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https://issues.apache.org/jira/browse/LOG4NET-506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194865#comment-15194865
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Dominik Psenner commented on LOG4NET-506:
-----------------------------------------
Long story short, LOG4NET-487 would not solve this issue but could provide yet
another workaround that would work in your case because you have "AppXXX" in
your datePatterns. The mutex name generator has to consider the datePattern
property if rollingStyle is composite or time based.
> RollingFileAppender locking log folder in some cases
> ----------------------------------------------------
>
> Key: LOG4NET-506
> URL: https://issues.apache.org/jira/browse/LOG4NET-506
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.15
> Environment: Windows Server 2008 R2, Windows Server 2012 R2
> Reporter: Frédéric Delaporte
> Priority: Minor
> Attachments: AppAlone_log4net.txt, AppConcurrently_log4net.txt
>
>
> *Abstract:*
> In some configuration cases, the rolling file appender may issue a mutex lock
> on the folder name. If more than one processes try to do that with different
> executing identity, only one will be able to log to its specific logs file.
> The others will no more be able to do it.
> *Repro:*
> Many applications run on the same server.
> All run under different windows identity.
> All do log through {{RollingFileAppender}} to D:\Logs\ (value of {{file}}
> configuration node) to their own file log (filename specific to each
> application through {{datePattern}} configuration node, like
> {{yyyy.MM.dd'-App1.log'}}, {{yyyy.MM.dd'-App2.log'}}, ...).
> They log through {{AdoNetAppender}} too.
> Since having upgraded Log4Net from 1.2.13 to 1.2.15 on some applications,
> they cease being able to all log to D:\Logs\. Only one of them still do log,
> depending on which have started first. SQL logs still work. Non upgraded
> applications are still able to log to D:\Logs\, whatever their start order
> have been.
> *Diagnosis info:*
> Activating log4net debug trace on an application, and comparing failure cases
> to working cases, yields following diff:
> {code:title=failing case debug trace}
> log4net:ERROR Could not create Appender [RollingLogFileAppender] of type
> [log4net.Appender.RollingFileAppender]. Reported error follows.
> System.UnauthorizedAccessException: Access to path 'D__Logs_' denied.
> (Translated from french)
> à System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
> à System.Threading.Mutex.MutexTryCodeHelper.MutexTryCode(Object userData)
> à
> System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode
> code, CleanupCode backoutCode, Object userData)
> à System.Threading.Mutex.CreateMutexWithGuaranteedCleanup(Boolean
> initiallyOwned, String name, Boolean& createdNew, SECURITY_ATTRIBUTES
> secAttrs)
> à System.Threading.Mutex..ctor(Boolean initiallyOwned, String name,
> Boolean& createdNew, MutexSecurity mutexSecurity)
> à System.Threading.Mutex..ctor(Boolean initiallyOwned, String name,
> Boolean& createdNew)
> à log4net.Appender.RollingFileAppender.ActivateOptions()
> à
> log4net.Repository.Hierarchy.XmlHierarchyConfigurator.ParseAppender(XmlElement
> appenderElement)
> log4net:ERROR Appender named [RollingLogFileAppender] not found.
> {code}
> {code:title=working case corresponding trace}
> log4net: Searched for existing files in [D:\Logs]
> log4net: curSizeRollBackups starts at [0]
> log4net: Opening file for writing [D:\Logs\2016.02.26-App1.log] append [True]
> log4net: Created Appender [RollingLogFileAppender]
> log4net: Adding appender named [RollingLogFileAppender] to logger [root].
> {code}
> (All other trace lines are identical)
> {code:xml|title=Application appender configuration}
> <appender name="RollingLogFileAppender"
> type="log4net.Appender.RollingFileAppender">
> <file value="D:\Logs\" />
> <datePattern value="yyyy.MM.dd'-App1.log'" />
> <staticLogFileName value="false" />
> <appendToFile value="true" />
> <rollingStyle value="Composite" />
> <maxSizeRollBackups value="10" />
> <maximumFileSize value="5MB" />
> <layout type="log4net.Layout.PatternLayout">
> <conversionPattern value="%date [%thread] %-5level %logger - %message -
> %property%newline%exception" />
> </layout>
> </appender>
> {code}
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