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From "Sachin Abaso Patil (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4NET-552) Incorrect behavior of RollingFileAppender while rolling files, if multiple processes appending into same file
Date Tue, 07 Feb 2017 12:24:41 GMT
Sachin Abaso Patil created LOG4NET-552:
------------------------------------------

             Summary: 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


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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