<refsynopsisdiv>
<synopsis>
-BEGIN [ WORK | TRANSACTION ] [ <replaceable class="parameter">transaction_mode</replaceable> [, ...] ] [ WAIT FOR LSN <replaceable class="parameter">lsn_value</replaceable> [TIMEOUT <replaceable class="parameter">number_of_milliseconds</replaceable> ] ]
+BEGIN [ WORK | TRANSACTION ] [ <replaceable class="parameter">transaction_mode</replaceable> [, ...] ]
<phrase>where <replaceable class="parameter">transaction_mode</replaceable> is one of:</phrase>
<xref linkend="sql-set-transaction"/>
was executed.
</para>
-
- <para>
- The <literal>WAIT FOR</literal> clause allows to wait for the target log
- sequence number (<acronym>LSN</acronym>) to be replayed on standby before
- starting the transaction in <productname>PostgreSQL</productname> databases
- with master-standby asynchronous replication. Wait time can be limited by
- specifying a timeout, which is measured in milliseconds and must be a positive
- integer. If <acronym>LSN</acronym> was not reached before timeout, transaction
- doesn't begin. Waiting can be interrupted by cancelling
- <literal>BEGIN</literal> command.
- </para>
</refsect1>
<refsect1>
different purpose in embedded SQL. You are advised to be careful
about the transaction semantics when porting database applications.
</para>
-
- <para>
- There is no <literal>WAIT FOR</literal> clause in the SQL standard.
- </para>
</refsect1>
<refsect1>
<refsynopsisdiv>
<synopsis>
-START TRANSACTION [ <replaceable class="parameter">transaction_mode</replaceable> [, ...] ] [ WAIT FOR LSN <replaceable class="parameter">lsn_value</replaceable> [TIMEOUT <replaceable class="parameter">number_of_milliseconds</replaceable> ] ]
+START TRANSACTION [ <replaceable class="parameter">transaction_mode</replaceable> [, ...] ]
<phrase>where <replaceable class="parameter">transaction_mode</replaceable> is one of:</phrase>
characteristics, as if <xref linkend="sql-set-transaction"/> was executed. This is the same
as the <xref linkend="sql-begin"/> command.
</para>
-
- <para>
- The <literal>WAIT FOR</literal> clause allows to wait for the target log
- sequence number (<acronym>LSN</acronym>) to be replayed on standby before
- starting the transaction in <productname>PostgreSQL</productname> databases
- with master-standby asynchronous replication. Wait time can be limited by
- specifying a timeout, which is measured in milliseconds and must be a positive
- integer. If <acronym>LSN</acronym> was not reached before timeout, transaction
- doesn't begin. Waiting can be interrupted by cancelling
- <literal>START TRANSACTION</literal> command.
- </para>
</refsect1>
<refsect1>
omitted.
</para>
- <para>
- There is no <literal>WAIT FOR</literal> clause in the SQL standard.
- </para>
-
<para>
See also the compatibility section of <xref linkend="sql-set-transaction"/>.
</para>
#include "catalog/pg_database.h"
#include "commands/progress.h"
#include "commands/tablespace.h"
-#include "commands/wait.h"
#include "common/controldata_utils.h"
#include "executor/instrument.h"
#include "miscadmin.h"
do
{
bool switchedTLI = false;
- XLogRecPtr minWaitedLSN;
#ifdef WAL_DEBUG
if (XLOG_DEBUG ||
break;
}
- /*
- * If we replayed an LSN that someone was waiting for, set
- * latches in shared memory array to notify the waiter.
- */
- minWaitedLSN = WaitLSNGetMin();
- if (!XLogRecPtrIsInvalid(minWaitedLSN) &&
- minWaitedLSN <= XLogCtl->lastReplayedEndRecPtr)
- {
- WaitLSNSetLatch(XLogCtl->lastReplayedEndRecPtr);
- }
-
/* Else, try to fetch the next WAL record */
record = ReadRecord(xlogreader, LOG, false);
} while (record != NULL);
user.o \
vacuum.o \
variable.o \
- view.o \
- wait.o
+ view.o
include $(top_srcdir)/src/backend/common.mk
+++ /dev/null
-/*-------------------------------------------------------------------------
- *
- * wait.c
- * Implements WAIT FOR clause for BEGIN and START TRANSACTION commands.
