Ability to advance replication slots

Ability to advance both physical and logical replication slots using a
new user function pg_replication_slot_advance().

For logical advance that means records are consumed as fast as possible
and changes are not given to output plugin for sending. Makes 2nd phase
(after we reached SNAPBUILD_FULL_SNAPSHOT) of replication slot creation
faster, especially when there are big transactions as the reorder buffer
does not have to deal with data changes and does not have to spill to
disk.

Author: Petr Jelinek
Reviewed-by: Simon Riggs

contrib/test_decoding/expected/slot.out

@@ -92,6 +92,36 @@ SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL, 'in
  COMMIT
 (3 rows)
 
+INSERT INTO replication_example(somedata, text) VALUES (1, 4);
+INSERT INTO replication_example(somedata, text) VALUES (1, 5);
+SELECT pg_current_wal_lsn() AS wal_lsn \gset
+INSERT INTO replication_example(somedata, text) VALUES (1, 6);
+SELECT end_lsn FROM pg_replication_slot_advance('regression_slot1', :'wal_lsn') \gset
+SELECT slot_name FROM pg_replication_slot_advance('regression_slot2', pg_current_wal_lsn());
+    slot_name     
+------------------
+ regression_slot2
+(1 row)
+
+SELECT :'wal_lsn' = :'end_lsn';
+ ?column? 
+----------
+ t
+(1 row)
+
+SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+                                                  data                                                   
+---------------------------------------------------------------------------------------------------------
+ BEGIN
+ table public.replication_example: INSERT: id[integer]:6 somedata[integer]:1 text[character varying]:'6'
+ COMMIT
+(3 rows)
+
+SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+ data 
+------
+(0 rows)
+
 DROP TABLE replication_example;
 -- error
 SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot1', 'test_decoding', true);

contrib/test_decoding/sql/slot.sql

@@ -45,6 +45,21 @@ INSERT INTO replication_example(somedata, text) VALUES (1, 3);
 SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
 SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
 
+INSERT INTO replication_example(somedata, text) VALUES (1, 4);
+INSERT INTO replication_example(somedata, text) VALUES (1, 5);
+
+SELECT pg_current_wal_lsn() AS wal_lsn \gset
+
+INSERT INTO replication_example(somedata, text) VALUES (1, 6);
+
+SELECT end_lsn FROM pg_replication_slot_advance('regression_slot1', :'wal_lsn') \gset
+SELECT slot_name FROM pg_replication_slot_advance('regression_slot2', pg_current_wal_lsn());
+
+SELECT :'wal_lsn' = :'end_lsn';
+
+SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+
 DROP TABLE replication_example;
 
 -- error

doc/src/sgml/func.sgml

@@ -19155,6 +19155,25 @@ postgres=# SELECT * FROM pg_walfile_name_offset(pg_stop_backup());
        </entry>
       </row>
 
+      <row>
+       <entry>
+        <indexterm>
+         <primary>pg_replication_slot_advance</primary>
+        </indexterm>
+        <literal><function>pg_replication_slot_advance(<parameter>slot_name</parameter> <type>name</type>, <parameter>upto_lsn</parameter> <type>pg_lsn</type>)</function></literal>
+       </entry>
+       <entry>
+        (<parameter>slot_name</parameter> <type>name</type>, <parameter>end_lsn</parameter> <type>pg_lsn</type>)
+        <type>bool</type>
+       </entry>
+       <entry>
+        Advances the current confirmed position of a replication slot named
+        <parameter>slot_name</parameter>. The slot will not be moved backwards,
+        and it will not be moved beyond the current insert location.  Returns
+        name of the slot and real position to which it was advanced to.
+       </entry>
+      </row>
+
       <row>
        <entry id="pg-replication-origin-create">
         <indexterm>

src/backend/replication/logical/decode.c

@@ -88,6 +88,9 @@ static void DecodeXLogTuple(char *data, Size len, ReorderBufferTupleBuf *tup);
  * call ReorderBufferProcessXid for each record type by default, because
  * e.g. empty xacts can be handled more efficiently if there's no previous
  * state for them.
+ *
+ * We also support the ability to fast forward thru records, skipping some
+ * record types completely - see individual record types for details.
  */
 void
 LogicalDecodingProcessRecord(LogicalDecodingContext *ctx, XLogReaderState *record)
@@ -332,8 +335,10 @@ DecodeStandbyOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 				xl_invalidations *invalidations =
 				(xl_invalidations *) XLogRecGetData(r);
 
