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- Updating cluster log with latest code changes/bug fixes before

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altering to new kernel structures.
This commit is contained in:
Jonathan Earl Brassow 2009-04-21 19:16:22 +00:00
parent 5800560602
commit ceeb1eca9d
4 changed files with 266 additions and 112 deletions
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18
daemons/clogd/clogd.c
View File

@ -31,7 +31,6 @@ static void process_signals(void);
static void daemonize(void);
static void init_all(void);
static void cleanup_all(void);
static void set_priority(void);
int main(int argc, char *argv[])
{
@ -42,8 +41,6 @@ int main(int argc, char *argv[])
/* Parent can now exit, we're ready to handle requests */
kill(getppid(), SIGTERM);
/* set_priority(); -- let's try to do w/o this */
LOG_PRINT("Starting clogd:");
LOG_PRINT(" Built: "__DATE__" "__TIME__"\n");
LOG_DBG(" Compiled with debugging.");
@ -266,18 +263,3 @@ static void cleanup_all(void)
cleanup_local();
cleanup_cluster();
}
static void set_priority(void)
{
struct sched_param sched_param;
int res;
res = sched_get_priority_max(SCHED_RR);
if (res != -1) {
sched_param.sched_priority = res;
res = sched_setscheduler(0, SCHED_RR, &sched_param);
}
if (res == -1)
LOG_ERROR("Unable to set SCHED_RR priority.");
}

252
daemons/clogd/cluster.c
View File

@ -68,9 +68,14 @@ static SaCkptHandleT ckpt_handle = 0;
static SaCkptCallbacksT callbacks = { 0, 0 };
static SaVersionT version = { 'B', 1, 1 };
#define DEBUGGING_HISTORY 50
#define DEBUGGING_HISTORY 100
static char debugging[DEBUGGING_HISTORY][128];
static int idx = 0;
#define LOG_SPRINT(f, arg...) do {\
idx++; \
idx = idx % DEBUGGING_HISTORY; \
sprintf(debugging[idx], f, ## arg); \
} while (0)
static int log_resp_rec = 0;
@ -213,8 +218,17 @@ static int handle_cluster_request(struct clog_cpg *entry,
* a cluster action to co-ordinate reading
* the disk and checkpointing
*/
if ((t->request_type != DM_CLOG_RESUME) ||
(t->originator == my_cluster_id))
if (t->request_type == DM_CLOG_RESUME) {
if (t->originator == my_cluster_id) {
r = do_request(t, server);
r = kernel_send(t);
if (r < 0)
LOG_ERROR("Failed to send resume response to kernel");
}
return r;
}
r = do_request(t, server);
if (server &&
@ -337,7 +351,7 @@ static struct checkpoint_data *prepare_checkpoint(struct clog_cpg *entry,
strncpy(new->uuid, entry->name.value, entry->name.length);
new->bitmap_size = push_state(entry->name.value, "clean_bits",
&new->clean_bits);
&new->clean_bits, cp_requester);
if (new->bitmap_size <= 0) {
LOG_ERROR("Failed to store clean_bits to checkpoint for node %u",
new->requester);
@ -346,7 +360,7 @@ static struct checkpoint_data *prepare_checkpoint(struct clog_cpg *entry,
}
new->bitmap_size = push_state(entry->name.value,
