From 312c62cf975ccdaa56d16d84db462facecf2726b Mon Sep 17 00:00:00 2001
From: Christian Schwarz <christian@neon.tech>
Date: Thu, 13 Jun 2024 18:15:33 +0200
Subject: [PATCH] add a reasonable assertion

---
 pageserver/src/tenant/storage_layer/delta_layer.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pageserver/src/tenant/storage_layer/delta_layer.rs b/pageserver/src/tenant/storage_layer/delta_layer.rs
index eb7cf81643..752f2f399b 100644
--- a/pageserver/src/tenant/storage_layer/delta_layer.rs
+++ b/pageserver/src/tenant/storage_layer/delta_layer.rs
@@ -822,6 +822,7 @@ impl DeltaLayerInner {
                     if entry_lsn < lsn_range.start {
                         return false;
                     }
+                    assert!(entry_lsn <= search_key.lsn(), "certain because of how backwards visit direction works");
                     offsets.push((entry_lsn, blob_ref.pos()));
 
                     !blob_ref.will_init()