-				ReorderBufferImmediateInvalidation(
-												   ctx->reorder, invalidations->nmsgs, invalidations->msgs);
+				if (!ctx->fast_forward)
+					ReorderBufferImmediateInvalidation(ctx->reorder,
+													   invalidations->nmsgs,
+													   invalidations->msgs);
 			}
 			break;
 		default:
@@ -353,14 +358,19 @@ DecodeHeap2Op(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 
 	ReorderBufferProcessXid(ctx->reorder, xid, buf->origptr);
 
-	/* no point in doing anything yet */
-	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT)
+	/*
+	 * If we don't have snapshot or we are just fast-forwarding, there is no
+	 * point in decoding changes.
+	 */
+	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT ||
+		ctx->fast_forward)
 		return;
 
 	switch (info)
 	{
 		case XLOG_HEAP2_MULTI_INSERT:
-			if (SnapBuildProcessChange(builder, xid, buf->origptr))
+			if (!ctx->fast_forward &&
+				SnapBuildProcessChange(builder, xid, buf->origptr))
 				DecodeMultiInsert(ctx, buf);
 			break;
 		case XLOG_HEAP2_NEW_CID:
@@ -408,8 +418,12 @@ DecodeHeapOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 
 	ReorderBufferProcessXid(ctx->reorder, xid, buf->origptr);
 
-	/* no point in doing anything yet */
-	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT)
+	/*
+	 * If we don't have snapshot or we are just fast-forwarding, there is no
+	 * point in decoding data changes.
+	 */
+	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT ||
+		ctx->fast_forward)
 		return;
 
 	switch (info)
@@ -501,8 +515,12 @@ DecodeLogicalMsgOp(LogicalDecodingContext *ctx, XLogRecordBuffer *buf)
 
 	ReorderBufferProcessXid(ctx->reorder, XLogRecGetXid(r), buf->origptr);
 
-	/* No point in doing anything yet. */
-	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT)
+	/*
+	 * If we don't have snapshot or we are just fast-forwarding, there is no
+	 * point in decoding messages.
+	 */
+	if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT ||
+		ctx->fast_forward)
 		return;
 
 	message = (xl_logical_message *) XLogRecGetData(r);
@@ -554,8 +572,9 @@ DecodeCommit(LogicalDecodingContext *ctx, XLogRecordBuffer *buf,
 	 */
 	if (parsed->nmsgs > 0)
 	{
-		ReorderBufferAddInvalidations(ctx->reorder, xid, buf->origptr,
-									  parsed->nmsgs, parsed->msgs);
+		if (!ctx->fast_forward)
+			ReorderBufferAddInvalidations(ctx->reorder, xid, buf->origptr,
+										  parsed->nmsgs, parsed->msgs);
 		ReorderBufferXidSetCatalogChanges(ctx->reorder, xid, buf->origptr);
 	}
 
@@ -574,6 +593,7 @@ DecodeCommit(LogicalDecodingContext *ctx, XLogRecordBuffer *buf,
 	 *	  are restarting or if we haven't assembled a consistent snapshot yet.
 	 * 2) The transaction happened in another database.
 	 * 3) The output plugin is not interested in the origin.
+	 * 4) We are doing fast-forwarding
 	 *
 	 * We can't just use ReorderBufferAbort() here, because we need to execute
 	 * the transaction's invalidations.  This currently won't be needed if
@@ -589,7 +609,7 @@ DecodeCommit(LogicalDecodingContext *ctx, XLogRecordBuffer *buf,
 	 */
 	if (SnapBuildXactNeedsSkip(ctx->snapshot_builder, buf->origptr) ||
 		(parsed->dbId != InvalidOid && parsed->dbId != ctx->slot->data.database) ||
-		FilterByOrigin(ctx, origin_id))
+		ctx->fast_forward || FilterByOrigin(ctx, origin_id))
 	{
 		for (i = 0; i < parsed->nsubxacts; i++)
 		{

