From b8fda9d7300c832189ce28b09716b2d887ad191a Mon Sep 17 00:00:00 2001
From: Michael Vines <mvines@gmail.com>
Date: Wed, 25 Mar 2020 21:41:50 -0700
Subject: [PATCH] Log how much data the ledger holds before processing it
 (#9079)

---
 ledger/src/blockstore.rs           | 2 +-
 ledger/src/blockstore_processor.rs | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/ledger/src/blockstore.rs b/ledger/src/blockstore.rs
index 085d024da8..366fec4d8d 100644
--- a/ledger/src/blockstore.rs
+++ b/ledger/src/blockstore.rs
@@ -433,7 +433,7 @@ impl Blockstore {
     pub fn slot_meta_iterator<'a>(
         &'a self,
         slot: Slot,
-    ) -> Result<impl Iterator<Item = (u64, SlotMeta)> + 'a> {
+    ) -> Result<impl Iterator<Item = (Slot, SlotMeta)> + 'a> {
         let meta_iter = self
             .db
             .iter::<cf::SlotMeta>(IteratorMode::From(slot, IteratorDirection::Forward))?;
diff --git a/ledger/src/blockstore_processor.rs b/ledger/src/blockstore_processor.rs
index f74bcd0c85..403d5c69cc 100644
--- a/ledger/src/blockstore_processor.rs
+++ b/ledger/src/blockstore_processor.rs
@@ -310,7 +310,7 @@ pub fn process_blockstore_from_root(
     opts: &ProcessOptions,
     recyclers: &VerifyRecyclers,
 ) -> BlockstoreProcessorResult {
-    info!("processing ledger from root slot {}...", bank.slot());
+    info!("processing ledger from slot {}...", bank.slot());
     let allocated = thread_mem_usage::Allocatedp::default();
     let initial_allocation = allocated.get();
 
@@ -345,6 +345,12 @@ pub fn process_blockstore_from_root(
         .set_roots(&[start_slot])
         .expect("Couldn't set root slot on startup");
 
+    if let Ok(metas) = blockstore.slot_meta_iterator(start_slot) {
+        if let Some((slot, _meta)) = metas.last() {
+            info!("ledger holds data through slot {}", slot);
+        }
+    }
+
     let meta = blockstore.meta(start_slot).unwrap();
 
     // Iterate and replay slots from blockstore starting from `start_slot`