Guillaume Turri created LOG4J2-1052:
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Summary: syslog appender hangs if it looses connection for too long
Key: LOG4J2-1052
URL: https://issues.apache.org/jira/browse/LOG4J2-1052
Project: Log4j 2
Issue Type: Bug
Components: Appenders
Affects Versions: 2.3
Environment:
> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
> java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.5) (7u79-2.5.5-0ubuntu0.14.04.2)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
Reporter: Guillaume Turri
Priority: Minor
* Steps to reproduce:
** Launch the following program
** Ensure the syslog receives the messages
** Stop the wifi of the laptop running the program, and unplug its ethernet
cable (do it on the laptop running the program; *not* on the box running the
syslog)
The code is
{code}
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger
public class App
{
private static final Logger _logger =
LogManager.getLogger("TestLogger");
public static void main( String[] args ) throws Exception
{
int id = 0;
while ( true ){
String msg = "message: " + id;
_logger.error(msg);
id++;
Thread.sleep(10);
}
}
}
{code}
The config is:
{code}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} -
%msg%n"/>
</Console>
<Syslog name="my-syslog" host="my-host" port="12201" protocol="TCP"
format="RFC5424" mdcId="mdc" includeMDC="true" appName="testGTApp"
newLine="true" connectTimeoutMillis="100" immediateFail="true"
reconnectionDelayMillis="3000" immediateFlush="true" />
</Appenders>
<Loggers>
<Root level="info">
<AppenderRef ref="Console" />
<AppenderRef ref="my-syslog"/>
</Root>
</Loggers>
</Configuration>
{code}
* Expected behavior: even though the messages doesn't reach the syslog anymore,
the program continues to run forever
* Actual behavior: after about 350 messages, the program hangs. A thread dumps
shows
{code}
"main" prio=10 tid=0x00007fa21800a000 nid=0x2303 runnable [0x00007fa2209b6000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
at java.net.SocketOutputStream.write(SocketOutputStream.java:159)
at
org.apache.logging.log4j.core.net.TcpSocketManager.write(TcpSocketManager.java:129)
- locked <0x00000007d96ce668> (a
org.apache.logging.log4j.core.net.TcpSocketManager)
at
org.apache.logging.log4j.core.appender.OutputStreamManager.write(OutputStreamManager.java:135)
at
org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:110)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:99)
at
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:430)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:409)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:367)
at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:112)
at
org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:727)
at
org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:716)
at
org.apache.logging.log4j.spi.AbstractLogger.error(AbstractLogger.java:344)
at fr.test.App.main(App.java:17)
{code}
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