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b029ca4d51
samba-mirror/ctdb/server/ctdb_recoverd.c
Martin Schwenke b029ca4d51 ctdb-recoverd: Drop leader validation 
The introduction of the leader broadcast timeout provides an
alternative to the current leader validation.  Using the leader
broadcast may not be as fast but it is more correct.

When the leader node is stopped or banned, the only way of triggering
an election is currently to fetch the leader's node map to check
whether the it is still active.  This is because the leader will no
longer push the node map to other nodes.  However, having all nodes
fetch the node map from an inactive leader may be unreliable.

Most of the other cases are also handled more reliably by the leader
broadcast timeout.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
2022-01-17 10:21:32 +00:00

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/*
ctdb recovery daemon
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 "replace.h"
#include "system/filesys.h"
#include "system/time.h"
#include "system/network.h"
#include "system/wait.h"
#include <popt.h>
#include <talloc.h>
#include <tevent.h>
#include <tdb.h>
#include "lib/tdb_wrap/tdb_wrap.h"
#include "lib/util/dlinklist.h"
#include "lib/util/debug.h"
#include "lib/util/samba_util.h"
#include "lib/util/sys_rw.h"
#include "lib/util/util_process.h"
#include "ctdb_private.h"
#include "ctdb_client.h"
#include "protocol/protocol_basic.h"
#include "common/system_socket.h"
#include "common/common.h"
#include "common/logging.h"
#include "server/ctdb_config.h"
#include "ctdb_cluster_mutex.h"
#define LEADER_BROADCAST_TIMEOUT 5
/* List of SRVID requests that need to be processed */
struct srvid_list {
struct srvid_list *next, *prev;
struct ctdb_srvid_message *request;
};
struct srvid_requests {
struct srvid_list *requests;
};
static void srvid_request_reply(struct ctdb_context *ctdb,
struct ctdb_srvid_message *request,
TDB_DATA result)
{
/* Someone that sent srvid==0 does not want a reply */
if (request->srvid == 0) {
talloc_free(request);
return;
}
if (ctdb_client_send_message(ctdb, request->pnn, request->srvid,
result) == 0) {
DEBUG(DEBUG_INFO,("Sent SRVID reply to %u:%llu\n",
(unsigned)request->pnn,
(unsigned long long)request->srvid));
} else {
DEBUG(DEBUG_ERR,("Failed to send SRVID reply to %u:%llu\n",
(unsigned)request->pnn,
(unsigned long long)request->srvid));
}
talloc_free(request);
}
static void srvid_requests_reply(struct ctdb_context *ctdb,
struct srvid_requests **requests,
TDB_DATA result)
{
struct srvid_list *r;
if (*requests == NULL) {
return;
}
for (r = (*requests)->requests; r != NULL; r = r->next) {
srvid_request_reply(ctdb, r->request, result);
}
/* Free the list structure... */
TALLOC_FREE(*requests);
}
static void srvid_request_add(struct ctdb_context *ctdb,
struct srvid_requests **requests,
struct ctdb_srvid_message *request)
{
struct srvid_list *t;
int32_t ret;
TDB_DATA result;
if (*requests == NULL) {
*requests = talloc_zero(ctdb, struct srvid_requests);
if (*requests == NULL) {
goto nomem;
}
}
t = talloc_zero(*requests, struct srvid_list);
if (t == NULL) {
/* If *requests was just allocated above then free it */
if ((*requests)->requests == NULL) {
TALLOC_FREE(*requests);
}
goto nomem;
}
t->request = (struct ctdb_srvid_message *)talloc_steal(t, request);
DLIST_ADD((*requests)->requests, t);
return;
nomem:
/* Failed to add the request to the list. Send a fail. */
DEBUG(DEBUG_ERR, (__location__
" Out of memory, failed to queue SRVID request\n"));
ret = -ENOMEM;
result.dsize = sizeof(ret);
result.dptr = (uint8_t *)&ret;
srvid_request_reply(ctdb, request, result);
}
/* An abstraction to allow an operation (takeover runs, recoveries,
* ...) to be disabled for a given timeout */
struct ctdb_op_state {
struct tevent_timer *timer;
bool in_progress;
const char *name;
};
static struct ctdb_op_state *ctdb_op_init(TALLOC_CTX *mem_ctx, const char *name)
{
struct ctdb_op_state *state = talloc_zero(mem_ctx, struct ctdb_op_state);
if (state != NULL) {
state->in_progress = false;
state->name = name;
}
return state;
}
static bool ctdb_op_is_disabled(struct ctdb_op_state *state)
{
return state->timer != NULL;
}
static bool ctdb_op_begin(struct ctdb_op_state *state)
{
if (ctdb_op_is_disabled(state)) {
DEBUG(DEBUG_NOTICE,
("Unable to begin - %s are disabled\n", state->name));
return false;
}
state->in_progress = true;
return true;
}
static bool ctdb_op_end(struct ctdb_op_state *state)
{
return state->in_progress = false;
}
static bool ctdb_op_is_in_progress(struct ctdb_op_state *state)
{
return state->in_progress;
}
static void ctdb_op_enable(struct ctdb_op_state *state)
{
TALLOC_FREE(state->timer);
}
static void ctdb_op_timeout_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval yt, void *p)
{
struct ctdb_op_state *state =
talloc_get_type(p, struct ctdb_op_state);
DEBUG(DEBUG_NOTICE,("Reenabling %s after timeout\n", state->name));
ctdb_op_enable(state);
}
static int ctdb_op_disable(struct ctdb_op_state *state,
struct tevent_context *ev,
uint32_t timeout)
{
if (timeout == 0) {
DEBUG(DEBUG_NOTICE,("Reenabling %s\n", state->name));
ctdb_op_enable(state);
return 0;
}
if (state->in_progress) {
DEBUG(DEBUG_ERR,
("Unable to disable %s - in progress\n", state->name));
return -EAGAIN;
}
DEBUG(DEBUG_NOTICE,("Disabling %s for %u seconds\n",
state->name, timeout));
/* Clear any old timers */
talloc_free(state->timer);
/* Arrange for the timeout to occur */
state->timer = tevent_add_timer(ev, state,
timeval_current_ofs(timeout, 0),
ctdb_op_timeout_handler, state);
if (state->timer == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Unable to setup timer\n"));
return -ENOMEM;
}
return 0;
}
struct ctdb_banning_state {
uint32_t count;
struct timeval last_reported_time;
};
struct ctdb_recovery_lock_handle;
/*
private state of recovery daemon
*/
struct ctdb_recoverd {
struct ctdb_context *ctdb;
uint32_t leader;
struct tevent_timer *leader_broadcast_te;
struct tevent_timer *leader_broadcast_timeout_te;
unsigned int leader_broadcast_timeout;
uint32_t pnn;
uint32_t last_culprit_node;
struct ctdb_node_map_old *nodemap;
struct timeval priority_time;
bool need_takeover_run;
bool need_recovery;
uint32_t node_flags;
struct tevent_timer *send_election_te;
bool election_in_progress;
struct tevent_timer *election_timeout;
struct srvid_requests *reallocate_requests;
struct ctdb_op_state *takeover_run;
struct ctdb_op_state *recovery;
struct ctdb_iface_list_old *ifaces;
uint32_t *force_rebalance_nodes;
struct ctdb_node_capabilities *caps;
bool frozen_on_inactive;
struct ctdb_recovery_lock_handle *recovery_lock_handle;
pid_t helper_pid;
};
#define CONTROL_TIMEOUT() timeval_current_ofs(ctdb->tunable.recover_timeout, 0)
#define MONITOR_TIMEOUT() timeval_current_ofs(ctdb->tunable.recover_interval, 0)
static void ctdb_restart_recd(struct tevent_context *ev,
struct tevent_timer *te, struct timeval t,
void *private_data);
static bool this_node_is_leader(struct ctdb_recoverd *rec)
{
return rec->leader == rec->pnn;
}
static bool this_node_can_be_leader(struct ctdb_recoverd *rec)
{
return (rec->node_flags & NODE_FLAGS_INACTIVE) == 0 &&
(rec->ctdb->capabilities & CTDB_CAP_RECMASTER) != 0;
}
/*
ban a node for a period of time
*/
static void ctdb_ban_node(struct ctdb_recoverd *rec, uint32_t pnn)
{
int ret;
struct ctdb_context *ctdb = rec->ctdb;
uint32_t ban_time = ctdb->tunable.recovery_ban_period;
struct ctdb_ban_state bantime;
if (!ctdb_validate_pnn(ctdb, pnn)) {
DEBUG(DEBUG_ERR,("Bad pnn %u in ctdb_ban_node\n", pnn));
return;
}
DEBUG(DEBUG_NOTICE,("Banning node %u for %u seconds\n", pnn, ban_time));
bantime.pnn = pnn;
bantime.time = ban_time;
ret = ctdb_ctrl_set_ban(ctdb, CONTROL_TIMEOUT(), pnn, &bantime);
if (ret != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to ban node %d\n", pnn));
return;
}
}
enum monitor_result { MONITOR_OK, MONITOR_RECOVERY_NEEDED, MONITOR_ELECTION_NEEDED, MONITOR_FAILED};
/*
remember the trouble maker
*/
static void ctdb_set_culprit_count(struct ctdb_recoverd *rec, uint32_t culprit, uint32_t count)
{
struct ctdb_context *ctdb = talloc_get_type(rec->ctdb, struct ctdb_context);
struct ctdb_banning_state *ban_state;
if (culprit > ctdb->num_nodes) {
DEBUG(DEBUG_ERR,("Trying to set culprit %d but num_nodes is %d\n", culprit, ctdb->num_nodes));
return;
}
/* If we are banned or stopped, do not set other nodes as culprits */
if (rec->node_flags & NODE_FLAGS_INACTIVE) {
DEBUG(DEBUG_NOTICE, ("This node is INACTIVE, cannot set culprit node %d\n", culprit));
return;
}
if (ctdb->nodes[culprit]->ban_state == NULL) {
ctdb->nodes[culprit]->ban_state = talloc_zero(ctdb->nodes[culprit], struct ctdb_banning_state);
CTDB_NO_MEMORY_VOID(ctdb, ctdb->nodes[culprit]->ban_state);
}
ban_state = ctdb->nodes[culprit]->ban_state;
if (timeval_elapsed(&ban_state->last_reported_time) > ctdb->tunable.recovery_grace_period) {
/* this was the first time in a long while this node
misbehaved so we will forgive any old transgressions.
