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https://issues.apache.org/jira/browse/LOG4J2-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616311#comment-14616311
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Guillaume Turri commented on LOG4J2-1052:
-----------------------------------------
I'm afraid I still experience the issue.
I did the same manipulations as before, with 'socketTimeoutMillis="1000" '
added in my config, and with your patch; and when I shutdown my wifi, the
application still hangs after a while.
According to the setSoTimeout documentation
(http://docs.oracle.com/javase/7/docs/api/java/net/Socket.html#setSoTimeout%28int%29),
it's suppose to add a timeout on the read, whereas here we have issues with a
write, so I guess it explains why I still experience this issue. On the other
hand, I'm afraid I don't see any other option that could help us here.
> 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
> Attachments: log4j2-1052.diff
>
>
> * 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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