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Commit a168cfb3 authored by Sergey Vojtovich's avatar Sergey Vojtovich
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Move XID_state::xa_state handing inside xa.cc 

Let xid_cache_insert()/xid_cache_delete() handle xa_state.

Let session tracker use is_explicit_XA() rather than xa_state != XA_NOTR.

Fixed open_tables() to refuse data access in XA_ROLLBACK_ONLY state.

Removed dead code from THD::cleanup(). It was supposed to be a reminder,
but it got messed up over time.

spider_internal_start_trx() is called either with XA_NOTR or XA_ACTIVE,
which is guarded by server callers. Thus is_explicit_XA() is acceptable
replacement for XA_ACTIVE check (which was likely wrong anyway).

Setting xa_state to XA_PREPARED in spider_internal_xa_prepare() isn't
meaningful, as this value is never accessed later. It can't be accessed
by current thread and it can't be recovered either. It can only be
accessed by spider internally, which never happens.

Make spider_xa_lock()/spider_xa_unlock() static.

Part of MDEV-7974 - backport fix for mysql bug#12161 (XA and binlog)
parent f189f34e
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Inline Side-by-side
Showing with 56 additions and 80 deletions
sql/handler.cc
View file @ a168cfb3
...@@ -2109,7 +2109,7 @@ static my_bool xarecover_handlerton(THD *unused, plugin_ref plugin, ...@@ -2109,7 +2109,7 @@ static my_bool xarecover_handlerton(THD *unused, plugin_ref plugin,
char buf[XIDDATASIZE*4+6]; // see xid_to_str char buf[XIDDATASIZE*4+6]; // see xid_to_str
DBUG_PRINT("info", ("ignore xid %s", xid_to_str(buf, info->list+i))); DBUG_PRINT("info", ("ignore xid %s", xid_to_str(buf, info->list+i)));
#endif #endif
xid_cache_insert(info->list+i, XA_PREPARED); xid_cache_insert(info->list + i);
info->found_foreign_xids++; info->found_foreign_xids++;
continue; continue;
} }
......
sql/session_tracker.cc
View file @ a168cfb3
...@@ -1108,7 +1108,7 @@ bool Transaction_state_tracker::store(THD *thd, String *buf) ...@@ -1108,7 +1108,7 @@ bool Transaction_state_tracker::store(THD *thd, String *buf)
if ((thd->variables.session_track_transaction_info == TX_TRACK_CHISTICS) && if ((thd->variables.session_track_transaction_info == TX_TRACK_CHISTICS) &&
(tx_changed & TX_CHG_CHISTICS)) (tx_changed & TX_CHG_CHISTICS))
{ {
bool is_xa= (thd->transaction.xid_state.xa_state != XA_NOTR); bool is_xa= thd->transaction.xid_state.is_explicit_XA();
size_t start; size_t start;
/* 2 length by 1 byte and code */ /* 2 length by 1 byte and code */
......
sql/sql_base.cc
View file @ a168cfb3
...@@ -4190,13 +4190,9 @@ bool open_tables(THD *thd, const DDL_options_st &options, ...@@ -4190,13 +4190,9 @@ bool open_tables(THD *thd, const DDL_options_st &options,
bool has_prelocking_list; bool has_prelocking_list;
DBUG_ENTER("open_tables"); DBUG_ENTER("open_tables");
/* Accessing data in XA_IDLE or XA_PREPARED is not allowed. */ /* Data access in XA transaction is only allowed when it is active. */
enum xa_states xa_state= thd->transaction.xid_state.xa_state; if (*start && thd->transaction.xid_state.check_has_uncommitted_xa())
if (*start && (xa_state == XA_IDLE || xa_state == XA_PREPARED))
{
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]);
DBUG_RETURN(true); DBUG_RETURN(true);
}
thd->current_tablenr= 0; thd->current_tablenr= 0;
restart: restart:
......
