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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1094) Multi thread initialization problem
Date Wed, 27 Apr 2016 12:26:13 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15260040#comment-15260040
] 

Ralph Goers commented on LOG4J2-1094:
-------------------------------------

You could say the same thing about a reconfiguration. The only real difference is that the
default configuration is probably more different then the changes made during reconfiguration.

I'm very much against having anything block the application, even if it is just a couple of
seconds.

> Multi thread initialization problem
> -----------------------------------
>
>                 Key: LOG4J2-1094
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1094
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.3
>            Reporter: Luca Burgazzoli
>            Assignee: Ralph Goers
>
> I wrote a very simple example which has a behaviour I do not expect:
> If I call LogManager.getLogger(..) from two threads, only one of the loggers logs what
I'd expect but if I add an additional call to LogManager.getLogger(..) before the threads
are started, I see what I'd expect so it looks like there is a problem in multi threaded initialization.
> You can find the code and the configuration here:
> - https://github.com/lburgazzoli/lb-chronicle/blob/master/chronicle-examples/chronicle-logger-log4j2/src/main/java/com.github.lburgazzoli.openhft.examples.chronicle.logger.log4j2/MtLogging.java
> - https://github.com/lburgazzoli/lb-chronicle/blob/master/chronicle-examples/chronicle-logger-log4j2/src/main/resources/log4j2.xml
> {code}
> public class MtLogging {
>     public static void main(final String[] args) throws Exception {
>         //LogManager.getLogger("main");
>         Thread th1 = new Thread(() -> {
>             final String name = "thread-1";
>             final Logger log = LogManager.getLogger(name);
>             System.out.println("write " + name);
>             log.info("message");
>             System.out.println("done " + name);
>         });
>         Thread th2 = new Thread(() -> {
>             final String name = "thread-2";
>             final Logger log = LogManager.getLogger(name);
>             System.out.println("write " + name);
>             log.info("message");
>             System.out.println("done " + name);
>         });
>         th1.start();
>         th2.start();
>         th1.join();
>         th2.join();
>     }
> }
> {code}
> {code}
> <?xml version="1.0" encoding="UTF-8"?>
> <configuration>
>     <appenders>
>         <Console name="STDOUT" target="SYSTEM_OUT">
>             <PatternLayout pattern="[TEST] [%-5p] %c - %m%n%throwable{none}"/>
>         </Console>
>     </appenders>
>     <loggers>
>         <root level="all">
>             <appender-ref ref="STDOUT"/>
>         </root>
>     </loggers>
> </configuration>
> {code}
> The code above will show:
> {noformat}
>     write thread-1
>     done thread-1 
>     write thread-2
>     [TEST] [INFO ] thread-2 - message
>     done thread-2
> {noformat}
> Any call to LogManager makes it succeed (the problem no longer occurs):
> {code}
>     LogManager.getContext(false);
>     th1.start();
>     th2.start();
>     th1.join();
>     th2.join();
> {code}
> New output:
> {noformat}
>     write thread-2
>     write thread-1
>     [TEST] [INFO ] thread-2 - message
>    done thread-2
>    [TEST] [INFO ] thread-1 - message
>    done thread-1
> {noformat}
> The funny thing is that the first thread to arrive is initialized with ERROR level instead
of the ALL that is given to root. In other words it seems that the config has not loaded



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