- * This clause allows waiting for given LSN to be replayed on standby.
- *
- * Copyright (c) 2020, PostgreSQL Global Development Group
- *
- * IDENTIFICATION
- * src/backend/commands/wait.c
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-#include <math.h>
-
-#include "access/xlog.h"
-#include "access/xlogdefs.h"
-#include "commands/wait.h"
-#include "funcapi.h"
-#include "miscadmin.h"
-#include "pgstat.h"
-#include "storage/backendid.h"
-#include "storage/pmsignal.h"
-#include "storage/proc.h"
-#include "storage/shmem.h"
-#include "storage/sinvaladt.h"
-#include "storage/spin.h"
-#include "utils/builtins.h"
-#include "utils/pg_lsn.h"
-#include "utils/timestamp.h"
-
-/*
- * Shared memory structure representing information about LSNs, which backends
- * are waiting for replay.
- */
-typedef struct
-{
- slock_t mutex; /* mutex protecting the fields below */
- int max_backend_id; /* max backend_id present in lsns[] */
- pg_atomic_uint64 min_lsn; /* minimal waited LSN */
- /* per-backend array of waited LSNs */
- XLogRecPtr lsns[FLEXIBLE_ARRAY_MEMBER];
-} WaitLSNState;
-
-static WaitLSNState * state;
-
-/*
- * Add the wait event of the current backend to shared memory array
- */
-static void
-WaitLSNAdd(XLogRecPtr lsn_to_wait)
-{
- SpinLockAcquire(&state->mutex);
- if (state->max_backend_id < MyBackendId)
- state->max_backend_id = MyBackendId;
-
- state->lsns[MyBackendId] = lsn_to_wait;
-
- if (lsn_to_wait < state->min_lsn.value)
- state->min_lsn.value = lsn_to_wait;
- SpinLockRelease(&state->mutex);
-}
-
-/*
- * Delete wait event of the current backend from the shared memory array.
- */
-void
-WaitLSNDelete(void)
-{
- int i;
- XLogRecPtr deleted_lsn;
-
- SpinLockAcquire(&state->mutex);
-
- deleted_lsn = state->lsns[MyBackendId];
- state->lsns[MyBackendId] = InvalidXLogRecPtr;
-
- /* If we are deleting the minimal LSN, then choose the next min_lsn */
- if (!XLogRecPtrIsInvalid(deleted_lsn) &&
- deleted_lsn == state->min_lsn.value)
- {
- state->min_lsn.value = InvalidXLogRecPtr;
- for (i = 2; i <= state->max_backend_id; i++)
- {
- if (!XLogRecPtrIsInvalid(state->lsns[i]) &&
- (state->lsns[i] < state->min_lsn.value ||
- XLogRecPtrIsInvalid(state->min_lsn.value)))
- {
- state->min_lsn.value = state->lsns[i];
- }
- }
- }
-
- /* If deleting from the end of the array, shorten the array's used part */
- if (state->max_backend_id == MyBackendId)
- {
- for (i = (MyBackendId); i >= 2; i--)
- if (!XLogRecPtrIsInvalid(state->lsns[i]))
- {
- state->max_backend_id = i;
- break;
- }
- }
-
- SpinLockRelease(&state->mutex);
-}
-
-/*
- * Report amount of shared memory space needed for WaitLSNState
- */
-Size
-WaitLSNShmemSize(void)
-{
- Size size;
-
- size = offsetof(WaitLSNState, lsns);
- size = add_size(size, mul_size(MaxBackends + 1, sizeof(XLogRecPtr)));
- return size;
-}
-
-/*
- * Initialize an shared memory structure for waiting for LSN
- */
-void
-WaitLSNShmemInit(void)
-{
- bool found;
- uint32 i;
-
- state = (WaitLSNState *) ShmemInitStruct("pg_wait_lsn",
- WaitLSNShmemSize(),
- &found);
- if (!found)
- {
- SpinLockInit(&state->mutex);
-
- for (i = 0; i < (MaxBackends + 1); i++)
- state->lsns[i] = InvalidXLogRecPtr;
-
- state->max_backend_id = 0;
- pg_atomic_init_u64(&state->min_lsn, InvalidXLogRecPtr);
- }
-}
-
-/*
- * Set latches in shared memory to signal that new LSN has been replayed
- */
-void
-WaitLSNSetLatch(XLogRecPtr cur_lsn)
-{
- uint32 i;
- int max_backend_id;
- PGPROC *backend;
-
- SpinLockAcquire(&state->mutex);
- max_backend_id = state->max_backend_id;
-
- for (i = 2; i <= max_backend_id; i++)
- {
- backend = BackendIdGetProc(i);
-
- if (backend && state->lsns[i] != 0 &&
- state->lsns[i] <= cur_lsn)
- {
- SetLatch(&backend->procLatch);
- }
- }
- SpinLockRelease(&state->mutex);
-}
-
-/*
- * Get minimal LSN that some backend is waiting for
- */
-XLogRecPtr
-WaitLSNGetMin(void)
-{
- return state->min_lsn.value;
-}
-
-/*
- * On WAIT use a latch to wait till LSN is replayed, postmaster dies or timeout
- * happens. Timeout is specified in milliseconds. Returns true if LSN was
- * reached and false otherwise.