src/backend/replication/logical/logical.c

@@ -115,6 +115,7 @@ StartupDecodingContext(List *output_plugin_options,
 					   XLogRecPtr start_lsn,
 					   TransactionId xmin_horizon,
 					   bool need_full_snapshot,
+					   bool fast_forward,
 					   XLogPageReadCB read_page,
 					   LogicalOutputPluginWriterPrepareWrite prepare_write,
 					   LogicalOutputPluginWriterWrite do_write,
@@ -140,7 +141,8 @@ StartupDecodingContext(List *output_plugin_options,
 	 * (re-)load output plugins, so we detect a bad (removed) output plugin
 	 * now.
 	 */
-	LoadOutputPlugin(&ctx->callbacks, NameStr(slot->data.plugin));
+	if (!fast_forward)
+		LoadOutputPlugin(&ctx->callbacks, NameStr(slot->data.plugin));
 
 	/*
 	 * Now that the slot's xmin has been set, we can announce ourselves as a
@@ -191,6 +193,8 @@ StartupDecodingContext(List *output_plugin_options,
 
 	ctx->output_plugin_options = output_plugin_options;
 
+	ctx->fast_forward = fast_forward;
+
 	MemoryContextSwitchTo(old_context);
 
 	return ctx;
@@ -303,8 +307,9 @@ CreateInitDecodingContext(char *plugin,
 	ReplicationSlotSave();
 
 	ctx = StartupDecodingContext(NIL, InvalidXLogRecPtr, xmin_horizon,
-								 need_full_snapshot, read_page, prepare_write,
-								 do_write, update_progress);
+								 need_full_snapshot, true,
+								 read_page, prepare_write, do_write,
+								 update_progress);
 
 	/* call output plugin initialization callback */
 	old_context = MemoryContextSwitchTo(ctx->context);
@@ -342,6 +347,7 @@ CreateInitDecodingContext(char *plugin,
 LogicalDecodingContext *
 CreateDecodingContext(XLogRecPtr start_lsn,
 					  List *output_plugin_options,
+					  bool fast_forward,
 					  XLogPageReadCB read_page,
 					  LogicalOutputPluginWriterPrepareWrite prepare_write,
 					  LogicalOutputPluginWriterWrite do_write,
@@ -395,8 +401,8 @@ CreateDecodingContext(XLogRecPtr start_lsn,
 
 	ctx = StartupDecodingContext(output_plugin_options,
 								 start_lsn, InvalidTransactionId, false,
-								 read_page, prepare_write, do_write,
-								 update_progress);
+								 fast_forward, read_page, prepare_write,
+								 do_write, update_progress);
 
 	/* call output plugin initialization callback */
 	old_context = MemoryContextSwitchTo(ctx->context);
@@ -573,6 +579,8 @@ startup_cb_wrapper(LogicalDecodingContext *ctx, OutputPluginOptions *opt, bool i
 	LogicalErrorCallbackState state;
 	ErrorContextCallback errcallback;
 
+	Assert(!ctx->fast_forward);
+
 	/* Push callback + info on the error context stack */
 	state.ctx = ctx;
 	state.callback_name = "startup";
@@ -598,6 +606,8 @@ shutdown_cb_wrapper(LogicalDecodingContext *ctx)
 	LogicalErrorCallbackState state;
 	ErrorContextCallback errcallback;
 
+	Assert(!ctx->fast_forward);
+
 	/* Push callback + info on the error context stack */
 	state.ctx = ctx;
 	state.callback_name = "shutdown";
@@ -629,6 +639,8 @@ begin_cb_wrapper(ReorderBuffer *cache, ReorderBufferTXN *txn)
 	LogicalErrorCallbackState state;
 	ErrorContextCallback errcallback;
 
+	Assert(!ctx->fast_forward);
+
 	/* Push callback + info on the error context stack */
 	state.ctx = ctx;
 	state.callback_name = "begin";
@@ -658,6 +670,8 @@ commit_cb_wrapper(ReorderBuffer *cache, ReorderBufferTXN *txn,
 	LogicalErrorCallbackState state;
 	ErrorContextCallback errcallback;
 
