https://issues.apache.org/bugzilla/show_bug.cgi?id=56703
--- Comment #2 from Martin Knoblauch <kn...@knobisoft.de> ---
After some guessing and playing around, I think I have isolated my "failure
case".
Necessary condition is than "connection_pool_timeout" is enabled in mod_jk:
worker.template.connect_timeout=15000
and that the backend Tomcats(s) are using a "connectionTimeout" on the AJP
connector:
<Connector port="9397" protocol="AJP/1.3"
connectionTimeout="30000"
maxThreads="300"
minSpareThreads="10"
redirectPort="8443" />
Given the "right" timing, one can find the following in "mod_jk.log":
###########
[Wed Aug 13 14:21:05.827 2014] [22249:139749745399552] [info]
ajp_send_request::jk_ajp_common.c (1608): (lpsdm75-2) failed sending request,
socket 27 is not connected any more (errno=0, connected=2)
[Wed Aug 13 14:21:05.827 2014] [22249:139749745399552] [info]
ajp_send_request::jk_ajp_common.c (1681): (lpsdm75-2) all endpoints are
disconnected, detected by connect check (1), cping (0), send (0)
###########
I assume, that in this case the backend has closed the connection due to the
connctionTimeout and mod_jk still has to find out about it.
The code around line 1608 does this:
##########
if (jk_is_socket_connected(ae->sd, l) == JK_FALSE) {
ae->last_errno = errno;
jk_log(l, JK_LOG_INFO,
"(%s) failed sending request, "
"socket %d is not connected any more (errno=%d,
connected=%d)",
ae->worker->name, ae->sd, ae->last_errno,
ae->worker->s->connected);
ajp_abort_endpoint(ae, JK_FALSE, l);
err = JK_TRUE;
err_conn++;
}
##########
If "jk_is_socket_connected" decides that the socket is no longer connected, it
closes the socket, but can of course not decrement the "connected" counter. As
a result, the statistics are never decaying for the workers.
Adding "ae->worker->s->connected--" below "ajp_abort_endpoint" fixes the issue
for me.
A patch is included. In addition to the "fix", it also enables the logging in
line 1608 and some other logging in the maintenance loop.
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