- */
-bool
-WaitLSNUtility(XLogRecPtr target_lsn, const int timeout_ms)
-{
- XLogRecPtr cur_lsn;
- int latch_events;
- float8 endtime;
- bool res = false;
- bool wait_forever = (timeout_ms <= 0);
-
- endtime = GetNowFloat() + timeout_ms / 1000.0;
-
- latch_events = WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH;
-
- /* Check if we already reached the needed LSN */
- cur_lsn = GetXLogReplayRecPtr(NULL);
- if (cur_lsn >= target_lsn)
- return true;
-
- WaitLSNAdd(target_lsn);
- ResetLatch(MyLatch);
-
- /* Recheck if LSN was reached while WaitLSNAdd() and ResetLatch() */
- cur_lsn = GetXLogReplayRecPtr(NULL);
- if (cur_lsn >= target_lsn)
- return true;
-
- for (;;)
- {
- int rc;
- float8 time_left = 0;
- long time_left_ms = 0;
-
- time_left = endtime - GetNowFloat();
-
- /* Use 1 second as the default timeout to check for interrupts */
- if (wait_forever || time_left < 0 || time_left > 1.0)
- time_left_ms = 1000;
- else
- time_left_ms = (long) ceil(time_left * 1000.0);
-
- /* If interrupt, LockErrorCleanup() will do WaitLSNDelete() for us */
- CHECK_FOR_INTERRUPTS();
-
- /* If postmaster dies, finish immediately */
- if (!PostmasterIsAlive())
- break;
-
- rc = WaitLatch(MyLatch, latch_events, time_left_ms,
- WAIT_EVENT_CLIENT_READ);
-
- ResetLatch(MyLatch);
-
- if (rc & WL_LATCH_SET)
- cur_lsn = GetXLogReplayRecPtr(NULL);
-
- if (rc & WL_TIMEOUT)
- {
- time_left = endtime - GetNowFloat();
- /* If the time specified by user has passed, stop waiting */
- if (!wait_forever && time_left <= 0.0)
- break;
- cur_lsn = GetXLogReplayRecPtr(NULL);
- }
-
- /* If LSN has been replayed */
- if (target_lsn <= cur_lsn)
- break;
- }
-
- WaitLSNDelete();
-
- if (cur_lsn < target_lsn)
- ereport(WARNING,
- (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
- errmsg("didn't start transaction because LSN was not reached"),
- errhint("Try to increase wait timeout.")));
- else
- res = true;
-
- return res;
-}
-
-/*
- * Implementation of WAIT FOR clause for BEGIN and START TRANSACTION commands
- */
-int
-WaitLSNMain(WaitClause *stmt, DestReceiver *dest)
-{
- TupleDesc tupdesc;
- TupOutputState *tstate;
- XLogRecPtr target_lsn;
- bool res = false;
-
- target_lsn = DatumGetLSN(DirectFunctionCall1(pg_lsn_in,
- CStringGetDatum(stmt->lsn)));
- res = WaitLSNUtility(target_lsn, stmt->timeout);
-
- /* Need a tuple descriptor representing a single TEXT column */
- tupdesc = CreateTemplateTupleDesc(1);