"sync_bits", &new->sync_bits);
"sync_bits", &new->sync_bits, cp_requester);
if (new->bitmap_size <= 0) {
LOG_ERROR("Failed to store sync_bits to checkpoint for node %u",
new->requester);
@ -355,7 +369,7 @@ static struct checkpoint_data *prepare_checkpoint(struct clog_cpg *entry,
return NULL;
}
r = push_state(entry->name.value, "recovering_region", &new->recovering_region);
r = push_state(entry->name.value, "recovering_region", &new->recovering_region, cp_requester);
if (r <= 0) {
LOG_ERROR("Failed to store recovering_region to checkpoint for node %u",
new->requester);
@ -541,6 +555,7 @@ rr_create_retry:
tfr->request_type = DM_CLOG_CHECKPOINT_READY;
tfr->originator = cp->requester; /* FIXME: hack to overload meaning of originator */
strncpy(tfr->uuid, cp->uuid, CPG_MAX_NAME_LENGTH);
tfr->seq = my_cluster_id;
r = cluster_send(tfr);
if (r)
@ -704,15 +719,11 @@ no_read:
return rtn;
}
static void do_checkpoints(struct clog_cpg *entry)
static void do_checkpoints(struct clog_cpg *entry, int leaving)
{
struct checkpoint_data *cp;
for (cp = entry->checkpoint_list; cp;) {
LOG_COND(log_checkpoint,
"[%s] Checkpoint data available for node %u",
SHORT_UUID(entry->name.value), cp->requester);
/*
* FIXME: Check return code. Could send failure
* notice in tfr in export_checkpoint function
@ -720,18 +731,34 @@ static void do_checkpoints(struct clog_cpg *entry)
*/
switch (export_checkpoint(cp)) {
case -EEXIST:
LOG_SPRINT("[%s] Checkpoint for %u already handled%s",
SHORT_UUID(entry->name.value), cp->requester,
(leaving) ? "(L)": "");
LOG_COND(log_checkpoint,
"[%s] Checkpoint for %u already handled",
SHORT_UUID(entry->name.value), cp->requester);
"[%s] Checkpoint for %u already handled%s",
SHORT_UUID(entry->name.value), cp->requester,
(leaving) ? "(L)": "");
entry->checkpoint_list = cp->next;
free_checkpoint(cp);
cp = entry->checkpoint_list;
break;
case 0:
LOG_SPRINT("[%s] Checkpoint data available for node %u%s",
SHORT_UUID(entry->name.value), cp->requester,
(leaving) ? "(L)": "");
LOG_COND(log_checkpoint,
"[%s] Checkpoint data available for node %u%s",
SHORT_UUID(entry->name.value), cp->requester,
(leaving) ? "(L)": "");
entry->checkpoint_list = cp->next;
free_checkpoint(cp);
cp = entry->checkpoint_list;
break;
default:
/* FIXME: Skipping will cause list corruption */
LOG_ERROR("[%s] Failed to export checkpoint for %u",
SHORT_UUID(entry->name.value), cp->requester);
LOG_ERROR("[%s] Failed to export checkpoint for %u%s",
SHORT_UUID(entry->name.value), cp->requester,
(leaving) ? "(L)": "");
}
}
}
@ -763,8 +790,6 @@ static int resend_requests(struct clog_cpg *entry)
}
switch (tfr->request_type) {
case DM_CLOG_RESUME:
/* We are only concerned about this request locally */
case DM_CLOG_SET_REGION_SYNC:
/*
* Some requests simply do not need to be resent.
