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https://issues.apache.org/jira/browse/SAMZA-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xinyu Liu resolved SAMZA-1322.
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Resolution: Duplicate
> 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
> Fix For: 0.14.0
>
>
> 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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