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From "Manu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GEARPUMP-78) https://github.com/gearpump/gearpump/issues/1231
Date Thu, 21 Apr 2016 08:22:25 GMT
Manu Zhang created GEARPUMP-78:
----------------------------------

             Summary: 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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