[jira] [Created] (FLINK-3376) Add an illustration of Event Time and Watermarks to the docsq

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-3376:
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             Summary: Add an illustration of Event Time and Watermarks to the docsq
                 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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