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https://github.com/samba-team/samba.git
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f50db5cba5
Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Michael Adam <obnox@samba.org>
121 lines
2.9 KiB
C
121 lines
2.9 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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/filesys.h"
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#include "system/network.h"
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#include "system/time.h"
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#include "system/wait.h"
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#include <talloc.h>
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#include <tevent.h>
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#include "lib/util/debug.h"
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#include "lib/util/samba_util.h"
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#include "ctdb_private.h"
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#include "common/common.h"
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#include "common/logging.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 tevent_context *ev,
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struct tevent_timer *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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/* 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->flags & NODE_FLAGS_DELETED) {
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continue;
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}
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if (node->pnn == ctdb->pnn) {
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continue;
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}
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if (node->flags & NODE_FLAGS_DISCONNECTED) {
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/* it might have come alive again */
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if (node->rx_cnt != 0) {
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ctdb_node_connected(node);
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}
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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->tunable.keepalive_limit) {
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DEBUG(DEBUG_NOTICE,("dead count reached for node %u\n", node->pnn));
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ctdb_node_dead(node);
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ctdb_send_keepalive(ctdb, node->pnn);
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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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DEBUG(DEBUG_DEBUG,("sending keepalive to %u\n", node->pnn));
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ctdb_send_keepalive(ctdb, node->pnn);
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node->tx_cnt = 0;
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}
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tevent_add_timer(ctdb->ev, ctdb->keepalive_ctx,
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timeval_current_ofs(ctdb->tunable.keepalive_interval, 0),
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ctdb_check_for_dead_nodes, ctdb);
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}
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void ctdb_start_keepalive(struct ctdb_context *ctdb)
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{
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struct tevent_timer *te;
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ctdb->keepalive_ctx = talloc_new(ctdb);
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CTDB_NO_MEMORY_FATAL(ctdb, ctdb->keepalive_ctx);
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te = tevent_add_timer(ctdb->ev, ctdb->keepalive_ctx,
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timeval_current_ofs(ctdb->tunable.keepalive_interval, 0),
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ctdb_check_for_dead_nodes, ctdb);
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CTDB_NO_MEMORY_FATAL(ctdb, te);
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DEBUG(DEBUG_NOTICE,("Keepalive monitoring has been started\n"));
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}
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void ctdb_stop_keepalive(struct ctdb_context *ctdb)
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{
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talloc_free(ctdb->keepalive_ctx);
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ctdb->keepalive_ctx = NULL;
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}
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