sql/sql_class.cc
View file @ a168cfb3
...@@ -1509,12 +1509,6 @@ void THD::cleanup(void) ...@@ -1509,12 +1509,6 @@ void THD::cleanup(void)
DBUG_ASSERT(cleanup_done == 0); DBUG_ASSERT(cleanup_done == 0);
set_killed(KILL_CONNECTION); set_killed(KILL_CONNECTION);
#ifdef ENABLE_WHEN_BINLOG_WILL_BE_ABLE_TO_PREPARE
if (transaction.xid_state.xa_state == XA_PREPARED)
{
#error xid_state in the cache should be replaced by the allocated value
}
#endif
#ifdef WITH_WSREP #ifdef WITH_WSREP
if (wsrep_cs().state() != wsrep::client_state::s_none) if (wsrep_cs().state() != wsrep::client_state::s_none)
{ {
...@@ -1529,9 +1523,8 @@ void THD::cleanup(void) ...@@ -1529,9 +1523,8 @@ void THD::cleanup(void)
delete_dynamic(&user_var_events); delete_dynamic(&user_var_events);
close_temporary_tables(); close_temporary_tables();
transaction.xid_state.xa_state= XA_NOTR;
trans_rollback(this);
xid_cache_delete(this, &transaction.xid_state); xid_cache_delete(this, &transaction.xid_state);
trans_rollback(this);
DBUG_ASSERT(open_tables == NULL); DBUG_ASSERT(open_tables == NULL);
/* /*
......
sql/transaction.cc
View file @ a168cfb3
...@@ -66,7 +66,6 @@ void trans_reset_one_shot_chistics(THD *thd) ...@@ -66,7 +66,6 @@ void trans_reset_one_shot_chistics(THD *thd)
/* Conditions under which the transaction state must not change. */ /* Conditions under which the transaction state must not change. */
static bool trans_check(THD *thd) static bool trans_check(THD *thd)
{ {
enum xa_states xa_state= thd->transaction.xid_state.xa_state;
DBUG_ENTER("trans_check"); DBUG_ENTER("trans_check");
/* /*
...@@ -77,8 +76,8 @@ static bool trans_check(THD *thd) ...@@ -77,8 +76,8 @@ static bool trans_check(THD *thd)
if (unlikely(thd->in_sub_stmt)) if (unlikely(thd->in_sub_stmt))
my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0)); my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
if (xa_state != XA_NOTR) if (thd->transaction.xid_state.is_explicit_XA())
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]); thd->transaction.xid_state.er_xaer_rmfail();
else else
DBUG_RETURN(FALSE); DBUG_RETURN(FALSE);
......
sql/xa.cc
View file @ a168cfb3
...@@ -137,9 +137,6 @@ class XID_cache_element ...@@ -137,9 +137,6 @@ class XID_cache_element
static LF_HASH xid_cache; static LF_HASH xid_cache;
static bool xid_cache_inited; static bool xid_cache_inited;
const char *xa_state_names[]= {
"NON-EXISTING", "ACTIVE", "IDLE", "PREPARED", "ROLLBACK ONLY"
};
bool THD::fix_xid_hash_pins() bool THD::fix_xid_hash_pins()
...@@ -156,6 +153,37 @@ void XID_STATE::set_error(uint error) ...@@ -156,6 +153,37 @@ void XID_STATE::set_error(uint error)
xid_cache_element->rm_error= error; xid_cache_element->rm_error= error;
} }
void XID_STATE::er_xaer_rmfail() const
{
static const char *xa_state_names[]=
{ "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED", "ROLLBACK ONLY" };
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]);
}
/**
Check that XA transaction has an uncommitted work. Report an error
to the user in case when there is an uncommitted work for XA transaction.
@return result of check
@retval false XA transaction is NOT in state IDLE, PREPARED
or ROLLBACK_ONLY.
@retval true XA transaction is in state IDLE or PREPARED
or ROLLBACK_ONLY.
