add inactivity floor to qmdb::immutable Commit operation

Author: danlaine

examples/sync/src/databases/immutable.rs

@@ -22,7 +22,7 @@ use tracing::error;
 pub type Database<E> = immutable::variable::Db<mmr::Family, E, Key, Value, Hasher, Translator>;
 
 /// Operation type alias.
-pub type Operation = immutable::variable::Operation<Key, Value>;
+pub type Operation = immutable::variable::Operation<mmr::Family, Key, Value>;
 
 /// Create a database configuration with appropriate partitioning for Immutable.
 pub fn create_config(context: &impl BufferPooler) -> Config<Translator, VConfig<((), ())>> {
@@ -74,12 +74,12 @@ pub fn create_test_operations(count: usize, seed: u64) -> Vec<Operation> {
         operations.push(Operation::Set(key, value));
 
         if (i + 1) % 10 == 0 {
-            operations.push(Operation::Commit(None));
+            operations.push(Operation::Commit(None, Location::new(0)));
         }
     }
 
     // Always end with a commit
-    operations.push(Operation::Commit(Some(Sha256::fill(1))));
+    operations.push(Operation::Commit(Some(Sha256::fill(1)), Location::new(0)));
     operations
 }
 
@@ -110,8 +110,8 @@ where
                 Operation::Set(key, value) => {
                     batch = batch.set(key, value);
                 }
-                Operation::Commit(metadata) => {
-                    let merkleized = batch.merkleize(self, metadata);
+                Operation::Commit(metadata, floor) => {
+                    let merkleized = batch.merkleize(self, metadata, floor);
                     self.apply_batch(merkleized).await?;
                     self.commit().await?;
                     batch = self.new_batch();
@@ -130,9 +130,7 @@ where
     }
 
     async fn inactivity_floor(&self) -> Location {
-        // For Immutable databases, all retained operations are active,
-        // so the inactivity floor equals the pruning boundary.
-        self.bounds().await.start
+        self.inactivity_floor_loc()
     }
 
     fn historical_proof(

storage/conformance.toml

@@ -140,15 +140,15 @@ hash = "a3fbb5f749fa5b73a684e9f0bebd8973c456e5ee43a0a3db75a99aa550dee302"
 
 ["commonware_storage::qmdb::immutable::operation::fixed::tests::conformance::CodecConformance<FixedOp>"]
 n_cases = 65536
-hash = "4f75cdf8952431729e7a3dfad38a8d5bfbb92bf6b54b1ca180a66745aed618d5"
+hash = "1737c49c112fc9dfdc4dde3626d8ab08a9df8353b9a702e488d3a1fd8e9428dc"
 
 ["commonware_storage::qmdb::immutable::operation::variable::tests::conformance::CodecConformance<VarKeyOp>"]
 n_cases = 65536
-hash = "cce5f888e506282f861e0e49e176b26c65f92e457f0c5f5353fc9b7196f07478"
+hash = "bdee433c53489ee67a42ad2029081d3f233799bd360d6e5e7f29cbaec87c9064"
 
 ["commonware_storage::qmdb::immutable::operation::variable::tests::conformance::CodecConformance<VarOp>"]
 n_cases = 65536
-hash = "fdca5df62d243b28676ee15034663694cd219d5ef80749079126b0ed73effe0d"
+hash = "7952a9bb3a9cec87a95af6dd96a5b88b535106f0241770e0bfdb8aeaf9421056"
 
 ["commonware_storage::qmdb::keyless::operation::tests::conformance::CodecConformance<Operation<FixedEncoding<U64>>>"]
 n_cases = 65536

storage/fuzz/fuzz_targets/qmdb_immutable.rs

@@ -40,6 +40,7 @@ enum ImmutableOperation {
     Commit {
         has_metadata: bool,
         metadata_size: usize,
+        advance_floor: bool,
     },
     Prune {
         loc: u64,
@@ -179,24 +180,35 @@ fn fuzz_family<F: MerkleFamily>(input: &FuzzInput, suffix: &str) {
                     ImmutableOperation::Commit {
                         has_metadata,
                         metadata_size,
+                        advance_floor,
                     } => {
                         let metadata = if has_metadata {
                             Some(generate_value(&mut rng, metadata_size))
                         } else {
                             None
                         };
 
