RollingFileAppenders that log to a network share from a web application fail to
resume logging in the event the network share is
disconnected/reconnected/failsover
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Key: LOG4NET-103
URL: http://issues.apache.org/jira/browse/LOG4NET-103
Project: Log4net
Issue Type: Bug
Components: Appenders
Affects Versions: 1.2.10, 1.2.9
Environment: Windows 2003, ASP.NET, C#
Reporter: Kenneth Oberleitner
We have seen an issue when logging from our web applications to a clustered SAN
which fails over to a backup. I have recreated the scenario locally with two
machines and writing a log file to a network share.
1) Enabled internal logging in log4net to a local file on MACHINE-C
2) Set up a share on MACHINE-B, and started a web application logging to that
share from MACHINE-C; logs appeared on the share as expected
3) Disabled the share on MACHINE-B, refreshed the web application, the
following error was reported in log4net's internal debugging
log4net:ERROR [RollingFileAppender] Failed in DoAppend
System.IO.IOException: The handle is invalid.
at System.IO.__Error.WinIOError(Int32 errorCode, String str)
at System.IO.FileStream.WriteCore(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.FileStream.FlushWrite()
at System.IO.FileStream.Flush()
at log4net.Appender.LockingStream.Flush()
at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
at System.IO.StreamWriter.Flush()
at log4net.Util.TextWriterAdapter.Flush()
at log4net.Appender.FileAppender.Append(LoggingEvent loggingEvent)
at log4net.Appender.RollingFileAppender.Append(LoggingEvent loggingEvent)
at log4net.Appender.AppenderSkeleton.DoAppend(LoggingEvent loggingEvent)
4) Re-enabled the share on MACHINE-B, refreshed the web application; no logging
appeared in the shared log file, and the following error appeared in log4nets
internal debugging
log4net:ERROR [RollingFileAppender] Failed in DoAppend
System.ObjectDisposedException: Cannot access a closed file.
at System.IO.__Error.FileNotOpen()
at System.IO.FileStream.Write(Byte[] array, Int32 offset, Int32 count)
at log4net.Appender.LockingStream.Write(Byte[] buffer, Int32 offset, Int32
count)
at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
at System.IO.StreamWriter.Flush()
at log4net.Util.TextWriterAdapter.Flush()
at log4net.Appender.FileAppender.Append(LoggingEvent loggingEvent)
at log4net.Appender.RollingFileAppender.Append(LoggingEvent loggingEvent)
at log4net.Appender.AppenderSkeleton.DoAppend(LoggingEvent loggingEvent)
5) Touched web.config, refreshed the web application; no logging appeared in
the shared log file, and the following errors appeared in log4net's internal
debugging
log4net: Hierarchy: Shutdown called on Hierarchy [log4net-default-repository]
log4net:ERROR [RollingFileAppender] Could not close writer
[log4net.Util.CountingQuietTextWriter]
System.ObjectDisposedException: Cannot access a closed file.
at System.IO.__Error.FileNotOpen()
at System.IO.FileStream.Flush()
at log4net.Appender.LockingStream.Flush()
at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
at System.IO.StreamWriter.Dispose(Boolean disposing)
at System.IO.StreamWriter.Close()
at log4net.Util.TextWriterAdapter.Close()
at log4net.Util.QuietTextWriter.Close()
at log4net.Appender.TextWriterAppender.CloseWriter()
...
log4net:ERROR [RollingFileAppender] Unable to acquire lock on file
\\MACHINE-B\Log\log-file.txt. The process cannot access the file
"\\MACHINE-B\Log\log-file.txt" because it is being used by another process.
log4net:ERROR [RollingFileAppender] OpenFile(\\MACHINE-B\Log\log-file.txt,True)
call failed.
LockStateException: The file is not currently locked
at log4net.Appender.LockingStream.AssertLocked()
at log4net.Appender.LockingStream.get_CanWrite()
at System.IO.StreamWriter..ctor(Stream stream, Encoding encoding, Int32
bufferSize)
at System.IO.StreamWriter..ctor(Stream stream, Encoding encoding)
at log4net.Appender.FileAppender.OpenFile(String fileName, Boolean append)
at log4net.Appender.RollingFileAppender.OpenFile(String fileName, Boolean
append)
at log4net.Appender.FileAppender.SafeOpenFile(String fileName, Boolean
append)
...
log4net:ERROR [RollingFileAppender] Unable to acquire lock on file
\\MACHINE-B\Log\log-file.txt. The process cannot access the file
"\\MACHINE-B\Log\log-file.txt" because it is being used by another process.
log4net:ERROR [RollingFileAppender] OpenFile(\\MACHINE-B\Log\log-file.txt,True)
call failed.
LockStateException: The file is not currently locked
at log4net.Appender.LockingStream.AssertLocked()
at log4net.Appender.LockingStream.get_CanWrite()
at System.IO.StreamWriter..ctor(Stream stream, Encoding encoding, Int32
bufferSize)
at System.IO.StreamWriter..ctor(Stream stream, Encoding encoding)
at log4net.Appender.FileAppender.OpenFile(String fileName, Boolean append)
at log4net.Appender.RollingFileAppender.OpenFile(String fileName, Boolean
append)
at log4net.Appender.FileAppender.SafeOpenFile(String fileName, Boolean
append)
log4net:ERROR [RollingFileAppender] No output stream or file set for the
appender named [AppRollingFileAppender].
6) Performed an iisreset; logging then appeared in the shared log and no errors
in the log4net internal debugging
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