*/
ban_state->count = 0;
}
ban_state->count += count;
ban_state->last_reported_time = timeval_current();
rec->last_culprit_node = culprit;
}
/*
remember the trouble maker
*/
static void ctdb_set_culprit(struct ctdb_recoverd *rec, uint32_t culprit)
{
ctdb_set_culprit_count(rec, culprit, 1);
}
/*
Retrieve capabilities from all connected nodes
*/
static int update_capabilities(struct ctdb_recoverd *rec,
struct ctdb_node_map_old *nodemap)
{
uint32_t *capp;
TALLOC_CTX *tmp_ctx;
struct ctdb_node_capabilities *caps;
struct ctdb_context *ctdb = rec->ctdb;
tmp_ctx = talloc_new(rec);
CTDB_NO_MEMORY(ctdb, tmp_ctx);
caps = ctdb_get_capabilities(ctdb, tmp_ctx,
CONTROL_TIMEOUT(), nodemap);
if (caps == NULL) {
DEBUG(DEBUG_ERR,
(__location__ " Failed to get node capabilities\n"));
talloc_free(tmp_ctx);
return -1;
}
capp = ctdb_get_node_capabilities(caps, rec->pnn);
if (capp == NULL) {
DEBUG(DEBUG_ERR,
(__location__
" Capabilities don't include current node.\n"));
talloc_free(tmp_ctx);
return -1;
}
ctdb->capabilities = *capp;
TALLOC_FREE(rec->caps);
rec->caps = talloc_steal(rec, caps);
talloc_free(tmp_ctx);
return 0;
}
/*
change recovery mode on all nodes
*/
static int set_recovery_mode(struct ctdb_context *ctdb,
struct ctdb_recoverd *rec,
struct ctdb_node_map_old *nodemap,
uint32_t rec_mode)
{
TDB_DATA data;
uint32_t *nodes;
TALLOC_CTX *tmp_ctx;
tmp_ctx = talloc_new(ctdb);
CTDB_NO_MEMORY(ctdb, tmp_ctx);
nodes = list_of_active_nodes(ctdb, nodemap, tmp_ctx, true);
data.dsize = sizeof(uint32_t);
data.dptr = (unsigned char *)&rec_mode;
if (ctdb_client_async_control(ctdb, CTDB_CONTROL_SET_RECMODE,
nodes, 0,
CONTROL_TIMEOUT(),
false, data,
NULL, NULL,
NULL) != 0) {
DEBUG(DEBUG_ERR, (__location__ " Unable to set recovery mode. Recovery failed.\n"));
talloc_free(tmp_ctx);
return -1;
}
talloc_free(tmp_ctx);
return 0;
}
/*
* Update flags on all connected nodes
*/
static int update_flags_on_all_nodes(struct ctdb_recoverd *rec,
uint32_t pnn,
uint32_t flags)
{
struct ctdb_context *ctdb = rec->ctdb;
struct timeval timeout = CONTROL_TIMEOUT();
TDB_DATA data;
struct ctdb_node_map_old *nodemap=NULL;
struct ctdb_node_flag_change c;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
uint32_t *nodes;
uint32_t i;
int ret;
nodemap = rec->nodemap;
for (i = 0; i < nodemap->num; i++) {
if (pnn == nodemap->nodes[i].pnn) {
break;
}
}
if (i >= nodemap->num) {
DBG_ERR("Nodemap does not contain node %d\n", pnn);
talloc_free(tmp_ctx);
return -1;
}
c.pnn = pnn;
c.old_flags = nodemap->nodes[i].flags;
c.new_flags = flags;
data.dsize = sizeof(c);
data.dptr = (unsigned char *)&c;
/* send the flags update to all connected nodes */
nodes = list_of_connected_nodes(ctdb, nodemap, tmp_ctx, true);
ret = ctdb_client_async_control(ctdb,
CTDB_CONTROL_MODIFY_FLAGS,
nodes,
0,
timeout,
false,
data,
NULL,
NULL,
NULL);
if (ret != 0) {
DBG_ERR("Unable to update flags on remote nodes\n");
talloc_free(tmp_ctx);
return -1;
}
talloc_free(tmp_ctx);
return 0;
}
/*
called when ctdb_wait_timeout should finish
*/
static void ctdb_wait_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval yt, void *p)
{
uint32_t *timed_out = (uint32_t *)p;
(*timed_out) = 1;
}
/*
wait for a given number of seconds
*/
static void ctdb_wait_timeout(struct ctdb_context *ctdb, double secs)
{
uint32_t timed_out = 0;
time_t usecs = (secs - (time_t)secs) * 1000000;
tevent_add_timer(ctdb->ev, ctdb, timeval_current_ofs(secs, usecs),
ctdb_wait_handler, &timed_out);
while (!timed_out) {
tevent_loop_once(ctdb->ev);
}
}
/*
* Broadcast cluster leader
*/
static int leader_broadcast_send(struct ctdb_recoverd *rec, uint32_t pnn)
{
struct ctdb_context *ctdb = rec->ctdb;
TDB_DATA data;
int ret;
data.dptr = (uint8_t *)&pnn;
data.dsize = sizeof(pnn);
ret = ctdb_client_send_message(ctdb,
CTDB_BROADCAST_CONNECTED,
CTDB_SRVID_LEADER,
data);
return ret;
}
static int leader_broadcast_loop(struct ctdb_recoverd *rec);
static void ctdb_recovery_unlock(struct ctdb_recoverd *rec);
/* This runs continously but only sends the broadcast when leader */
static void leader_broadcast_loop_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval current_time,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
int ret;
if (!this_node_can_be_leader(rec)) {
if (this_node_is_leader(rec)) {
rec->leader = CTDB_UNKNOWN_PNN;
}
if (rec->ctdb->recovery_lock != NULL &&
rec->recovery_lock_handle != NULL) {
ctdb_recovery_unlock(rec);
}
goto done;
}
if (!this_node_is_leader(rec)) {
goto done;
}
if (rec->election_in_progress) {
goto done;
}
ret = leader_broadcast_send(rec, rec->leader);
if (ret != 0) {
DBG_WARNING("Failed to send leader broadcast\n");
}
done:
ret = leader_broadcast_loop(rec);
if (ret != 0) {
D_WARNING("Failed to set up leader broadcast\n");
}
}
static int leader_broadcast_loop(struct ctdb_recoverd *rec)
{
struct ctdb_context *ctdb = rec->ctdb;
TALLOC_FREE(rec->leader_broadcast_te);
rec->leader_broadcast_te =
tevent_add_timer(ctdb->ev,
rec,
timeval_current_ofs(1, 0),
leader_broadcast_loop_handler,
rec);
if (rec->leader_broadcast_te == NULL) {
return ENOMEM;
}
return 0;
}
static bool leader_broadcast_loop_active(struct ctdb_recoverd *rec)
{
return rec->leader_broadcast_te != NULL;
}
/*
called when an election times out (ends)
*/
static void ctdb_election_timeout(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *p)
{
struct ctdb_recoverd *rec = talloc_get_type(p, struct ctdb_recoverd);
rec->election_in_progress = false;
rec->election_timeout = NULL;
fast_start = false;
D_WARNING("Election period ended, leader=%u\n", rec->leader);
}
/*
wait for an election to finish. It finished election_timeout seconds after
the last election packet is received
*/
static void ctdb_wait_election(struct ctdb_recoverd *rec)
{
struct ctdb_context *ctdb = rec->ctdb;
while (rec->election_in_progress) {
tevent_loop_once(ctdb->ev);
}
}
/*
* Update local flags from all remote connected nodes and push out
* flags changes to all nodes. This is only run by the leader.
*/
static int update_flags(struct ctdb_recoverd *rec,
struct ctdb_node_map_old *nodemap,
struct ctdb_node_map_old **remote_nodemaps)
{
unsigned int j;
struct ctdb_context *ctdb = rec->ctdb;
TALLOC_CTX *mem_ctx = talloc_new(ctdb);
/* Check flags from remote nodes */
for (j=0; j<nodemap->num; j++) {
struct ctdb_node_map_old *remote_nodemap=NULL;
uint32_t local_flags = nodemap->nodes[j].flags;
uint32_t remote_pnn = nodemap->nodes[j].pnn;
uint32_t remote_flags;
unsigned int i;
int ret;
if (local_flags & NODE_FLAGS_DISCONNECTED) {
continue;
}
if (remote_pnn == rec->pnn) {
/*
* No remote nodemap for this node since this
* is the local nodemap. However, still need
* to check this against the remote nodes and
* push it if they are out-of-date.
*/
goto compare_remotes;
}
remote_nodemap = remote_nodemaps[j];
remote_flags = remote_nodemap->nodes[j].flags;
if (local_flags != remote_flags) {
/*
* Update the local copy of the flags in the
* recovery daemon.
*/
D_NOTICE("Remote node %u had flags 0x%x, "
"local had 0x%x - updating local\n",
remote_pnn,
remote_flags,
local_flags);
nodemap->nodes[j].flags = remote_flags;
local_flags = remote_flags;
goto push;
}
compare_remotes:
for (i = 0; i < nodemap->num; i++) {
if (i == j) {
continue;
}
if (nodemap->nodes[i].flags & NODE_FLAGS_DISCONNECTED) {
continue;
}
if (nodemap->nodes[i].pnn == rec->pnn) {
continue;
}
remote_nodemap = remote_nodemaps[i];
remote_flags = remote_nodemap->nodes[j].flags;
if (local_flags != remote_flags) {
goto push;
}
}
continue;
push:
D_NOTICE("Pushing updated flags for node %u (0x%x)\n",
remote_pnn,
local_flags);
ret = update_flags_on_all_nodes(rec, remote_pnn, local_flags);
if (ret != 0) {
DBG_ERR("Unable to update flags on remote nodes\n");
talloc_free(mem_ctx);
return -1;
}
}
talloc_free(mem_ctx);
return 0;
}
/* Create a new random generation id.
The generation id can not be the INVALID_GENERATION id
*/
static uint32_t new_generation(void)
{
uint32_t generation;
while (1) {
generation = random();
if (generation != INVALID_GENERATION) {
break;
}
}
return generation;
}
static bool ctdb_recovery_have_lock(struct ctdb_recoverd *rec)
{
return (rec->recovery_lock_handle != NULL);
}
struct ctdb_recovery_lock_handle {
bool done;
bool locked;
double latency;
struct ctdb_cluster_mutex_handle *h;
struct ctdb_recoverd *rec;
};
static void take_reclock_handler(char status,
double latency,
void *private_data)
{
struct ctdb_recovery_lock_handle *s =
(struct ctdb_recovery_lock_handle *) private_data;
s->locked = (status == '0') ;
/*
* If unsuccessful then ensure the process has exited and that
* the file descriptor event handler has been cancelled
*/
if (! s->locked) {
TALLOC_FREE(s->h);
}
switch (status) {
case '0':
s->latency = latency;
break;
case '1':
D_ERR("Unable to take recovery lock - contention\n");
break;
case '2':
D_ERR("Unable to take recovery lock - timeout\n");
break;
default:
D_ERR("Unable to take recover lock - unknown error\n");
{
struct ctdb_recoverd *rec = s->rec;
D_ERR("Banning this node\n");
ctdb_ban_node(rec, rec->pnn);
}
}
s->done = true;
}
static void force_election(struct ctdb_recoverd *rec);
static void lost_reclock_handler(void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
D_ERR("Recovery lock helper terminated\n");
TALLOC_FREE(rec->recovery_lock_handle);
if (this_node_can_be_leader(rec)) {
force_election(rec);
}
}
static bool ctdb_recovery_lock(struct ctdb_recoverd *rec)
{
struct ctdb_context *ctdb = rec->ctdb;
struct ctdb_cluster_mutex_handle *h;
struct ctdb_recovery_lock_handle *s;
s = talloc_zero(rec, struct ctdb_recovery_lock_handle);
if (s == NULL) {
DBG_ERR("Memory allocation error\n");
return false;
};
s->rec = rec;
h = ctdb_cluster_mutex(s,
ctdb,
ctdb->recovery_lock,
120,
take_reclock_handler,
s,
lost_reclock_handler,
rec);
if (h == NULL) {
talloc_free(s);
return false;
}
rec->recovery_lock_handle = s;
s->h = h;
while (! s->done) {
tevent_loop_once(ctdb->ev);
}
if (! s->locked) {
TALLOC_FREE(rec->recovery_lock_handle);
return false;
}
ctdb_ctrl_report_recd_lock_latency(ctdb,
CONTROL_TIMEOUT(),
s->latency);
return true;
}
static void ctdb_recovery_unlock(struct ctdb_recoverd *rec)
{
if (rec->recovery_lock_handle == NULL) {
return;
}
if (! rec->recovery_lock_handle->done) {
/*
* Taking of recovery lock still in progress. Free
* the cluster mutex handle to release it but leave
* the recovery lock handle in place to allow taking
* of the lock to fail.
