* glog: add --log_rotate_hours flag for time-based log rotation
SeaweedFS previously only rotated log files when they reached MaxSize
(1.8 GB). Long-running deployments with low log volume could accumulate
log files indefinitely with no way to force rotation on a schedule.
This change adds the --log_rotate_hours flag. When set to a non-zero
value, the current log file is rotated once it has been open for the
specified number of hours, regardless of its size.
Implementation details:
- New flag --log_rotate_hours (int, default 0 = disabled) in glog_file.go
- Added createdAt time.Time field to syncBuffer to track file open time
- rotateFile() sets createdAt to the time the new file is opened
- Write() checks elapsed time and triggers rotation when the threshold
is exceeded, consistent with the existing size-based check
This resolves the long-standing request for time-based rotation and
helps prevent unbounded log accumulation in /tmp on production systems.
Related: #3455, #5763, #8336
* glog: default log_rotate_hours to 168 (7 days)
Enable time-based rotation by default so log files don't accumulate
indefinitely in long-running deployments. Set to 0 to disable.
* glog: simplify rotation logic by combining size and time conditions
Merge the two separate rotation checks into a single block to
eliminate duplicated rotateFile error handling.
* glog: use timeNow() in syncBuffer.Write and add time-based rotation test
Use the existing testable timeNow variable instead of time.Now() in
syncBuffer.Write so that time-based rotation can be tested with a
mocked clock.
Add TestTimeBasedRollover that verifies:
- no rotation occurs before the interval elapses
- rotation triggers after the configured hours
---------
Co-authored-by: Copilot <copilot@github.com>
bd3a6b1b33