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From "Sachin Abaso Patil (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4NET-552) Incorrect behavior of RollingFileAppender while rolling files, if multiple processes appending into same file
Date Wed, 15 Mar 2017 08:52:41 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925763#comment-15925763
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Sachin Abaso Patil commented on LOG4NET-552:
--------------------------------------------

Hi Dominik,

Thanks for your response.

In case of size based rolling, we would like to know purpose of deleting destination file
during rollover. Is this required to protect any use case if yes then please mention. And
please let us know if we modify RollFile method to not do any operation if destination file
exists, do you think it will have side-effects? If yes please let us know that too.

Thanks,
Sachin Patil

> 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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