Merge r1227637, r1227642 from trunk:

restore the generic proxy workers to not being address-reusable.

The guts of mod_proxy is not really ready for the addr and host on a
proxy_conn_rec to change over time and differ from the 1 cached in the worker.

* proxy_worker->cp->addr needs to know what host/port it cached
* conn->addr and conn->hostname need to be allocated from their own subpool
  so they can be cleared as they change
* ap_proxy_determine_connection needs to be more careful about which
  addr is the TCP endpoint and what we have in either cache.
* may need to avoid updating the proxy_worker addr cache if we know
  the value is flipping.

Update the comment and checks around address/connection reusability
in mod_proxy.

The checks and comment are a vestige of 2.0.x
mod_proxy_http where the backend proxy conn was stored in
the frontend r->conn_config, but ap_proxy_determine_connection()
doesn't associate the frontend and backend conns like this.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1227645 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/modules/proxy/mod_proxy.c b/modules/proxy/mod_proxy.c
index 24f552e0fb9b13b7240731fdea3a991c996c4ff7..751c88594b2498165b76ab218b433b8d55405416 100644 (file)
--- a/modules/proxy/mod_proxy.c
+++ b/modules/proxy/mod_proxy.c
@@ -2447,9 +2447,9 @@ static void child_init(apr_pool_t *p, server_rec *s)
                 ap_proxy_hashfunc(conf->forward->s->name, PROXY_HASHFUNC_FNV);
             /* Do not disable worker in case of errors */
             conf->forward->s->status |= PROXY_WORKER_IGNORE_ERRORS;
+            ap_proxy_initialize_worker(conf->forward, s, conf->pool);
             /* Disable address cache for generic forward worker */
             conf->forward->s->is_address_reusable = 0;
-            ap_proxy_initialize_worker(conf->forward, s, conf->pool);
         }
         if (!reverse) {
             ap_proxy_define_worker(p, &reverse, NULL, NULL, "http://www.apache.org", 0);
@@ -2462,11 +2462,11 @@ static void child_init(apr_pool_t *p, server_rec *s)
                 ap_proxy_hashfunc(reverse->s->name, PROXY_HASHFUNC_FNV);
             /* Do not disable worker in case of errors */
             reverse->s->status |= PROXY_WORKER_IGNORE_ERRORS;
+            conf->reverse = reverse;
+            ap_proxy_initialize_worker(conf->reverse, s, conf->pool);
             /* Disable address cache for generic reverse worker */
             reverse->s->is_address_reusable = 0;
         }
-        conf->reverse = reverse;
-        ap_proxy_initialize_worker(conf->reverse, s, conf->pool);
         s = s->next;
     }
 }

diff --git a/modules/proxy/proxy_util.c b/modules/proxy/proxy_util.c
index e40b569498c5104bf6ac81ccb2941a81e465c3c2..e975af94bc201fec2d36d16f3943019be04217a8 100644 (file)
--- a/modules/proxy/proxy_util.c
+++ b/modules/proxy/proxy_util.c
@@ -2020,19 +2020,17 @@ ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
                            uri->fragment ? uri->fragment : "", NULL);
     }
     /*
-     * Make sure that we pick the the correct and valid worker.
-     * If a single keepalive connection triggers different workers,
-     * then we have a problem (we don't select the correct one).
-     * Do an expensive check in this case, where we compare the
-     * the hostnames associated between the two.
+     * Figure out if our passed in proxy_conn_rec has a usable
+     * address cached.
      *
-     * TODO: Handle this much better...
+     * TODO: Handle this much better... 
+     *
+     * XXX: If generic workers are ever address-reusable, we need 
+     *      to check host and port on the conn and be careful about
+     *      spilling the cached addr from the worker.
      */
     if (!conn->hostname || !worker->s->is_address_reusable ||
-         worker->s->disablereuse ||
-         (r->connection->keepalives &&
-         (r->proxyreq == PROXYREQ_PROXY || r->proxyreq == PROXYREQ_REVERSE) &&
-         (strcasecmp(conn->hostname, uri->hostname) != 0) ) ) {
+        worker->s->disablereuse) {
         if (proxyname) {
             conn->hostname = apr_pstrdup(conn->pool, proxyname);
             conn->port = proxyport;