*/
D_NOTICE("Cancelling recovery lock\n");
TALLOC_FREE(rec->recovery_lock_handle->h);
rec->recovery_lock_handle->done = true;
rec->recovery_lock_handle->locked = false;
return;
}
D_NOTICE("Releasing recovery lock\n");
TALLOC_FREE(rec->recovery_lock_handle);
}
static void ban_misbehaving_nodes(struct ctdb_recoverd *rec, bool *self_ban)
{
struct ctdb_context *ctdb = rec->ctdb;
unsigned int i;
struct ctdb_banning_state *ban_state;
*self_ban = false;
for (i=0; i<ctdb->num_nodes; i++) {
if (ctdb->nodes[i]->ban_state == NULL) {
continue;
}
ban_state = (struct ctdb_banning_state *)ctdb->nodes[i]->ban_state;
if (ban_state->count < 2*ctdb->num_nodes) {
continue;
}
D_NOTICE("Node %u reached %u banning credits\n",
ctdb->nodes[i]->pnn,
ban_state->count);
ctdb_ban_node(rec, ctdb->nodes[i]->pnn);
ban_state->count = 0;
/* Banning ourself? */
if (ctdb->nodes[i]->pnn == rec->pnn) {
*self_ban = true;
}
}
}
struct helper_state {
int fd[2];
pid_t pid;
int result;
bool done;
};
static void helper_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct helper_state *state = talloc_get_type_abort(
private_data, struct helper_state);
int ret;
ret = sys_read(state->fd[0], &state->result, sizeof(state->result));
if (ret != sizeof(state->result)) {
state->result = EPIPE;
}
state->done = true;
}
static int helper_run(struct ctdb_recoverd *rec, TALLOC_CTX *mem_ctx,
const char *prog, const char *arg, const char *type)
{
struct helper_state *state;
struct tevent_fd *fde;
const char **args;
int nargs, ret;
state = talloc_zero(mem_ctx, struct helper_state);
if (state == NULL) {
DEBUG(DEBUG_ERR, (__location__ " memory error\n"));
return -1;
}
state->pid = -1;
ret = pipe(state->fd);
if (ret != 0) {
DEBUG(DEBUG_ERR,
("Failed to create pipe for %s helper\n", type));
goto fail;
}
set_close_on_exec(state->fd[0]);
nargs = 4;
args = talloc_array(state, const char *, nargs);
if (args == NULL) {
DEBUG(DEBUG_ERR, (__location__ " memory error\n"));
goto fail;
}
args[0] = talloc_asprintf(args, "%d", state->fd[1]);
if (args[0] == NULL) {
DEBUG(DEBUG_ERR, (__location__ " memory error\n"));
goto fail;
}
args[1] = rec->ctdb->daemon.name;
args[2] = arg;
args[3] = NULL;
if (args[2] == NULL) {
nargs = 3;
}
state->pid = ctdb_vfork_exec(state, rec->ctdb, prog, nargs, args);
if (state->pid == -1) {
DEBUG(DEBUG_ERR,
("Failed to create child for %s helper\n", type));
goto fail;
}
close(state->fd[1]);
state->fd[1] = -1;
rec->helper_pid = state->pid;
state->done = false;
fde = tevent_add_fd(rec->ctdb->ev, state, state->fd[0],
TEVENT_FD_READ, helper_handler, state);
if (fde == NULL) {
goto fail;
}
tevent_fd_set_auto_close(fde);
while (!state->done) {
tevent_loop_once(rec->ctdb->ev);
if (!this_node_is_leader(rec)) {
D_ERR("Leader changed to %u, aborting %s\n",
rec->leader,
type);
state->result = 1;
break;
}
}
close(state->fd[0]);
state->fd[0] = -1;
if (state->result != 0) {
goto fail;
}
rec->helper_pid = -1;
ctdb_kill(rec->ctdb, state->pid, SIGKILL);
talloc_free(state);
return 0;
fail:
if (state->fd[0] != -1) {
close(state->fd[0]);
}
if (state->fd[1] != -1) {
close(state->fd[1]);
}
rec->helper_pid = -1;
if (state->pid != -1) {
ctdb_kill(rec->ctdb, state->pid, SIGKILL);
}
talloc_free(state);
return -1;
}
static int ctdb_takeover(struct ctdb_recoverd *rec,
uint32_t *force_rebalance_nodes)
{
static char prog[PATH_MAX+1] = "";
char *arg;
unsigned int i;
int ret;
if (!ctdb_set_helper("takeover_helper", prog, sizeof(prog),
"CTDB_TAKEOVER_HELPER", CTDB_HELPER_BINDIR,
"ctdb_takeover_helper")) {
ctdb_die(rec->ctdb, "Unable to set takeover helper\n");
}
arg = NULL;
for (i = 0; i < talloc_array_length(force_rebalance_nodes); i++) {
uint32_t pnn = force_rebalance_nodes[i];
if (arg == NULL) {
arg = talloc_asprintf(rec, "%u", pnn);
} else {
arg = talloc_asprintf_append(arg, ",%u", pnn);
}
if (arg == NULL) {
DEBUG(DEBUG_ERR, (__location__ " memory error\n"));
return -1;
}
}
if (ctdb_config.failover_disabled) {
ret = setenv("CTDB_DISABLE_IP_FAILOVER", "1", 1);
if (ret != 0) {
D_ERR("Failed to set CTDB_DISABLE_IP_FAILOVER variable\n");
return -1;
}
}
return helper_run(rec, rec, prog, arg, "takeover");
}
static bool do_takeover_run(struct ctdb_recoverd *rec,
struct ctdb_node_map_old *nodemap)
{
uint32_t *nodes = NULL;
struct ctdb_disable_message dtr;
TDB_DATA data;
size_t i;
uint32_t *rebalance_nodes = rec->force_rebalance_nodes;
int ret;
bool ok;
DEBUG(DEBUG_NOTICE, ("Takeover run starting\n"));
if (ctdb_op_is_in_progress(rec->takeover_run)) {
DEBUG(DEBUG_ERR, (__location__
" takeover run already in progress \n"));
ok = false;
goto done;
}
if (!ctdb_op_begin(rec->takeover_run)) {
ok = false;
goto done;
}
/* Disable IP checks (takeover runs, really) on other nodes
* while doing this takeover run. This will stop those other
* nodes from triggering takeover runs when think they should
* be hosting an IP but it isn't yet on an interface. Don't
* wait for replies since a failure here might cause some
* noise in the logs but will not actually cause a problem.
*/
ZERO_STRUCT(dtr);
dtr.srvid = 0; /* No reply */
dtr.pnn = -1;
data.dptr = (uint8_t*)&dtr;
data.dsize = sizeof(dtr);
nodes = list_of_connected_nodes(rec->ctdb, nodemap, rec, false);
/* Disable for 60 seconds. This can be a tunable later if
* necessary.
*/
dtr.timeout = 60;
for (i = 0; i < talloc_array_length(nodes); i++) {
if (ctdb_client_send_message(rec->ctdb, nodes[i],
CTDB_SRVID_DISABLE_TAKEOVER_RUNS,
data) != 0) {
DEBUG(DEBUG_INFO,("Failed to disable takeover runs\n"));
}
}
ret = ctdb_takeover(rec, rec->force_rebalance_nodes);
/* Reenable takeover runs and IP checks on other nodes */
dtr.timeout = 0;
for (i = 0; i < talloc_array_length(nodes); i++) {
if (ctdb_client_send_message(rec->ctdb, nodes[i],
CTDB_SRVID_DISABLE_TAKEOVER_RUNS,
data) != 0) {
DEBUG(DEBUG_INFO,("Failed to re-enable takeover runs\n"));
}
}
if (ret != 0) {
DEBUG(DEBUG_ERR, ("ctdb_takeover_run() failed\n"));
ok = false;
goto done;
}
ok = true;
/* Takeover run was successful so clear force rebalance targets */
if (rebalance_nodes == rec->force_rebalance_nodes) {
TALLOC_FREE(rec->force_rebalance_nodes);
} else {
DEBUG(DEBUG_WARNING,
("Rebalance target nodes changed during takeover run - not clearing\n"));
}
done:
rec->need_takeover_run = !ok;
talloc_free(nodes);
ctdb_op_end(rec->takeover_run);
DEBUG(DEBUG_NOTICE, ("Takeover run %s\n", ok ? "completed successfully" : "unsuccessful"));
return ok;
}
static int db_recovery_parallel(struct ctdb_recoverd *rec, TALLOC_CTX *mem_ctx)
{
static char prog[PATH_MAX+1] = "";
const char *arg;
if (!ctdb_set_helper("recovery_helper", prog, sizeof(prog),
"CTDB_RECOVERY_HELPER", CTDB_HELPER_BINDIR,
"ctdb_recovery_helper")) {
ctdb_die(rec->ctdb, "Unable to set recovery helper\n");
}
arg = talloc_asprintf(mem_ctx, "%u", new_generation());
if (arg == NULL) {
DEBUG(DEBUG_ERR, (__location__ " memory error\n"));
return -1;
}
setenv("CTDB_DBDIR_STATE", rec->ctdb->db_directory_state, 1);
return helper_run(rec, mem_ctx, prog, arg, "recovery");
}
/*
* Main recovery function, only run by leader
*/
static int do_recovery(struct ctdb_recoverd *rec, TALLOC_CTX *mem_ctx)
{
struct ctdb_context *ctdb = rec->ctdb;
struct ctdb_node_map_old *nodemap = rec->nodemap;
unsigned int i;
int ret;
bool self_ban;
DEBUG(DEBUG_NOTICE, (__location__ " Starting do_recovery\n"));
/* Check if the current node is still the leader. It's possible that
* re-election has changed the leader.
*/
if (!this_node_is_leader(rec)) {
D_NOTICE("Leader changed to %u, aborting recovery\n",
rec->leader);
return -1;
}
/* if recovery fails, force it again */
rec->need_recovery = true;
if (!ctdb_op_begin(rec->recovery)) {
return -1;
}
if (rec->election_in_progress) {
/* an election is in progress */
DEBUG(DEBUG_ERR, ("do_recovery called while election in progress - try again later\n"));
goto fail;
}
ban_misbehaving_nodes(rec, &self_ban);
if (self_ban) {
DEBUG(DEBUG_NOTICE, ("This node was banned, aborting recovery\n"));
goto fail;
}
if (ctdb->recovery_lock != NULL) {
if (ctdb_recovery_have_lock(rec)) {
D_NOTICE("Already holding recovery lock\n");
} else {
bool ok;
D_NOTICE("Attempting to take recovery lock (%s)\n",
ctdb->recovery_lock);
ok = ctdb_recovery_lock(rec);
if (! ok) {
D_ERR("Unable to take recovery lock\n");
if (!this_node_is_leader(rec)) {
D_NOTICE("Leader changed to %u,"
" aborting recovery\n",
rec->leader);
rec->need_recovery = false;
goto fail;
}
D_ERR("Abort recovery, ban this node\n");
ctdb_ban_node(rec, rec->pnn);
goto fail;
}
D_NOTICE("Recovery lock taken successfully\n");
}
}
DEBUG(DEBUG_NOTICE, (__location__ " Recovery initiated due to problem with node %u\n", rec->last_culprit_node));
/* Retrieve capabilities from all connected nodes */
ret = update_capabilities(rec, nodemap);
if (ret!=0) {
DEBUG(DEBUG_ERR, (__location__ " Unable to update node capabilities.\n"));
return -1;
}
/*
update all nodes to have the same flags that we have
*/
for (i=0;i<nodemap->num;i++) {
if (nodemap->nodes[i].flags & NODE_FLAGS_DISCONNECTED) {
continue;
}
ret = update_flags_on_all_nodes(rec,
nodemap->nodes[i].pnn,
nodemap->nodes[i].flags);
if (ret != 0) {
if (nodemap->nodes[i].flags & NODE_FLAGS_INACTIVE) {
DEBUG(DEBUG_WARNING, (__location__ "Unable to update flags on inactive node %d\n", i));
} else {
DEBUG(DEBUG_ERR, (__location__ " Unable to update flags on all nodes for node %d\n", i));
return -1;
}
}
}
DEBUG(DEBUG_NOTICE, (__location__ " Recovery - updated flags\n"));
ret = db_recovery_parallel(rec, mem_ctx);
if (ret != 0) {
goto fail;
}
do_takeover_run(rec, nodemap);
/* send a message to all clients telling them that the cluster
has been reconfigured */
ret = ctdb_client_send_message(ctdb, CTDB_BROADCAST_CONNECTED,
CTDB_SRVID_RECONFIGURE, tdb_null);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " Failed to send reconfigure message\n"));
goto fail;
}
DEBUG(DEBUG_NOTICE, (__location__ " Recovery complete\n"));
rec->need_recovery = false;
ctdb_op_end(rec->recovery);
/* we managed to complete a full recovery, make sure to forgive
any past sins by the nodes that could now participate in the
recovery.
