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https://issues.apache.org/jira/browse/GEARPUMP-78?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251544#comment-15251544
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Manu Zhang commented on GEARPUMP-78:
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We already allow users to submit a Graph with cycle but the messages are sent
through "unmanaged" channel.
> https://github.com/gearpump/gearpump/issues/1231
> ------------------------------------------------
>
> Key: GEARPUMP-78
> URL: https://issues.apache.org/jira/browse/GEARPUMP-78
> Project: Apache Gearpump
> Issue Type: Improvement
> Components: streaming
> Reporter: Manu Zhang
>
> imported from [https://github.com/gearpump/gearpump/issues/1231] on behalf of
> [~clockfly],
> DAG with loop should not be called DAG :)
> We see use cases that require a feedback channel.
> The challengues will be:
> # how to support the low watermark clock? As the clock is defined recursively?
> # How to support back-pressure. DAG with loop can possiblely create a
> live-lock issue. With each processor wait for acks from other processor
> before sending acks.
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