[jira] [Created] (FLINK-3379) Refactor TimestampExtractor

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-3379:
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             Summary: Refactor TimestampExtractor
                 Key: FLINK-3379
                 URL: https://issues.apache.org/jira/browse/FLINK-3379
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
    Affects Versions: 0.10.1
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
            Priority: Critical
             Fix For: 1.0.0


Based on a lot of user feedback, the current {{TimestampExtractor}} seems very confusing. It implements simultaneously two modes of generating watermarks:

  - Each record that passes through can decide to cause a watermark.

  - The timestamp extractor can define a certain watermark timestamp which is periodically picked up by the system and triggers a watermark (if larger than the previous watermark).

Figuring out how these modes interplay, and how to define the methods to only use one mode has been quite an obstacle for several users. We should break this class into two different classes, one per mode of generating watermarks, to make it easier to understand.



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