*/
DEBUG(DEBUG_ERR,("Resetting ban count to 0 for all nodes\n"));
for (i=0;i<nodemap->num;i++) {
struct ctdb_banning_state *ban_state;
if (nodemap->nodes[i].flags & NODE_FLAGS_DISCONNECTED) {
continue;
}
ban_state = (struct ctdb_banning_state *)ctdb->nodes[nodemap->nodes[i].pnn]->ban_state;
if (ban_state == NULL) {
continue;
}
ban_state->count = 0;
}
/* We just finished a recovery successfully.
We now wait for rerecovery_timeout before we allow
another recovery to take place.
*/
DEBUG(DEBUG_NOTICE, ("Just finished a recovery. New recoveries will now be suppressed for the rerecovery timeout (%d seconds)\n", ctdb->tunable.rerecovery_timeout));
ctdb_op_disable(rec->recovery, ctdb->ev,
ctdb->tunable.rerecovery_timeout);
return 0;
fail:
ctdb_op_end(rec->recovery);
return -1;
}
/*
elections are won by first checking the number of connected nodes, then
the priority time, then the pnn
*/
struct election_message {
uint32_t num_connected;
struct timeval priority_time;
uint32_t pnn;
uint32_t node_flags;
};
/*
form this nodes election data
*/
static void ctdb_election_data(struct ctdb_recoverd *rec, struct election_message *em)
{
unsigned int i;
int ret;
struct ctdb_node_map_old *nodemap;
struct ctdb_context *ctdb = rec->ctdb;
ZERO_STRUCTP(em);
em->pnn = rec->pnn;
em->priority_time = rec->priority_time;
ret = ctdb_ctrl_getnodemap(ctdb, CONTROL_TIMEOUT(), CTDB_CURRENT_NODE, rec, &nodemap);
if (ret != 0) {
DEBUG(DEBUG_ERR,(__location__ " unable to get node map\n"));
return;
}
rec->node_flags = nodemap->nodes[rec->pnn].flags;
em->node_flags = rec->node_flags;
for (i=0;i<nodemap->num;i++) {
if (!(nodemap->nodes[i].flags & NODE_FLAGS_DISCONNECTED)) {
em->num_connected++;
}
}
if (!this_node_can_be_leader(rec)) {
/* Try to lose... */
em->num_connected = 0;
em->priority_time = timeval_current();
}
talloc_free(nodemap);
}
/*
see if the given election data wins
*/
static bool ctdb_election_win(struct ctdb_recoverd *rec, struct election_message *em)
{
struct election_message myem;
int cmp = 0;
ctdb_election_data(rec, &myem);
if (!this_node_can_be_leader(rec)) {
return false;
}
/* we will automatically win if the other node is banned */
if (em->node_flags & NODE_FLAGS_BANNED) {
return true;
}
/* we will automatically win if the other node is banned */
if (em->node_flags & NODE_FLAGS_STOPPED) {
return true;
}
/* then the longest running node */
if (cmp == 0) {
cmp = timeval_compare(&em->priority_time, &myem.priority_time);
}
if (cmp == 0) {
cmp = (int)myem.pnn - (int)em->pnn;
}
return cmp > 0;
}
/*
send out an election request
*/
static int send_election_request(struct ctdb_recoverd *rec)
{
int ret;
TDB_DATA election_data;
struct election_message emsg;
uint64_t srvid;
struct ctdb_context *ctdb = rec->ctdb;
srvid = CTDB_SRVID_ELECTION;
ctdb_election_data(rec, &emsg);
election_data.dsize = sizeof(struct election_message);
election_data.dptr = (unsigned char *)&emsg;
/* first we assume we will win the election and set
recoverymaster to be ourself on the current node
*/
ret = ctdb_ctrl_setrecmaster(ctdb,
CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE,
rec->pnn);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " failed to set recmaster\n"));
return -1;
}
rec->leader = rec->pnn;
/* send an election message to all active nodes */
DEBUG(DEBUG_INFO,(__location__ " Send election request to all active nodes\n"));
return ctdb_client_send_message(ctdb, CTDB_BROADCAST_ALL, srvid, election_data);
}
/*
we think we are winning the election - send a broadcast election request
*/
static void election_send_request(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *p)
{
struct ctdb_recoverd *rec = talloc_get_type(p, struct ctdb_recoverd);
int ret;
ret = send_election_request(rec);
if (ret != 0) {
DEBUG(DEBUG_ERR,("Failed to send election request!\n"));
}
TALLOC_FREE(rec->send_election_te);
}
/*
handler for memory dumps
*/
static void mem_dump_handler(uint64_t srvid, TDB_DATA data, void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
struct ctdb_context *ctdb = rec->ctdb;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
TDB_DATA *dump;
int ret;
struct ctdb_srvid_message *rd;
if (data.dsize != sizeof(struct ctdb_srvid_message)) {
DEBUG(DEBUG_ERR, (__location__ " Wrong size of return address.\n"));
talloc_free(tmp_ctx);
return;
}
rd = (struct ctdb_srvid_message *)data.dptr;
dump = talloc_zero(tmp_ctx, TDB_DATA);
if (dump == NULL) {
DEBUG(DEBUG_ERR, (__location__ " Failed to allocate memory for memdump\n"));
talloc_free(tmp_ctx);
return;
}
ret = ctdb_dump_memory(ctdb, dump);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " ctdb_dump_memory() failed\n"));
talloc_free(tmp_ctx);
return;
}
DBG_ERR("recovery daemon memory dump\n");
ret = ctdb_client_send_message(ctdb, rd->pnn, rd->srvid, *dump);
if (ret != 0) {
DEBUG(DEBUG_ERR,("Failed to send rd memdump reply message\n"));
talloc_free(tmp_ctx);
return;
}
talloc_free(tmp_ctx);
}
/*
handler for reload_nodes
*/
static void reload_nodes_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
DEBUG(DEBUG_ERR, (__location__ " Reload nodes file from recovery daemon\n"));
ctdb_load_nodes_file(rec->ctdb);
}
static void recd_node_rebalance_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
struct ctdb_context *ctdb = rec->ctdb;
uint32_t pnn;
uint32_t *t;
int len;
if (!this_node_is_leader(rec)) {
return;
}
if (data.dsize != sizeof(uint32_t)) {
DEBUG(DEBUG_ERR,(__location__ " Incorrect size of node rebalance message. Was %zd but expected %zd bytes\n", data.dsize, sizeof(uint32_t)));
return;
}
pnn = *(uint32_t *)&data.dptr[0];
DEBUG(DEBUG_NOTICE,("Setting up rebalance of IPs to node %u\n", pnn));
/* Copy any existing list of nodes. There's probably some
* sort of realloc variant that will do this but we need to
* make sure that freeing the old array also cancels the timer
* event for the timeout... not sure if realloc will do that.
*/
len = (rec->force_rebalance_nodes != NULL) ?
talloc_array_length(rec->force_rebalance_nodes) :
0;
/* This allows duplicates to be added but they don't cause
* harm. A call to add a duplicate PNN arguably means that
* the timeout should be reset, so this is the simplest
* solution.
*/
t = talloc_zero_array(rec, uint32_t, len+1);
CTDB_NO_MEMORY_VOID(ctdb, t);
if (len > 0) {
memcpy(t, rec->force_rebalance_nodes, sizeof(uint32_t) * len);
}
t[len] = pnn;
talloc_free(rec->force_rebalance_nodes);
rec->force_rebalance_nodes = t;
}
static void srvid_disable_and_reply(struct ctdb_recoverd *rec,
TDB_DATA data,
struct ctdb_op_state *op_state)
{
struct ctdb_context *ctdb = rec->ctdb;
struct ctdb_disable_message *r;
uint32_t timeout;
TDB_DATA result;
int32_t ret = 0;
/* Validate input data */
if (data.dsize != sizeof(struct ctdb_disable_message)) {
DEBUG(DEBUG_ERR,(__location__ " Wrong size for data :%lu "
"expecting %lu\n", (long unsigned)data.dsize,
(long unsigned)sizeof(struct ctdb_srvid_message)));
return;
}
if (data.dptr == NULL) {
DEBUG(DEBUG_ERR,(__location__ " No data received\n"));
return;
}
r = (struct ctdb_disable_message *)data.dptr;
timeout = r->timeout;
ret = ctdb_op_disable(op_state, ctdb->ev, timeout);
if (ret != 0) {
goto done;
}
/* Returning our PNN tells the caller that we succeeded */
ret = rec->pnn;
done:
result.dsize = sizeof(int32_t);
result.dptr = (uint8_t *)&ret;
srvid_request_reply(ctdb, (struct ctdb_srvid_message *)r, result);
}
static void disable_takeover_runs_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
srvid_disable_and_reply(rec, data, rec->takeover_run);
}
/* Backward compatibility for this SRVID */
static void disable_ip_check_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
uint32_t timeout;
if (data.dsize != sizeof(uint32_t)) {
DEBUG(DEBUG_ERR,(__location__ " Wrong size for data :%lu "
"expecting %lu\n", (long unsigned)data.dsize,
(long unsigned)sizeof(uint32_t)));
return;
}
if (data.dptr == NULL) {
DEBUG(DEBUG_ERR,(__location__ " No data received\n"));
return;
}
timeout = *((uint32_t *)data.dptr);
ctdb_op_disable(rec->takeover_run, rec->ctdb->ev, timeout);
}
static void disable_recoveries_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
srvid_disable_and_reply(rec, data, rec->recovery);
}
/*
handler for ip reallocate, just add it to the list of requests and
handle this later in the monitor_cluster loop so we do not recurse
with other requests to takeover_run()
*/
static void ip_reallocate_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_srvid_message *request;
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
if (data.dsize != sizeof(struct ctdb_srvid_message)) {
DEBUG(DEBUG_ERR, (__location__ " Wrong size of return address.\n"));
return;
}
request = (struct ctdb_srvid_message *)data.dptr;
srvid_request_add(rec->ctdb, &rec->reallocate_requests, request);
}
static void process_ipreallocate_requests(struct ctdb_context *ctdb,
struct ctdb_recoverd *rec)
{
TDB_DATA result;
int32_t ret;
struct srvid_requests *current;
/* Only process requests that are currently pending. More
* might come in while the takeover run is in progress and
* they will need to be processed later since they might
* be in response flag changes.
