[jira] Created: (LOG4NET-231) App hangs on log attempt when non-contiguous rolling log files exist

App hangs on log attempt when non-contiguous rolling log files exist
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                 Key: LOG4NET-231
                 URL: https://issues.apache.org/jira/browse/LOG4NET-231
             Project: Log4net
          Issue Type: Bug
          Components: Appenders
    Affects Versions: 1.2.10
         Environment: Win32, Win Server 2003, C# app
            Reporter: John Fairhall
             Fix For: 1.2.11



Application has this log4net config:

<log4net>
    <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
        <file value="..\log\OOPCollector.log" />
        <appendToFile value="false" />
        <maximumFileSize value="5MB" />
        <maxSizeRollBackups value="5" />
                <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%date %5level [%thread] %logger - %message%newline" />
        </layout>
    </appender>
    <root>
        <level value="INFO" />
        <appender-ref ref="RollingFile" />
    </root>
</log4net>


We are attemping to keep current + 5 backup logs.

Somehow, the resulting logs for the OOPCollector app became;
OOPCollector.log
OOPCollector.log.5

Starting the app with only those logs already existing causes the app to stop on a log attempt permanently.
The OOPCollector.log.5 log dissappears but the OOPCollector.log does not get renamed to OOPCollector.log.1, and no new OOPCollector.log is created.

The issue also occurs if the directory contains
OOPCollector.log
OOPCollector.log.4
except that .4 does get renamed to .5, but otherwise same problem.

Directory containining
OOPCollector.log
OOPCollector.log.3
works as expected.

Have set config to store 10 backups, and have same issue with OOPCollector.log and OOPCollector.log.10, and OOPCollector.log and OOPCollector.log.9.
So looks like a fencepost error with rollover.

We are also getting OOPCollector.<timestamp>.1, .2, .3 files in the directory occaisionally for no apparent reason.








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John Fairhall commented on LOG4NET-231:
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Have tracked the issue. We have one java application running as a service that starts up our c# application. The missing backup logs were generating output on stderr, which the java app was not configured to read. As nothing was reading it's stderr, the c# app blocked.

I'd say this issue is resolved, with a further comment that it should have been straightforward to stifle the stderr output from the logger, but isn't.

> App hangs on log attempt when non-contiguous rolling log files exist
> --------------------------------------------------------------------
>
>                 Key: LOG4NET-231
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-231
>             Project: Log4net
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 1.2.10
>         Environment: Win32, Win Server 2003, C# app
>            Reporter: John Fairhall
>             Fix For: 1.2.11
>
>
> Application has this log4net config:
> <log4net>
>     <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
>         <file value="..\log\OOPCollector.log" />
>         <appendToFile value="false" />
>         <maximumFileSize value="5MB" />
>         <maxSizeRollBackups value="5" />
> <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
>         <layout type="log4net.Layout.PatternLayout">
>             <conversionPattern value="%date %5level [%thread] %logger - %message%newline" />
>         </layout>
>     </appender>
>     <root>
>         <level value="INFO" />
>         <appender-ref ref="RollingFile" />
>     </root>
> </log4net>
> We are attemping to keep current + 5 backup logs.
> Somehow, the resulting logs for the OOPCollector app became;
> OOPCollector.log
> OOPCollector.log.5
> Starting the app with only those logs already existing causes the app to stop on a log attempt permanently.
> The OOPCollector.log.5 log dissappears but the OOPCollector.log does not get renamed to OOPCollector.log.1, and no new OOPCollector.log is created.
> The issue also occurs if the directory contains
> OOPCollector.log
> OOPCollector.log.4
> except that .4 does get renamed to .5, but otherwise same problem.
> Directory containining
> OOPCollector.log
> OOPCollector.log.3
> works as expected.
> Have set config to store 10 backups, and have same issue with OOPCollector.log and OOPCollector.log.10, and OOPCollector.log and OOPCollector.log.9.
> So looks like a fencepost error with rollover.
> We are also getting OOPCollector.<timestamp>.1, .2, .3 files in the directory occaisionally for no apparent reason.

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