From aaf8617fcc76b41881e42a1bcaf215bf01130e0e Mon Sep 17 00:00:00 2001
From: Konstantin Knizhnik <knizhnik@garret.ru>
Date: Tue, 16 May 2023 09:53:45 +0300
Subject: [PATCH] Log detection of duplicate layer

---
 pageserver/src/tenant/timeline.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pageserver/src/tenant/timeline.rs b/pageserver/src/tenant/timeline.rs
index 30f8f49574..36dc6d9282 100644
--- a/pageserver/src/tenant/timeline.rs
+++ b/pageserver/src/tenant/timeline.rs
@@ -3410,6 +3410,13 @@ impl Timeline {
                             &w.lsn_range(),
                             false, // not an image layer
                         ) {
+                            info!(
+                                "Skip generation of duplicate layer {}_{}__{}_{}",
+                                w.key_start(),
+                                end_key,
+                                w.lsn_range().start,
+                                w.lsn_range().end
+                            );
                             drop(w);
                         } else {
                             let new_layer = w.finish(end_key)?;