- TupleDescInitEntry(tupdesc, (AttrNumber) 1, "LSN reached", TEXTOID, -1, 0);
-
- /* Prepare for projection of tuples */
- tstate = begin_tup_output_tupdesc(dest, tupdesc, &TTSOpsMinimalTuple);
-
- /* Send the result */
- do_text_output_oneline(tstate, res ? "t" : "f");
- end_tup_output(tstate);
- return res;
-}
COPY_STRING_FIELD(savepoint_name);
COPY_STRING_FIELD(gid);
COPY_SCALAR_FIELD(chain);
- COPY_NODE_FIELD(wait);
return newnode;
}
-static WaitClause *
-_copyWaitClause(const WaitClause *from)
-{
- WaitClause *newnode = makeNode(WaitClause);
-
- COPY_STRING_FIELD(lsn);
- COPY_SCALAR_FIELD(timeout);
-
- return newnode;
-};
-
static CompositeTypeStmt *
_copyCompositeTypeStmt(const CompositeTypeStmt *from)
{
case T_TransactionStmt:
retval = _copyTransactionStmt(from);
break;
- case T_WaitClause:
- retval = _copyWaitClause(from);
- break;
case T_CompositeTypeStmt:
retval = _copyCompositeTypeStmt(from);
break;
COMPARE_STRING_FIELD(savepoint_name);
COMPARE_STRING_FIELD(gid);
COMPARE_SCALAR_FIELD(chain);
- COMPARE_NODE_FIELD(wait);
-
- return true;
-}
-
-static bool
-_equalWaitClause(const WaitClause *a, const WaitClause *b)
-{
- COMPARE_STRING_FIELD(lsn);
- COMPARE_SCALAR_FIELD(timeout);
return true;
}
case T_TransactionStmt:
retval = _equalTransactionStmt(a, b);
break;
- case T_WaitClause:
- retval = _equalWaitClause(a, b);
- break;
case T_CompositeTypeStmt:
retval = _equalCompositeTypeStmt(a, b);
break;
WRITE_LOCATION_FIELD(location);
}
-static void
-_outTransactionStmt(StringInfo str, const TransactionStmt *node)
-{
- WRITE_NODE_TYPE("TRANSACTIONSTMT");
-
- WRITE_STRING_FIELD(savepoint_name);
- WRITE_STRING_FIELD(gid);
- WRITE_NODE_FIELD(options);
- WRITE_BOOL_FIELD(chain);
- WRITE_ENUM_FIELD(kind, TransactionStmtKind);
- WRITE_NODE_FIELD(wait);
-}
-
-static void
-_outWaitClause(StringInfo str, const WaitClause *node)
-{
- WRITE_NODE_TYPE("WAITCLAUSE");
-
- WRITE_STRING_FIELD(lsn);
- WRITE_UINT_FIELD(timeout);
-}
-
static void
_outTableLikeClause(StringInfo str, const TableLikeClause *node)
{
case T_PartitionRangeDatum:
_outPartitionRangeDatum(str, obj);
break;
- case T_TransactionStmt:
- _outTransactionStmt(str, obj);
- break;
- case T_WaitClause:
- _outWaitClause(str, obj);
- break;
default:
%type <partboundspec> PartitionBoundSpec
%type <list> hash_partbound
%type <defelt> hash_partbound_elem
-%type <ival> wait_time
-%type <node> wait_for
/*
* Non-keyword token types. These are hard-wired into the "flex" lexer.
