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From Ralph Goers <ralph.go...@dslextreme.com>
Subject Re: Problems with FileoverAppender
Date Tue, 26 Mar 2013 17:32:24 GMT
I've been doing some work on the SocketAppender, which is the base for the SyslogAppender.
 The SocketAppender is not flushing the OutputStream on every send. From what I can tell this
is causing the data to be buffered and the exception only gets thrown when the buffer gets
full and actual I/O takes place.  To fix this I will need to add an "immediate flush" option
to force the I/O, but that is also probably going to negatively impact performance.


On Mar 26, 2013, at 9:35 AM, Daniele Menotti wrote:

> Hi all,
> I'm writing an application where I want to log to a Syslog server. I'm doing it using
a FailoverAppender, so when the Syslog server is down I can log to a local file. I'm using
Log4j 2.0beta4.
> Here is my log4j2.xml configuration file:
> <configuration>
>    <appenders>
>        <RollingFile name="RollingFile" fileName="logs/app.log" filePattern="logs/archive/app_%d{yyyy-MM-dd}.log"
immediateFlush="true" suppressExceptions="false">
>            <PatternLayout>
>                <pattern>%d %-5p - %m%n</pattern>
>            </PatternLayout>
>            <Policies>
>                <TimeBasedTriggeringPolicy />
>            </Policies>
>        </RollingFile>
>        <Syslog name="Syslog_local0" host="" port="514" protocol="TCP"
appName="LogTester" immediateFlush="true" facility="LOCAL0" newLine="true" reconnectionDelay="1"
>        <Failover name="Failover" primary="Syslog_local0" retryInterval="3" suppressExceptions="false">
>            <Failovers>
>                <appender-ref ref="RollingFile"/>
>            </Failovers>
>        </Failover>
>    </appenders>
>    <loggers>
>        <root level="debug">
>            <appender-ref ref="Failover"/>
>        </root>
>    </loggers>
> </configuration>
> Now, I tried some scenarios:
> Syslog server is up when my application starts and it remains up till the end: I can
log to Syslog without problems ;-)
> Syslog server is down when my application starts and it remains always down: I don't
log to Syslog, but I log to my local file, as expected ;-)
> Syslog server is up when my application starts, than it goes down - for example I log
message1 to Syslog, than I put the server down and I log message2 and message3: in this case
I can log message1 to Syslog and when my application tries to log message2 I get an Exception:
ERROR StatusLogger Unable to write to stream TCP: for appender Syslog_local0
> ERROR StatusLogger An exception occurred processing Appender Syslog_local0 org.apache.logging.log4j.core.appender.AppenderRuntimeException:
Error writing to TCP:
> at org.apache.logging.log4j.core.net.TCPSocketManager.write(TCPSocketManager.java:120)
> at org.apache.logging.log4j.core.appender.OutputStreamManager.write(OutputStreamManager.java:127)
> at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:115)
> at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:102)
> at org.apache.logging.log4j.core.appender.FailoverAppender.callAppender(FailoverAppender.java:122)
> at org.apache.logging.log4j.core.appender.FailoverAppender.append(FailoverAppender.java:109)
> at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:102)
> at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:335)
> at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:316)
> at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:281)
> at org.apache.logging.log4j.core.Logger.log(Logger.java:108)
> at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:657)
> at com.hp.prp.util.log.SyslogLogger.info(SyslogLogger.java:82)
> at com.hp.prp.util.log.Prova.main(Prova.java:25)
> Caused by: java.net.SocketException: Software caused connection abort: socket write error
> at java.net.SocketOutputStream.socketWrite0(Native Method)
> at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
> at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
> at org.apache.logging.log4j.core.net.TCPSocketManager.write(TCPSocketManager.java:111)
> ... 13 more
> message2 is lost and message3 is logged to the local file.... So why message2 becomes
lost?? How can I do to log it to the local file as I expect?
> 4. Syslog server is down when my application starts, than it goes up - for example I
log message1 to the local file, than I put the server up and I log message2 and message3 to
Syslog: in this case logging works fine because fileoverAppender tries the primary appender
every 3 seconds.
> How can I do to resolve my problems in scenario 3?
> Thanks in advance,
> Daniele

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