diff --git a/contrib/postgres_fdw/connection.c b/contrib/postgres_fdw/connection.c
index 2326f391d3..7a8cac83cb 100644
--- a/contrib/postgres_fdw/connection.c
+++ b/contrib/postgres_fdw/connection.c
@@ -95,6 +95,13 @@ static uint32 pgfdw_we_get_result = 0;
  */
 #define CONNECTION_CLEANUP_TIMEOUT	30000
 
+/*
+ * Milliseconds to wait before issuing another cancel request.  This covers
+ * the race condition where the remote session ignored our cancel request
+ * because it arrived while idle.
+ */
+#define RE_CANCEL_TIMEOUT	1000
+
 /* Macro for constructing abort command to be sent */
 #define CONSTRUCT_ABORT_COMMAND(sql, entry, toplevel) \
 	do { \
@@ -145,6 +152,7 @@ static void pgfdw_reset_xact_state(ConnCacheEntry *entry, bool toplevel);
 static bool pgfdw_cancel_query(PGconn *conn);
 static bool pgfdw_cancel_query_begin(PGconn *conn, TimestampTz endtime);
 static bool pgfdw_cancel_query_end(PGconn *conn, TimestampTz endtime,
+								   TimestampTz recanceltime,
 								   bool consume_input);
 static bool pgfdw_exec_cleanup_query(PGconn *conn, const char *query,
 									 bool ignore_errors);
@@ -154,6 +162,7 @@ static bool pgfdw_exec_cleanup_query_end(PGconn *conn, const char *query,
 										 bool consume_input,
 										 bool ignore_errors);
 static bool pgfdw_get_cleanup_result(PGconn *conn, TimestampTz endtime,
+									 TimestampTz recanceltime,
 									 PGresult **result, bool *timed_out);
 static void pgfdw_abort_cleanup(ConnCacheEntry *entry, bool toplevel);
 static bool pgfdw_abort_cleanup_begin(ConnCacheEntry *entry, bool toplevel,
@@ -1322,18 +1331,25 @@ pgfdw_reset_xact_state(ConnCacheEntry *entry, bool toplevel)
 static bool
 pgfdw_cancel_query(PGconn *conn)
 {
+	TimestampTz now = GetCurrentTimestamp();
 	TimestampTz endtime;
+	TimestampTz recanceltime;
 
 	/*
 	 * If it takes too long to cancel the query and discard the result, assume
 	 * the connection is dead.
 	 */
-	endtime = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
-										  CONNECTION_CLEANUP_TIMEOUT);
+	endtime = TimestampTzPlusMilliseconds(now, CONNECTION_CLEANUP_TIMEOUT);
+
+	/*
+	 * Also, lose patience and re-issue the cancel request after a little bit.
+	 * (This serves to close some race conditions.)
+	 */
+	recanceltime = TimestampTzPlusMilliseconds(now, RE_CANCEL_TIMEOUT);
 
 	if (!pgfdw_cancel_query_begin(conn, endtime))
 		return false;
-	return pgfdw_cancel_query_end(conn, endtime, false);
+	return pgfdw_cancel_query_end(conn, endtime, recanceltime, false);
 }
 
 /*
@@ -1359,9 +1375,10 @@ pgfdw_cancel_query_begin(PGconn *conn, TimestampTz endtime)
 }
 
 static bool
-pgfdw_cancel_query_end(PGconn *conn, TimestampTz endtime, bool consume_input)
+pgfdw_cancel_query_end(PGconn *conn, TimestampTz endtime,
+					   TimestampTz recanceltime, bool consume_input)
 {
-	PGresult   *result = NULL;
+	PGresult   *result;
 	bool		timed_out;
 
 	/*
@@ -1380,7 +1397,8 @@ pgfdw_cancel_query_end(PGconn *conn, TimestampTz endtime, bool consume_input)
 	}
 
 	/* Get and discard the result of the query. */
-	if (pgfdw_get_cleanup_result(conn, endtime, &result, &timed_out))
+	if (pgfdw_get_cleanup_result(conn, endtime, recanceltime,
+								 &result, &timed_out))
 	{
 		if (timed_out)
 			ereport(WARNING,
@@ -1453,7 +1471,7 @@ pgfdw_exec_cleanup_query_end(PGconn *conn, const char *query,
 							 TimestampTz endtime, bool consume_input,
 							 bool ignore_errors)
 {
-	PGresult   *result = NULL;
+	PGresult   *result;
 	bool		timed_out;
 
 	Assert(query != NULL);
@@ -1471,7 +1489,7 @@ pgfdw_exec_cleanup_query_end(PGconn *conn, const char *query,
 	}
 
