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https://issues.apache.org/jira/browse/FLINK-5375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai reassigned FLINK-5375:
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Assignee: Tzu-Li (Gordon) Tai
> Fix watermark documentation
> ---------------------------
>
> Key: FLINK-5375
> URL: https://issues.apache.org/jira/browse/FLINK-5375
> Project: Flink
> Issue Type: Bug
> Components: Documentation, Project Website
> Affects Versions: 1.2.0, 1.1.3, 1.3.0
> Reporter: Fabian Hueske
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Critical
> Fix For: 1.2.0, 1.3.0, 1.1.5
>
>
> The [documentation of
> watermarks|https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/event_time.html#event-time-and-watermarks]
> is not correct. It states
> {quote}
> A Watermark(t) declares that event time has reached time t in that stream,
> meaning that all events with a timestamps t’ < t have occurred.
> {quote}
> whereas the JavaDocs which is aligned with implementation says
> {quote}
> A Watermark tells operators that receive it that no elements with a
> timestamp older or equal to the watermark timestamp should arrive at the
> operator.
> {quote}
> The documentation needs to be updated. Moreover, we need to carefully check
> that the watermark semantics are correctly described in other pages of the
> documentation and blog posts published on the Flink website.
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