[FLINK-35069] ContinuousProcessingTimeTrigger continuously registers timers in a loop at the end of the window

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.17.0
• Fix Version/s: 1.20.0, 1.19.2, 2.0-preview
• Component/s: API / DataStream
• Labels: pull-request-available
• Assignee: Jinzhong Li
• Reporter: Jinzhong Li
• Created: 09/Apr/24 12:24
• Updated: 02/Sep/24 09:35
• Resolved: 01/Aug/24 06:00

Description

In our production environment,  when TumblingEventTimeWindows and ContinuousProcessingTimeTrigger are used in combination within a WindowOperator, we observe a situation where the timers are continuously registered in a loop at the end of the window, leading to the job being perpetually stuck in timer processing.

This issue can be reproduced using the UT provided by the pr.

Issue Links

• is related to: FLINK-20443 ContinuousProcessingTimeTrigger doesn't fire at the end of the window
• links to: GitHub Pull Request #24647