+                        let end = db.bounds().await.end;
+                        let pending_count = pending_sets.len() as u64;
                         assign_pending_locations(
                             &pending_sets,
-                            db.bounds().await.end,
+                            end,
                             &mut keys_set,
                             &mut set_locations,
                         );
                         let mut batch = db.new_batch();
                         for (k, v) in pending_sets.drain(..) {
                             batch = batch.set(k, v);
                         }
-                        let merkleized = batch.merkleize(&db, metadata);
+                        let floor = if advance_floor {
+                            // Advance floor to the commit location (end of this batch).
+                            // total_size = end + pending_count + 1 (commit op).
+                            // Floor at the commit op is the maximum valid value.
+                            Location::new(*end + pending_count)
+                        } else {
+                            db.inactivity_floor_loc()
+                        };
+                        let merkleized = batch.merkleize(&db, metadata, floor);
                         db.apply_batch(merkleized).await.unwrap();
                         db.commit().await.unwrap();
                         last_commit_loc = Some(db.bounds().await.end - 1);
@@ -216,7 +228,10 @@ fn fuzz_family<F: MerkleFamily>(input: &FuzzInput, suffix: &str) {
                             for (k, v) in pending_sets.drain(..) {
                                 batch = batch.set(k, v);
                             }
-                            let merkleized = batch.merkleize(&db, None);
+                            // Set the floor to at least safe_loc so the prune succeeds,
+                            // but never below the current floor (monotonicity).
+                            let floor = safe_loc.max(db.inactivity_floor_loc());
+                            let merkleized = batch.merkleize(&db, None, floor);
                             db.apply_batch(merkleized).await.unwrap();
                             db.commit().await.unwrap();
                             last_commit_loc = Some(db.bounds().await.end - 1);
@@ -247,7 +262,8 @@ fn fuzz_family<F: MerkleFamily>(input: &FuzzInput, suffix: &str) {
                             for (k, v) in pending_sets.drain(..) {
                                 batch = batch.set(k, v);
                             }
-                            let merkleized = batch.merkleize(&db, None);
+                            let floor = db.inactivity_floor_loc();
+                            let merkleized = batch.merkleize(&db, None, floor);
                             db.apply_batch(merkleized).await.unwrap();
                             db.commit().await.unwrap();
                             last_commit_loc = Some(db.bounds().await.end - 1);
@@ -272,7 +288,8 @@ fn fuzz_family<F: MerkleFamily>(input: &FuzzInput, suffix: &str) {
                             let safe_max_ops =
                                 NonZeroU64::new((max_ops % MAX_PROOF_OPS).max(1)).unwrap();
 
-                            let batch = db.new_batch().merkleize(&db, None);
+                            let floor = db.inactivity_floor_loc();
+                            let batch = db.new_batch().merkleize(&db, None, floor);
                             db.apply_batch(batch).await.unwrap();
                             db.commit().await.unwrap();
                             last_commit_loc = Some(db.bounds().await.end - 1);
@@ -307,7 +324,8 @@ fn fuzz_family<F: MerkleFamily>(input: &FuzzInput, suffix: &str) {
                         for (k, v) in pending_sets.drain(..) {
                             batch = batch.set(k, v);
                         }
-                        let merkleized = batch.merkleize(&db, None);
+                        let floor = db.inactivity_floor_loc();
+                        let merkleized = batch.merkleize(&db, None, floor);
                         db.apply_batch(merkleized).await.unwrap();
                         db.commit().await.unwrap();
                         last_commit_loc = Some(db.bounds().await.end - 1);
@@ -326,7 +344,8 @@ fn fuzz_family<F: MerkleFamily>(input: &FuzzInput, suffix: &str) {
             for (k, v) in pending_sets.drain(..) {
                 batch = batch.set(k, v);
             }
-            let merkleized = batch.merkleize(&db, None);
+            let floor = db.inactivity_floor_loc();
+            let merkleized = batch.merkleize(&db, None, floor);
             db.apply_batch(merkleized).await.unwrap();
             db.destroy().await.unwrap();
         }

storage/src/qmdb/immutable/batch.rs

@@ -44,7 +44,7 @@ where
     H: CHasher,
 {
     /// Authenticated journal batch for computing the speculative Merkle root.
-    journal_batch: authenticated::UnmerkleizedBatch<F, H, Operation<K, V>>,
+    journal_batch: authenticated::UnmerkleizedBatch<F, H, Operation<F, K, V>>,
 
     /// Pending mutations.
     mutations: BTreeMap<K, V::Value>,
@@ -65,7 +65,7 @@ where
 #[derive(Clone)]
 pub struct MerkleizedBatch<F: Family, D: Digest, K: Key, V: ValueEncoding> {
     /// Authenticated journal batch (Merkle state + local items).
-    pub(super) journal_batch: Arc<authenticated::MerkleizedBatch<F, D, Operation<K, V>>>,
+    pub(super) journal_batch: Arc<authenticated::MerkleizedBatch<F, D, Operation<F, K, V>>>,
 
