(I've heard this list is a good place to discuss mod_jk code; please
redirect me and accept my apologies if it is not.)
I think I've found a problem with mod_jk 1.2.25 and Apache 2.x,
whereby JkEnvVar directives are effectively evaluated too many times
when VirtualHosts are configured.
The problem is apparent on a RHEL4 server of mine running Apache
2.2.6, with 17 name-based virtual hosts configured for *:80. I have
13 JkEnvVars specified, all with default values, in the main server
configuration. There are no JK directives within the virtual host
containers. By adding some additional instrumentation to the code, I
can see that each AJP packet is constructed with ((1 + 17) * 13) =
234 envvar attributes -- the whole set of attributes is appended 18
times in succession. (Often this overflows the default maximum
packet size.)
The source of the trouble seems to be in native/apache-2.0/mod_jk.c,
in the jk_post_config function, specifically lines 2853-2879 of the
1.2.25 source. This code is evaluated many times for the same sconf
object, as each iteration through the enclosing for loop has a
different server object, but ap_get_module_config returns the same
jk_server_conf_t* for all of them.
I would submit a patch for this but I'm no expert in coding Apache
modules, and I don't want to speculate about the way these
configurations should be constructed. If I should dig deeper and
develop a fix, or provide more information, let me know.
Thanks,
--
Ian Ward Comfort <[EMAIL PROTECTED]>
System Administrator, Student Computing, Stanford University
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