+	Assert(!ctx->fast_forward);
+
 	/* Push callback + info on the error context stack */
 	state.ctx = ctx;
 	state.callback_name = "commit";
@@ -687,6 +701,8 @@ change_cb_wrapper(ReorderBuffer *cache, ReorderBufferTXN *txn,
 	LogicalErrorCallbackState state;
 	ErrorContextCallback errcallback;
 
+	Assert(!ctx->fast_forward);
+
 	/* Push callback + info on the error context stack */
 	state.ctx = ctx;
 	state.callback_name = "change";
@@ -721,6 +737,8 @@ filter_by_origin_cb_wrapper(LogicalDecodingContext *ctx, RepOriginId origin_id)
 	ErrorContextCallback errcallback;
 	bool		ret;
 
+	Assert(!ctx->fast_forward);
+
 	/* Push callback + info on the error context stack */
 	state.ctx = ctx;
 	state.callback_name = "filter_by_origin";
@@ -751,6 +769,8 @@ message_cb_wrapper(ReorderBuffer *cache, ReorderBufferTXN *txn,
 	LogicalErrorCallbackState state;
 	ErrorContextCallback errcallback;
 
+	Assert(!ctx->fast_forward);
+
 	if (ctx->callbacks.message_cb == NULL)
 		return;
 

src/backend/replication/logical/logicalfuncs.c

@@ -251,6 +251,7 @@ pg_logical_slot_get_changes_guts(FunctionCallInfo fcinfo, bool confirm, bool bin
 		/* restart at slot's confirmed_flush */
 		ctx = CreateDecodingContext(InvalidXLogRecPtr,
 									options,
+									false,
 									logical_read_local_xlog_page,
 									LogicalOutputPrepareWrite,
 									LogicalOutputWrite, NULL);

src/backend/replication/slotfuncs.c

@@ -17,11 +17,14 @@
 #include "miscadmin.h"
 
 #include "access/htup_details.h"
+#include "replication/decode.h"
 #include "replication/slot.h"
 #include "replication/logical.h"
 #include "replication/logicalfuncs.h"
 #include "utils/builtins.h"
+#include "utils/inval.h"
 #include "utils/pg_lsn.h"
+#include "utils/resowner.h"
 
 static void
 check_permissions(void)
@@ -312,3 +315,200 @@ pg_get_replication_slots(PG_FUNCTION_ARGS)
 
