[FLINK-3427] Add watermark monitoring to JobManager web frontend

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Component/s: API / DataStream, Runtime / Web Frontend
• Assignee: Unassigned
• Reporter: Robert Metzger
• Created: 17/Feb/16 10:58
• Updated: 03/Apr/17 15:07
• Resolved: 03/Apr/17 12:27

Description

Currently, its quite hard to figure out issues with the watermarks.

I think we can improve the situation by reporting the following information through the metrics system:

• Report the current low watermark for each operator (this way, you can see if one operator is preventing the watermarks to rise)
• Report the number of events arrived after the low watermark (users can see how accurate the watermarks are)

Issue Links

• links to: GitHub Pull Request #3366