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From Yefym Dmukh <>
Subject Tomcat 5.0.5 threads + log4j Mapped Diagnostic Contexts. Simultaneous clients access problem.
Date Mon, 23 Jan 2006 16:07:21 GMT
Hi folks,
here is a description of the current situation we have releasing the 
logging component.

Using the log4j mapped diagnostic context dump the application specific 
information into the log files. 

The log4j documentation has a primary statement that is accordingly the 
basis for the MDC/NDC approach: "In a typical multithreaded implementation 
of such a system, different threads will handle different clients." 

As the test environment apache 2.0.49 and tomcat 5.0.25 under "windows 
2000 professional" were used. 
The tests showed that two clients not necessarily become the different 
threads. Quite often the thread, taken by the client A is shared later 
with the client B and afterwards is used again by the client A. 

I`m wondering how it is at all possible, does it mean that tomcat has 
somewhere the pool of the actual HttpSessions and they are not associated 
with the corresponding threads or even worth it makes the session 
serialization and gives another client the control over the thread? 

Due to my tomcat configuration I do not see any restrictions on the thread 
pool, in many times the client even opens the several threads and this is 
understandable. The non-understandable is the thread sharing between 
several clients and valid HttpSessions.

I believe it is pure tomcat issue, that’s why stated the question here. 
The ideas and suggestions are highly appreciated, 

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