[FLINK-4121] Add timeunit (ms) to docs for timestamps and watermarks

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Component/s: API / DataStream
• Assignee: Unassigned
• Reporter: Jonas Traub
• Created: 27/Jun/16 09:18
• Updated: 13/Apr/21 20:39
• Resolved: 27/Jun/16 10:11

Description

I'm teaching a class where students are supposed to implement Flink streaming programs. It seems to be unclear for them, that the time unit of timestamps and watermarks is milliseconds.

They just see TimeWindow.seconds(...) or something similar and assume the timestamps to be of the same unit (seconds) which is obviously not the case.

I just checked the documentation and there is no explicit specification of the time unit used for timestamps.

After short talk with aljoscha, I'll open a mini-PR to address this issue.

Issue Links

• links to: GitHub Pull Request #2165