*/
current = rec->reallocate_requests;
rec->reallocate_requests = NULL;
if (do_takeover_run(rec, rec->nodemap)) {
ret = rec->pnn;
} else {
ret = -1;
}
result.dsize = sizeof(int32_t);
result.dptr = (uint8_t *)&ret;
srvid_requests_reply(ctdb, &current, result);
}
/*
* handler for assigning banning credits
*/
static void banning_handler(uint64_t srvid, TDB_DATA data, void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
uint32_t ban_pnn;
/* Ignore if we are not leader */
if (!this_node_is_leader(rec)) {
return;
}
if (data.dsize != sizeof(uint32_t)) {
DEBUG(DEBUG_ERR, (__location__ "invalid data size %zu\n",
data.dsize));
return;
}
ban_pnn = *(uint32_t *)data.dptr;
ctdb_set_culprit_count(rec, ban_pnn, rec->nodemap->num);
}
/*
* Handler for leader elections
*/
static void election_handler(uint64_t srvid, TDB_DATA data, void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
struct ctdb_context *ctdb = rec->ctdb;
int ret;
struct election_message *em = (struct election_message *)data.dptr;
/* Ignore election packets from ourself */
if (rec->pnn == em->pnn) {
return;
}
/* we got an election packet - update the timeout for the election */
talloc_free(rec->election_timeout);
rec->election_in_progress = true;
rec->election_timeout = tevent_add_timer(
ctdb->ev, ctdb,
fast_start ?
timeval_current_ofs(0, 500000) :
timeval_current_ofs(ctdb->tunable.election_timeout, 0),
ctdb_election_timeout, rec);
/* someone called an election. check their election data
and if we disagree and we would rather be the elected node,
send a new election message to all other nodes
*/
if (ctdb_election_win(rec, em)) {
if (!rec->send_election_te) {
rec->send_election_te = tevent_add_timer(
ctdb->ev, rec,
timeval_current_ofs(0, 500000),
election_send_request, rec);
}
return;
}
/* we didn't win */
TALLOC_FREE(rec->send_election_te);
/* Release the recovery lock file */
if (ctdb_recovery_have_lock(rec)) {
ctdb_recovery_unlock(rec);
}
/* Set leader to the winner of this round */
ret = ctdb_ctrl_setrecmaster(ctdb, CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE, em->pnn);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " failed to set recmaster"));
return;
}
rec->leader = em->pnn;
return;
}
/*
force the start of the election process
*/
static void force_election(struct ctdb_recoverd *rec)
{
int ret;
struct ctdb_context *ctdb = rec->ctdb;
DEBUG(DEBUG_INFO,(__location__ " Force an election\n"));
/* set all nodes to recovery mode to stop all internode traffic */
ret = set_recovery_mode(ctdb, rec, rec->nodemap, CTDB_RECOVERY_ACTIVE);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " Unable to set recovery mode to active on cluster\n"));
return;
}
talloc_free(rec->election_timeout);
rec->election_in_progress = true;
rec->election_timeout = tevent_add_timer(
ctdb->ev, ctdb,
fast_start ?
timeval_current_ofs(0, 500000) :
timeval_current_ofs(ctdb->tunable.election_timeout, 0),
ctdb_election_timeout, rec);
ret = send_election_request(rec);
if (ret!=0) {
DBG_ERR("Failed to initiate leader election");
return;
}
/* wait for a few seconds to collect all responses */
ctdb_wait_election(rec);
}
static void srvid_not_implemented(uint64_t srvid,
TDB_DATA data,
void *private_data)
{
const char *s;
switch (srvid) {
case CTDB_SRVID_SET_NODE_FLAGS:
s = "CTDB_SRVID_SET_NODE_FLAGS";
break;
default:
s = "UNKNOWN";
}
D_WARNING("SRVID %s (0x%" PRIx64 ") is obsolete\n", s, srvid);
}
/*
handler for when we need to push out flag changes to all other nodes
*/
static void push_flags_handler(uint64_t srvid, TDB_DATA data,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type(
private_data, struct ctdb_recoverd);
struct ctdb_context *ctdb = rec->ctdb;
int ret;
struct ctdb_node_flag_change *c = (struct ctdb_node_flag_change *)data.dptr;
struct ctdb_node_map_old *nodemap=NULL;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
uint32_t *nodes;
/* read the node flags from the leader */
ret = ctdb_ctrl_getnodemap(ctdb, CONTROL_TIMEOUT(), rec->leader,
tmp_ctx, &nodemap);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " Unable to get nodemap from node %u\n", c->pnn));
talloc_free(tmp_ctx);
return;
}
if (c->pnn >= nodemap->num) {
DBG_ERR("Nodemap from leader does not contain node %d\n",
c->pnn);
talloc_free(tmp_ctx);
return;
}
/* send the flags update to all connected nodes */
nodes = list_of_connected_nodes(ctdb, nodemap, tmp_ctx, true);
if (ctdb_client_async_control(ctdb, CTDB_CONTROL_MODIFY_FLAGS,
nodes, 0, CONTROL_TIMEOUT(),
false, data,
NULL, NULL,
NULL) != 0) {
DEBUG(DEBUG_ERR, (__location__ " ctdb_control to modify node flags failed\n"));
talloc_free(tmp_ctx);
return;
}
talloc_free(tmp_ctx);
}
static void leader_broadcast_timeout_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval current_time,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
rec->leader_broadcast_timeout_te = NULL;
/* Let other nodes know that an election is underway */
leader_broadcast_send(rec, CTDB_UNKNOWN_PNN);
D_NOTICE("Leader broadcast timeout. Force election\n");
force_election(rec);
}
static void leader_broadcast_timeout_cancel(struct ctdb_recoverd *rec)
{
TALLOC_FREE(rec->leader_broadcast_timeout_te);
}
static int leader_broadcast_timeout_start(struct ctdb_recoverd *rec)
{
struct ctdb_context *ctdb = rec->ctdb;
/*
* This should not be necessary. However, there will be
* interactions with election code here. It will want to
* cancel and restart the timer around potentially long
* elections.
*/
leader_broadcast_timeout_cancel(rec);
rec->leader_broadcast_timeout_te =
tevent_add_timer(
ctdb->ev,
rec,
timeval_current_ofs(rec->leader_broadcast_timeout, 0),
leader_broadcast_timeout_handler,
rec);
if (rec->leader_broadcast_timeout_te == NULL) {
D_ERR("Unable to start leader broadcast timeout\n");
return ENOMEM;
}
return 0;
}
static bool leader_broadcast_timeout_active(struct ctdb_recoverd *rec)
{
return rec->leader_broadcast_timeout_te != NULL;
}
static void leader_handler(uint64_t srvid, TDB_DATA data, void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
struct ctdb_context *ctdb = rec->ctdb;
uint32_t pnn;
size_t npull;
int ret;
ret = ctdb_uint32_pull(data.dptr, data.dsize, &pnn, &npull);
if (ret != 0) {
DBG_WARNING("Unable to parse leader broadcast, ret=%d\n", ret);
return;
}
leader_broadcast_timeout_cancel(rec);
if (pnn == rec->leader) {
goto done;
}
if (pnn == CTDB_UNKNOWN_PNN) {
/*
* Leader broadcast timeout was cancelled above - stop
* main loop from restarting it until election is
* complete
*/
rec->election_in_progress = true;
return;
}
D_NOTICE("Received leader broadcast, leader=%"PRIu32"\n", pnn);
ret = ctdb_ctrl_setrecmaster(ctdb,
CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE,
pnn);
if (ret != 0) {
DBG_WARNING("Failed to set leader\n");
goto done;
}
rec->leader = pnn;
done:
leader_broadcast_timeout_start(rec);
}
struct verify_recmode_normal_data {
uint32_t count;
enum monitor_result status;
};
static void verify_recmode_normal_callback(struct ctdb_client_control_state *state)
{
struct verify_recmode_normal_data *rmdata = talloc_get_type(state->async.private_data, struct verify_recmode_normal_data);
/* one more node has responded with recmode data*/
rmdata->count--;
/* if we failed to get the recmode, then return an error and let
the main loop try again.
*/
if (state->state != CTDB_CONTROL_DONE) {
if (rmdata->status == MONITOR_OK) {
rmdata->status = MONITOR_FAILED;
}
return;
}
/* if we got a response, then the recmode will be stored in the
status field
*/
if (state->status != CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_NOTICE, ("Node:%u was in recovery mode. Start recovery process\n", state->c->hdr.destnode));
rmdata->status = MONITOR_RECOVERY_NEEDED;
}
return;
}
/* verify that all nodes are in normal recovery mode */
static enum monitor_result verify_recmode(struct ctdb_context *ctdb, struct ctdb_node_map_old *nodemap)
{
struct verify_recmode_normal_data *rmdata;
TALLOC_CTX *mem_ctx = talloc_new(ctdb);
struct ctdb_client_control_state *state;
enum monitor_result status;
unsigned int j;
rmdata = talloc(mem_ctx, struct verify_recmode_normal_data);
CTDB_NO_MEMORY_FATAL(ctdb, rmdata);
rmdata->count = 0;
rmdata->status = MONITOR_OK;
/* loop over all active nodes and send an async getrecmode call to
them*/
for (j=0; j<nodemap->num; j++) {
if (nodemap->nodes[j].flags & NODE_FLAGS_INACTIVE) {
continue;
}
state = ctdb_ctrl_getrecmode_send(ctdb, mem_ctx,
CONTROL_TIMEOUT(),
nodemap->nodes[j].pnn);
if (state == NULL) {
/* we failed to send the control, treat this as
an error and try again next iteration
*/
DEBUG(DEBUG_ERR,("Failed to call ctdb_ctrl_getrecmode_send during monitoring\n"));
talloc_free(mem_ctx);
return MONITOR_FAILED;
}
/* set up the callback functions */
state->async.fn = verify_recmode_normal_callback;
state->async.private_data = rmdata;
/* one more control to wait for to complete */
rmdata->count++;
}
/* now wait for up to the maximum number of seconds allowed
or until all nodes we expect a response from has replied
*/
while (rmdata->count > 0) {
tevent_loop_once(ctdb->ev);
}
status = rmdata->status;
talloc_free(mem_ctx);
return status;
}
struct verify_recmaster_data {
struct ctdb_recoverd *rec;
uint32_t count;
uint32_t pnn;
enum monitor_result status;
};
static void verify_recmaster_callback(struct ctdb_client_control_state *state)
{
struct verify_recmaster_data *rmdata = talloc_get_type(state->async.private_data, struct verify_recmaster_data);
/* one more node has responded with recmaster data*/
rmdata->count--;
/* if we failed to get the recmaster, then return an error and let
the main loop try again.