*/
bool XID_STATE::check_has_uncommitted_xa() const
{
if (xa_state == XA_IDLE ||
xa_state == XA_PREPARED ||
xa_state == XA_ROLLBACK_ONLY)
{
er_xaer_rmfail();
return true;
}
return false;
}
void xid_cache_init() void xid_cache_init()
{ {
...@@ -201,7 +229,7 @@ static XID_STATE *xid_cache_search(THD *thd, XID *xid) ...@@ -201,7 +229,7 @@ static XID_STATE *xid_cache_search(THD *thd, XID *xid)
} }
bool xid_cache_insert(XID *xid, enum xa_states xa_state) bool xid_cache_insert(XID *xid)
{ {
XID_STATE *xs; XID_STATE *xs;
LF_PINS *pins; LF_PINS *pins;
...@@ -212,13 +240,15 @@ bool xid_cache_insert(XID *xid, enum xa_states xa_state) ...@@ -212,13 +240,15 @@ bool xid_cache_insert(XID *xid, enum xa_states xa_state)
if ((xs= (XID_STATE*) my_malloc(sizeof(*xs), MYF(MY_WME)))) if ((xs= (XID_STATE*) my_malloc(sizeof(*xs), MYF(MY_WME))))
{ {
xs->xa_state=xa_state;
xs->xid.set(xid); xs->xid.set(xid);
if ((res= lf_hash_insert(&xid_cache, pins, xs))) if ((res= lf_hash_insert(&xid_cache, pins, xs)))
my_free(xs); my_free(xs);
else else
{
xs->xa_state= XA_PREPARED;
xs->xid_cache_element->set(XID_cache_element::RECOVERED); xs->xid_cache_element->set(XID_cache_element::RECOVERED);
}
if (res == 1) if (res == 1)
res= 0; res= 0;
} }
...@@ -236,6 +266,7 @@ bool xid_cache_insert(THD *thd, XID_STATE *xid_state) ...@@ -236,6 +266,7 @@ bool xid_cache_insert(THD *thd, XID_STATE *xid_state)
switch (res) switch (res)
{ {
case 0: case 0:
xid_state->xa_state= XA_ACTIVE;
xid_state->xid_cache_element->set(XID_cache_element::ACQUIRED); xid_state->xid_cache_element->set(XID_cache_element::ACQUIRED);
break; break;
case 1: case 1:
...@@ -262,6 +293,7 @@ void xid_cache_delete(THD *thd, XID_STATE *xid_state) ...@@ -262,6 +293,7 @@ void xid_cache_delete(THD *thd, XID_STATE *xid_state)
else else
{ {
xid_state->xid_cache_element= 0; xid_state->xid_cache_element= 0;
xid_state->xa_state= XA_NOTR;
xid_state->xid.null(); xid_state->xid.null();
} }
} }
...@@ -373,18 +405,16 @@ bool trans_xa_start(THD *thd) ...@@ -373,18 +405,16 @@ bool trans_xa_start(THD *thd)
/* TODO: JOIN is not supported yet. */ /* TODO: JOIN is not supported yet. */
if (thd->lex->xa_opt != XA_NONE) if (thd->lex->xa_opt != XA_NONE)
my_error(ER_XAER_INVAL, MYF(0)); my_error(ER_XAER_INVAL, MYF(0));
else if (xa_state != XA_NOTR) else if (thd->transaction.xid_state.is_explicit_XA())
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]); thd->transaction.xid_state.er_xaer_rmfail();
else if (thd->locked_tables_mode || thd->in_active_multi_stmt_transaction()) else if (thd->locked_tables_mode || thd->in_active_multi_stmt_transaction())
my_error(ER_XAER_OUTSIDE, MYF(0)); my_error(ER_XAER_OUTSIDE, MYF(0));
else if (!trans_begin(thd)) else if (!trans_begin(thd))
{ {
DBUG_ASSERT(thd->transaction.xid_state.xid.is_null()); DBUG_ASSERT(thd->transaction.xid_state.xid.is_null());
thd->transaction.xid_state.xa_state= XA_ACTIVE;
thd->transaction.xid_state.xid.set(thd->lex->xid); thd->transaction.xid_state.xid.set(thd->lex->xid);
if (xid_cache_insert(thd, &thd->transaction.xid_state)) if (xid_cache_insert(thd, &thd->transaction.xid_state))
{ {
thd->transaction.xid_state.xa_state= XA_NOTR;
thd->transaction.xid_state.xid.null(); thd->transaction.xid_state.xid.null();
trans_rollback(thd); trans_rollback(thd);
DBUG_RETURN(true); DBUG_RETURN(true);
...@@ -413,8 +443,7 @@ bool trans_xa_end(THD *thd) ...@@ -413,8 +443,7 @@ bool trans_xa_end(THD *thd)
