add merkle root meta column to blockstore

ledger/src/blockstore.rs

@@ -215,6 +215,7 @@ pub struct Blockstore {
     bank_hash_cf: LedgerColumn<cf::BankHash>,
     optimistic_slots_cf: LedgerColumn<cf::OptimisticSlots>,
     max_root: AtomicU64,
+    merkle_root_meta_cf: LedgerColumn<cf::MerkleRootMeta>,
     insert_shreds_lock: Mutex<()>,
     new_shreds_signals: Mutex<Vec<Sender<bool>>>,
     completed_slots_senders: Mutex<Vec<CompletedSlotsSender>>,
@@ -315,6 +316,7 @@ impl Blockstore {
         let program_costs_cf = db.column();
         let bank_hash_cf = db.column();
         let optimistic_slots_cf = db.column();
+        let merkle_root_meta_cf = db.column();
 
         let db = Arc::new(db);
 
@@ -352,6 +354,7 @@ impl Blockstore {
             program_costs_cf,
             bank_hash_cf,
             optimistic_slots_cf,
+            merkle_root_meta_cf,
             new_shreds_signals: Mutex::default(),
             completed_slots_senders: Mutex::default(),
             shred_timing_point_sender: None,
@@ -711,6 +714,7 @@ impl Blockstore {
         self.program_costs_cf.submit_rocksdb_cf_metrics();
         self.bank_hash_cf.submit_rocksdb_cf_metrics();
         self.optimistic_slots_cf.submit_rocksdb_cf_metrics();
+        self.merkle_root_meta_cf.submit_rocksdb_cf_metrics();
     }
 
     fn try_shred_recovery(

ledger/src/blockstore/blockstore_purge.rs

@@ -220,6 +220,10 @@ impl Blockstore {
             & self
                 .db
                 .delete_range_cf::<cf::OptimisticSlots>(&mut write_batch, from_slot, to_slot)
+                .is_ok()
+            & self
+                .db
+                .delete_range_cf::<cf::MerkleRootMeta>(&mut write_batch, from_slot, to_slot)
                 .is_ok();
         match purge_type {
             PurgeType::Exact => {
@@ -329,6 +333,10 @@ impl Blockstore {
                 .db
                 .delete_file_in_range_cf::<cf::OptimisticSlots>(from_slot, to_slot)
                 .is_ok()
+            & self
+                .db
+                .delete_file_in_range_cf::<cf::MerkleRootMeta>(from_slot, to_slot)
+                .is_ok()
     }
 
     /// Returns true if the special columns, TransactionStatus and

ledger/src/blockstore_db.rs

@@ -2,6 +2,7 @@ pub use rocksdb::Direction as IteratorDirection;
 use {
     crate::{
         blockstore_meta,
+        blockstore_meta::MerkleRootMeta,
         blockstore_metrics::{
             maybe_enable_rocksdb_perf, report_rocksdb_read_perf, report_rocksdb_write_perf,
             BlockstoreRocksDbColumnFamilyMetrics, PerfSamplingStatus, PERF_METRIC_OP_NAME_GET,
@@ -103,6 +104,8 @@ const BLOCK_HEIGHT_CF: &str = "block_height";
 const PROGRAM_COSTS_CF: &str = "program_costs";
 /// Column family for optimistic slots
 const OPTIMISTIC_SLOTS_CF: &str = "optimistic_slots";
+/// Column family for merkle roots
+const MERKLE_ROOT_META_CF: &str = "merkle_root_meta";
 
 #[derive(Error, Debug)]
 pub enum BlockstoreError {
@@ -339,6 +342,19 @@ pub mod columns {
     /// * value type: [`blockstore_meta::OptimisticSlotMetaVersioned`]
     pub struct OptimisticSlots;
 
+    #[derive(Debug)]
+    /// The merkle root meta column
+    ///
+    /// Each merkle shred is part of a merkle tree for
+    /// its FEC set. This column stores that merkle root and associated
+    /// meta information about the first shred received.
+    ///
+    /// Its index type is (Slot, fec_set_index).
+    ///
+    /// * index type: `crate::shred::ErasureSetId` `(Slot, fec_set_index: u32)`
+    /// * value type: [`blockstore_meta::MerkleRootMeta`]`
+    pub struct MerkleRootMeta;
+
     // When adding a new column ...
     // - Add struct below and implement `Column` and `ColumnName` traits
     // - Add descriptor in Rocks::cf_descriptors() and name in Rocks::columns()
@@ -474,6 +490,7 @@ impl Rocks {
             new_cf_descriptor::<BlockHeight>(options, oldest_slot),
             new_cf_descriptor::<ProgramCosts>(options, oldest_slot),
             new_cf_descriptor::<OptimisticSlots>(options, oldest_slot),
+            new_cf_descriptor::<MerkleRootMeta>(options, oldest_slot),
         ]
     }
 
@@ -501,6 +518,7 @@ impl Rocks {
             BlockHeight::NAME,
             ProgramCosts::NAME,
             OptimisticSlots::NAME,
+            MerkleRootMeta::NAME,
         ]
     }
 
@@ -1227,6 +1245,39 @@ impl TypedColumn for columns::OptimisticSlots {
     type Type = blockstore_meta::OptimisticSlotMetaVersioned;
 }
 
+impl Column for columns::MerkleRootMeta {
+    type Index = (Slot, /*fec_set_index:*/ u32);
+
+    fn index(key: &[u8]) -> Self::Index {
+        let slot = BigEndian::read_u64(&key[..8]);
+        let fec_set_index = BigEndian::read_u32(&key[8..]);
+
+        (slot, fec_set_index)
+    }
+
+    fn key((slot, fec_set_index): Self::Index) -> Vec<u8> {
+        let mut key = vec![0; 12];
+        BigEndian::write_u64(&mut key[..8], slot);
+        BigEndian::write_u32(&mut key[8..], fec_set_index);
+        key
+    }
+
+    fn slot((slot, _fec_set_index): Self::Index) -> Slot {
+        slot
+    }
+
+    fn as_index(slot: Slot) -> Self::Index {
+        (slot, 0)
+    }
+}
+
+impl ColumnName for columns::MerkleRootMeta {
+    const NAME: &'static str = MERKLE_ROOT_META_CF;
+}
+impl TypedColumn for columns::MerkleRootMeta {
+    type Type = MerkleRootMeta;
+}
+
 #[derive(Debug)]
 pub struct Database {
     backend: Arc<Rocks>,

ledger/src/blockstore_meta.rs

@@ -138,6 +138,16 @@ pub(crate) struct ErasureConfig {
     num_coding: usize,
 }
 
+#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize)]
+pub struct MerkleRootMeta {
+    /// The merkle root
+    merkle_root: Hash,
+    /// The first received shred index
+    first_received_shred_index: u32,
+    /// The shred type of the first received shred
+    first_received_shred_type: ShredType,
+}
+
 #[derive(Deserialize, Serialize)]
 pub struct DuplicateSlotProof {
     #[serde(with = "serde_bytes")]