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phys_rep_lsn.c
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phys_rep_lsn.c
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#include <build/db.h>
#include <strings.h>
#include <logmsg.h>
#include <string.h>
#include "bdb_int.h"
#include <dbinc/db_swap.h>
#include "phys_rep_lsn.h"
#include "tranlog.h"
#include <cdb2api.h>
#include <parse_lsn.h>
#include "locks.h"
#include <lockmacros.h>
#include <tohex.h>
int matchable_log_type(int rectype);
extern int gbl_verbose_physrep;
int gbl_physrep_exit_on_invalid_logstream = 0;
LOG_INFO get_last_lsn(bdb_state_type *bdb_state)
{
int rc;
/* get db internals */
DB_LOGC *logc;
DBT logrec;
DB_LSN last_log_lsn;
LOG_INFO log_info = {0};
rc = bdb_state->dbenv->log_cursor(bdb_state->dbenv, &logc, 0);
if (rc) {
logmsg(LOGMSG_ERROR, "%s: can't get log cursor rc %d\n", __func__, rc);
return log_info;
}
bzero(&logrec, sizeof(DBT));
logrec.flags = DB_DBT_MALLOC;
rc = logc->get(logc, &last_log_lsn, &logrec, DB_LAST);
if (rc) {
logmsg(LOGMSG_ERROR, "%s: can't get last log record rc %d\n", __func__,
rc);
logc->close(logc, 0);
return log_info;
}
if (gbl_verbose_physrep)
logmsg(LOGMSG_USER, "%s: LSN %u:%u\n", __func__, last_log_lsn.file,
last_log_lsn.offset);
log_info.file = last_log_lsn.file;
log_info.offset = last_log_lsn.offset;
log_info.size = logrec.size;
if (logrec.data)
free(logrec.data);
logc->close(logc, 0);
return log_info;
}
int compare_log(DBT *logrec, void *blob, unsigned int blob_len)
{
int rc;
if (logrec->size != blob_len) {
rc = 1;
} else {
rc = memcmp(blob, logrec->data, blob_len);
}
return rc;
}
int find_log_timestamp(bdb_state_type *bdb_state, time_t time,
unsigned int *file, unsigned int *offset)
{
int rc;
u_int64_t my_time;
/* get db internals */
DB_LOGC *logc;
DBT logrec;
DB_LSN rec_lsn;
u_int32_t rectype;
/* get last record then iterate */
rc = bdb_state->dbenv->log_cursor(bdb_state->dbenv, &logc, 0);
if (rc) {
logmsg(LOGMSG_ERROR, "%s: can't get log cursor rc %d\n", __func__, rc);
return 1;
}
bzero(&logrec, sizeof(DBT));
logrec.flags = DB_DBT_REALLOC;
do {
do {
rc = logc->get(logc, &rec_lsn, &logrec, DB_PREV);
if (rc) {
logmsg(LOGMSG_ERROR, "%s: can't get log record rc %d\n",
__func__, rc);
logc->close(logc, 0);
if (logrec.data)
free(logrec.data);
return 1;
}
LOGCOPY_32(&rectype, logrec.data);
} while (!matchable_log_type(rectype));
my_time = get_timestamp_from_matchable_record(logrec.data);
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER, "%s my ts is %"PRIu64", {%u:%u}\n", __func__,
my_time, rec_lsn.file, rec_lsn.offset);
}
} while (time < my_time);
if (logrec.data) {
free(logrec.data);
logrec.data = NULL;
}
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER, "%s ts is %"PRIu64", {%u:%u}\n", __func__, my_time,
rec_lsn.file, rec_lsn.offset);
}
*file = rec_lsn.file;
*offset = rec_lsn.offset;
return 0;
}
static int get_next_matchable(DB_LOGC *logc, LOG_INFO *info, int check_current,
DBT *logrec)
{
int rc;
u_int32_t rectype;
/* get db internals */
DB_LSN match_lsn;
LOG_INFO log_info;
