[jira] [Commented] (LOG4NET-465) Rolling log files get overwritten when IIS is restarted

["Wolfgang Knauf (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4NET-465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17803333#comment-17803333 ] 

Wolfgang Knauf commented on LOG4NET-465:
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Is this still relevant in 2.0.15 and .NET6? I found this issue when researching a similar issue. But for me, it turned out to be a problem in my log4net config file. After changing the config, the rolling log files are kept after an app restart. So I hope it was fixed in the meantime.

For the records: in my problematic config i had defined the file extension as part of the date pattern (found this hint somewhere in the web years ago) - but it caused problems with size rolling log files:
{quote}  <appender name="InformationAppender" type="log4net.Appender.RollingFileAppender">
    <file value="logfile_" />
    <appendToFile value="true" />
    <rollingStyle value="Composite" />
    <maximumFileSize value="50MB"/>
    <maxSizeRollBackups value="10"/>
    <preserveLogFileNameExtension value="true"/>    
    <staticLogFileName value="false" />
    <datePattern value="{color:#de350b}yyyy-MM'.log'{color}" />
  </appender>
{quote}
 

And this is the working config (thanks to the creator of this bug anyway, as it pointed me in the right direction):
{quote}  <appender name="InformationAppender" type="log4net.Appender.RollingFileAppender">
    <file value="logfile_.log" />
    <appendToFile value="true" />
    <rollingStyle value="Composite" />
    <maximumFileSize value="50MB"/>
    <maxSizeRollBackups value="10"/>
    <preserveLogFileNameExtension value="true"/>    
    <staticLogFileName value="false" />
    <datePattern value="yyyy-MM" />
  </appender>
{quote}
My only difference to the config file from the initial bugreport: I use the default "CountDirection".

> Rolling log files get overwritten when IIS is restarted
> -------------------------------------------------------
>
>                 Key: LOG4NET-465
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-465
>             Project: Log4net
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 1.2.13
>         Environment: asp.net 4.0
>            Reporter: Michel Emond
>            Priority: Major
>         Attachments: RollingFileAppender.diff, config.xml
>
>
> This is the issue described in LOG4NET-378
> h2. Reproduction steps
> # Setup a web application using the settings from the attached config.xml file
> # Notice the rolling style set to Composite
> # Start and use the application
> # The log files pile up in the folder
> # Restart IIS
> # 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
> h2. 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:
> {code}
> DetermineCurSizeRollBackups()
> |
> +--GetExistingFiles()
> |  +--GetWildcardPatternForFile()
> |
> +--InitializeRollBackups()
>    +--InitializeFromOneFile()
> {code}



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