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Posted to dev@gearpump.apache.org by "Kam Kasravi (JIRA)" <ji...@apache.org> on 2016/05/13 15:42:13 UTC

[jira] [Updated] (GEARPUMP-78) Support DAG with loops

     [ https://issues.apache.org/jira/browse/GEARPUMP-78?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kam Kasravi updated GEARPUMP-78:
--------------------------------
    Assignee: Manu Zhang

> Support DAG with loops
> ----------------------
>
>                 Key: GEARPUMP-78
>                 URL: https://issues.apache.org/jira/browse/GEARPUMP-78
>             Project: Apache Gearpump
>          Issue Type: Improvement
>          Components: streaming
>            Reporter: Manu Zhang
>            Assignee: 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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