上周,我们的一个测试服务器的日志驱动器上的磁盘空间不足。在释放磁盘空间后,我仍然有几个带有调用堆栈的线程似乎被卡在log4net AppenderSkeleton.DoAppend中,这让人感到困惑,因为我期望log4net是线程安全的。
理解为什么log4net似乎被这么多线程所困扰的任何帮助都表示赞赏。
这是一个示例调用堆栈,显示在DoAppend内部等待时阻塞的线程:
ntdll.dll!_ NtWaitForMultipleObjects @ 20()+ 0x15 bytes
ntdll.dll!_NtWaitForMultipleObjects@20()+ 0x15 bytes
KERNELBASE.dll!_WaitForMultipleObjectsEx@20()+ 0x36字节 kernel32.dll!_WaitForMultipleObjectsExImplementation@20()+ 0x8e个字节 [管理到原生过渡]
log4net.dll!log4net.Appender。 AppenderSkeleton.DoAppend (log4net.Core.LoggingEvent loggingEvent)+ 0x3e bytes log4net.dll!log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(log4net.Core.LoggingEvent loggingEvent)+ 0xa0 bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.CallAppenders(log4net.Core.LoggingEvent loggingEvent)+ 0xa9 bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.ForcedLog(System.Type callerStackBoundaryDeclaringType,log4net.Core.Level level,object message,System.Exception exception)+ 0x4a bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.Log(System.Type callerStackBoundaryDeclaringType,log4net.Core.Level level,object message,System.Exception exception)+ 0x5e bytes
log4net.dll!log4net.Core.LogImpl.Info(对象消息)+ 0x27字节
以下是log4net AppenderSkeleton.DoAppend
的来源public void DoAppend(LoggingEvent loggingEvent)
{
// This lock is absolutely critical for correct formatting
// of the message in a multi-threaded environment. Without
// this, the message may be broken up into elements from
// multiple thread contexts (like get the wrong thread ID).
lock(this)
{
if (m_closed)
{
ErrorHandler.Error("Attempted to append to closed appender named ["+m_name+"].");
return;
}
// prevent re-entry
if (m_recursiveGuard)
{
return;
}
try
{
m_recursiveGuard = true;
if (FilterEvent(loggingEvent) && PreAppendCheck())
{
this.Append(loggingEvent);
}
}
catch(Exception ex)
{
ErrorHandler.Error("Failed in DoAppend", ex);
}
#if !MONO && !NET_2_0
// on .NET 2.0 (and higher) and Mono (all profiles),
// exceptions that do not derive from System.Exception will be
// wrapped in a RuntimeWrappedException by the runtime, and as
// such will be catched by the catch clause above
catch
{
// Catch handler for non System.Exception types
ErrorHandler.Error("Failed in DoAppend (unknown exception)");
}
#endif
finally
{
m_recursiveGuard = false;
}
}
}
以下是我的log4net设置:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net xsi:noNamespaceSchemaLocation="log4net.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="g:\logfiles\mySerivceName\" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="'myServiceName.'yyyy-MM-dd-HH'-00.log'"/>
<staticLogFileName value="false" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{yyyy-MM-dd HH:mm:ss.fff} %-5level [%3thread] [%-50.50stacktrace] %message %newline"/>
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="INFO" />
<levelMax value="FATAL" />
</filter>
</appender>
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="alerts@myCompanyName.com" />
<from value="servicename@localnetwork" />
<subject value="${COMPUTERNAME} - Error Generated" />
<smtpHost value="mySmtpServerIpAddress" />
<bufferSize value="2" />
<lossy value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{yyyy-MM-dd HH:mm:ss.fff} %-5level [%3thread] [%-50.50stacktrace] %message %newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="ERROR" />
<levelMax value="FATAL" />
</filter>
</appender>
<root>
<level value="DEBUG"/>
<appender-ref ref="RollingFileAppender" />
</root>
</log4net>
</configuration>
正在转移到新文件的DoAppend堆栈
