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From George Uecker <george.uec...@dot21rts.com>
Subject Re: AsyncAppender not working
Date Wed, 27 Jun 2007 20:19:08 GMT

After looking a little deeper, I now recall that we did indeed have a similar problem when
we first started using log4cxx.  To get our configuration to work, I had to modify DOMConfigurator
according to this post:


You'll want to first verify whether these mods are already in the version you're using...



George Uecker wrote:
> Hi Moshe,
> Moshe Matitya wrote:
>> Hi, George.
>> Thank you for responding.  I appreciate your taking the time.
>> I tried your config file, after commenting out the references to the
>> DDSAppender (so that it configures just one AsyncAppender, to which the
>> ConsoleAppender is attached).  Unfortunately, it did not work:  It, too,
>> produced the same error message ("No appender named [CONSOLE] could be
>> found"), and nothing was logged to the console.
>> The following was the debug output:
>>     log4cxx: The "configDebug" attribute is deprecated.
>>     log4cxx: Use the "internalDebug" attribute instead.
>>     log4cxx: Threshold ="".
>>     log4cxx: Level value for root is [debug].
>>     log4cxx: OptionConverter::toLevel: no class name specified,
>> level=[debug]
>>     log4cxx: root level set to DEBUG
>>     log4cxx: Class name: [org.apache.log4cxx.AsyncAppender]
>>     log4cxx: Attaching appender named [CONSOLE] to appender named
>>     log4cxx: No appender named [CONSOLE] could be found.
>>     log4cxx: Adding appender named [ASYNC_CONSOLE] to logger [root].
>> A couple of questions:
>> (1) Are you by any chance using the old, deprecated version of log4cxx
>> (0.9.7)?  I only began experiencing this problem with the AsyncAppender
>> when I upgraded to the latest version (0.10.0).
> No, I'm using a snapshot of HEAD from Oct. 2006.
>> (2) According to the following bug description, the AsyncAppender, when
>> under load, will cause logging threads to deadlock and hang:
>>     [#LOGCXX-129] Asyncappender is full of race conditions (improper use
>> of condition variables) - ASF JIRA
>>     http://issues.apache.org/jira/browse/LOGCXX-129
>> Hve you experienced this problem?  (Of course, if you are using log4cxx
>> 0.9.7, then you shouldn't have this problem either.)
> I have not experienced this problem, but I also modified AsyncAppender 
> slightly so that it does not block when its queue gets full.  Instead it 
> just drops any log msgs it can't handle.  Log4j's AsyncAppender now has 
> a configuration switch for blocking or non-blocking behavior, including 
> a summary of dropped msgs for non-blocking mode, but this functionality 
> has not been ported to log4cxx yet (that I know of).
> Thanks for bringing this bug report to my attention though...
> George

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