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https://issues.apache.org/jira/browse/FLINK-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15138781#comment-15138781
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Stephan Ewen commented on FLINK-3376:
-------------------------------------
Some of that information is available, but hidden deep in the Streaming API
guide.
I vote to link this page on the same level as the Batch and Streaming API guide
> Add an illustration of Event Time and Watermarks to the docs
> ------------------------------------------------------------
>
> Key: FLINK-3376
> URL: https://issues.apache.org/jira/browse/FLINK-3376
> Project: Flink
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 0.10.1
> Reporter: Stephan Ewen
> Priority: Critical
> Fix For: 1.0.0
>
>
> Users seem to get confused about how event time and watermarks work.
> We need to add documentation with two sections:
> 1. Event time and watermark progress in general
> - Watermarks are generated at the sources
> - How Watermarks progress through the streaming data flow
> 2. Ways that users can generate watermarks
> - EventTimeSourceFunctions
> - AscendingTimestampExtractor
> - TimestampExtractor general case
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