[FLINK-22641] The description of watermark in the Timely Stream Processing directory of Concepts in Flink 1.13.0

• Type: Improvement
• Status: Reopened
• Priority: Minor
• Resolution: Unresolved
• Component/s: Documentation
• Assignee: Unassigned
• Reporter: 金翔
• Created: 12/May/21 07:06
• Updated: 12/May/21 07:46

Description

In the Flink 1.13.0 document, in the Timely Stream Processing document Event Time and Watermarks (https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/concepts/time/#event-time-and-watermarks) describe the disorder of watermark and event timestamp. because A Watermark(t) declares that event time has reached time t in that stream, meaning that there should be no more elements from the stream with a timestamp t' <= t (i.e. events with timestamps older or equal to the watermark). When w (11) arrives, e (14) and E (15) should change their positions. Similarly, E(19) and E (22) should switch positions when w (17) arrives。The original and modified drawings are attached, thank you！！！