Fabian Hueske created FLINK-5375:
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Summary: 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: 1.1.3, 1.2.0, 1.3.0
Reporter: Fabian Hueske
Priority: Critical
Fix For: 1.2.0, 1.1.4, 1.3.0
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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