if (thd->lex->xa_opt != XA_NONE) if (thd->lex->xa_opt != XA_NONE)
my_error(ER_XAER_INVAL, MYF(0)); my_error(ER_XAER_INVAL, MYF(0));
else if (thd->transaction.xid_state.xa_state != XA_ACTIVE) else if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
my_error(ER_XAER_RMFAIL, MYF(0), thd->transaction.xid_state.er_xaer_rmfail();
xa_state_names[thd->transaction.xid_state.xa_state]);
else if (!thd->transaction.xid_state.xid.eq(thd->lex->xid)) else if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
my_error(ER_XAER_NOTA, MYF(0)); my_error(ER_XAER_NOTA, MYF(0));
else if (!xa_trans_rolled_back(&thd->transaction.xid_state)) else if (!xa_trans_rolled_back(&thd->transaction.xid_state))
...@@ -439,14 +468,12 @@ bool trans_xa_prepare(THD *thd) ...@@ -439,14 +468,12 @@ bool trans_xa_prepare(THD *thd)
DBUG_ENTER("trans_xa_prepare"); DBUG_ENTER("trans_xa_prepare");
if (thd->transaction.xid_state.xa_state != XA_IDLE) if (thd->transaction.xid_state.xa_state != XA_IDLE)
my_error(ER_XAER_RMFAIL, MYF(0), thd->transaction.xid_state.er_xaer_rmfail();
xa_state_names[thd->transaction.xid_state.xa_state]);
else if (!thd->transaction.xid_state.xid.eq(thd->lex->xid)) else if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
my_error(ER_XAER_NOTA, MYF(0)); my_error(ER_XAER_NOTA, MYF(0));
else if (ha_prepare(thd)) else if (ha_prepare(thd))
{ {
xid_cache_delete(thd, &thd->transaction.xid_state); xid_cache_delete(thd, &thd->transaction.xid_state);
thd->transaction.xid_state.xa_state= XA_NOTR;
my_error(ER_XA_RBROLLBACK, MYF(0)); my_error(ER_XA_RBROLLBACK, MYF(0));
} }
else else
...@@ -535,7 +562,7 @@ bool trans_xa_commit(THD *thd) ...@@ -535,7 +562,7 @@ bool trans_xa_commit(THD *thd)
} }
else else
{ {
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]); thd->transaction.xid_state.er_xaer_rmfail();
DBUG_RETURN(TRUE); DBUG_RETURN(TRUE);
} }
...@@ -545,7 +572,6 @@ bool trans_xa_commit(THD *thd) ...@@ -545,7 +572,6 @@ bool trans_xa_commit(THD *thd)
~(SERVER_STATUS_IN_TRANS | SERVER_STATUS_IN_TRANS_READONLY); ~(SERVER_STATUS_IN_TRANS | SERVER_STATUS_IN_TRANS_READONLY);
DBUG_PRINT("info", ("clearing SERVER_STATUS_IN_TRANS")); DBUG_PRINT("info", ("clearing SERVER_STATUS_IN_TRANS"));
xid_cache_delete(thd, &thd->transaction.xid_state); xid_cache_delete(thd, &thd->transaction.xid_state);
thd->transaction.xid_state.xa_state= XA_NOTR;
trans_track_end_trx(thd); trans_track_end_trx(thd);
...@@ -590,7 +616,7 @@ bool trans_xa_rollback(THD *thd) ...@@ -590,7 +616,7 @@ bool trans_xa_rollback(THD *thd)
if (xa_state != XA_IDLE && xa_state != XA_PREPARED && xa_state != XA_ROLLBACK_ONLY) if (xa_state != XA_IDLE && xa_state != XA_PREPARED && xa_state != XA_ROLLBACK_ONLY)
{ {
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]); thd->transaction.xid_state.er_xaer_rmfail();
DBUG_RETURN(TRUE); DBUG_RETURN(TRUE);
} }
...@@ -602,7 +628,6 @@ bool trans_xa_rollback(THD *thd) ...@@ -602,7 +628,6 @@ bool trans_xa_rollback(THD *thd)
~(SERVER_STATUS_IN_TRANS | SERVER_STATUS_IN_TRANS_READONLY); ~(SERVER_STATUS_IN_TRANS | SERVER_STATUS_IN_TRANS_READONLY);
DBUG_PRINT("info", ("clearing SERVER_STATUS_IN_TRANS")); DBUG_PRINT("info", ("clearing SERVER_STATUS_IN_TRANS"));
xid_cache_delete(thd, &thd->transaction.xid_state); xid_cache_delete(thd, &thd->transaction.xid_state);
thd->transaction.xid_state.xa_state= XA_NOTR;
trans_track_end_trx(thd); trans_track_end_trx(thd);
......
