[FLINK-14981] web frontend support dynamic adjustment of the log level

• Type: Improvement
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Affects Version/s: 1.7.2, 1.8.2, 1.9.1
• Component/s: Runtime / Web Frontend
• Labels: auto-deprioritized-major auto-deprioritized-minor features
• Release Note: web frontend support dynamic adjustment of the log level
• Flags: Important
• Assignee: Unassigned
• Reporter: liu
• Created: 28/Nov/19 02:17
• Updated: 20/Nov/21 22:38

Description

In a production environment, sometimes the application behaves differently than expected, which requires the log debugging mode to be turned on to locate the problem. If the debug log is turned on when the program is started, the amount of data will be very large, causing the web frontend to crash. If it is not turned on, the program is a black box and cannot be debugged.
Can flink support dynamic adjustment of the log level like Storm and set the expiration time at the same time.  the original log level will be restored as soon as the time expires. This will not make the program run like a black box, nor  print too many logs.