5:07 p.m.
Simone Gotti created MODCLUSTER-309:
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Summary: mod_proxy_cluster not checking all available balancers (but only the
first one) for an available route
Key: MODCLUSTER-309
URL: https://issues.jboss.org/browse/MODCLUSTER-309
Project: mod_cluster
Issue Type: Bug
Affects Versions: 1.2.1.Final
Environment: RedHat EL 6.2, httpd-2.2.15-15.el6
Reporter: Simone Gotti
Assignee: Jean-Frederic Clere
I have an environment with two or more balancers.
I want all the balancers to be available for all the virtualhosts (and maybe filter them
using UseAlias). So I'm not configuring any ProxyPass directive but let mod_cluster
create the balancers.
During a simple test I noticed that session stickiness was not working for some requests.
Enabling debug I noticed that mod_proxy_cluster:get_route_balancer failed to find a route
so the worker was recalculated:
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(2617): proxy_cluster_trans for 0
(null) (null) uri: /context01/jsp01.jsp args: (null) unparsed_uri: /context01/jsp01.jsp
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(2441): cluster:
balancer://balancer01 Found value
7tTdLpqWIZjDLcyBrn25tCc9.eb5376bd-c45b-38d1-97e0-c16b97f471d1 for stickysession
JSESSIONID|jsessionid
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(2441): cluster:
balancer://balancer01 Found value
7tTdLpqWIZjDLcyBrn25tCc9.eb5376bd-c45b-38d1-97e0-c16b97f471d1 for stickysession
JSESSIONID|jsessionid
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(2675): proxy_cluster_trans using
balancer02 uri: proxy:balancer://balancer02/context01/jsp01.jsp
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(2708): proxy_cluster_canon url:
//balancer02/context01/jsp01.jsp
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(3140): proxy_cluster_pre_request:
url balancer://balancer02/context01/jsp01.jsp
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(2880): cluster:No route found
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(1854): proxy: Entering byrequests
for CLUSTER (balancer://balancer02)
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(1972): proxy: byrequests balancer
DONE (ajp://192.168.122.22:8359)
[Tue May 15 16:39:46 2012] [debug] mod_proxy_cluster.c(3368): proxy_cluster_pre_request:
balancer (balancer://balancer02) worker (ajp://192.168.122.22:8359) rewritten to
ajp://192.168.122.22:8359/context01/jsp01.jsp
Looking at the code looks like mod_cluster checks only the first balancer and, if it does
not find any valid route it will give up without retrying the other available balancers.
With this patch it's now checking all the available balancers:
Index: mod_proxy_cluster/mod_proxy_cluster.c
===================================================================
--- mod_proxy_cluster/mod_proxy_cluster.c (revision 838)
+++ mod_proxy_cluster/mod_proxy_cluster.c (working copy)
@@ -2453,7 +2453,7 @@
/* Nice we have a route, but make sure we have to serve it */
int *nodes = find_node_context_host(r, balancer, route, use_alias,
vhost_table, context_table);
if (nodes == NULL)
- return NULL; /* we can't serve context/host for the request */
+ continue; /* we can't serve context/host for the request with
this balancer*/
}
if (route && *route) {
char *domain = NULL;
and this is the log after this possible fix:
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2617): proxy_cluster_trans for 0
(null) (null) uri: /context01/ args: (null) unparsed_uri: /context01/
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2441): cluster:
balancer://balancer02 Found value
Frjih6gBZzDUg+RFgeUvKJfy.9cedb7e1-5c20-3da7-bd17-9d0bc99b49d3 for stickysession
JSESSIONID|jsessionid
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2441): cluster:
balancer://balancer01 Found value
Frjih6gBZzDUg+RFgeUvKJfy.9cedb7e1-5c20-3da7-bd17-9d0bc99b49d3 for stickysession
JSESSIONID|jsessionid
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2461): cluster: Found route
9cedb7e1-5c20-3da7-bd17-9d0bc99b49d3
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2377): find_nodedomain: finding
node for 9cedb7e1-5c20-3da7-bd17-9d0bc99b49d3: balancer01
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2470): cluster: Found balancer
balancer01 for 9cedb7e1-5c20-3da7-bd17-9d0bc99b49d3
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2675): proxy_cluster_trans using
balancer01 uri: proxy:balancer://balancer01/context01/
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2708): proxy_cluster_canon url:
//balancer01/context01/
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(3140): proxy_cluster_pre_request:
url balancer://balancer01/context01/
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(2876): cluster: Using route
9cedb7e1-5c20-3da7-bd17-9d0bc99b49d3
[Tue May 15 16:38:36 2012] [debug] mod_proxy_cluster.c(3368): proxy_cluster_pre_request:
balancer (balancer://balancer01) worker (ajp://192.168.122.22:8259) rewritten to
ajp://192.168.122.22:8259/context01/
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