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Subject iPlanet / SunONE web server tomcat connector connection re-use disabled
Date Fri, 06 Jul 2007 08:45:56 GMT


I have been using the tomcat connector for Netscape / SunONE web server 
from the tomcat-connectors-1.2.23-src bundle available from the main 
tomcat site. I have found that connections are not being re-used by the 
connector. i.e. the connector opens a separate connection to tomcat for 
each and every request it's configured to pass to tomcat and then closes 
that connection after receiving it's response.

When I enable debug logging for the connector I see messages telling me 
that connection re-use is disabled. I found reference to an option for 
apache to disable re-use but nothing for Netscape. Looking at the source 
code I find that all but the Netscape connector appear to have a 
"s->disable_reuse = JK_FALSE;" statement in the "init_ws_service" function 
in the connector source code file (jk_nsapi_plugin.c for Netscape). 

As a test I have added this to the Netscape connector and re-compiled and 
it now re-uses connections which is an obvious performance gain (I'm 
assuming here as I haven't benchmarked anything). The implication is that 
someone either explicitly set re-use to be disabled for Netscape, 
presumably due to problems not immediately obvious if re-use is enabled,, 
or someone changed the common code to make re-use optional but forgot to 
enable it by default in the Netscape connector. I only suggest the latter 
as there is no immediately obvious indication that it is intentionally 
disable in Netscape and the plug-in seems to work with it enabled after 
some very brief testing.


Can anyone confirm or deny whether the Netscape connector should not have 
connection re-use enabled as the other connectors do. Some overview of any 
reason would also be much appreciated.

Many Thanks in advance.

Dale Roberts
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