LABEL LANGUAGE LARGE_P LAST_P LATERAL_P
LEADING LEAKPROOF LEAST LEFT LEVEL LIKE LIMIT LISTEN LOAD LOCAL
- LOCALTIME LOCALTIMESTAMP LOCATION LOCK_P LOCKED LOGGED LSN
+ LOCALTIME LOCALTIMESTAMP LOCATION LOCK_P LOCKED LOGGED
MAPPING MATCH MATERIALIZED MAXVALUE METHOD MINUTE_P MINVALUE MODE MONTH_P MOVE
SUBSCRIPTION SUBSTRING SUPPORT SYMMETRIC SYSID SYSTEM_P
TABLE TABLES TABLESAMPLE TABLESPACE TEMP TEMPLATE TEMPORARY TEXT_P THEN
- TIES TIME TIMEOUT TIMESTAMP TO TRAILING TRANSACTION TRANSFORM
+ TIES TIME TIMESTAMP TO TRAILING TRANSACTION TRANSFORM
TREAT TRIGGER TRIM TRUE_P
TRUNCATE TRUSTED TYPE_P TYPES_P
VACUUM VALID VALIDATE VALIDATOR VALUE_P VALUES VARCHAR VARIADIC VARYING
VERBOSE VERSION_P VIEW VIEWS VOLATILE
- WAIT WHEN WHERE WHITESPACE_P WINDOW
- WITH WITHIN WITHOUT WORK WRAPPER WRITE
+ WHEN WHERE WHITESPACE_P WINDOW WITH WITHIN WITHOUT WORK WRAPPER WRITE
XML_P XMLATTRIBUTES XMLCONCAT XMLELEMENT XMLEXISTS XMLFOREST XMLNAMESPACES
XMLPARSE XMLPI XMLROOT XMLSERIALIZE XMLTABLE
n->chain = $3;
$$ = (Node *)n;
}
- | BEGIN_P opt_transaction transaction_mode_list_or_empty wait_for
+ | BEGIN_P opt_transaction transaction_mode_list_or_empty
{
TransactionStmt *n = makeNode(TransactionStmt);
n->kind = TRANS_STMT_BEGIN;
n->options = $3;
- n->wait = $4;
$$ = (Node *)n;
}
- | START TRANSACTION transaction_mode_list_or_empty wait_for
+ | START TRANSACTION transaction_mode_list_or_empty
{
TransactionStmt *n = makeNode(TransactionStmt);
n->kind = TRANS_STMT_START;
n->options = $3;
- n->wait = $4;
$$ = (Node *)n;
}
| COMMIT opt_transaction opt_transaction_chain
| BY VALUE_P
;
-/*
- * WAIT FOR clause of BEGIN and START TRANSACTION statements
- */
-wait_for:
- WAIT FOR LSN Sconst wait_time
- {
- WaitClause *n = makeNode(WaitClause);
- n->lsn = $4;
- n->timeout = $5;
- $$ = (Node *)n;
- }
- | /* EMPTY */ { $$ = NULL; }
- ;
-
-wait_time:
- TIMEOUT Iconst { $$ = $2; }
- | /* EMPTY */ { $$ = 0; }
- ;
-
/*
* Aggregate decoration clauses
| LOCK_P
| LOCKED
| LOGGED
- | LSN
| MAPPING
| MATCH
| MATERIALIZED
| TEMPORARY
| TEXT_P
| TIES
- | TIMEOUT
| TRANSACTION
| TRANSFORM
| TRIGGER
| VIEW
| VIEWS
| VOLATILE
- | WAIT
| WHITESPACE_P
| WITHIN
| WITHOUT
#include "access/subtrans.h"
#include "access/twophase.h"
#include "commands/async.h"
-#include "commands/wait.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
size = add_size(size, BTreeShmemSize());
size = add_size(size, SyncScanShmemSize());
size = add_size(size, AsyncShmemSize());
- size = add_size(size, WaitLSNShmemSize());
#ifdef EXEC_BACKEND
size = add_size(size, ShmemBackendArraySize());
#endif
SyncScanShmemInit();
AsyncShmemInit();
- /*
- * Init array of Latches in shared memory for WAIT
- */
- WaitLSNShmemInit();
-
#ifdef EXEC_BACKEND
/*
#include "access/transam.h"
#include "access/twophase.h"
#include "access/xact.h"
-#include "commands/wait.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
AbortStrongLockAcquire();
- /* If BEGIN WAIT FOR LSN was interrupted, then stop waiting for that LSN */
- WaitLSNDelete();
-
/* Nothing to do if we weren't waiting for a lock */
if (lockAwaited == NULL)
{
#include "commands/user.h"
#include "commands/vacuum.h"
#include "commands/view.h"
-#include "commands/wait.h"
#include "miscadmin.h"
#include "parser/parse_utilcmd.h"
#include "postmaster/bgwriter.h"
case TRANS_STMT_START:
{
ListCell *lc;
- WaitClause *waitstmt = (WaitClause *) stmt->wait;
-
- /* WAIT FOR cannot be used on master */
- if (stmt->wait && !RecoveryInProgress())
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("WAIT FOR can only be "
- "used on standby")));
-
- /* If needed to WAIT FOR something but failed */
- if (stmt->wait && WaitLSNMain(waitstmt, dest) == 0)
- break;
BeginTransactionBlock();
foreach(lc, stmt->options)
* less than the specified time when WaitLatch is terminated early by a
* non-query-canceling signal such as SIGHUP.
