1 files changed, 107 insertions, 0 deletions
diff --git a/ctdb/server/ctdb_keepalive.c b/ctdb/server/ctdb_keepalive.c
new file mode 100644
index 0000000000..5c95eb0c9b
--- /dev/null
+++ b/ctdb/server/ctdb_keepalive.c
@@ -0,0 +1,107 @@
+/* 
+   monitoring links to all other nodes to detect dead nodes
+
+
+   Copyright (C) Ronnie Sahlberg 2007
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "system/wait.h"
+#include "../include/ctdb_private.h"
+
+
+/*
+  see if any nodes are dead
+ */
+static void ctdb_check_for_dead_nodes(struct event_context *ev, struct timed_event *te, 
+				      struct timeval t, void *private_data)
+{
+	struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
+	int i;
+
+	/* send a keepalive to all other nodes, unless */
+	for (i=0;i<ctdb->num_nodes;i++) {
+		struct ctdb_node *node = ctdb->nodes[i];
+
+		if (node->flags & NODE_FLAGS_DELETED) {
+			continue;
+		}
+
+		if (node->pnn == ctdb->pnn) {
+			continue;
+		}
+		
+		if (node->flags & NODE_FLAGS_DISCONNECTED) {
+			/* it might have come alive again */
+			if (node->rx_cnt != 0) {
+				ctdb_node_connected(node);
+			}
+			continue;
+		}
+
+
+		if (node->rx_cnt == 0) {
+			node->dead_count++;
+		} else {
+			node->dead_count = 0;
+		}
+
+		node->rx_cnt = 0;
+
+		if (node->dead_count >= ctdb->tunable.keepalive_limit) {
+			DEBUG(DEBUG_NOTICE,("dead count reached for node %u\n", node->pnn));
+			ctdb_node_dead(node);
+			ctdb_send_keepalive(ctdb, node->pnn);
+			/* maybe tell the transport layer to kill the
+			   sockets as well?
+			*/
+			continue;
+		}
+		
+		DEBUG(DEBUG_DEBUG,("sending keepalive to %u\n", node->pnn));
+		ctdb_send_keepalive(ctdb, node->pnn);
+
+		node->tx_cnt = 0;
+	}
+	
+	event_add_timed(ctdb->ev, ctdb->keepalive_ctx,
+			timeval_current_ofs(ctdb->tunable.keepalive_interval, 0), 
+			ctdb_check_for_dead_nodes, ctdb);
+}
+
+
+void ctdb_start_keepalive(struct ctdb_context *ctdb)
+{
+	struct timed_event *te;
+
+	ctdb->keepalive_ctx = talloc_new(ctdb);
+	CTDB_NO_MEMORY_FATAL(ctdb, ctdb->keepalive_ctx);
+
+	te = event_add_timed(ctdb->ev, ctdb->keepalive_ctx,
+			     timeval_current_ofs(ctdb->tunable.keepalive_interval, 0), 
+			     ctdb_check_for_dead_nodes, ctdb);
+	CTDB_NO_MEMORY_FATAL(ctdb, te);
+
+	DEBUG(DEBUG_NOTICE,("Keepalive monitoring has been started\n"));
+}
+
+void ctdb_stop_keepalive(struct ctdb_context *ctdb)
+{
+	talloc_free(ctdb->keepalive_ctx);
+	ctdb->keepalive_ctx = NULL;
+}
+