@ -776,11 +801,10 @@ static int resend_requests(struct clog_cpg *entry)
"[%s] Skipping resend of %s/#%u...",
SHORT_UUID(entry->name.value),
_RQ_TYPE(tfr->request_type), tfr->seq);
idx++;
idx = idx % DEBUGGING_HISTORY;
sprintf(debugging[idx], "### No resend: [%s] %s/%u ###",
SHORT_UUID(entry->name.value), _RQ_TYPE(tfr->request_type),
tfr->seq);
LOG_SPRINT("### No resend: [%s] %s/%u ###",
SHORT_UUID(entry->name.value),
_RQ_TYPE(tfr->request_type), tfr->seq);
tfr->data_size = 0;
kernel_send(tfr);
@ -796,11 +820,9 @@ static int resend_requests(struct clog_cpg *entry)
SHORT_UUID(entry->name.value),
_RQ_TYPE(tfr->request_type),
tfr->seq, entry->lowest_id);
idx++;
idx = idx % DEBUGGING_HISTORY;
sprintf(debugging[idx], "*** Resending: [%s] %s/%u ***",
SHORT_UUID(entry->name.value), _RQ_TYPE(tfr->request_type),
tfr->seq);
LOG_SPRINT("*** Resending: [%s] %s/%u ***",
SHORT_UUID(entry->name.value),
_RQ_TYPE(tfr->request_type), tfr->seq);
r = cluster_send(tfr);
if (r < 0)
LOG_ERROR("Failed resend");
@ -825,7 +847,7 @@ static int do_cluster_work(void *data)
free(entry);
continue;
}
do_checkpoints(entry);
do_checkpoints(entry, 0);
resend_requests(entry);
}
@ -858,6 +880,8 @@ static int flush_startup_list(struct clog_cpg *entry)
free(tfr);
continue;
}
LOG_SPRINT("[%s] Checkpoint prepared for %u",
SHORT_UUID(entry->name.value), tfr->originator);
LOG_COND(log_checkpoint, "[%s] Checkpoint prepared for %u",
SHORT_UUID(entry->name.value), tfr->originator);
new->next = entry->checkpoint_list;
@ -878,6 +902,7 @@ static int flush_startup_list(struct clog_cpg *entry)
}
free(tfr);
}
return 0;
}
@ -901,6 +926,7 @@ static void cpg_message_callback(cpg_handle_t handle, struct cpg_name *gname,
if ((nodeid == my_cluster_id) &&
!(tfr->request_type & DM_CLOG_RESPONSE) &&
(tfr->request_type != DM_CLOG_RESUME) &&
(tfr->request_type != DM_CLOG_CLEAR_REGION) &&
(tfr->request_type != DM_CLOG_CHECKPOINT_READY)) {
tmp_tfr = malloc(DM_CLOG_TFR_SIZE);
@ -915,6 +941,7 @@ static void cpg_message_callback(cpg_handle_t handle, struct cpg_name *gname,
return;
}
memcpy(tmp_tfr, tfr, sizeof(*tfr) + tfr->data_size);
INIT_LIST_HEAD((struct list_head *)&tmp_tfr->private);
list_add_tail((struct list_head *)&tmp_tfr->private, &match->working_list);
}
@ -952,6 +979,7 @@ static void cpg_message_callback(cpg_handle_t handle, struct cpg_name *gname,
LOG_COND(log_resend_requests, "[%s] %u is leaving, delay = %d",
SHORT_UUID(tfr->uuid), nodeid, match->delay);
}
tfr->originator = nodeid; /* don't really need this, but nice for debug */
goto out;
}
}
@ -969,45 +997,33 @@ static void cpg_message_callback(cpg_handle_t handle, struct cpg_name *gname,
if (tfr->request_type == DM_CLOG_CHECKPOINT_READY) {
if (my_cluster_id == tfr->originator) {
/* Redundant checkpoints ignored if match->valid */
LOG_SPRINT("[%s] CHECKPOINT_READY notification from %u",
SHORT_UUID(tfr->uuid), nodeid);
if (import_checkpoint(match, (match->state != INVALID))) {
LOG_SPRINT("[%s] Failed to import checkpoint from %u",
SHORT_UUID(tfr->uuid), nodeid);
LOG_ERROR("[%s] Failed to import checkpoint from %u",
SHORT_UUID(tfr->uuid), nodeid);
kill(getpid(), SIGUSR1);
/* Could we retry? */
goto out;
} else if (match->state == INVALID) {
LOG_SPRINT("[%s] Checkpoint data received from %u. Log is now valid",
SHORT_UUID(match->name.value), nodeid);
LOG_COND(log_checkpoint,