*/
+#define GetNowFloat() ((float8) GetCurrentTimestamp() / 1000000.0)
+
endtime = GetNowFloat() + secs;
for (;;)
+++ /dev/null
-/*-------------------------------------------------------------------------
- *
- * wait.h
- * prototypes for commands/wait.c
- *
- * Copyright (c) 2020, PostgreSQL Global Development Group
- *
- * src/include/commands/wait.h
- *
- *-------------------------------------------------------------------------
- */
-#ifndef WAIT_H
-#define WAIT_H
-
-#include "tcop/dest.h"
-#include "nodes/parsenodes.h"
-
-extern bool WaitLSNUtility(XLogRecPtr lsn, const int timeout_ms);
-extern Size WaitLSNShmemSize(void);
-extern void WaitLSNShmemInit(void);
-extern void WaitLSNSetLatch(XLogRecPtr cur_lsn);
-extern XLogRecPtr WaitLSNGetMin(void);
-extern int WaitLSNMain(WaitClause *stmt, DestReceiver *dest);
-extern void WaitLSNDelete(void);
-
-#endif /* WAIT_H */
T_StartReplicationCmd,
T_TimeLineHistoryCmd,
T_SQLCmd,
- T_WaitClause,
/*
* TAGS FOR RANDOM OTHER STUFF
int location; /* token location, or -1 if unknown */
} OnConflictClause;
-/*
- * WaitClause -
- * representation of WAIT FOR clause for BEGIN and START TRANSACTION.
- */
-typedef struct WaitClause
-{
- NodeTag type;
- char *lsn; /* LSN to wait for */
- int timeout; /* Number of milliseconds to limit wait time */
-} WaitClause;
-
/*
* CommonTableExpr -
* representation of WITH list element
char *savepoint_name; /* for savepoint commands */
char *gid; /* for two-phase-commit related commands */
bool chain; /* AND CHAIN option */
- Node *wait; /* WAIT FOR clause */
} TransactionStmt;
/* ----------------------
PG_KEYWORD("lock", LOCK_P, UNRESERVED_KEYWORD)
PG_KEYWORD("locked", LOCKED, UNRESERVED_KEYWORD)
PG_KEYWORD("logged", LOGGED, UNRESERVED_KEYWORD)
-PG_KEYWORD("lsn", LSN, UNRESERVED_KEYWORD)
PG_KEYWORD("mapping", MAPPING, UNRESERVED_KEYWORD)
PG_KEYWORD("match", MATCH, UNRESERVED_KEYWORD)
PG_KEYWORD("materialized", MATERIALIZED, UNRESERVED_KEYWORD)
PG_KEYWORD("then", THEN, RESERVED_KEYWORD)
PG_KEYWORD("ties", TIES, UNRESERVED_KEYWORD)
PG_KEYWORD("time", TIME, COL_NAME_KEYWORD)
-PG_KEYWORD("timeout", TIMEOUT, UNRESERVED_KEYWORD)
PG_KEYWORD("timestamp", TIMESTAMP, COL_NAME_KEYWORD)
PG_KEYWORD("to", TO, RESERVED_KEYWORD)
PG_KEYWORD("trailing", TRAILING, RESERVED_KEYWORD)
PG_KEYWORD("view", VIEW, UNRESERVED_KEYWORD)
PG_KEYWORD("views", VIEWS, UNRESERVED_KEYWORD)
PG_KEYWORD("volatile", VOLATILE, UNRESERVED_KEYWORD)
-PG_KEYWORD("wait", WAIT, UNRESERVED_KEYWORD)
PG_KEYWORD("when", WHEN, RESERVED_KEYWORD)
PG_KEYWORD("where", WHERE, RESERVED_KEYWORD)
PG_KEYWORD("whitespace", WHITESPACE_P, UNRESERVED_KEYWORD)
extern bool TimestampTimestampTzRequiresRewrite(void);
-#define GetNowFloat() ((float8) GetCurrentTimestamp() / 1000000.0)
-
#endif /* TIMESTAMP_H */
+++ /dev/null
-# Checks for BEGIN WAIT FOR LSN
-use strict;
-use warnings;
-
-use PostgresNode;
-use TestLib;
-use Test::More tests => 8;
-
-# Initialize master node
-my $node_master = get_new_node('master');
-$node_master->init(allows_streaming => 1);
-$node_master->start;
-
-# And some content and take a backup
-$node_master->safe_psql('postgres',
