[LOG4NET-465] Rolling log files get overwritten when IIS is restarted

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.2.13
• Component/s: Appenders
• Environment: asp.net 4.0
• Assignee: Unassigned
• Reporter: Michel Emond
• Created: 22/Jun/15 19:08
• Updated: 04/Jan/24 21:27

Description

This is the issue described in LOG4NET-378

Reproduction steps

1. Setup a web application using the settings from the attached config.xml file
2. Notice the rolling style set to Composite
3. Start and use the application
4. The log files pile up in the folder
5. Restart IIS
6. Keep using the application

Expected result

• The rolling continues on or after the last file

Actual result

• The rolling restarts at index 1 and overwrites the existing files

Solution

See the attached files:

• config.xml
• patch with a fix proposal

The original bug fix addresses the issue in the InitializeFromOneFile() method.
However, the GetWildcardPatternForFile() method also needs the baseFileName to be adjusted with the datePattern so the proper files are searched.
I placed a file path fix in the DetermineCurSizeRollBackups() method, so it's then passed down to the two other methods and everyone gets happy.

Here's a calling stack sample:

DetermineCurSizeRollBackups()
|
+--GetExistingFiles()
|  +--GetWildcardPatternForFile()
|
+--InitializeRollBackups()
   +--InitializeFromOneFile()

Issue Links

• relates to: LOG4NET-378 Rolling log file is overwritten when application is restarted