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From "Dominik Psenner (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LOG4NET-552) Incorrect behavior of RollingFileAppender while rolling files, if multiple processes appending into same file
Date Wed, 15 Mar 2017 07:32:41 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925675#comment-15925675
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Dominik Psenner edited comment on LOG4NET-552 at 3/15/17 7:32 AM:
------------------------------------------------------------------

Rolling by date with multiple processes logging and rolling the same files is never going
to work without implementing a communication channel in between the processes to share the
rolling state information. I advise you to rethink your logging configuration.


was (Author: nachbarslumpi):
Rolling by date with multiple processes logging and rolling the same files is never going
tobwork without implementing a communication channel in between the processes to share the
rolling state information. I advise you to rethink your logging configuration.

> 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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