log_info.file = log_info.offset = log_info.size = 0;
match_lsn.file = info->file;
match_lsn.offset = info->offset;
if (check_current) {
if ((rc = logc->get(logc, &match_lsn, logrec, DB_SET)) != 0) {
logmsg(LOGMSG_ERROR, "%s: can't find log record {%d:%d}, rc %d\n",
__func__, info->file, info->offset, rc);
return 1;
}
LOGCOPY_32(&rectype, logrec->data);
if (matchable_log_type(rectype)) {
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER, "%s: initial rec {%u:%u} is matchable\n",
__func__, info->file, info->offset);
}
assert(info->file == match_lsn.file);
assert(info->offset == match_lsn.offset);
info->size = logrec->size;
return 0;
}
}
do {
rc = logc->get(logc, &match_lsn, logrec, DB_PREV);
if (rc) {
logmsg(LOGMSG_ERROR,
"%s: can't get prev log record for {%d:%d} rc"
"%d\n",
__func__, match_lsn.file, match_lsn.offset, rc);
free(logrec->data);
logrec->data = NULL;
return 1;
}
LOGCOPY_32(&rectype, logrec->data);
} while (!matchable_log_type(rectype));
info->file = match_lsn.file;
info->offset = match_lsn.offset;
info->size = logrec->size;
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER, "%s: Found matchable {%u:%u}\n", __func__,
info->file, info->offset);
}
return rc;
}
/* generator code */
uint32_t get_next_offset(DB_ENV *dbenv, LOG_INFO log_info)
{
return log_info.offset + log_info.size + dbenv->get_log_header_size(dbenv);
}
int apply_log(DB_ENV *dbenv, unsigned int file, unsigned int offset,
int64_t rectype, void *blob, int blob_len)
{
return dbenv->apply_log(dbenv, file, offset, rectype, blob, blob_len);
}
int truncate_log_lock(bdb_state_type *bdb_state, unsigned int file,
unsigned int offset, uint32_t flags)
{
extern int gbl_online_recovery;
char *msg = "truncate log";
int online = gbl_online_recovery;
if (flags &&
bdb_state->repinfo->master_host != bdb_state->repinfo->myhost) {
return send_truncate_to_master(bdb_state, file, offset);
}
if (online) {
BDB_READLOCK(msg);
} else {
BDB_WRITELOCK(msg);
}
bdb_state->dbenv->rep_verify_match(bdb_state->dbenv, file, offset, online);
/* have to get lock for recovery */
BDB_RELLOCK();
return 0;
}
LOG_INFO find_match_lsn(void *in_bdb_state, cdb2_hndl_tp *repl_db,
LOG_INFO start_info)
{
int rc;
char sql_cmd[128];
bdb_state_type *bdb_state = (bdb_state_type *)in_bdb_state;
void *blob;
char *lsn;
int blob_len;
int match_current = 1;
unsigned int match_file, match_offset;
LOG_INFO info = {0};
DB_LOGC *logc;
DBT logrec = {0};
rc = bdb_state->dbenv->log_cursor(bdb_state->dbenv, &logc, 0);
if (rc) {
logmsg(LOGMSG_ERROR, "%s: can't get log cursor rc %d\n", __func__, rc);
return info;
}
logrec.flags = DB_DBT_REALLOC;
while (
!(rc = get_next_matchable(logc, &start_info, match_current, &logrec))) {
match_current = 0;
snprintf(
sql_cmd, sizeof(sql_cmd),
"select * from comdb2_transaction_logs('{%d:%d}','{%d:%d}', 0)",
start_info.file, start_info.offset, start_info.file,
start_info.offset);
if ((rc = cdb2_run_statement(repl_db, sql_cmd)) == 0) {
if ((rc = cdb2_next_record(repl_db)) == CDB2_OK) {
lsn = (char *)cdb2_column_value(repl_db, 0);
if (!lsn) {
logmsg(LOGMSG_ERROR,
"%s: null lsn for probe of {%d:%d}."
