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From "Chuck Felish (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LOG4NET-454) Intermittent severe slowdown with RollingFileAppender+MinimalLock
Date Fri, 27 Feb 2015 23:17:04 GMT

     [ https://issues.apache.org/jira/browse/LOG4NET-454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chuck Felish updated LOG4NET-454:
---------------------------------
    Summary: Intermittent severe slowdown with RollingFileAppender+MinimalLock  (was: Intermittent
severe slowdown)

> Intermittent severe slowdown with RollingFileAppender+MinimalLock
> -----------------------------------------------------------------
>
>                 Key: LOG4NET-454
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-454
>             Project: Log4net
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 1.2.13
>         Environment: ASP.NET MVC 5.2.2 Application, Windows 7 Professional
>            Reporter: Chuck Felish
>
> Using RollingFileAppender with MinimalLock we found an extreme slowdown in the processing
of our application requests (from 300ms to up to 15s in some cases) which was resolved when
we deleted our log files. We also found that changing the lock to Exclusive resolved the issue.
> Interestingly file content seemed to be related, but not file size. When I took the contents
of a colleague's log file and pasted them into my own log file the slowness issue appeared
again. I then tried deleting about half the contents and then causing the file to grow to
larger than the original size but the issue did not return. Pasting the original contents
back into the file caused the performance issue to return.
> While Exclusive lock has resolved our issue for now, it's quite unexpected that file
contents would affect performance at all, and that the issue is does not consistently reproduce
even though configuration is unchanged.
> I'm happy to demonstrate and/or share our problematic log files with you to facilitate
the resolution of this issue.
> Our configuration is as follows:
>     <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
>         <file type="log4net.Util.PatternString" value="Logs\%property{ExecutableName}_%env{COMPUTERNAME}.log"
/>
>         <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
>         <appendToFile value="true" />
>         <rollingStyle value="Size" />
>         <maximumFileSize value="5MB" />
>         <maxSizeRollBackups value="50" />
>         <preserveLogFileNameExtension value="true" />
>         <layout type="log4net.Layout.PatternLayout">
>             <conversionPattern value="%d{yyyy-MM-dd HH:mm:ss.fff} [%-5level][%5thread]
%logger - %m%n" />
>         </layout>
>     </appender>
>     <root>
>         <!-- NOTE:  This is overriden programatically by Log4NetConfig.cs -->
>         <level value="ALL" />
> <!--        <appender-ref ref="ColorConsole" />-->
>         <appender-ref ref="RollingFile" />
>     </root>



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