 	/* Get the result of the query. */
-	if (pgfdw_get_cleanup_result(conn, endtime, &result, &timed_out))
+	if (pgfdw_get_cleanup_result(conn, endtime, endtime, &result, &timed_out))
 	{
 		if (timed_out)
 			ereport(WARNING,
@@ -1495,28 +1513,36 @@ pgfdw_exec_cleanup_query_end(PGconn *conn, const char *query,
 }
 
 /*
- * Get, during abort cleanup, the result of a query that is in progress.  This
- * might be a query that is being interrupted by transaction abort, or it might
- * be a query that was initiated as part of transaction abort to get the remote
- * side back to the appropriate state.
+ * Get, during abort cleanup, the result of a query that is in progress.
+ * This might be a query that is being interrupted by a cancel request or by
+ * transaction abort, or it might be a query that was initiated as part of
+ * transaction abort to get the remote side back to the appropriate state.
  *
  * endtime is the time at which we should give up and assume the remote
- * side is dead.  Returns true if the timeout expired or connection trouble
- * occurred, false otherwise.  Sets *result except in case of a timeout.
- * Sets timed_out to true only when the timeout expired.
+ * side is dead.  recanceltime is the time at which we should issue a fresh
+ * cancel request (pass the same value as endtime if this is not wanted).
+ *
+ * Returns true if the timeout expired or connection trouble occurred,
+ * false otherwise.  Sets *result except in case of a true result.
+ * Sets *timed_out to true only when the timeout expired.
  */
 static bool
-pgfdw_get_cleanup_result(PGconn *conn, TimestampTz endtime, PGresult **result,
+pgfdw_get_cleanup_result(PGconn *conn, TimestampTz endtime,
+						 TimestampTz recanceltime,
+						 PGresult **result,
 						 bool *timed_out)
 {
 	volatile bool failed = false;
 	PGresult   *volatile last_res = NULL;
 
+	*result = NULL;
 	*timed_out = false;
 
 	/* In what follows, do not leak any PGresults on an error. */
 	PG_TRY();
 	{
+		int			canceldelta = RE_CANCEL_TIMEOUT * 2;
+
 		for (;;)
 		{
 			PGresult   *res;
@@ -1527,8 +1553,33 @@ pgfdw_get_cleanup_result(PGconn *conn, TimestampTz endtime, PGresult **result,
 				TimestampTz now = GetCurrentTimestamp();
 				long		cur_timeout;
 
+				/* If timeout has expired, give up. */
+				if (now >= endtime)
+				{
+					*timed_out = true;
+					failed = true;
+					goto exit;
+				}
+
+				/* If we need to re-issue the cancel request, do that. */
+				if (now >= recanceltime)
+				{
+					/* We ignore failure to issue the repeated request. */
+					(void) libpqsrv_cancel(conn, endtime);
+
+					/* Recompute "now" in case that took measurable time. */
+					now = GetCurrentTimestamp();
+
+					/* Adjust re-cancel timeout in increasing steps. */
+					recanceltime = TimestampTzPlusMilliseconds(now,
+															   canceldelta);
+					canceldelta += canceldelta;
+				}
+
 				/* If timeout has expired, give up, else get sleep time. */
-				cur_timeout = TimestampDifferenceMilliseconds(now, endtime);
+				cur_timeout = TimestampDifferenceMilliseconds(now,
+															  Min(endtime,
+																  recanceltime));
 				if (cur_timeout <= 0)
 				{
 					*timed_out = true;
@@ -1849,7 +1900,9 @@ pgfdw_finish_abort_cleanup(List *pending_entries, List *cancel_requested,
 		foreach(lc, cancel_requested)
 		{
 			ConnCacheEntry *entry = (ConnCacheEntry *) lfirst(lc);
+			TimestampTz now = GetCurrentTimestamp();
 			TimestampTz endtime;
+			TimestampTz recanceltime;
 			char		sql[100];
 
 			Assert(entry->changing_xact_state);
@@ -1863,10 +1916,13 @@ pgfdw_finish_abort_cleanup(List *pending_entries, List *cancel_requested,
 			 * remaining entries in the list, leading to slamming that entry's
 			 * connection shut.
 			 */
-			endtime = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
+			endtime = TimestampTzPlusMilliseconds(now,
 												  CONNECTION_CLEANUP_TIMEOUT);
+			recanceltime = TimestampTzPlusMilliseconds(now,
+													   RE_CANCEL_TIMEOUT);
 
-			if (!pgfdw_cancel_query_end(entry->conn, endtime, true))
+			if (!pgfdw_cancel_query_end(entry->conn, endtime,
+										recanceltime, true))
 			{
 				/* Unable to cancel running query */
 				pgfdw_reset_xact_state(entry, toplevel);