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https://issues.apache.org/jira/browse/LOG4NET-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16132024#comment-16132024
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ASF GitHub Bot commented on LOG4NET-552:
----------------------------------------
Github user dpsenner commented on a diff in the pull request:
https://github.com/apache/logging-log4net/pull/15#discussion_r133924926
--- Diff: src/Appender/FileAppender.cs ---
@@ -620,22 +620,23 @@ public class MinimalLock : LockingModelBase
private string m_filename;
private bool m_append;
private Stream m_stream = null;
-
- /// <summary>
- /// Prepares to open the file when the first message is
logged.
- /// </summary>
- /// <param name="filename">The filename to use</param>
- /// <param name="append">Whether to append to the file,
or overwrite</param>
- /// <param name="encoding">The encoding to use</param>
- /// <remarks>
- /// <para>
- /// Open the file specified and prepare for logging.
- /// No writes will be made until <see
cref="AcquireLock"/> is called.
- /// Must be called before any calls to <see
cref="AcquireLock"/>,
- /// <see cref="ReleaseLock"/> and <see
cref="CloseFile"/>.
- /// </para>
- /// </remarks>
- public override void OpenFile(string filename, bool
append, Encoding encoding)
+ private Mutex m_appendMutex = null;
+ private string m_appendMutexFriendlyName =
"MUTEX_INTERPROCESS_COMMUNICATION_ACROSS_PROCESSES";
+ /// <summary>
+ /// Prepares to open the file when the first message is logged.
+ /// </summary>
+ /// <param name="filename">The filename to use</param>
+ /// <param name="append">Whether to append to the file, or
overwrite</param>
+ /// <param name="encoding">The encoding to use</param>
+ /// <remarks>
+ /// <para>
+ /// Open the file specified and prepare for logging.
+ /// No writes will be made until <see cref="AcquireLock"/> is
called.
+ /// Must be called before any calls to <see
cref="AcquireLock"/>,
+ /// <see cref="ReleaseLock"/> and <see cref="CloseFile"/>.
+ /// </para>
--- End diff --
Update the docstring to document the new behavior.
> Incorrect behavior of RollingFileAppender while rolling files, if multiple
> processes appending into same file
> -------------------------------------------------------------------------------------------------------------
>
> Key: LOG4NET-552
> URL: https://issues.apache.org/jira/browse/LOG4NET-552
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.15
> Environment: Windows Server 2008 R2 Enterprise
> Reporter: Sachin Abaso Patil
> Priority: Blocker
> Attachments: Modification in AdjustFileBeforeAppend.png
>
>
> Hi Team,
> This issue has become blocker for us, as on our production environment,
> multiple processes are appending log into single log file which has no issue,
> but while rolling it overwrites files and thus missing log entries.
> Based on link below, it looks like log file rolling mechanism of log4net is
> not process safe even after using FileAppender.InterProcessLock.
> Link: https://issues.apache.org/jira/browse/LOG4NET-485
> Also, in FAQ (https://logging.apache.org/log4net/release/faq.html) under
> section “How do I get multiple process to log to the same file?”, it has been
> clearly mentioned that, rolling files is simply not compatible with multiple
> process scenario.
> My questions,
> 1. We are using version “1.2.15”. Are you planning to fix above mentioned
> rolling issue in upcoming release? If yes then please provide tentative
> release date.
> 2. We had incorporated log4net in our project in year 2009, had FAQ
> mentioned this limitation (rolling file not compatible with multi process) in
> year 2009? Because we while studying log4net during year 2009 we do not
> remember seeing this note in FAQ?
> Requesting you to please respond as soon as possible with your comments.
> Below is how we have configured appender for all processes,
> <appender name="RollingFileAppender"
> type="log4net.Appender.RollingFileAppender">
> <threshold value ="ERROR"/>
> <file value="${SystemDrive}\LogFiles\Example.log" />
> <param name="LockingModel"
> type="log4net.Appender.FileAppender+MinimalLock" />
> <appendToFile value="true" />
> <maximumFileSize value="100MB" />
> <staticLogFileName value="true"/>
> <maxSizeRollBackups value="-1" />
> <countDirection value="1" />
> <datePattern value=".yyyyMMddHH'.log'"/>
> <rollingStyle value="Composite" />
> <ignoreExceptionItemAgeLimit value="false" />
> <exceptionItemAgeLimit value="00:00:59" />
> <layout type="log4net.Layout.PatternLayout">
> <param name="conversionPattern" value ="%utcdate{yyyy-MM-dd
> HH:mm:ss.fff}|%-5level|%property{EventID}|%property{log4net:HostName}|%appdomain|%property{ProcessID}|%thread|%message%newline"/>
> </layout>
> </appender>
> Thanks,
> Sachin Patil
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