- "CREATE TABLE wait_test AS SELECT generate_series(1,10) AS a");
-my $backup_name = 'my_backup';
-$node_master->backup($backup_name);
-
-# Using the backup, create a streaming standby with a 1 second delay
-my $node_standby = get_new_node('standby');
-my $delay = 1;
-$node_standby->init_from_backup($node_master, $backup_name,
- has_streaming => 1);
-$node_standby->append_conf('postgresql.conf', qq[
- recovery_min_apply_delay = '${delay}s'
-]);
-$node_standby->start;
-
-
-# Check that timeouts make us wait for the specified time (1s here)
-my $current_time = $node_standby->safe_psql('postgres', "SELECT now()");
-my $two_seconds = 2000; # in milliseconds
-my $start_time = time();
-$node_standby->safe_psql('postgres',
- "BEGIN WAIT FOR LSN '0/FFFFFFFF' TIMEOUT $two_seconds");
-my $time_waited = (time() - $start_time) * 1000; # convert to milliseconds
-ok($time_waited >= $two_seconds, "WAIT FOR TIMEOUT waits for enough time");
-
-
-# Check that timeouts let us stop waiting right away, before reaching target LSN
-$node_master->safe_psql('postgres',
- "INSERT INTO wait_test VALUES (generate_series(11, 20))");
-my $lsn1 = $node_master->safe_psql('postgres', "SELECT pg_current_wal_lsn()");
-my ($ret, $out, $err) = $node_standby->psql('postgres',
- "BEGIN WAIT FOR LSN '$lsn1' TIMEOUT 1");
-
-ok($ret == 0, "zero return value when failed to WAIT FOR LSN on standby");
-ok($err =~ /WARNING: didn't start transaction because LSN was not reached/,
- "correct error message when failed to WAIT FOR LSN on standby");
-ok($out eq "f", "if given too little wait time, WAIT doesn't reach target LSN");
-
-
-# Check that WAIT FOR works fine and reaches target LSN if given no timeout
-
-# Add data on master, memorize master's last LSN
-$node_master->safe_psql('postgres',
- "INSERT INTO wait_test VALUES (generate_series(21, 30))");
-my $lsn2 = $node_master->safe_psql('postgres', "SELECT pg_current_wal_lsn()");
-
-# Wait for it to appear on replica, memorize replica's last LSN
-$node_standby->safe_psql('postgres',
- "BEGIN WAIT FOR LSN '$lsn2'");
-my $reached_lsn = $node_standby->safe_psql('postgres',
- "SELECT pg_last_wal_replay_lsn()");
-
-# Make sure that master's and replica's LSNs are the same after WAIT
-my $compare_lsns = $node_standby->safe_psql('postgres',
- "SELECT pg_lsn_cmp('$reached_lsn'::pg_lsn, '$lsn2'::pg_lsn)");
-ok($compare_lsns eq 0,
- "standby reached the same LSN as master before starting transaction");
-
-
-# Make sure that it's not allowed to use WAIT FOR on master
-($ret, $out, $err) = $node_master->psql('postgres',
- "BEGIN WAIT FOR LSN '0/FFFFFFFF'");
-
-ok($ret != 0, "non-zero return value when trying to WAIT FOR LSN on master");
-ok($err =~ /ERROR: WAIT FOR can only be used on standby/,
- "correct error message when trying to WAIT FOR LSN on master");
-ok($out eq '', "empty output when trying to WAIT FOR LSN on master");
-
-
-$node_standby->stop;
-$node_master->stop;
WSADATA
WSANETWORKEVENTS
WSAPROTOCOL_INFO
-WaitClause
WaitEvent
WaitEventActivity
WaitEventClient
WaitEventIPC
WaitEventSet
WaitEventTimeout
-WaitLSNState
WaitPMResult
WalCloseMethod
WalLevel
projects / postgresql.git / commitdiff