*/
if (state->state != CTDB_CONTROL_DONE) {
if (rmdata->status == MONITOR_OK) {
rmdata->status = MONITOR_FAILED;
}
return;
}
/* if we got a response, then the recmaster will be stored in the
status field
*/
if ((uint32_t)state->status != rmdata->pnn) {
DEBUG(DEBUG_ERR,("Node %d thinks node %d is recmaster. Need a new recmaster election\n", state->c->hdr.destnode, state->status));
ctdb_set_culprit(rmdata->rec, state->c->hdr.destnode);
rmdata->status = MONITOR_ELECTION_NEEDED;
}
return;
}
/* verify that all nodes agree that we are the recmaster */
static enum monitor_result verify_recmaster(struct ctdb_recoverd *rec, struct ctdb_node_map_old *nodemap, uint32_t pnn)
{
struct ctdb_context *ctdb = rec->ctdb;
struct verify_recmaster_data *rmdata;
TALLOC_CTX *mem_ctx = talloc_new(ctdb);
struct ctdb_client_control_state *state;
enum monitor_result status;
unsigned int j;
rmdata = talloc(mem_ctx, struct verify_recmaster_data);
CTDB_NO_MEMORY_FATAL(ctdb, rmdata);
rmdata->rec = rec;
rmdata->count = 0;
rmdata->pnn = pnn;
rmdata->status = MONITOR_OK;
/* loop over all active nodes and send an async getrecmaster call to
them*/
for (j=0; j<nodemap->num; j++) {
if (nodemap->nodes[j].pnn == rec->leader) {
continue;
}
if (nodemap->nodes[j].flags & NODE_FLAGS_INACTIVE) {
continue;
}
state = ctdb_ctrl_getrecmaster_send(ctdb, mem_ctx,
CONTROL_TIMEOUT(),
nodemap->nodes[j].pnn);
if (state == NULL) {
/* we failed to send the control, treat this as
an error and try again next iteration
*/
DEBUG(DEBUG_ERR,("Failed to call ctdb_ctrl_getrecmaster_send during monitoring\n"));
talloc_free(mem_ctx);
return MONITOR_FAILED;
}
/* set up the callback functions */
state->async.fn = verify_recmaster_callback;
state->async.private_data = rmdata;
/* one more control to wait for to complete */
rmdata->count++;
}
/* now wait for up to the maximum number of seconds allowed
or until all nodes we expect a response from has replied
*/
while (rmdata->count > 0) {
tevent_loop_once(ctdb->ev);
}
status = rmdata->status;
talloc_free(mem_ctx);
return status;
}
static bool interfaces_have_changed(struct ctdb_context *ctdb,
struct ctdb_recoverd *rec)
{
struct ctdb_iface_list_old *ifaces = NULL;
TALLOC_CTX *mem_ctx;
bool ret = false;
mem_ctx = talloc_new(NULL);
/* Read the interfaces from the local node */
if (ctdb_ctrl_get_ifaces(ctdb, CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE, mem_ctx, &ifaces) != 0) {
D_ERR("Unable to get interfaces from local node %u\n", rec->pnn);
/* We could return an error. However, this will be
* rare so we'll decide that the interfaces have
* actually changed, just in case.
*/
talloc_free(mem_ctx);
return true;
}
if (!rec->ifaces) {
/* We haven't been here before so things have changed */
DEBUG(DEBUG_NOTICE, ("Initial interface fetched\n"));
ret = true;
} else if (rec->ifaces->num != ifaces->num) {
/* Number of interfaces has changed */
DEBUG(DEBUG_NOTICE, ("Interface count changed from %d to %d\n",
rec->ifaces->num, ifaces->num));
ret = true;
} else {
/* See if interface names or link states have changed */
unsigned int i;
for (i = 0; i < rec->ifaces->num; i++) {
struct ctdb_iface * iface = &rec->ifaces->ifaces[i];
if (strcmp(iface->name, ifaces->ifaces[i].name) != 0) {
DEBUG(DEBUG_NOTICE,
("Interface in slot %d changed: %s => %s\n",
i, iface->name, ifaces->ifaces[i].name));
ret = true;
break;
}
if (iface->link_state != ifaces->ifaces[i].link_state) {
DEBUG(DEBUG_NOTICE,
("Interface %s changed state: %d => %d\n",
iface->name, iface->link_state,
ifaces->ifaces[i].link_state));
ret = true;
break;
}
}
}
talloc_free(rec->ifaces);
rec->ifaces = talloc_steal(rec, ifaces);
talloc_free(mem_ctx);
return ret;
}
/* Check that the local allocation of public IP addresses is correct
* and do some house-keeping */
static int verify_local_ip_allocation(struct ctdb_recoverd *rec)
{
TALLOC_CTX *mem_ctx = talloc_new(NULL);
struct ctdb_context *ctdb = rec->ctdb;
unsigned int j;
int ret;
bool need_takeover_run = false;
struct ctdb_public_ip_list_old *ips = NULL;
/* If we are not the leader then do some housekeeping */
if (!this_node_is_leader(rec)) {
/* Ignore any IP reallocate requests - only leader
* processes them
*/
TALLOC_FREE(rec->reallocate_requests);
/* Clear any nodes that should be force rebalanced in
* the next takeover run. If the leader has changed
* then we don't want to process these some time in
* the future.
*/
TALLOC_FREE(rec->force_rebalance_nodes);
}
/* Return early if disabled... */
if (ctdb_config.failover_disabled ||
ctdb_op_is_disabled(rec->takeover_run)) {
talloc_free(mem_ctx);
return 0;
}
if (interfaces_have_changed(ctdb, rec)) {
need_takeover_run = true;
}
/* If there are unhosted IPs but this node can host them then
* trigger an IP reallocation */
/* Read *available* IPs from local node */
ret = ctdb_ctrl_get_public_ips_flags(
ctdb, CONTROL_TIMEOUT(), CTDB_CURRENT_NODE, mem_ctx,
CTDB_PUBLIC_IP_FLAGS_ONLY_AVAILABLE, &ips);
if (ret != 0) {
DEBUG(DEBUG_ERR, ("Unable to retrieve available public IPs\n"));
talloc_free(mem_ctx);
return -1;
}
for (j=0; j<ips->num; j++) {
if (ips->ips[j].pnn == CTDB_UNKNOWN_PNN &&
rec->nodemap->nodes[rec->pnn].flags == 0) {
DEBUG(DEBUG_WARNING,
("Unassigned IP %s can be served by this node\n",
ctdb_addr_to_str(&ips->ips[j].addr)));
need_takeover_run = true;
}
}
talloc_free(ips);
if (!ctdb->do_checkpublicip) {
goto done;
}
/* Validate the IP addresses that this node has on network
* interfaces. If there is an inconsistency between reality
* and the state expected by CTDB then try to fix it by
* triggering an IP reallocation or releasing extraneous IP
* addresses. */
/* Read *known* IPs from local node */
ret = ctdb_ctrl_get_public_ips_flags(
ctdb, CONTROL_TIMEOUT(), CTDB_CURRENT_NODE, mem_ctx, 0, &ips);
if (ret != 0) {
DEBUG(DEBUG_ERR, ("Unable to retrieve known public IPs\n"));
talloc_free(mem_ctx);
return -1;
}
for (j=0; j<ips->num; j++) {
if (ips->ips[j].pnn == rec->pnn) {
if (!ctdb_sys_have_ip(&ips->ips[j].addr)) {
DEBUG(DEBUG_ERR,
("Assigned IP %s not on an interface\n",
ctdb_addr_to_str(&ips->ips[j].addr)));
need_takeover_run = true;
}
} else {
if (ctdb_sys_have_ip(&ips->ips[j].addr)) {
DEBUG(DEBUG_ERR,
("IP %s incorrectly on an interface\n",
ctdb_addr_to_str(&ips->ips[j].addr)));
need_takeover_run = true;
}
}
}
done:
if (need_takeover_run) {
struct ctdb_srvid_message rd;
TDB_DATA data;
DEBUG(DEBUG_NOTICE,("Trigger takeoverrun\n"));
ZERO_STRUCT(rd);
rd.pnn = rec->pnn;
rd.srvid = 0;
data.dptr = (uint8_t *)&rd;
data.dsize = sizeof(rd);
ret = ctdb_client_send_message(ctdb,
CTDB_BROADCAST_CONNECTED,
CTDB_SRVID_TAKEOVER_RUN,
data);
if (ret != 0) {
D_ERR("Failed to send takeover run request\n");
}
}
talloc_free(mem_ctx);
return 0;
}
struct remote_nodemaps_state {
struct ctdb_node_map_old **remote_nodemaps;
struct ctdb_recoverd *rec;
};
static void async_getnodemap_callback(struct ctdb_context *ctdb,
uint32_t node_pnn,
int32_t res,
TDB_DATA outdata,
void *callback_data)
{
struct remote_nodemaps_state *state =
(struct remote_nodemaps_state *)callback_data;
struct ctdb_node_map_old **remote_nodemaps = state->remote_nodemaps;
struct ctdb_node_map_old *nodemap = state->rec->nodemap;
size_t i;
for (i = 0; i < nodemap->num; i++) {
if (nodemap->nodes[i].pnn == node_pnn) {
break;
}
}
if (i >= nodemap->num) {
DBG_ERR("Invalid PNN %"PRIu32"\n", node_pnn);
return;
}
remote_nodemaps[i] = (struct ctdb_node_map_old *)talloc_steal(
remote_nodemaps, outdata.dptr);
}
static void async_getnodemap_error(struct ctdb_context *ctdb,
uint32_t node_pnn,
int32_t res,
TDB_DATA outdata,
void *callback_data)
{
struct remote_nodemaps_state *state =
(struct remote_nodemaps_state *)callback_data;
struct ctdb_recoverd *rec = state->rec;
DBG_ERR("Failed to retrieve nodemap from node %u\n", node_pnn);
ctdb_set_culprit(rec, node_pnn);
}
static int get_remote_nodemaps(struct ctdb_recoverd *rec,
TALLOC_CTX *mem_ctx,
struct ctdb_node_map_old ***remote_nodemaps)
{
struct ctdb_context *ctdb = rec->ctdb;
struct ctdb_node_map_old **t;
uint32_t *nodes;
struct remote_nodemaps_state state;
int ret;
t = talloc_zero_array(mem_ctx,
struct ctdb_node_map_old *,
rec->nodemap->num);
if (t == NULL) {
DBG_ERR("Memory allocation error\n");
return -1;
}
nodes = list_of_connected_nodes(ctdb, rec->nodemap, mem_ctx, false);
state.remote_nodemaps = t;
state.rec = rec;
ret = ctdb_client_async_control(ctdb,
CTDB_CONTROL_GET_NODEMAP,
nodes,
0,
CONTROL_TIMEOUT(),
false,
tdb_null,
async_getnodemap_callback,
async_getnodemap_error,
&state);
talloc_free(nodes);
if (ret != 0) {
talloc_free(t);
return ret;
}
*remote_nodemaps = t;
return 0;
}
static void main_loop(struct ctdb_context *ctdb, struct ctdb_recoverd *rec,
TALLOC_CTX *mem_ctx)
{
struct ctdb_node_map_old *nodemap=NULL;
struct ctdb_node_map_old **remote_nodemaps=NULL;
struct ctdb_vnn_map *vnnmap=NULL;
struct ctdb_vnn_map *remote_vnnmap=NULL;
uint32_t num_lmasters;
int32_t debug_level;
unsigned int i, j;
int ret;
bool self_ban;
/* verify that the main daemon is still running */
if (ctdb_kill(ctdb, ctdb->ctdbd_pid, 0) != 0) {
DEBUG(DEBUG_CRIT,("CTDB daemon is no longer available. Shutting down recovery daemon\n"));
exit(-1);
}
/* ping the local daemon to tell it we are alive */
ctdb_ctrl_recd_ping(ctdb);
if (rec->election_in_progress) {
/* an election is in progress */
return;
}
/*
* Start leader broadcasts if they are not active (1st time
* through main loop? Memory allocation error?)
*/
if (!leader_broadcast_loop_active(rec)) {
ret = leader_broadcast_loop(rec);
if (ret != 0) {
D_ERR("Failed to set up leader broadcast\n");
ctdb_set_culprit(rec, rec->pnn);
}
}
/*
* Similar for leader broadcast timeouts. These can also have
* been stopped by another node receiving a leader broadcast
* timeout and transmitting an "unknown leader broadcast".
