[jira] [Commented] (SAMZA-1322) Propagate watermark messages

["Xinyu Liu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SAMZA-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16261365#comment-16261365 ] 

Xinyu Liu commented on SAMZA-1322:
----------------------------------

Dup of SAMZA-1386. Close the ticket.

> Propagate watermark messages
> ----------------------------
>
>                 Key: SAMZA-1322
>                 URL: https://issues.apache.org/jira/browse/SAMZA-1322
>             Project: Samza
>          Issue Type: Task
>    Affects Versions: 0.14.0
>            Reporter: Xinyu Liu
>            Assignee: Xinyu Liu
>
> TaskInstance will aggregate watermark messages based on counting the upstream tasks, and calculate the result watermark based on the following equation:
> InputWatermark = min { OutputWatermark(task) for each task in upstream tasks }
> Then it will deliver the water to the task. The task will process the watermark and finally send it again to downstreams based on stream graph topology.



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