sql/xa.h
View file @ a168cfb3
...@@ -18,7 +18,6 @@ ...@@ -18,7 +18,6 @@
enum xa_states {XA_NOTR=0, XA_ACTIVE, XA_IDLE, XA_PREPARED, XA_ROLLBACK_ONLY}; enum xa_states {XA_NOTR=0, XA_ACTIVE, XA_IDLE, XA_PREPARED, XA_ROLLBACK_ONLY};
extern const char *xa_state_names[];
class XID_cache_element; class XID_cache_element;
struct XID_STATE { struct XID_STATE {
...@@ -27,36 +26,15 @@ struct XID_STATE { ...@@ -27,36 +26,15 @@ struct XID_STATE {
enum xa_states xa_state; // used by external XA only enum xa_states xa_state; // used by external XA only
XID_cache_element *xid_cache_element; XID_cache_element *xid_cache_element;
/** bool check_has_uncommitted_xa() const;
Check that XA transaction has an uncommitted work. Report an error
to the user in case when there is an uncommitted work for XA transaction.
@return result of check
@retval false XA transaction is NOT in state IDLE, PREPARED
or ROLLBACK_ONLY.
@retval true XA transaction is in state IDLE or PREPARED
or ROLLBACK_ONLY.
*/
bool check_has_uncommitted_xa() const
{
if (xa_state == XA_IDLE ||
xa_state == XA_PREPARED ||
xa_state == XA_ROLLBACK_ONLY)
{
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[xa_state]);
return true;
}
return false;
}
bool is_explicit_XA() const { return xid_cache_element != 0; } bool is_explicit_XA() const { return xid_cache_element != 0; }
void set_error(uint error); void set_error(uint error);
void er_xaer_rmfail() const;
}; };
void xid_cache_init(void); void xid_cache_init(void);
void xid_cache_free(void); void xid_cache_free(void);
bool xid_cache_insert(XID *xid, enum xa_states xa_state); bool xid_cache_insert(XID *xid);
bool xid_cache_insert(THD *thd, XID_STATE *xid_state); bool xid_cache_insert(THD *thd, XID_STATE *xid_state);
void xid_cache_delete(THD *thd, XID_STATE *xid_state); void xid_cache_delete(THD *thd, XID_STATE *xid_state);
......