"[%s] Checkpoint data received from %u. Log is now valid",
SHORT_UUID(match->name.value), nodeid);
match->state = VALID;
flush_startup_list(match);
} else {
LOG_SPRINT("[%s] Redundant checkpoint from %u ignored.",
SHORT_UUID(tfr->uuid), nodeid);
}
}
goto out;
}
/*
* If the log is now valid, we can queue the checkpoints
*/
for (i = match->checkpoints_needed; i; ) {
struct checkpoint_data *new;
i--;
new = prepare_checkpoint(match, match->checkpoint_requesters[i]);
if (!new) {
/* FIXME: Need better error handling */
LOG_ERROR("[%s] Failed to prepare checkpoint for %u!!!",
SHORT_UUID(tfr->uuid), match->checkpoint_requesters[i]);
break;
}
LOG_COND(log_checkpoint, "[%s] Checkpoint prepared for %u*",
SHORT_UUID(tfr->uuid), match->checkpoint_requesters[i]);
match->checkpoints_needed--;
new->next = match->checkpoint_list;
match->checkpoint_list = new;
}
if (tfr->request_type & DM_CLOG_RESPONSE) {
response = 1;
r = handle_cluster_response(match, tfr);
@ -1033,6 +1049,7 @@ static void cpg_message_callback(cpg_handle_t handle, struct cpg_name *gname,
memcpy(tmp_tfr, tfr, sizeof(*tfr) + tfr->data_size);
tmp_tfr->error = match->lowest_id;
INIT_LIST_HEAD((struct list_head *)&tmp_tfr->private);
list_add_tail((struct list_head *)&tmp_tfr->private,
&match->startup_list);
goto out;
@ -1041,6 +1058,37 @@ static void cpg_message_callback(cpg_handle_t handle, struct cpg_name *gname,
r = handle_cluster_request(match, tfr, i_am_server);
}
/*
* If the log is now valid, we can queue the checkpoints
*/
for (i = match->checkpoints_needed; i; ) {
struct checkpoint_data *new;
if (log_get_state(tfr) != LOG_RESUMED) {
LOG_DBG("[%s] Withholding checkpoints until log is valid (%s from %u)",
SHORT_UUID(tfr->uuid), _RQ_TYPE(tfr->request_type), nodeid);
break;
}
i--;
new = prepare_checkpoint(match, match->checkpoint_requesters[i]);
if (!new) {
/* FIXME: Need better error handling */
LOG_ERROR("[%s] Failed to prepare checkpoint for %u!!!",
SHORT_UUID(tfr->uuid), match->checkpoint_requesters[i]);
break;
}
LOG_SPRINT("[%s] Checkpoint prepared for %u* (%s)",
SHORT_UUID(tfr->uuid), match->checkpoint_requesters[i],
(log_get_state(tfr) != LOG_RESUMED)? "LOG_RESUMED": "LOG_SUSPENDED");
LOG_COND(log_checkpoint, "[%s] Checkpoint prepared for %u*",
SHORT_UUID(tfr->uuid), match->checkpoint_requesters[i]);
match->checkpoints_needed--;
new->next = match->checkpoint_list;
match->checkpoint_list = new;
}
out:
/* nothing happens after this point. It is just for debugging */
if (r) {
@ -1066,17 +1114,17 @@ out:
}
} else if (!(tfr->request_type & DM_CLOG_RESPONSE) ||
(tfr->originator == my_cluster_id)) {
int len;
idx++;
idx = idx % DEBUGGING_HISTORY;
len = sprintf(debugging[idx],
"SEQ#=%u, UUID=%s, TYPE=%s, ORIG=%u, RESP=%s",
tfr->seq,
SHORT_UUID(tfr->uuid),
if (!response)
LOG_SPRINT("SEQ#=%u, UUID=%s, TYPE=%s, ORIG=%u, RESP=%s",
tfr->seq, SHORT_UUID(tfr->uuid),
_RQ_TYPE(tfr->request_type),
tfr->originator, (response) ? "YES" : "NO");
if (response)
sprintf(debugging[idx] + len, ", RSPR=%u", nodeid);
else
LOG_SPRINT("SEQ#=%u, UUID=%s, TYPE=%s, ORIG=%u, RESP=%s, RSPR=%u",
tfr->seq, SHORT_UUID(tfr->uuid),
_RQ_TYPE(tfr->request_type),
tfr->originator, (response) ? "YES" : "NO",
nodeid);
}
}
@ -1089,6 +1137,7 @@ static void cpg_join_callback(struct clog_cpg *match,
int my_pid = getpid();
uint32_t lowest = match->lowest_id;
struct clog_tfr *tfr;
char dbuf[32];
/* Assign my_cluster_id */
