Tada!

First step in activating backend polling:  Do not attempt to open
connections to a unhealthy backend.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3132 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_backend.c

@@ -313,6 +313,11 @@ VBE_GetVbe(struct sess *sp, struct backend *bp)
 		VBE_ClosedFd(sp);
 	}
 
+	if (!bp->healthy) {
+		VSL_stats->backend_unhealthy++;
+		return (NULL);
+	}
+
 	vc = VBE_NewConn();
 	assert(vc->fd == -1);
 	AZ(vc->backend);

include/stat_field.h

@@ -37,6 +37,7 @@ MAC_STAT(cache_hitpass,		uint64_t, 'a', "Cache hits for pass")
 MAC_STAT(cache_miss,		uint64_t, 'a', "Cache misses")
 
 MAC_STAT(backend_conn,		uint64_t, 'a', "Backend connections success")
+MAC_STAT(backend_unhealthy,	uint64_t, 'a', "Backend connections not attempted")
 MAC_STAT(backend_fail,		uint64_t, 'a', "Backend connections failures")
 MAC_STAT(backend_reuse,		uint64_t, 'a', "Backend connections reuses")
 MAC_STAT(backend_recycle,	uint64_t, 'a', "Backend connections recycles")