storage/spider/spd_trx.cc
View file @ a168cfb3
...@@ -1707,7 +1707,7 @@ int spider_check_and_set_time_zone( ...@@ -1707,7 +1707,7 @@ int spider_check_and_set_time_zone(
DBUG_RETURN(0); DBUG_RETURN(0);
} }
int spider_xa_lock( static int spider_xa_lock(
XID_STATE *xid_state XID_STATE *xid_state
) { ) {
THD *thd = current_thd; THD *thd = current_thd;
...@@ -1791,7 +1791,7 @@ int spider_xa_lock( ...@@ -1791,7 +1791,7 @@ int spider_xa_lock(
DBUG_RETURN(error_num); DBUG_RETURN(error_num);
} }
int spider_xa_unlock( static int spider_xa_unlock(
XID_STATE *xid_state XID_STATE *xid_state
) { ) {
THD *thd = current_thd; THD *thd = current_thd;
...@@ -1910,7 +1910,7 @@ int spider_internal_start_trx( ...@@ -1910,7 +1910,7 @@ int spider_internal_start_trx(
if (!trx->trx_start) if (!trx->trx_start)
{ {
if ( if (
thd->transaction.xid_state.xa_state == XA_ACTIVE && thd->transaction.xid_state.is_explicit_XA() &&
spider_param_support_xa() spider_param_support_xa()
) { ) {
trx->trx_xa = TRUE; trx->trx_xa = TRUE;
...@@ -1948,7 +1948,6 @@ int spider_internal_start_trx( ...@@ -1948,7 +1948,6 @@ int spider_internal_start_trx(
thd->server_id)); thd->server_id));
#endif #endif
trx->internal_xid_state.xa_state = XA_ACTIVE;
trx->internal_xid_state.xid.set(&trx->xid); trx->internal_xid_state.xid.set(&trx->xid);
#ifdef SPIDER_XID_STATE_HAS_in_thd #ifdef SPIDER_XID_STATE_HAS_in_thd
trx->internal_xid_state.in_thd = 1; trx->internal_xid_state.in_thd = 1;
...@@ -2217,7 +2216,6 @@ int spider_internal_xa_commit( ...@@ -2217,7 +2216,6 @@ int spider_internal_xa_commit(
table_xa_opened = FALSE; table_xa_opened = FALSE;
} }
spider_xa_unlock(&trx->internal_xid_state); spider_xa_unlock(&trx->internal_xid_state);
trx->internal_xid_state.xa_state = XA_NOTR;
DBUG_RETURN(0); DBUG_RETURN(0);
error: error:
...@@ -2228,7 +2226,6 @@ int spider_internal_xa_commit( ...@@ -2228,7 +2226,6 @@ int spider_internal_xa_commit(
error_in_commit: error_in_commit:
error_open_table: error_open_table:
spider_xa_unlock(&trx->internal_xid_state); spider_xa_unlock(&trx->internal_xid_state);
trx->internal_xid_state.xa_state = XA_NOTR;
DBUG_RETURN(error_num); DBUG_RETURN(error_num);
} }
...@@ -2455,7 +2452,6 @@ int spider_internal_xa_rollback( ...@@ -2455,7 +2452,6 @@ int spider_internal_xa_rollback(
table_xa_opened = FALSE; table_xa_opened = FALSE;
} }
spider_xa_unlock(&trx->internal_xid_state); spider_xa_unlock(&trx->internal_xid_state);
trx->internal_xid_state.xa_state = XA_NOTR;
DBUG_RETURN(0); DBUG_RETURN(0);
error: error:
...@@ -2466,7 +2462,6 @@ int spider_internal_xa_rollback( ...@@ -2466,7 +2462,6 @@ int spider_internal_xa_rollback(
error_in_rollback: error_in_rollback:
error_open_table: error_open_table:
spider_xa_unlock(&trx->internal_xid_state); spider_xa_unlock(&trx->internal_xid_state);
trx->internal_xid_state.xa_state = XA_NOTR;
DBUG_RETURN(error_num); DBUG_RETURN(error_num);
} }
...@@ -2635,8 +2630,6 @@ int spider_internal_xa_prepare( ...@@ -2635,8 +2630,6 @@ int spider_internal_xa_prepare(
spider_close_sys_table(thd, table_xa, &open_tables_backup, TRUE); spider_close_sys_table(thd, table_xa, &open_tables_backup, TRUE);
table_xa_opened = FALSE; table_xa_opened = FALSE;
} }
if (internal_xa)
trx->internal_xid_state.xa_state = XA_PREPARED;
DBUG_RETURN(0); DBUG_RETURN(0);
error: error:
......
storage/spider/spd_trx.h
View file @ a168cfb3
...@@ -112,14 +112,6 @@ int spider_check_and_set_time_zone( ...@@ -112,14 +112,6 @@ int spider_check_and_set_time_zone(
int *need_mon int *need_mon
); );
int spider_xa_lock(
XID_STATE *xid_state
);
int spider_xa_unlock(
XID_STATE *xid_state
);
int spider_start_internal_consistent_snapshot( int spider_start_internal_consistent_snapshot(
SPIDER_TRX *trx, SPIDER_TRX *trx,
SPIDER_CONN *conn, SPIDER_CONN *conn,
......
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