Persist only custody columns in db (#8188)

pawanjay176 · jimmygchen · michaelsproul · web-flow · commit 2c328e32a6cd · 2025-10-13T20:32:13.000+11:00
* Only persist custody columns

* Get claude to write tests

* lint

* Address review comments and fix tests.

* Use supernode only when building chain segments

* Clean up

* Rewrite tests.

* Fix tests

* Clippy

---------

Co-authored-by: Jimmy Chen &lt;jchen.tc@gmail.com&gt;
Co-authored-by: Michael Sproul &lt;michael@sigmaprime.io&gt;
diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -3957,7 +3957,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         // See https://github.com/sigp/lighthouse/issues/2028
         let (_, signed_block, block_data) = signed_block.deconstruct();
 
-        match self.get_blobs_or_columns_store_op(block_root, block_data) {
+        match self.get_blobs_or_columns_store_op(block_root, signed_block.slot(), block_data) {
             Ok(Some(blobs_or_columns_store_op)) => {
                 ops.push(blobs_or_columns_store_op);
             }
@@ -7163,6 +7163,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
     pub(crate) fn get_blobs_or_columns_store_op(
         &self,
         block_root: Hash256,
+        block_slot: Slot,
         block_data: AvailableBlockData<T::EthSpec>,
     ) -> Result<Option<StoreOp<'_, T::EthSpec>>, String> {
         match block_data {
@@ -7175,7 +7176,15 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 );
                 Ok(Some(StoreOp::PutBlobs(block_root, blobs)))
             }
-            AvailableBlockData::DataColumns(data_columns) => {
+            AvailableBlockData::DataColumns(mut data_columns) => {
+                let columns_to_custody = self.custody_columns_for_epoch(Some(
+                    block_slot.epoch(T::EthSpec::slots_per_epoch()),
+                ));
+                // Supernodes need to persist all sampled custody columns
+                if columns_to_custody.len() != self.spec.number_of_custody_groups as usize {
+                    data_columns
+                        .retain(|data_column| columns_to_custody.contains(&data_column.index));
+                }
                 debug!(
                     %block_root,
                     count = data_columns.len(),
diff --git a/beacon_node/beacon_chain/src/historical_blocks.rs b/beacon_node/beacon_chain/src/historical_blocks.rs
@@ -140,7 +140,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
 
             // Store the blobs or data columns too
             if let Some(op) = self
-                .get_blobs_or_columns_store_op(block_root, block_data)
+                .get_blobs_or_columns_store_op(block_root, block.slot(), block_data)
                 .map_err(|e| {
                     HistoricalBlockError::StoreError(StoreError::DBError {
                         message: format!("get_blobs_or_columns_store_op error {e:?}"),
diff --git a/beacon_node/beacon_chain/tests/block_verification.rs b/beacon_node/beacon_chain/tests/block_verification.rs
@@ -42,7 +42,10 @@ enum DataSidecars<E: EthSpec> {
 }
 
 async fn get_chain_segment() -> (Vec<BeaconSnapshot<E>>, Vec<Option<DataSidecars<E>>>) {
-    let harness = get_harness(VALIDATOR_COUNT);
+    // The assumption that you can re-import a block based on what you have in your DB
+    // is no longer true, as fullnodes stores less than what they sample.
+    // We use a supernode here to build a chain segment.
+    let harness = get_harness(VALIDATOR_COUNT, true);
 
     harness
         .extend_chain(
@@ -101,14 +104,18 @@ async fn get_chain_segment() -> (Vec<BeaconSnapshot<E>>, Vec<Option<DataSidecars
     (segment, segment_sidecars)
 }
 
-fn get_harness(validator_count: usize) -> BeaconChainHarness<EphemeralHarnessType<E>> {
+fn get_harness(
+    validator_count: usize,
+    supernode: bool,
+) -> BeaconChainHarness<EphemeralHarnessType<E>> {
     let harness = BeaconChainHarness::builder(MainnetEthSpec)
         .default_spec()
         .chain_config(ChainConfig {
             reconstruct_historic_states: true,
             ..ChainConfig::default()
         })
         .keypairs(KEYPAIRS[0..validator_count].to_vec())
+        .import_all_data_columns(supernode)
         .fresh_ephemeral_store()
         .mock_execution_layer()
         .build();
@@ -252,7 +259,7 @@ fn update_data_column_signed_header<E: EthSpec>(
 
 #[tokio::test]
 async fn chain_segment_full_segment() {
-    let harness = get_harness(VALIDATOR_COUNT);
+    let harness = get_harness(VALIDATOR_COUNT, false);
     let (chain_segment, chain_segment_blobs) = get_chain_segment().await;
     let blocks: Vec<RpcBlock<E>> = chain_segment_blocks(&chain_segment, &chain_segment_blobs)
         .into_iter()
@@ -290,7 +297,7 @@ async fn chain_segment_full_segment() {
 #[tokio::test]
 async fn chain_segment_varying_chunk_size() {
     for chunk_size in &[1, 2, 3, 5, 31, 32, 33, 42] {
-        let harness = get_harness(VALIDATOR_COUNT);
+        let harness = get_harness(VALIDATOR_COUNT, false);
         let (chain_segment, chain_segment_blobs) = get_chain_segment().await;
         let blocks: Vec<RpcBlock<E>> = chain_segment_blocks(&chain_segment, &chain_segment_blobs)
             .into_iter()
@@ -322,7 +329,7 @@ async fn chain_segment_varying_chunk_size() {
 