if ((my_cluster_id == 0xDEAD) && (joined->pid == my_pid))
@ -1104,8 +1153,12 @@ static void cpg_join_callback(struct clog_cpg *match,
if (joined->nodeid == my_cluster_id)
goto out;
LOG_COND(log_checkpoint, "[%s] Joining node, %u needs checkpoint",
SHORT_UUID(match->name.value), joined->nodeid);
memset(dbuf, 0, sizeof(dbuf));
for (i = 0; i < (member_list_entries-1); i++)
sprintf(dbuf+strlen(dbuf), "%u-", member_list[i].nodeid);
sprintf(dbuf+strlen(dbuf), "(%u)", joined->nodeid);
LOG_COND(log_checkpoint, "[%s] Joining node, %u needs checkpoint [%s]",
SHORT_UUID(match->name.value), joined->nodeid, dbuf);
/*
* FIXME: remove checkpoint_requesters/checkpoints_needed, and use
@ -1127,6 +1180,7 @@ static void cpg_join_callback(struct clog_cpg *match,
}
tfr->request_type = DM_CLOG_MEMBER_JOIN;
tfr->originator = joined->nodeid;
INIT_LIST_HEAD((struct list_head *)&tfr->private);
list_add_tail((struct list_head *)&tfr->private, &match->startup_list);
out:
@ -1149,9 +1203,7 @@ out:
LOG_COND(log_membership_change, "[%s] Server unchanged at %u (%u joined)",
SHORT_UUID(match->name.value),
lowest, joined->nodeid);
idx++;
idx = idx % DEBUGGING_HISTORY;
sprintf(debugging[idx], "+++ UUID=%s %u join +++",
LOG_SPRINT("+++ UUID=%s %u join +++",
SHORT_UUID(match->name.value), joined->nodeid);
}
@ -1160,17 +1212,14 @@ static void cpg_leave_callback(struct clog_cpg *match,
struct cpg_address *member_list,
int member_list_entries)
{
int i, fd;
int i, j, fd;
struct list_head *p, *n;
uint32_t lowest = match->lowest_id;
struct clog_tfr *tfr;
struct checkpoint_data *p_cp, *c_cp;
{
idx++;
idx = idx % DEBUGGING_HISTORY;
sprintf(debugging[idx], "--- UUID=%s %u left ---",
LOG_SPRINT("--- UUID=%s %u left ---",
SHORT_UUID(match->name.value), left->nodeid);
}
/* Am I leaving? */
if (my_cluster_id == left->nodeid) {
@ -1198,6 +1247,42 @@ static void cpg_leave_callback(struct clog_cpg *match,
match->state = INVALID;
}
/* Remove any pending checkpoints for the leaving node. */
for (p_cp = NULL, c_cp = match->checkpoint_list;
c_cp && (c_cp->requester != left->nodeid);
p_cp = c_cp, c_cp = c_cp->next);
if (c_cp) {
if (p_cp)
p_cp->next = c_cp->next;
else
match->checkpoint_list = c_cp->next;
LOG_COND(log_checkpoint,
"[%s] Removing pending checkpoint (%u is leaving)",
SHORT_UUID(match->name.value), left->nodeid);
free_checkpoint(c_cp);
}
list_for_each_safe(p, n, &match->startup_list) {
tfr = (struct clog_tfr *)p;
if ((tfr->request_type == DM_CLOG_MEMBER_JOIN) &&
(tfr->originator == left->nodeid)) {
LOG_COND(log_checkpoint,
"[%s] Removing pending ckpt from startup list (%u is leaving)",
SHORT_UUID(match->name.value), left->nodeid);
list_del_init(p);
free(tfr);
}
}
for (i = 0, j = 0; i < match->checkpoints_needed; i++, j++) {
match->checkpoint_requesters[j] = match->checkpoint_requesters[i];
if (match->checkpoint_requesters[i] == left->nodeid) {
LOG_ERROR("[%s] Removing pending ckpt from needed list (%u is leaving)",
SHORT_UUID(match->name.value), left->nodeid);
j--;
}
}
match->checkpoints_needed = j;
if (left->nodeid < my_cluster_id) {
match->delay = (match->delay > 0) ? match->delay - 1 : 0;
if (!match->delay && list_empty(&match->working_list))
@ -1379,9 +1464,7 @@ int create_cluster_cpg(char *str)
new->name.length = size;
/*
* Look for checkpoints before joining to see if
* someone wrote a checkpoint after I left a previous
* session.