mscorlib.dll!System.Text.StringBuilder.Append(char value) Line 953 + 0xb bytes mscorlib.dll!System.IO.PathHelper.Append(char value) Line 139 + 0x18 bytes mscorlib.dll!System.IO.Path.NormalizePath(string path, bool fullCheck, int maxPathLength, bool expandShortPaths) Line 620 mscorlib.dll!System.IO.Path.GetDirectoryName(string path) Line 170 + 0x24 bytes log4net.dll!log4net.Appender.FileAppender.LockingModelBase.CreateStream(string filename, bool append, System.IO.FileShare fileShare) + 0x35 bytes log4net.dll!log4net.Appender.FileAppender.ExclusiveLock.OpenFile(string filename, bool append, System.Text.Encoding encoding) + 0x2d bytes log4net.dll!log4net.Appender.FileAppender.OpenFile(string fileName, bool append) + 0x1ac bytes log4net.dll!log4net.Appender.RollingFileAppender.OpenFile(string fileName, bool append) + 0x189 bytes log4net.dll!log4net.Appender.FileAppender.SafeOpenFile(string fileName, bool append) + 0x2d bytes log4net.dll!log4net.Appender.FileAppender.PrepareWriter() + 0x13 bytes log4net.dll!log4net.Appender.TextWriterAppender.PreAppendCheck() + 0x32 bytes log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend(log4net.Core.LoggingEvent loggingEvent) + 0xe0 bytes log4net.dll!log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(log4net.Core.LoggingEvent loggingEvent) + 0xa0 bytes log4net.dll!log4net.Repository.Hierarchy.Logger.CallAppenders(log4net.Core.LoggingEvent loggingEvent) + 0xa9 bytes log4net.dll!log4net.Repository.Hierarchy.Logger.ForcedLog(System.Type callerStackBoundaryDeclaringType, log4net.Core.Level level, object message, System.Exception exception) + 0x4a bytes log4net.dll!log4net.Repository.Hierarchy.Logger.Log(System.Type callerStackBoundaryDeclaringType, log4net.Core.Level level, object message, System.Exception exception) + 0x5e bytes log4net.dll!log4net.Core.LogImpl.Info(object message) + 0x27 bytes
这是同一台机器上的另一个调用堆栈,不同的进程,也挂起了:
clr.dll!AwareLock :: Contention()+ 0x10d bytes
[管理到原生过渡]
log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend(log4net.Core.LoggingEvent loggingEvent)+ 0x3e bytes log4net.dll!log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(log4net.Core.LoggingEvent loggingEvent)+ 0xa0 bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.CallAppenders(log4net.Core.LoggingEvent loggingEvent)+ 0xa9 bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.ForcedLog(System.Type callerStackBoundaryDeclaringType,log4net.Core.Level level,object message,System.Exception exception)+ 0x4a bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.Log(System.Type callerStackBoundaryDeclaringType,log4net.Core.Level level,object message,System.Exception exception)+ 0x5e bytes
log4net.dll!log4net.Core.LogImpl.Info(对象消息)+ 0x27字节
在同一台机器上的第二个进程中,还有一个线程似乎被阻止尝试翻转。
MSVCR120_CLR0400.dll!_memcpy()+ 0x21e bytes
[管理到原生过渡]
mscorlib.dll!System.Buffer._Memcpy(byte * dest,byte * src,int len)484行+ 0x20字节C# mscorlib.dll!System.Buffer.Memcpy(byte * dest,byte * src,int len)第401行C# mscorlib.dll!string.FillStringChecked(string dest,int destPos,string src)第1523行+ 0xf字节C# mscorlib.dll!string.ConcatArray(string [] values,int totalLength)Line 3340 C# mscorlib.dll!string.Concat(object [] args)3180行+ 0xa字节C# log4net.dll!log4net.Appender.FileAppender.OpenFile(string fileName,bool append)+ 0x162 bytes
log4net.dll!log4net.Appender.RollingFileAppender.OpenFile(string fileName,bool append)+ 0x189 bytes
log4net.dll!log4net.Appender.FileAppender.SafeOpenFile(string fileName,bool append)+ 0x2d bytes
log4net.dll!log4net.Appender.FileAppender.PrepareWriter()+ 0x13 bytes
log4net.dll!log4net.Appender.TextWriterAppender.PreAppendCheck()+ 0x32 bytes
log4net.dll!log4net.Appender.AppenderSkeleton.DoAppend(log4net.Core.LoggingEvent loggingEvent)+ 0xe0 bytes log4net.dll!log4net.Util.AppenderAttachedImpl.AppendLoopOnAppenders(log4net.Core.LoggingEvent loggingEvent)+ 0xa0 bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.CallAppenders(log4net.Core.LoggingEvent loggingEvent)+ 0xa9 bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.ForcedLog(System.Type callerStackBoundaryDeclaringType,log4net.Core.Level level,object message,System.Exception exception)+ 0x4a bytes
log4net.dll!log4net.Repository.Hierarchy.Logger.Log(System.Type callerStackBoundaryDeclaringType,log4net.Core.Level level,object message,System.Exception exception)+ 0x5e bytes
log4net.dll!log4net.Core.LogImpl.Info(对象消息)+ 0x27字节
答案 0 :(得分:0)
我在堆栈溢出中多次看到了log4net的这种行为。当磁盘空间用尽时,fileappender似乎开始阻塞。我猜这是附加程序中的错误,因此在这种情况下将其记录为错误似乎很合适。