 	return (Datum) 0;
 }
+
+/*
+ * Helper function for advancing physical replication slot forward.
+ */
+static XLogRecPtr
+pg_physical_replication_slot_advance(XLogRecPtr startlsn, XLogRecPtr moveto)
+{
+	XLogRecPtr	retlsn = InvalidXLogRecPtr;
+
+	SpinLockAcquire(&MyReplicationSlot->mutex);
+	if (MyReplicationSlot->data.restart_lsn < moveto)
+	{
+		MyReplicationSlot->data.restart_lsn = moveto;
+		retlsn = moveto;
+	}
+	SpinLockRelease(&MyReplicationSlot->mutex);
+
+	return retlsn;
+}
+
+/*
+ * Helper function for advancing logical replication slot forward.
+ */
+static XLogRecPtr
+pg_logical_replication_slot_advance(XLogRecPtr startlsn, XLogRecPtr moveto)
+{
+	LogicalDecodingContext *ctx;
+	ResourceOwner	old_resowner = CurrentResourceOwner;
+	XLogRecPtr		retlsn = InvalidXLogRecPtr;
+
+	PG_TRY();
+	{
+		/* restart at slot's confirmed_flush */
+		ctx = CreateDecodingContext(InvalidXLogRecPtr,
+									NIL,
+									true,
+									logical_read_local_xlog_page,
+									NULL, NULL, NULL);
+
+		CurrentResourceOwner = ResourceOwnerCreate(CurrentResourceOwner,
+												   "logical decoding");
+
+		/* invalidate non-timetravel entries */
+		InvalidateSystemCaches();
+
+		/* Decode until we run out of records */
+		while ((startlsn != InvalidXLogRecPtr && startlsn < moveto) ||
+			   (ctx->reader->EndRecPtr != InvalidXLogRecPtr && ctx->reader->EndRecPtr < moveto))
+		{
+			XLogRecord *record;
+			char	   *errm = NULL;
+
+			record = XLogReadRecord(ctx->reader, startlsn, &errm);
+			if (errm)
+				elog(ERROR, "%s", errm);
+
+			/*
+			 * Now that we've set up the xlog reader state, subsequent calls
+			 * pass InvalidXLogRecPtr to say "continue from last record"
+			 */
+			startlsn = InvalidXLogRecPtr;
+
+			/*
+			 * The {begin_txn,change,commit_txn}_wrapper callbacks above will
+			 * store the description into our tuplestore.
+			 */
+			if (record != NULL)
+				LogicalDecodingProcessRecord(ctx, ctx->reader);
+
+			/* check limits */
+			if (moveto <= ctx->reader->EndRecPtr)
+				break;
+
+			CHECK_FOR_INTERRUPTS();
+		}
+
+		CurrentResourceOwner = old_resowner;
+
+		if (ctx->reader->EndRecPtr != InvalidXLogRecPtr)
+		{
+			LogicalConfirmReceivedLocation(moveto);
+
+			/*
+			 * If only the confirmed_flush_lsn has changed the slot won't get
+			 * marked as dirty by the above. Callers on the walsender
+			 * interface are expected to keep track of their own progress and
+			 * don't need it written out. But SQL-interface users cannot
+			 * specify their own start positions and it's harder for them to
+			 * keep track of their progress, so we should make more of an
+			 * effort to save it for them.
+			 *
+			 * Dirty the slot so it's written out at the next checkpoint.
+			 * We'll still lose its position on crash, as documented, but it's
+			 * better than always losing the position even on clean restart.
+			 */
+			ReplicationSlotMarkDirty();
+		}
+
+		retlsn = MyReplicationSlot->data.confirmed_flush;
+
+		/* free context, call shutdown callback */
+		FreeDecodingContext(ctx);
+
+		InvalidateSystemCaches();
+	}
+	PG_CATCH();
+	{
+		/* clear all timetravel entries */
+		InvalidateSystemCaches();
+
+		PG_RE_THROW();
+	}
+	PG_END_TRY();
+
+	return retlsn;
+}
+
+/*
+ * SQL function for moving the position in a replication slot.
+ */
+Datum
+pg_replication_slot_advance(PG_FUNCTION_ARGS)
+{
+	Name		slotname = PG_GETARG_NAME(0);
+	XLogRecPtr	moveto = PG_GETARG_LSN(1);
+	XLogRecPtr	endlsn;
+	XLogRecPtr	startlsn;
+	TupleDesc	tupdesc;
+	Datum		values[2];
+	bool		nulls[2];
+	HeapTuple	tuple;
+	Datum		result;
+
+	Assert(!MyReplicationSlot);
+
+	check_permissions();
+
+	if (XLogRecPtrIsInvalid(moveto))
+		ereport(ERROR,
+				(errmsg("invalid target wal lsn")));
+
+	/* Build a tuple descriptor for our result type */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+
+	/*
+	 * We can't move slot past what's been flushed/replayed so clamp the
+	 * target possition accordingly.
+	 */
+	if (!RecoveryInProgress())
+		moveto = Min(moveto, GetFlushRecPtr());
+	else
+		moveto = Min(moveto, GetXLogReplayRecPtr(&ThisTimeLineID));
+
+	/* Acquire the slot so we "own" it */
+	ReplicationSlotAcquire(NameStr(*slotname), true);
+
+	startlsn = MyReplicationSlot->data.confirmed_flush;
+	if (moveto < startlsn)
+	{
+		ReplicationSlotRelease();
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("cannot move slot to %X/%X, minimum is %X/%X",
+						(uint32) (moveto >> 32), (uint32) moveto,
+						(uint32) (MyReplicationSlot->data.confirmed_flush >> 32),
+						(uint32) (MyReplicationSlot->data.confirmed_flush))));
+	}
+
+	if (OidIsValid(MyReplicationSlot->data.database))
+		endlsn = pg_logical_replication_slot_advance(startlsn, moveto);
+	else
+		endlsn = pg_physical_replication_slot_advance(startlsn, moveto);
+
+	values[0] = NameGetDatum(&MyReplicationSlot->data.name);
+	nulls[0] = false;
+
+	/* Update the on disk state when lsn was updated. */
+	if (XLogRecPtrIsInvalid(endlsn))
+	{
+		ReplicationSlotMarkDirty();
+		ReplicationSlotsComputeRequiredXmin(false);
+		ReplicationSlotsComputeRequiredLSN();
+		ReplicationSlotSave();
+	}
+
+	ReplicationSlotRelease();
+
+	/* Return the reached position. */
+	values[1] = LSNGetDatum(endlsn);
+	nulls[1] = false;
+
+	tuple = heap_form_tuple(tupdesc, values, nulls);
+	result = HeapTupleGetDatum(tuple);
+
+	PG_RETURN_DATUM(result);
+}

