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98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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monitoring links to all other nodes to detect dead nodes
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Copyright (C) Ronnie Sahlberg 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "lib/events/events.h"
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#include "system/filesys.h"
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#include "system/wait.h"
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#include "../include/ctdb_private.h"
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/*
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see if any nodes are dead
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*/
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static void ctdb_check_for_dead_nodes(struct event_context *ev, struct timed_event *te,
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struct timeval t, void *private_data)
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{
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struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
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int i;
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if (ctdb->monitoring_mode==CTDB_MONITORING_DISABLED) {
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event_add_timed(ctdb->ev, ctdb,
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timeval_current_ofs(CTDB_MONITORING_TIMEOUT, 0),
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ctdb_check_for_dead_nodes, ctdb);
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return;
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}
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/* send a keepalive to all other nodes, unless */
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for (i=0;i<ctdb->num_nodes;i++) {
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struct ctdb_node *node = ctdb->nodes[i];
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if (node->vnn == ctdb->vnn) {
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continue;
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}
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/* it might have come alive again */
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if (!(node->flags & NODE_FLAGS_CONNECTED) && node->rx_cnt != 0) {
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ctdb_node_connected(node);
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continue;
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}
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if (node->rx_cnt == 0) {
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node->dead_count++;
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} else {
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node->dead_count = 0;
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}
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node->rx_cnt = 0;
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if (node->dead_count >= CTDB_MONITORING_DEAD_COUNT) {
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ctdb_node_dead(node);
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ctdb_send_keepalive(ctdb, node->vnn);
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/* maybe tell the transport layer to kill the
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sockets as well?
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*/
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continue;
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}
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if (node->tx_cnt == 0 && (node->flags & NODE_FLAGS_CONNECTED)) {
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ctdb_send_keepalive(ctdb, node->vnn);
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}
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node->tx_cnt = 0;
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}
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event_add_timed(ctdb->ev, ctdb,
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timeval_current_ofs(CTDB_MONITORING_TIMEOUT, 0),
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ctdb_check_for_dead_nodes, ctdb);
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}
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/*
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start watching for nodes that might be dead
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*/
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int ctdb_start_monitoring(struct ctdb_context *ctdb)
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{
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event_add_timed(ctdb->ev, ctdb,
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timeval_current_ofs(CTDB_MONITORING_TIMEOUT, 0),
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ctdb_check_for_dead_nodes, ctdb);
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return 0;
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}
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