Hi,

We run a webapplication on 2 Tomcat 5.5 instance (with file session-sharing)
in cluster.

We use log4j for logging, it logs through a JDBC-Appender to mysql.

We have copied the log4j.jar under WEB-INF/lib directory of webapp. (No
under Tomcats)

Both Tomcat uses the same properties file to initialization (with Init
servlet)

We use MDC.put("id","myid") ...etc. - context of log4j for passing extra
parameters:

log4j.appender.mylog_db.layout.ConversionPattern=INSERT INTO MYLOG(ID, USER,
LEVEL, MESSAGE, DURA, DATUM) VALUES('%X{id}', '%X{user}', '%-5p', '%m',
'%X{dura}', NOW())

At bigger loading: level of MDC the logfiles mingle each other, so same
message become another user's parameter. (Probably the one Tomcat overwrites
the MDC of the another Tomcat, but it is Thread-safe)

What can we do the problem eliminate?

Thanx,
Chris




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