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https://issues.apache.org/jira/browse/APEXCORE-60?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15113972#comment-15113972
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ASF GitHub Bot commented on APEXCORE-60:
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GitHub user davidyan74 opened a pull request:
https://github.com/apache/incubator-apex-malhar/pull/177
APEXCORE-60 added iteration demo (DO NOT MERGE)
This requires Apex Core 3.3.0, which hasn't been released yet. I will
issue another pull request after Apex Core 3.3.0 is released.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davidyan74/incubator-apex-malhar APEXCORE-60
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-apex-malhar/pull/177.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #177
----
commit f97693a2f4d708839d379839dec31b9bd0a26102
Author: David Yan <[email protected]>
Date: 2015-11-19T21:20:38Z
APEXCORE-60 added iteration demo
----
> 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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