From: Tatsuo Ishii <ishii at sraoss.co.jp>
Date: Wed, 14 Jul 2010 07:37:39 +0000 (+0000)
Subject: Check health DB nodes before doing delay checking.
X-Git-Tag: V3_0_0_BETA1~125
X-Git-Url: http://git.postgresql.org/gitweb/static/gitweb.js?a=commitdiff_plain;h=63546e97a7b379bbefe3e238288f4098152f16a7;p=pgpool2.git

Check health DB nodes before doing delay checking.
---

diff --git a/pool_worker_child.c b/pool_worker_child.c
index cb9692479..c3e72aabf 100644
--- a/pool_worker_child.c
+++ b/pool_worker_child.c
@@ -161,6 +161,7 @@ static void establish_persistent_connection(void)
 static void check_replication_time_lag(void)
 {
 	int i;
+	int active_nodes = 0;
 	POOL_STATUS sts;
 	POOL_SELECT_RESULT *res;
 	unsigned long long int lsn[MAX_NUM_BACKENDS];
@@ -174,6 +175,20 @@ static void check_replication_time_lag(void)
 		return;
 	}
 
+	/* Count healthy nodes */
+	for (i=0;i<NUM_BACKENDS;i++)
+	{
+		if (VALID_BACKEND(i))
+			active_nodes++;
+	}
+
+	if (active_nodes <= 1)
+	{
+		/* If there's only one or less active node, there's no point
+		 * to do checking */
+		return;
+	}
+
 	for (i=0;i<NUM_BACKENDS;i++)
 	{
 		if (!VALID_BACKEND(i))