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From "Martin Frydl (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (LOG4J2-705) Async logger loses thread context stack for events
Date Mon, 14 Jul 2014 12:00:10 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Frydl closed LOG4J2-705.
-------------------------------


Tested on revision 1610388, works fine. Thanks.

> Async logger loses thread context stack for events
> --------------------------------------------------
>
>                 Key: LOG4J2-705
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-705
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0-rc2
>            Reporter: Martin Frydl
>            Assignee: Remko Popma
>             Fix For: 2.0
>
>         Attachments: async-context-test.zip
>
>
> I've enabled the async logger and created some log message with values in thread context
stack. However, the logged message does not contain any of these items.
> Looking at the sources, it seems that AsyncLogger.logMessage() needs to clone the stack
instead of using ThreadContext.getImmutableStack() (line 260). This is because getImmutableStack()
method returns the same stack as original - getting the real one from thread local storage.
So when passed to another thread (as async does), the same stack "looks" into different thread
and returns empty list. It is even possible to break this "immutable" stack when you create
your own appender and use ThreadContext.push() in append() method. This will affect the message
being logged.
> Simple solution is to replace getImmutableStack() method in AsyncLogger.logMessage()
(line 260) with ThreadContext.cloneStack(). But I'm not sure if this is the right way.



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