From c2c9530ab726809f1ebe4904f60459b6fce34b68 Mon Sep 17 00:00:00 2001
From: John Spray <john@neon.tech>
Date: Fri, 27 Sep 2024 16:49:59 +0100
Subject: [PATCH] hack: log layer accesses

---
 pageserver/src/page_service.rs               | 1 +
 pageserver/src/tenant/storage_layer.rs       | 1 +
 pageserver/src/tenant/timeline/compaction.rs | 4 ++++
 3 files changed, 6 insertions(+)

diff --git a/pageserver/src/page_service.rs b/pageserver/src/page_service.rs
index 9261b7481d..b8bd470b61 100644
--- a/pageserver/src/page_service.rs
+++ b/pageserver/src/page_service.rs
@@ -997,6 +997,7 @@ impl PageServerHandler {
         )
         .await?;
 
+        tracing::info!("get_rel_page_at_lsn: {lsn}");
         let page = timeline
             .get_rel_page_at_lsn(req.rel, req.blkno, Version::Lsn(lsn), ctx)
             .await?;
diff --git a/pageserver/src/tenant/storage_layer.rs b/pageserver/src/tenant/storage_layer.rs
index 99bd0ece57..98c261a541 100644
--- a/pageserver/src/tenant/storage_layer.rs
+++ b/pageserver/src/tenant/storage_layer.rs
@@ -433,6 +433,7 @@ impl ReadableLayer {
         reconstruct_state: &mut ValuesReconstructState,
         ctx: &RequestContext,
     ) -> Result<(), GetVectoredError> {
+        tracing::info!("get_values_reconstruct_data: {:?}", self.id());
         match self {
             ReadableLayer::PersistentLayer(layer) => {
                 layer
diff --git a/pageserver/src/tenant/timeline/compaction.rs b/pageserver/src/tenant/timeline/compaction.rs
index 3de386a2d5..28f2529451 100644
--- a/pageserver/src/tenant/timeline/compaction.rs
+++ b/pageserver/src/tenant/timeline/compaction.rs
@@ -364,6 +364,10 @@ impl Timeline {
                 // 3. Create new image layers for partitions that have been modified
                 // "enough". Skip image layer creation if L0 compaction cannot keep up.
                 if fully_compacted {
+                    tracing::info!(
+                        "create_image_layers @ {lsn} (latest {})",
+                        self.get_last_record_lsn()
+                    );
                     let image_layers = self
                         .create_image_layers(
                             &partitioning,