/**
+ * 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 com.datatorrent.demos.iteration;
+
+
+import org.apache.hadoop.conf.Configuration;
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.datatorrent.api.LocalMode;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+
+
+/**
+ *
+ */
+public class ApplicationTest
+{
+ @Test
+ public void testIterationApp() throws Exception
+ {
+ LocalMode lma = LocalMode.newInstance();
+ Configuration conf = new Configuration(false);
+ Application app = new Application();
+ String outputFileName = "target/output.txt";
+ new File(outputFileName).delete();
+ app.setExtraOutputFileName(outputFileName);
+ lma.prepareDAG(app, conf);
+ LocalMode.Controller lc = lma.getController();
+ lc.runAsync();
+ while (true) {
--- End diff --
@tweise added timeout
> Iterative processing support
> ----------------------------
>
> Key: APEXCORE-60
> URL: https://issues.apache.org/jira/browse/APEXCORE-60
> Project: Apache Apex Core
> Issue Type: New Feature
> Reporter: David Yan
> Assignee: David Yan
> Labels: roadmap
> Fix For: 3.3.0
>
> Attachments: Iteration Support in Apex.pdf
>
>
> We would like to support iterative processing by introducing cycles in the
> graph (known as DAG now, but no longer if we support iterative processing).
> Initial idea is as follow:
> {noformat}
> |----|
> v |
> A -> B -> C -> D
> ^ |
> |---------|
> {noformat}
> C has two separate backward streams to A and B. The input ports of A and B
> that C connects to will have a special attribute on how many window IDs ahead
> the incoming windows should be treated as, and A and B will be responsible
> for the initial data for such input ports.
> Another idea is to have C advance the window ID on its output ports and have
> C generate the initial data on its output ports to A and B.
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