* Ensure there are no stale checkpoints around before we join
*/
if (remove_checkpoint(new) == 1)
LOG_COND(log_checkpoint,
@ -1437,6 +1520,7 @@ static void abort_startup(struct clog_cpg *del)
static int _destroy_cluster_cpg(struct clog_cpg *del)
{
int r;
int state;
LOG_COND(log_resend_requests, "[%s] I am leaving.2.....",
SHORT_UUID(del->name.value));
@ -1445,13 +1529,27 @@ static int _destroy_cluster_cpg(struct clog_cpg *del)
* We must send any left over checkpoints before
* leaving. If we don't, an incoming node could
* be stuck with no checkpoint and stall.
do_checkpoints(del); --- THIS COULD BE CAUSING OUR PROBLEMS:
- Incoming node deletes old checkpoints before joining
- A stale checkpoint is issued here by leaving node
- (leaving node leaves)
- Incoming node joins cluster and finds stale checkpoint.
- (leaving node leaves - option 2)
*/
do_checkpoints(del);
do_checkpoints(del, 1);
state = del->state;
del->cpg_state = INVALID;
del->state = LEAVING;
if (!list_empty(&del->startup_list))
/*
* If the state is VALID, we might be processing the
* startup list. If so, we certainly don't want to
* clear the startup_list here by calling abort_startup
*/
if (!list_empty(&del->startup_list) && (state != VALID))
abort_startup(del);
r = cpg_leave(del->handle, &del->name);
@ -1473,13 +1571,11 @@ int destroy_cluster_cpg(char *str)
int init_cluster(void)
{
int i;
SaAisErrorT rv;
{
int i;
for (i = 0; i < DEBUGGING_HISTORY; i++)
debugging[i][0] = '\0';
}
INIT_LIST_HEAD(&clog_cpg_list);
rv = saCkptInitialize(&ckpt_handle, &callbacks, &version);

90
daemons/clogd/functions.c
View File

@ -11,6 +11,7 @@
#include <linux/kdev_t.h>
#define __USE_GNU /* for O_DIRECT */
#include <fcntl.h>
#include <time.h>
#include "linux/dm-clog-tfr.h"
#include "list.h"
#include "functions.h"
@ -50,6 +51,7 @@ struct log_c {
char uuid[DM_UUID_LEN];
uint32_t ref_count;
time_t delay; /* limits how fast a resume can happen after suspend */
int touched;
uint32_t region_size;
uint32_t region_count;
@ -60,6 +62,7 @@ struct log_c {
uint32_t *sync_bits;
uint32_t recoverer;
uint64_t recovering_region; /* -1 means not recovering */
uint64_t skip_bit_warning; /* used to warn if region skipped */
int sync_search;
int resume_override;
@ -429,6 +432,7 @@ static int _clog_ctr(int argc, char **argv, uint64_t device_size)
lc->block_on_error = block_on_error;
lc->sync_search = 0;
lc->recovering_region = (uint64_t)-1;
lc->skip_bit_warning = region_count;
lc->disk_fd = -1;
lc->log_dev_failed = 0;
lc->ref_count = 1;
@ -645,7 +649,6 @@ static int clog_presuspend(struct clog_tfr *tfr)
if (lc->touched)
LOG_DBG("WARNING: log still marked as 'touched' during suspend");
lc->state = LOG_SUSPENDED;
lc->recovery_halted = 1;
return 0;
@ -666,8 +669,10 @@ static int clog_postsuspend(struct clog_tfr *tfr)
LOG_DBG("[%s] clog_postsuspend: leaving CPG", SHORT_UUID(lc->uuid));
destroy_cluster_cpg(tfr->uuid);
lc->state = LOG_SUSPENDED;
