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https://issues.apache.org/jira/browse/LOG4J2-1012?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikael Ståldal resolved LOG4J2-1012.
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Resolution: Fixed
Fix Version/s: 2.4.1
OK, merged to master.
> AsyncAppender hang on shutdown if delegate Appender hangs
> ---------------------------------------------------------
>
> Key: LOG4J2-1012
> URL: https://issues.apache.org/jira/browse/LOG4J2-1012
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.2
> Reporter: Mikael Ståldal
> Fix For: 2.4.1
>
>
> I have a custom appender which sometimes hangs forever on
> Appender.append(LogEvent). To make sure that this does not affect my
> application, I have wrapped it with a non-blocking AsyncAppender like this.
> (I rather lose some log events than lock-up my application).
> {code:xml}
> <Configuration status="WARN">
> <Appenders>
> <Custom name="Custom">
> </Custom>
> <Async name="AsyncCustom" blocking="false">
> <AppenderRef ref="Custom"/>
> </Async>
> </Appenders>
> <Loggers>
> <Root level="INFO">
> <AppenderRef ref="AsyncCustom"/>
> </Root>
> </Loggers>
> </Configuration>
> {code}
> This works fine as long as the application runs, but when I shut down, it can
> hang forever, from jstack:
> {code}
> "pool-1-thread-1" prio=10 tid=0x00007f3e840cd800 nid=0x3945 in Object.wait()
> [0x00007f3e765de000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> - waiting on <0x00000007490d2b88> (a
> org.apache.logging.log4j.core.appender.AsyncAppender$AsyncThread)
> at java.lang.Thread.join(Thread.java:1281)
> - locked <0x00000007490d2b88> (a
> org.apache.logging.log4j.core.appender.AsyncAppender$AsyncThread)
> at java.lang.Thread.join(Thread.java:1355)
> at
> org.apache.logging.log4j.core.appender.AsyncAppender.stop(AsyncAppender.java:119)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.stop(AbstractConfiguration.java:228)
> at
> org.apache.logging.log4j.core.LoggerContext.stop(LoggerContext.java:224)
> at
> org.apache.logging.log4j.core.LoggerContext$1.run(LoggerContext.java:185)
> at
> org.apache.logging.log4j.core.util.DefaultShutdownCallbackRegistry$1.run(DefaultShutdownCallbackRegistry.java:101)
> at
> org.apache.logging.log4j.core.util.DefaultShutdownCallbackRegistry.run(DefaultShutdownCallbackRegistry.java:75)
> at java.lang.Thread.run(Thread.java:745)
> Locked ownable synchronizers:
> - <0x00000007490e9360> (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
> "AsyncAppender-AsyncCustom" daemon prio=10 tid=0x00007f3e84676000 nid=0x386b
> waiting on condition [0x00007f3e77df6000]
> [...hang in CustomAppender...]
> org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:99)
> at
> org.apache.logging.log4j.core.appender.AsyncAppender$AsyncThread.callAppenders(AsyncAppender.java:290)
> at
> org.apache.logging.log4j.core.appender.AsyncAppender$AsyncThread.run(AsyncAppender.java:241)
> Locked ownable synchronizers:
> - None
> {code}
> It would be nice if AsyncAppender could fully protect you from faulty
> appenders and have some timeout on shutdown (at least when you specify
> blocking=false). Proper shutdown of the application is important for me.
> (I know that I should fix my faulty custom appender, but I want an extra
> safety net to make my application reliable and robust.)
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