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/*
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;
}
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