 #[tokio::test]
 async fn chain_segment_non_linear_parent_roots() {
-    let harness = get_harness(VALIDATOR_COUNT);
+    let harness = get_harness(VALIDATOR_COUNT, false);
     let (chain_segment, chain_segment_blobs) = get_chain_segment().await;
 
     harness
@@ -379,7 +386,7 @@ async fn chain_segment_non_linear_parent_roots() {
 
 #[tokio::test]
 async fn chain_segment_non_linear_slots() {
-    let harness = get_harness(VALIDATOR_COUNT);
+    let harness = get_harness(VALIDATOR_COUNT, false);
     let (chain_segment, chain_segment_blobs) = get_chain_segment().await;
     harness
         .chain
@@ -521,7 +528,7 @@ async fn assert_invalid_signature(
 async fn get_invalid_sigs_harness(
     chain_segment: &[BeaconSnapshot<E>],
 ) -> BeaconChainHarness<EphemeralHarnessType<E>> {
-    let harness = get_harness(VALIDATOR_COUNT);
+    let harness = get_harness(VALIDATOR_COUNT, false);
     harness
         .chain
         .slot_clock
@@ -979,7 +986,7 @@ fn unwrap_err<T, U>(result: Result<T, U>) -> U {
 
 #[tokio::test]
 async fn block_gossip_verification() {
-    let harness = get_harness(VALIDATOR_COUNT);
+    let harness = get_harness(VALIDATOR_COUNT, false);
     let (chain_segment, chain_segment_blobs) = get_chain_segment().await;
 
     let block_index = CHAIN_SEGMENT_LENGTH - 2;
@@ -1382,7 +1389,7 @@ async fn verify_block_for_gossip_slashing_detection() {
 
 #[tokio::test]
 async fn verify_block_for_gossip_doppelganger_detection() {
-    let harness = get_harness(VALIDATOR_COUNT);
+    let harness = get_harness(VALIDATOR_COUNT, false);
 
     let state = harness.get_current_state();
     let ((block, _), _) = harness.make_block(state.clone(), Slot::new(1)).await;
diff --git a/beacon_node/beacon_chain/tests/store_tests.rs b/beacon_node/beacon_chain/tests/store_tests.rs
@@ -2735,6 +2735,14 @@ async fn weak_subjectivity_sync_test(
         .rng(Box::new(StdRng::seed_from_u64(42)))
         .build()
         .expect("should build");
+    beacon_chain
+        .data_availability_checker
+        .custody_context()
+        .init_ordered_data_columns_from_custody_groups(
+            (0..spec.number_of_custody_groups).collect(),
+            &spec,
+        )
+        .unwrap();
 
     let beacon_chain = Arc::new(beacon_chain);
     let wss_block_root = wss_block.canonical_root();
@@ -4137,6 +4145,88 @@ async fn replay_from_split_state() {
     assert_eq!(state.slot(), split.slot);
 }
 
+/// Test that regular nodes filter and store only custody columns when processing blocks with data columns.
+#[tokio::test]
+async fn test_custody_column_filtering_regular_node() {
+    // Skip test if PeerDAS is not scheduled
+    if !test_spec::<E>().is_peer_das_scheduled() {
+        return;
+    }
+
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let harness = get_harness(store.clone(), LOW_VALIDATOR_COUNT);
+
+    // Generate a block with data columns
+    harness.execution_block_generator().set_min_blob_count(1);
+    let current_slot = harness.get_current_slot();
+    let block_root = harness
+        .extend_chain(
+            1,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    // Get custody columns for this epoch - regular nodes only store a subset
+    let expected_custody_columns: HashSet<_> = harness
+        .chain
+        .custody_columns_for_epoch(Some(current_slot.epoch(E::slots_per_epoch())))
+        .iter()
+        .copied()
+        .collect();
+
+    // Check what actually got stored in the database
+    let stored_column_indices: HashSet<_> = store
+        .get_data_column_keys(block_root)
+        .expect("should get stored column keys")
+        .into_iter()
+        .collect();
+
+    assert_eq!(
+        stored_column_indices, expected_custody_columns,
+        "Regular node should only store custody columns"
+    );
+}
+
+/// Test that supernodes store all data columns when processing blocks with data columns.
+#[tokio::test]
+async fn test_custody_column_filtering_supernode() {
+    // Skip test if PeerDAS is not scheduled
+    if !test_spec::<E>().is_peer_das_scheduled() {
+        return;
+    }
+
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let harness = get_harness_import_all_data_columns(store.clone(), LOW_VALIDATOR_COUNT);
+
+    // Generate a block with data columns
+    harness.execution_block_generator().set_min_blob_count(1);
+    let block_root = harness
+        .extend_chain(
+            1,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    // Supernodes are expected to store all data columns
+    let expected_custody_columns: HashSet<_> = (0..E::number_of_columns() as u64).collect();
+
+    // Check what actually got stored in the database
+    let stored_column_indices: HashSet<_> = store
+        .get_data_column_keys(block_root)
+        .expect("should get stored column keys")
+        .into_iter()
+        .collect();
+
+    assert_eq!(
+        stored_column_indices, expected_custody_columns,
+        "Supernode should store all custody columns"
+    );
+}
+
 /// Checks that two chains are the same, for the purpose of these tests.
 ///
 /// Several fields that are hard/impossible to check are ignored (e.g., the store).
