[jira] [Commented] (APEXCORE-60) Iterative processing support

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[jira] [Commented] (APEXCORE-60) Iterative processing support

JIRA jira@apache.org

    [ https://issues.apache.org/jira/browse/APEXCORE-60?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15157589#comment-15157589 ]

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_r53682491
 
    --- Diff: demos/iteration/src/test/java/com/datatorrent/demos/iteration/ApplicationTest.java ---
    @@ -0,0 +1,43 @@
    +/**
    + * 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.Test;
    +
    +import com.datatorrent.api.LocalMode;
    +
    +
    +/**
    + *
    + */
    +public class ApplicationTest
    +{
    +  @Test
    +  public void testSomeMethod() throws Exception
    +  {
    +  LocalMode lma = LocalMode.newInstance();
    +    Configuration conf =new Configuration(false);
    +    lma.prepareDAG(new Application(), conf);
    +    LocalMode.Controller lc = lma.getController();
    +    lc.run(10000);
    --- End diff --
   
    Done. Please merge if there are no other problems


> 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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