src/backend/replication/walsender.c

@@ -1075,6 +1075,7 @@ StartLogicalReplication(StartReplicationCmd *cmd)
 	 * to be shipped from that position.
 	 */
 	logical_decoding_ctx = CreateDecodingContext(cmd->startpoint, cmd->options,
+												 false,
 												 logical_read_xlog_page,
 												 WalSndPrepareWrite,
 												 WalSndWriteData,

src/include/catalog/pg_proc.h

@@ -5357,6 +5357,8 @@ DATA(insert OID = 3784 (  pg_logical_slot_peek_changes PGNSP PGUID 12 1000 1000
 DESCR("peek at changes from replication slot");
 DATA(insert OID = 3785 (  pg_logical_slot_peek_binary_changes PGNSP PGUID 12 1000 1000 25 0 f f f f f t v u 4 0 2249 "19 3220 23 1009" "{19,3220,23,1009,3220,28,17}" "{i,i,i,v,o,o,o}" "{slot_name,upto_lsn,upto_nchanges,options,lsn,xid,data}" _null_ _null_ pg_logical_slot_peek_binary_changes _null_ _null_ _null_ ));
 DESCR("peek at binary changes from replication slot");
+DATA(insert OID = 3878 (  pg_replication_slot_advance PGNSP PGUID 12 1 0 0 0 f f f f t f v u 2 0 2249 "19 3220" "{19,3220,19,3220}" "{i,i,o,o}" "{slot_name,upto_lsn,slot_name,end_lsn}" _null_ _null_ pg_replication_slot_advance _null_ _null_ _null_ ));
+DESCR("advance logical replication slot");
 DATA(insert OID = 3577 (  pg_logical_emit_message PGNSP PGUID 12 1 0 0 0 f f f f t f v u 3 0 3220 "16 25 25" _null_ _null_ _null_ _null_ _null_ pg_logical_emit_message_text _null_ _null_ _null_ ));
 DESCR("emit a textual logical decoding message");
 DATA(insert OID = 3578 (  pg_logical_emit_message PGNSP PGUID 12 1 0 0 0 f f f f t f v u 3 0 3220 "16 25 17" _null_ _null_ _null_ _null_ _null_ pg_logical_emit_message_bytea _null_ _null_ _null_ ));

src/include/replication/logical.h

@@ -45,6 +45,13 @@ typedef struct LogicalDecodingContext
 	struct ReorderBuffer *reorder;
 	struct SnapBuild *snapshot_builder;
 
+	/*
+	 * Marks the logical decoding context as fast forward decoding one.
+	 * Such a context does not have plugin loaded so most of the the following
+	 * properties are unused.
+	 */
+	bool fast_forward;
+
 	OutputPluginCallbacks callbacks;
 	OutputPluginOptions options;
 
@@ -97,6 +104,7 @@ extern LogicalDecodingContext *CreateInitDecodingContext(char *plugin,
 extern LogicalDecodingContext *CreateDecodingContext(
 					  XLogRecPtr start_lsn,
 					  List *output_plugin_options,
+					  bool fast_forward,
 					  XLogPageReadCB read_page,
 					  LogicalOutputPluginWriterPrepareWrite prepare_write,
 					  LogicalOutputPluginWriterWrite do_write,