From 45d366063000e561543054fe81ff98d761d25983 Mon Sep 17 00:00:00 2001
From: Konstantin Knizhnik <knizhnik@neon.tech>
Date: Thu, 3 Oct 2024 18:27:28 +0300
Subject: [PATCH] Use GetRedoStartLsn() instead of walproposer epoch start LSN
 for on-demand WAL download

---
 pgxn/neon/walsender_hooks.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/pgxn/neon/walsender_hooks.c b/pgxn/neon/walsender_hooks.c
index 575dddef02..75ac1c8efe 100644
--- a/pgxn/neon/walsender_hooks.c
+++ b/pgxn/neon/walsender_hooks.c
@@ -191,13 +191,7 @@ NeonOnDemandXLogReaderRoutines(XLogReaderRoutine *xlr)
 
 	if (!wal_reader)
 	{
-		XLogRecPtr	epochStartLsn = pg_atomic_read_u64(&GetWalpropShmemState()->propEpochStartLsn);
-
-		if (epochStartLsn == 0)
-		{
-			elog(ERROR, "Unable to start walsender when propEpochStartLsn is 0!");
-		}
-		wal_reader = NeonWALReaderAllocate(wal_segment_size, epochStartLsn, "[walsender] ");
+		wal_reader = NeonWALReaderAllocate(wal_segment_size, GetRedoStartLsn(), "[walsender] ");
 	}
 	xlr->page_read = NeonWALPageRead;
 	xlr->segment_open = NeonWALReadSegmentOpen;