* Note that this should never be done during an election - at
* the moment there is nothing between here and the above
* election-in-progress check that can process an election
* result (i.e. no event loop).
*/
if (!leader_broadcast_timeout_active(rec)) {
ret = leader_broadcast_timeout_start(rec);
if (ret != 0) {
ctdb_set_culprit(rec, rec->pnn);
}
}
/* read the debug level from the parent and update locally */
ret = ctdb_ctrl_get_debuglevel(ctdb, CTDB_CURRENT_NODE, &debug_level);
if (ret !=0) {
DEBUG(DEBUG_ERR, (__location__ " Failed to read debuglevel from parent\n"));
return;
}
debuglevel_set(debug_level);
/* get relevant tunables */
ret = ctdb_ctrl_get_all_tunables(ctdb, CONTROL_TIMEOUT(), CTDB_CURRENT_NODE, &ctdb->tunable);
if (ret != 0) {
DEBUG(DEBUG_ERR,("Failed to get tunables - retrying\n"));
return;
}
/* get runstate */
ret = ctdb_ctrl_get_runstate(ctdb, CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE, &ctdb->runstate);
if (ret != 0) {
DEBUG(DEBUG_ERR, ("Failed to get runstate - retrying\n"));
return;
}
/* get nodemap */
ret = ctdb_ctrl_getnodemap(ctdb,
CONTROL_TIMEOUT(),
rec->pnn,
rec,
&nodemap);
if (ret != 0) {
DBG_ERR("Unable to get nodemap from node %"PRIu32"\n", rec->pnn);
return;
}
talloc_free(rec->nodemap);
rec->nodemap = nodemap;
/* remember our own node flags */
rec->node_flags = nodemap->nodes[rec->pnn].flags;
ban_misbehaving_nodes(rec, &self_ban);
if (self_ban) {
DEBUG(DEBUG_NOTICE, ("This node was banned, restart main_loop\n"));
return;
}
ret = ctdb_ctrl_getrecmode(ctdb, mem_ctx, CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE, &ctdb->recovery_mode);
if (ret != 0) {
D_ERR("Failed to read recmode from local node\n");
return;
}
/* if the local daemon is STOPPED or BANNED, we verify that the databases are
also frozen and that the recmode is set to active.
*/
if (rec->node_flags & (NODE_FLAGS_STOPPED | NODE_FLAGS_BANNED)) {
/* If this node has become inactive then we want to
* reduce the chances of it taking over the leader
* role when it becomes active again. This
* helps to stabilise the leader role so that
* it stays on the most stable node.
*/
rec->priority_time = timeval_current();
if (ctdb->recovery_mode == CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_ERR,("Node is stopped or banned but recovery mode is not active. Activate recovery mode and lock databases\n"));
ret = ctdb_ctrl_setrecmode(ctdb, CONTROL_TIMEOUT(), CTDB_CURRENT_NODE, CTDB_RECOVERY_ACTIVE);
if (ret != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to activate recovery mode in STOPPED or BANNED state\n"));
return;
}
}
if (! rec->frozen_on_inactive) {
ret = ctdb_ctrl_freeze(ctdb, CONTROL_TIMEOUT(),
CTDB_CURRENT_NODE);
if (ret != 0) {
DEBUG(DEBUG_ERR,
(__location__ " Failed to freeze node "
"in STOPPED or BANNED state\n"));
return;
}
rec->frozen_on_inactive = true;
}
/* If this node is stopped or banned then it is not the recovery
* master, so don't do anything. This prevents stopped or banned
* node from starting election and sending unnecessary controls.
*/
return;
}
rec->frozen_on_inactive = false;
/* Retrieve capabilities from all connected nodes */
ret = update_capabilities(rec, nodemap);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " Unable to update node capabilities.\n"));
return;
}
if (ctdb->recovery_mode == CTDB_RECOVERY_NORMAL) {
/* Check if an IP takeover run is needed and trigger one if
* necessary */
verify_local_ip_allocation(rec);
}
/* If this node is not the leader then skip recovery checks */
if (!this_node_is_leader(rec)) {
return;
}
/* Get the nodemaps for all connected remote nodes */
ret = get_remote_nodemaps(rec, mem_ctx, &remote_nodemaps);
if (ret != 0) {
DBG_ERR("Failed to read remote nodemaps\n");
return;
}
/* Ensure our local and remote flags are correct */
ret = update_flags(rec, nodemap, remote_nodemaps);
if (ret != 0) {
D_ERR("Unable to update flags\n");
return;
}
if (ctdb->num_nodes != nodemap->num) {
DEBUG(DEBUG_ERR, (__location__ " ctdb->num_nodes (%d) != nodemap->num (%d) reloading nodes file\n", ctdb->num_nodes, nodemap->num));
ctdb_load_nodes_file(ctdb);
return;
}
/* verify that all active nodes agree that we are the recmaster */
switch (verify_recmaster(rec, nodemap, rec->pnn)) {
case MONITOR_RECOVERY_NEEDED:
/* can not happen */
return;
case MONITOR_ELECTION_NEEDED:
force_election(rec);
return;
case MONITOR_OK:
break;
case MONITOR_FAILED:
return;
}
/* get the vnnmap */
ret = ctdb_ctrl_getvnnmap(ctdb,
CONTROL_TIMEOUT(),
rec->pnn,
mem_ctx,
&vnnmap);
if (ret != 0) {
DBG_ERR("Unable to get vnnmap from node %u\n", rec->pnn);
return;
}
if (rec->need_recovery) {
/* a previous recovery didn't finish */
do_recovery(rec, mem_ctx);
return;
}
/* verify that all active nodes are in normal mode
and not in recovery mode
*/
switch (verify_recmode(ctdb, nodemap)) {
case MONITOR_RECOVERY_NEEDED:
do_recovery(rec, mem_ctx);
return;
case MONITOR_FAILED:
return;
case MONITOR_ELECTION_NEEDED:
/* can not happen */
case MONITOR_OK:
break;
}
if (ctdb->recovery_lock != NULL) {
/* We must already hold the recovery lock */
if (!ctdb_recovery_have_lock(rec)) {
DEBUG(DEBUG_ERR,("Failed recovery lock sanity check. Force a recovery\n"));
ctdb_set_culprit(rec, rec->pnn);
do_recovery(rec, mem_ctx);
return;
}
}
/* If recoveries are disabled then there is no use doing any
* nodemap or flags checks. Recoveries might be disabled due
* to "reloadnodes", so doing these checks might cause an
* unnecessary recovery. */
if (ctdb_op_is_disabled(rec->recovery)) {
goto takeover_run_checks;
}
/* verify that all other nodes have the same nodemap as we have
*/
for (j=0; j<nodemap->num; j++) {
if (nodemap->nodes[j].pnn == rec->pnn) {
continue;
}
if (nodemap->nodes[j].flags & NODE_FLAGS_INACTIVE) {
continue;
}
/* if the nodes disagree on how many nodes there are
then this is a good reason to try recovery
*/
if (remote_nodemaps[j]->num != nodemap->num) {
DEBUG(DEBUG_ERR, (__location__ " Remote node:%u has different node count. %u vs %u of the local node\n",
nodemap->nodes[j].pnn, remote_nodemaps[j]->num, nodemap->num));
ctdb_set_culprit(rec, nodemap->nodes[j].pnn);
do_recovery(rec, mem_ctx);
return;
}
/* if the nodes disagree on which nodes exist and are
active, then that is also a good reason to do recovery
*/
for (i=0;i<nodemap->num;i++) {
if (remote_nodemaps[j]->nodes[i].pnn != nodemap->nodes[i].pnn) {
DEBUG(DEBUG_ERR, (__location__ " Remote node:%u has different nodemap pnn for %d (%u vs %u).\n",
nodemap->nodes[j].pnn, i,
remote_nodemaps[j]->nodes[i].pnn, nodemap->nodes[i].pnn));
ctdb_set_culprit(rec, nodemap->nodes[j].pnn);
do_recovery(rec, mem_ctx);
return;
}
}
}
/* count how many active nodes there are */
num_lmasters = 0;
for (i=0; i<nodemap->num; i++) {
if (!(nodemap->nodes[i].flags & NODE_FLAGS_INACTIVE)) {
if (ctdb_node_has_capabilities(rec->caps,
ctdb->nodes[i]->pnn,
CTDB_CAP_LMASTER)) {
num_lmasters++;
}
}
}
/* There must be the same number of lmasters in the vnn map as
* there are active nodes with the lmaster capability... or
* do a recovery.