lc->recovering_region = (uint64_t)-1;
lc->recoverer = (uint32_t)-1;
lc->delay = time(NULL);
return 0;
}
@ -714,6 +719,9 @@ static int clog_resume(struct clog_tfr *tfr)
case 1000:
LOG_ERROR("[%s] Additional resume issued before suspend",
SHORT_UUID(tfr->uuid));
#ifdef DEBUG
kill(getpid(), SIGUSR1);
#endif
return 0;
case 0:
lc->resume_override = 1000;
@ -806,7 +814,7 @@ out:
lc->sync_count = count_bits32(lc->sync_bits, lc->bitset_uint32_count);
LOG_DBG("[%s] Initial sync_count = %llu",
LOG_SPRINT("[%s] Initial sync_count = %llu",
SHORT_UUID(lc->uuid), (unsigned long long)lc->sync_count);
lc->sync_search = 0;
lc->state = LOG_RESUMED;
@ -826,6 +834,7 @@ out:
int local_resume(struct clog_tfr *tfr)
{
int r;
time_t t;
struct log_c *lc = get_log(tfr->uuid);
if (!lc) {
@ -836,6 +845,34 @@ int local_resume(struct clog_tfr *tfr)
return -EINVAL;
}
t = time(NULL);
t -= lc->delay;
/*
* This should be considered a temporary fix. It addresses
* a problem that exists when nodes suspend/resume in rapid
* succession. While the problem is very rare, it has been
* seen to happen in real-world-like testing.
*
* The problem:
* - Node A joins cluster
* - Node B joins cluster
* - Node A prepares checkpoint
* - Node A gets ready to write checkpoint
* - Node B leaves
* - Node B joins
* - Node A finishes write of checkpoint
* - Node B receives checkpoint meant for previous session
* -- Node B can now be non-coherent
*
* This timer will solve the problem for now, but could be
* replaced by a generation number sent with the resume
* command from the kernel. The generation number would
* be included in the name of the checkpoint to prevent
* reading stale data.
*/
if ((t < 3) && (t >= 0))
sleep(3 - t);
/* Join the CPG */
r = create_cluster_cpg(tfr->uuid);
if (r) {
@ -1155,6 +1192,7 @@ static int clog_get_resync_work(struct clog_tfr *tfr)
(unsigned long long)lc->recovering_region);
pkg->r = lc->recovering_region;
pkg->i = 1;
LOG_COND(log_resend_requests, "***** RE-REQUEST *****");
} else {
LOG_SPRINT("GET - SEQ#=%u, UUID=%s, nodeid = %u:: "
"Someone already recovering (%llu)",
@ -1233,10 +1271,30 @@ static int clog_set_region_sync(struct clog_tfr *tfr)
} else {
log_set_bit(lc, lc->sync_bits, pkg->region);
lc->sync_count++;
/* The rest of this section is all for debugging */
LOG_SPRINT("SET - SEQ#=%u, UUID=%s, nodeid = %u:: "
"Setting region (%llu)",
tfr->seq, SHORT_UUID(lc->uuid), tfr->originator,
(unsigned long long)pkg->region);
if (pkg->region == lc->skip_bit_warning)
lc->skip_bit_warning = lc->region_count;
if (pkg->region > (lc->skip_bit_warning + 5)) {
LOG_ERROR("*** Region #%llu skipped during recovery ***",
(unsigned long long)lc->skip_bit_warning);
lc->skip_bit_warning = lc->region_count;
#ifdef DEBUG
kill(getpid(), SIGUSR1);
#endif
}
if (!log_test_bit(lc->sync_bits,
(pkg->region) ? pkg->region - 1 : 0)) {
LOG_SPRINT("*** Previous bit not set ***");
lc->skip_bit_warning = (pkg->region) ?
