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https://issues.apache.org/jira/browse/LOG4J2-1012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14538104#comment-14538104
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Remko Popma commented on LOG4J2-1012:
-------------------------------------
Concretely, what change are you suggesting we make to AsyncAppender?
If the AsyncAppender thread is stuck trying to call the underlying appender
there is not much more we can do, can we?
Also, What do you mean with timeout on shutdown?
> 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
>
> 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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