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https://issues.apache.org/jira/browse/LOG4NET-485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261896#comment-15261896
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Christoph Herzog commented on LOG4NET-485:
------------------------------------------
Tested with 1.2.15, definitly not fixed.
The whole part which is reponsible for rolling/creating of files needs to be
garded by locks!
Worst case, when logging from multiple processes, is that the call to Log is
stuck
{quote}
mscorlib.dll!System.Threading.WaitHandle.WaitOne() Unknown
log4net.dll!log4net.Appender.RollingFileAppender.AdjustFileBeforeAppend()
Unknown
log4net.dll!log4net.Appender.RollingFileAppender.Append(log4net.Core.LoggingEvent
loggingEvent) Unknown
log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend(log4net.Core.LoggingEvent
loggingEvent) Unknown
log4net.dll!log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(log4net.Core.LoggingEvent
loggingEvent) Unknown
log4net.dll!log4net.Repository.Hierarchy.Logger.CallAppenders(log4net.Core.LoggingEvent
loggingEvent) Unknown
log4net.dll!log4net.Repository.Hierarchy.Logger.ForcedLog(System.Type
callerStackBoundaryDeclaringType, log4net.Core.Level level, object message,
System.Exception exception) Unknown
log4net.dll!log4net.Repository.Hierarchy.Logger.Log(System.Type
callerStackBoundaryDeclaringType, log4net.Core.Level level, object message,
System.Exception exception) Unknown
log4net.dll!log4net.Core.LogImpl.WarnFormat(string format, object arg0,
object arg1, object arg2) Unknown
{quote}
The normal logging, will also generate errors, in this case the file is not
rolled, but instead the logfile is rewritten
{quote}
log4net:ERROR RollingFileAppender: INTERNAL ERROR. Append is False but
OutputFile [C:\Temp\log\myLog.txt] already exists.
log4net:WARN Cannot RollFile [C:\Temp\log\myLog.1.txt] ->
[C:\Temp\log\myLog.2.txt]. Source does not exist
log4net:ERROR RollingFileAppender: INTERNAL ERROR. Append is False but
OutputFile [C:\Temp\log\myLog.txt] already exists.
log4net:WARN Cannot RollFile [C:\Temp\log\myLog.2.txt] ->
[C:\Temp\log\myLog.3.txt]. Source does not exist
log4net:WARN Cannot RollFile [C:\Temp\log\myLog.1.txt] ->
[C:\Temp\log\myLog.2.txt]. Source does not exist
log4net:ERROR RollingFileAppender: INTERNAL ERROR. Append is False but
OutputFile [C:\Temp\log\myLog.txt] already exists.
{quote}
> RollingFileAppender cannot be used by multiple process
> ------------------------------------------------------
>
> Key: LOG4NET-485
> URL: https://issues.apache.org/jira/browse/LOG4NET-485
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.13, 1.2.14, 1.3.0
> Reporter: NN
> Assignee: Dominik Psenner
> Fix For: 1.2.14
>
>
> RollingFileAppender doesn't acquire lock when rolling takes place.
> As a consequence running multiple instances of the same program rewrites the
> same log file instead of making a roll for everyone.
> There is FileAppender.InterProcessLock but it only protects writes and not
> rolls.
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