pkg->region - 1 : 0;
}
}
} else if (log_test_bit(lc->sync_bits, pkg->region)) {
lc->sync_count--;
@ -1254,6 +1312,9 @@ static int clog_set_region_sync(struct clog_tfr *tfr)
"sync_count(%llu) != bitmap count(%llu)",
tfr->seq, SHORT_UUID(lc->uuid), tfr->originator,
(unsigned long long)lc->sync_count, reset);
#ifdef DEBUG
kill(getpid(), SIGUSR1);
#endif
lc->sync_count = reset;
}
@ -1291,6 +1352,19 @@ static int clog_get_sync_count(struct clog_tfr *tfr)
tfr->data_size = sizeof(*sync_count);
if (lc->sync_count != count_bits32(lc->sync_bits, lc->bitset_uint32_count)) {
unsigned long long reset = count_bits32(lc->sync_bits, lc->bitset_uint32_count);
LOG_SPRINT("get_sync_count - SEQ#=%u, UUID=%s, nodeid = %u:: "
"sync_count(%llu) != bitmap count(%llu)",
tfr->seq, SHORT_UUID(lc->uuid), tfr->originator,
(unsigned long long)lc->sync_count, reset);
#ifdef DEBUG
kill(getpid(), SIGUSR1);
#endif
lc->sync_count = reset;
}
return 0;
}
@ -1593,7 +1667,7 @@ static void print_bits(char *buf, int size, int print)
}
/* int store_bits(const char *uuid, const char *which, char **buf)*/
int push_state(const char *uuid, const char *which, char **buf)
int push_state(const char *uuid, const char *which, char **buf, uint32_t debug_who)
{
int bitset_size;
struct log_c *lc;
@ -1614,10 +1688,12 @@ int push_state(const char *uuid, const char *which, char **buf)
sprintf(*buf, "%llu %u", (unsigned long long)lc->recovering_region,
lc->recoverer);
LOG_SPRINT("CKPT SEND - SEQ#=X, UUID=%s, nodeid = X:: "
"recovering_region=%llu, recoverer=%u",
SHORT_UUID(lc->uuid),
(unsigned long long)lc->recovering_region, lc->recoverer);
LOG_SPRINT("CKPT SEND - SEQ#=X, UUID=%s, nodeid = %u:: "
"recovering_region=%llu, recoverer=%u, sync_count=%llu",
SHORT_UUID(lc->uuid), debug_who,
(unsigned long long)lc->recovering_region,
lc->recoverer,
(unsigned long long)count_bits32(lc->sync_bits, lc->bitset_uint32_count));
return 64;
}

2
daemons/clogd/functions.h
View File

@ -10,7 +10,7 @@ int local_resume(struct clog_tfr *tfr);
int cluster_postsuspend(char *);
int do_request(struct clog_tfr *tfr, int server);
int push_state(const char *uuid, const char *which, char **buf);
int push_state(const char *uuid, const char *which, char **buf, uint32_t debug_who);
int pull_state(const char *uuid, const char *which, char *buf, int size);
int log_get_state(struct clog_tfr *tfr);