*/
if (vnnmap->size != num_lmasters) {
DEBUG(DEBUG_ERR, (__location__ " The vnnmap count is different from the number of active lmaster nodes: %u vs %u\n",
vnnmap->size, num_lmasters));
ctdb_set_culprit(rec, rec->pnn);
do_recovery(rec, mem_ctx);
return;
}
/*
* Verify that all active lmaster nodes in the nodemap also
* exist in the vnnmap
*/
for (j=0; j<nodemap->num; j++) {
if (nodemap->nodes[j].flags & NODE_FLAGS_INACTIVE) {
continue;
}
if (! ctdb_node_has_capabilities(rec->caps,
nodemap->nodes[j].pnn,
CTDB_CAP_LMASTER)) {
continue;
}
if (nodemap->nodes[j].pnn == rec->pnn) {
continue;
}
for (i=0; i<vnnmap->size; i++) {
if (vnnmap->map[i] == nodemap->nodes[j].pnn) {
break;
}
}
if (i == vnnmap->size) {
D_ERR("Active LMASTER node %u is not in the vnnmap\n",
nodemap->nodes[j].pnn);
ctdb_set_culprit(rec, nodemap->nodes[j].pnn);
do_recovery(rec, mem_ctx);
return;
}
}
/* verify that all other nodes have the same vnnmap
and are from the same generation
*/
for (j=0; j<nodemap->num; j++) {
if (nodemap->nodes[j].flags & NODE_FLAGS_INACTIVE) {
continue;
}
if (nodemap->nodes[j].pnn == rec->pnn) {
continue;
}
ret = ctdb_ctrl_getvnnmap(ctdb, CONTROL_TIMEOUT(), nodemap->nodes[j].pnn,
mem_ctx, &remote_vnnmap);
if (ret != 0) {
DEBUG(DEBUG_ERR, (__location__ " Unable to get vnnmap from remote node %u\n",
nodemap->nodes[j].pnn));
return;
}
/* verify the vnnmap generation is the same */
if (vnnmap->generation != remote_vnnmap->generation) {
DEBUG(DEBUG_ERR, (__location__ " Remote node %u has different generation of vnnmap. %u vs %u (ours)\n",
nodemap->nodes[j].pnn, remote_vnnmap->generation, vnnmap->generation));
ctdb_set_culprit(rec, nodemap->nodes[j].pnn);
do_recovery(rec, mem_ctx);
return;
}
/* verify the vnnmap size is the same */
if (vnnmap->size != remote_vnnmap->size) {
DEBUG(DEBUG_ERR, (__location__ " Remote node %u has different size of vnnmap. %u vs %u (ours)\n",
nodemap->nodes[j].pnn, remote_vnnmap->size, vnnmap->size));
ctdb_set_culprit(rec, nodemap->nodes[j].pnn);
do_recovery(rec, mem_ctx);
return;
}
/* verify the vnnmap is the same */
for (i=0;i<vnnmap->size;i++) {
if (remote_vnnmap->map[i] != vnnmap->map[i]) {
DEBUG(DEBUG_ERR, (__location__ " Remote node %u has different vnnmap.\n",
nodemap->nodes[j].pnn));
ctdb_set_culprit(rec, nodemap->nodes[j].pnn);
do_recovery(rec, mem_ctx);
return;
}
}
}
/* FIXME: Add remote public IP checking to ensure that nodes
* have the IP addresses that are allocated to them. */
takeover_run_checks:
/* If there are IP takeover runs requested or the previous one
* failed then perform one and notify the waiters */
if (!ctdb_op_is_disabled(rec->takeover_run) &&
(rec->reallocate_requests || rec->need_takeover_run)) {
process_ipreallocate_requests(ctdb, rec);
}
}
static void recd_sig_term_handler(struct tevent_context *ev,
struct tevent_signal *se, int signum,
int count, void *dont_care,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
DEBUG(DEBUG_ERR, ("Received SIGTERM, exiting\n"));
ctdb_recovery_unlock(rec);
exit(0);
}
/*
* Periodically log elements of the cluster state
*
* This can be used to confirm a split brain has occurred
*/
static void maybe_log_cluster_state(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval current_time,
void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
struct ctdb_context *ctdb = rec->ctdb;
struct tevent_timer *tt;
static struct timeval start_incomplete = {
.tv_sec = 0,
};
bool is_complete;
bool was_complete;
unsigned int i;
double seconds;
unsigned int minutes;
unsigned int num_connected;
if (!this_node_is_leader(rec)) {
goto done;
}
if (rec->nodemap == NULL) {
goto done;
}
is_complete = true;
num_connected = 0;
for (i = 0; i < rec->nodemap->num; i++) {
struct ctdb_node_and_flags *n = &rec->nodemap->nodes[i];
if (n->pnn == rec->pnn) {
continue;
}
if ((n->flags & NODE_FLAGS_DELETED) != 0) {
continue;
}
if ((n->flags & NODE_FLAGS_DISCONNECTED) != 0) {
is_complete = false;
continue;
}
num_connected++;
}
was_complete = timeval_is_zero(&start_incomplete);
if (is_complete) {
if (! was_complete) {
D_WARNING("Cluster complete with leader=%u\n",
rec->leader);
start_incomplete = timeval_zero();
}
goto done;
}
/* Cluster is newly incomplete... */
if (was_complete) {
start_incomplete = current_time;
minutes = 0;
goto log;
}
/*
* Cluster has been incomplete since previous check, so figure
* out how long (in minutes) and decide whether to log anything
*/
seconds = timeval_elapsed2(&start_incomplete, &current_time);
minutes = (unsigned int)seconds / 60;
if (minutes >= 60) {
/* Over an hour, log every hour */
if (minutes % 60 != 0) {
goto done;
}
} else if (minutes >= 10) {
/* Over 10 minutes, log every 10 minutes */
if (minutes % 10 != 0) {
goto done;
}
}
log:
D_WARNING("Cluster incomplete with leader=%u, elapsed=%u minutes, "
"connected=%u\n",
rec->leader,
minutes,
num_connected);
done:
tt = tevent_add_timer(ctdb->ev,
rec,
timeval_current_ofs(60, 0),
maybe_log_cluster_state,
rec);
if (tt == NULL) {
DBG_WARNING("Failed to set up cluster state timer\n");
}
}
static void recd_sighup_hook(void *private_data)
{
struct ctdb_recoverd *rec = talloc_get_type_abort(
private_data, struct ctdb_recoverd);
if (rec->helper_pid > 0) {
kill(rec->helper_pid, SIGHUP);
}
}
/*
the main monitoring loop
*/
static void monitor_cluster(struct ctdb_context *ctdb)
{
struct tevent_signal *se;
struct ctdb_recoverd *rec;
bool status;
DEBUG(DEBUG_NOTICE,("monitor_cluster starting\n"));
rec = talloc_zero(ctdb, struct ctdb_recoverd);
CTDB_NO_MEMORY_FATAL(ctdb, rec);
rec->ctdb = ctdb;
rec->leader = CTDB_UNKNOWN_PNN;
rec->pnn = ctdb_get_pnn(ctdb);
rec->recovery_lock_handle = NULL;
rec->leader_broadcast_timeout = LEADER_BROADCAST_TIMEOUT;
rec->helper_pid = -1;
rec->takeover_run = ctdb_op_init(rec, "takeover runs");
CTDB_NO_MEMORY_FATAL(ctdb, rec->takeover_run);
rec->recovery = ctdb_op_init(rec, "recoveries");
CTDB_NO_MEMORY_FATAL(ctdb, rec->recovery);
rec->priority_time = timeval_current();
rec->frozen_on_inactive = false;
status = logging_setup_sighup_handler(rec->ctdb->ev,
rec,
recd_sighup_hook,
rec);
if (!status) {
D_ERR("Failed to install SIGHUP handler\n");
exit(1);
}
se = tevent_add_signal(ctdb->ev, ctdb, SIGTERM, 0,
recd_sig_term_handler, rec);
if (se == NULL) {
DEBUG(DEBUG_ERR, ("Failed to install SIGTERM handler\n"));
exit(1);
}
if (ctdb->recovery_lock == NULL) {
struct tevent_timer *tt;
tt = tevent_add_timer(ctdb->ev,
rec,
timeval_current_ofs(60, 0),
maybe_log_cluster_state,
rec);
if (tt == NULL) {
DBG_WARNING("Failed to set up cluster state timer\n");
}
}
/* register a message port for sending memory dumps */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_MEM_DUMP, mem_dump_handler, rec);
/* when a node is assigned banning credits */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_BANNING,
banning_handler, rec);
/* register a message port for recovery elections */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_ELECTION, election_handler, rec);
ctdb_client_set_message_handler(ctdb,
CTDB_SRVID_SET_NODE_FLAGS,
srvid_not_implemented,
rec);
/* when we are asked to puch out a flag change */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_PUSH_NODE_FLAGS, push_flags_handler, rec);
/* register a message port for reloadnodes */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_RELOAD_NODES, reload_nodes_handler, rec);
/* register a message port for performing a takeover run */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_TAKEOVER_RUN, ip_reallocate_handler, rec);
/* register a message port for disabling the ip check for a short while */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_DISABLE_IP_CHECK, disable_ip_check_handler, rec);
/* register a message port for forcing a rebalance of a node next
reallocation */
ctdb_client_set_message_handler(ctdb, CTDB_SRVID_REBALANCE_NODE, recd_node_rebalance_handler, rec);
/* Register a message port for disabling takeover runs */
ctdb_client_set_message_handler(ctdb,
CTDB_SRVID_DISABLE_TAKEOVER_RUNS,
disable_takeover_runs_handler, rec);
/* Register a message port for disabling recoveries */
ctdb_client_set_message_handler(ctdb,
CTDB_SRVID_DISABLE_RECOVERIES,
disable_recoveries_handler, rec);
ctdb_client_set_message_handler(ctdb,
CTDB_SRVID_LEADER,
leader_handler,
rec);
for (;;) {
TALLOC_CTX *mem_ctx = talloc_new(ctdb);
struct timeval start;
double elapsed;
if (!mem_ctx) {
DEBUG(DEBUG_CRIT,(__location__
" Failed to create temp context\n"));
exit(-1);
}
start = timeval_current();
main_loop(ctdb, rec, mem_ctx);
talloc_free(mem_ctx);
/* we only check for recovery once every second */
elapsed = timeval_elapsed(&start);
if (elapsed < ctdb->tunable.recover_interval) {
ctdb_wait_timeout(ctdb, ctdb->tunable.recover_interval
- elapsed);
}
}
}
/*
event handler for when the main ctdbd dies
*/
static void ctdb_recoverd_parent(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
DEBUG(DEBUG_ALERT,("recovery daemon parent died - exiting\n"));
_exit(1);
}
/*
called regularly to verify that the recovery daemon is still running
*/
static void ctdb_check_recd(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval yt, void *p)
{
struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context);
if (ctdb_kill(ctdb, ctdb->recoverd_pid, 0) != 0) {
DEBUG(DEBUG_ERR,("Recovery daemon (pid:%d) is no longer running. Trying to restart recovery daemon.\n", (int)ctdb->recoverd_pid));
tevent_add_timer(ctdb->ev, ctdb, timeval_zero(),
ctdb_restart_recd, ctdb);
return;
}
tevent_add_timer(ctdb->ev, ctdb->recd_ctx,
timeval_current_ofs(30, 0),
ctdb_check_recd, ctdb);
}
static void recd_sig_child_handler(struct tevent_context *ev,
struct tevent_signal *se, int signum,
int count, void *dont_care,
void *private_data)
{
// struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
int status;
pid_t pid = -1;
while (pid != 0) {
pid = waitpid(-1, &status, WNOHANG);
if (pid == -1) {
if (errno != ECHILD) {
DEBUG(DEBUG_ERR, (__location__ " waitpid() returned error. errno:%s(%d)\n", strerror(errno),errno));
}
return;
}
if (pid > 0) {
DEBUG(DEBUG_DEBUG, ("RECD SIGCHLD from %d\n", (int)pid));
}
}
}
/*
startup the recovery daemon as a child of the main ctdb daemon
*/
int ctdb_start_recoverd(struct ctdb_context *ctdb)
{
int fd[2];
struct tevent_signal *se;
struct tevent_fd *fde;
int ret;
if (pipe(fd) != 0) {
return -1;
}
ctdb->recoverd_pid = ctdb_fork(ctdb);
if (ctdb->recoverd_pid == -1) {
return -1;
}
if (ctdb->recoverd_pid != 0) {
talloc_free(ctdb->recd_ctx);
ctdb->recd_ctx = talloc_new(ctdb);
CTDB_NO_MEMORY(ctdb, ctdb->recd_ctx);
close(fd[0]);
tevent_add_timer(ctdb->ev, ctdb->recd_ctx,
timeval_current_ofs(30, 0),
ctdb_check_recd, ctdb);
return 0;
}
close(fd[1]);
srandom(getpid() ^ time(NULL));
ret = logging_init(ctdb, NULL, NULL, "ctdb-recoverd");
if (ret != 0) {
return -1;
}
prctl_set_comment("ctdb_recoverd");
if (switch_from_server_to_client(ctdb) != 0) {
DEBUG(DEBUG_CRIT, (__location__ "ERROR: failed to switch recovery daemon into client mode. shutting down.\n"));
exit(1);
}
DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d to recovery daemon\n", fd[0]));
fde = tevent_add_fd(ctdb->ev, ctdb, fd[0], TEVENT_FD_READ,
ctdb_recoverd_parent, &fd[0]);
tevent_fd_set_auto_close(fde);
/* set up a handler to pick up sigchld */
se = tevent_add_signal(ctdb->ev, ctdb, SIGCHLD, 0,
recd_sig_child_handler, ctdb);
if (se == NULL) {
DEBUG(DEBUG_CRIT,("Failed to set up signal handler for SIGCHLD in recovery daemon\n"));
exit(1);
}
monitor_cluster(ctdb);
DEBUG(DEBUG_ALERT,("ERROR: ctdb_recoverd finished!?\n"));
return -1;
}
/*
shutdown the recovery daemon
*/
void ctdb_stop_recoverd(struct ctdb_context *ctdb)
{
if (ctdb->recoverd_pid == 0) {
return;
}
DEBUG(DEBUG_NOTICE,("Shutting down recovery daemon\n"));
ctdb_kill(ctdb, ctdb->recoverd_pid, SIGTERM);
TALLOC_FREE(ctdb->recd_ctx);
TALLOC_FREE(ctdb->recd_ping_count);
}
static void ctdb_restart_recd(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *private_data)
{
struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
DEBUG(DEBUG_ERR,("Restarting recovery daemon\n"));
ctdb_stop_recoverd(ctdb);
ctdb_start_recoverd(ctdb);
}
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