     /// This batch's local key-level changes only (not accumulated from ancestors).
     /// Sorted by key with no duplicates; queried via `lookup_sorted` (binary search).
@@ -92,6 +92,9 @@ pub struct MerkleizedBatch<F: Family, D: Digest, K: Key, V: ValueEncoding> {
     /// 1:1 with `ancestor_diffs`: `ancestor_diff_ends[i]` is the boundary for
     /// `ancestor_diffs[i]`. A batch is committed when `ancestor_diff_ends[i] <= db_size`.
     pub(super) ancestor_diff_ends: Vec<u64>,
+
+    /// The inactivity floor declared by this batch's commit operation.
+    pub(super) new_inactivity_floor_loc: Location<F>,
 }
 
 impl<F, H, K, V> UnmerkleizedBatch<F, H, K, V>
@@ -100,7 +103,7 @@ where
     K: Key,
     V: ValueEncoding,
     H: CHasher,
-    Operation<K, V>: EncodeShared,
+    Operation<F, K, V>: EncodeShared,
 {
     /// Create a batch from a committed DB (no parent chain).
     pub(super) fn new<E, C, T>(
@@ -109,7 +112,7 @@ where
     ) -> Self
     where
         E: Context,
-        C: Mutable<Item = Operation<K, V>> + Persistable<Error = JournalError>,
+        C: Mutable<Item = Operation<F, K, V>> + Persistable<Error = JournalError>,
         C::Item: EncodeShared,
         T: Translator,
     {
@@ -139,7 +142,7 @@ where
     ) -> Result<Option<V::Value>, Error<F>>
     where
         E: Context,
-        C: Mutable<Item = Operation<K, V>> + Persistable<Error = JournalError>,
+        C: Mutable<Item = Operation<F, K, V>> + Persistable<Error = JournalError>,
         C::Item: EncodeShared,
         T: Translator,
     {
@@ -164,22 +167,26 @@ where
     }
 
     /// Resolve mutations into operations, merkleize, and return an `Arc<MerkleizedBatch>`.
+    ///
+    /// `inactivity_floor` declares that all operations before this location are inactive.
+    /// It must be >= the database's current inactivity floor (monotonically non-decreasing).
     pub fn merkleize<E, C, T>(
         self,
         db: &Immutable<F, E, K, V, C, H, T>,
         metadata: Option<V::Value>,
+        inactivity_floor: Location<F>,
     ) -> Arc<MerkleizedBatch<F, H::Digest, K, V>>
     where
         E: Context,
-        C: Mutable<Item = Operation<K, V>> + Persistable<Error = JournalError>,
+        C: Mutable<Item = Operation<F, K, V>> + Persistable<Error = JournalError>,
         C::Item: EncodeShared,
         T: Translator,
     {
         let base = self.base_size;
 
         // Build operations: one Set per key, then Commit. `self.mutations` is a BTreeMap, so
         // iteration yields keys in sorted order, which `diff` relies on for binary search.
-        let mut ops: Vec<Operation<K, V>> = Vec::with_capacity(self.mutations.len() + 1);
+        let mut ops: Vec<Operation<F, K, V>> = Vec::with_capacity(self.mutations.len() + 1);
         let mut diff: DiffVec<K, F, V::Value> = Vec::with_capacity(self.mutations.len());
 
         for (key, value) in self.mutations {
@@ -189,7 +196,7 @@ where
         }
         debug_assert!(diff.is_sorted_by(|a, b| a.0 < b.0));
 
-        ops.push(Operation::Commit(metadata));
+        ops.push(Operation::Commit(metadata, inactivity_floor));
 
         let total_size = base + ops.len() as u64;
 
@@ -220,13 +227,14 @@ where
             db_size: self.db_size,
             ancestor_diffs,
             ancestor_diff_ends,
+            new_inactivity_floor_loc: inactivity_floor,
         })
     }
 }
 
 impl<F: Family, D: Digest, K: Key, V: ValueEncoding> MerkleizedBatch<F, D, K, V>
 where
-    Operation<K, V>: EncodeShared,
+    Operation<F, K, V>: EncodeShared,
 {
     /// Return the speculative root.
     pub fn root(&self) -> D {
@@ -251,7 +259,7 @@ where
     ) -> Result<Option<V::Value>, Error<F>>
     where
         E: Context,
-        C: Mutable<Item = Operation<K, V>> + Persistable<Error = JournalError>,
+        C: Mutable<Item = Operation<F, K, V>> + Persistable<Error = JournalError>,
         C::Item: EncodeShared,
         H: CHasher<Digest = D>,
         T: Translator,
@@ -292,7 +300,7 @@ where
     E: Context,
     K: Key,
     V: ValueEncoding,
-    C: Mutable<Item = Operation<K, V>> + Persistable<Error = JournalError>,
+    C: Mutable<Item = Operation<F, K, V>> + Persistable<Error = JournalError>,
     C::Item: EncodeShared,
     H: CHasher,
     T: Translator,
@@ -309,6 +317,7 @@ where
             db_size: journal_size,
             ancestor_diffs: Vec::new(),
             ancestor_diff_ends: Vec::new(),
+            new_inactivity_floor_loc: self.inactivity_floor_loc,
         })
     }
 }