" going to next record\n",
__func__, start_info.file, start_info.offset);
continue;
}
if ((rc = char_to_lsn(lsn, &match_file, &match_offset)) != 0) {
logmsg(LOGMSG_ERROR, "Could not parse lsn? %s\n", lsn);
continue;
}
/* check if lsns match, if not, then get next matchable */
if (match_file != start_info.file ||
match_offset != start_info.offset) {
logmsg(LOGMSG_ERROR,
"%s not same lsn{%u:%u} vs "
"{%u:%u}??? \n",
__func__, start_info.file, start_info.offset,
match_file, match_offset);
continue;
}
/* here lsns match, thus we can now compare them */
blob = cdb2_column_value(repl_db, 4);
blob_len = cdb2_column_size(repl_db, 4);
if ((rc = compare_log(&logrec, blob, blob_len)) == 0) {
info.file = match_file;
info.offset = match_offset;
info.size = blob_len;
int64_t *gen = (int64_t *)cdb2_column_value(repl_db, 2);
if (gen == NULL) {
info.gen = 0;
if (gbl_physrep_exit_on_invalid_logstream) {
logmsg(LOGMSG_FATAL, "physreps require elect-highest-committed-gen on source- exiting\n");
exit(1);
}
logmsg(LOGMSG_ERROR, "physreps require elect-highest-committed-gen source\n");
} else {
info.gen = *gen;
}
logc->close(logc, 0);
free(logrec.data);
logrec.data = NULL;
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER, "%s: found match at {%d:%d}\n",
__func__, start_info.file, start_info.offset);
}
return info;
} else {
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER, "%s: memcmp failed for {%d:%d}\n",
__func__, start_info.file, start_info.offset);
}
}
} else {
/* Didn't find a record: just go to previous */
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER,
"%s: probe of {%d:%d} failed, going to "
"previous\n",
__func__, start_info.file, start_info.offset);
}
}
} else {
/* Run statement failure: close cursor and handle & return */
if (gbl_verbose_physrep) {
logmsg(LOGMSG_USER,
"%s: %s returns %d, '%s': closing "
"connection\n",
__func__, sql_cmd, rc, cdb2_errstr(repl_db));
}
logc->close(logc, 0);
if (logrec.data) {
free(logrec.data);
logrec.data = NULL;
}
return info;
}
}
logmsg(LOGMSG_WARN, "No matchable lsns in the log\n");
logc->close(logc, 0);
if (logrec.data) {
free(logrec.data);
logrec.data = NULL;
}
return info;
}
/* physrep logic to ignore replication traffic for some tables */
static hash_t *table_hash = NULL;
static pthread_mutex_t ignore_lk = PTHREAD_MUTEX_INITIALIZER;
static hash_t *ignore_table_hash()
{
if (table_hash == NULL) {
table_hash = hash_init_str(0);
}
return table_hash;
}
int physrep_add_ignore_table(char *tablename)
{
Pthread_mutex_lock(&ignore_lk);
hash_t *th = ignore_table_hash();
if (hash_find(th, tablename) == NULL) {
hash_add(th, tablename);
} else {
free(tablename);
}
Pthread_mutex_unlock(&ignore_lk);
return 0;
}
int physrep_ignore_table(const char *tablename)
{
int ret = 0;
Pthread_mutex_lock(&ignore_lk);
hash_t *th = ignore_table_hash();
if (hash_find(th, tablename) != NULL) {
ret = 1;
}
Pthread_mutex_unlock(&ignore_lk);
return ret;
}
static int physrep_print_table(void *obj, void *arg)
{
char *table = (char *)obj;
logmsg(LOGMSG_INFO, "%s\n", table);
return 0;
}
int physrep_list_ignored_tables(void)
{
Pthread_mutex_lock(&ignore_lk);
hash_t *th = ignore_table_hash();
hash_for(th, physrep_print_table, NULL);
Pthread_mutex_unlock(&ignore_lk);
return 0;
}
int physrep_ignore_table_count()
{
int count = 0;
Pthread_mutex_lock(&ignore_lk);
hash_t *th = ignore_table_hash();
hash_info(th, NULL, NULL, NULL, NULL, &count, NULL, NULL);
Pthread_mutex_unlock(&ignore_lk);
return count;
}
int physrep_ignore_btree(const char *filename)
{
char *start = (char *)&filename[4];
char *end = (char *)&filename[strlen(filename) - 1];
while (end > start && *end != '\0' && *end != '.') {
end--;
}
end -= 17;
if (end <= start) {
logmsg(LOGMSG_ERROR, "%s: unrecognized file format for %s\n", __func__, filename);
return 0;
}
char t[MAXTABLELEN + 1] = {0};
memcpy(t, start, (end - start));
return physrep_ignore_table(t);
}