Add range sync metrics to track efficiency (#6095)

* Add more range sync metrics to track efficiency

* Add ignored blocks metrics

beacon_node/network/src/metrics.rs

@@ -237,6 +237,36 @@ lazy_static! {
         "Number of Syncing chains in range, per range type",
         &["range_type"]
     );
+    pub static ref SYNCING_CHAINS_REMOVED: Result<IntCounterVec> = try_create_int_counter_vec(
+        "sync_range_removed_chains_total",
+        "Total count of range syncing chains removed per range type",
+        &["range_type"]
+    );
+    pub static ref SYNCING_CHAINS_ADDED: Result<IntCounterVec> = try_create_int_counter_vec(
+        "sync_range_added_chains_total",
+        "Total count of range syncing chains added per range type",
+        &["range_type"]
+    );
+    pub static ref SYNCING_CHAINS_DROPPED_BLOCKS: Result<IntCounterVec> = try_create_int_counter_vec(
+        "sync_range_chains_dropped_blocks_total",
+        "Total count of dropped blocks when removing a syncing chain per range type",
+        &["range_type"]
+    );
+    pub static ref SYNCING_CHAINS_IGNORED_BLOCKS: Result<IntCounterVec> = try_create_int_counter_vec(
+        "sync_range_chains_ignored_blocks_total",
+        "Total count of ignored blocks when processing a syncing chain batch per chain type",
+        &["chain_type"]
+    );
+    pub static ref SYNCING_CHAINS_PROCESSED_BATCHES: Result<IntCounterVec> = try_create_int_counter_vec(
+        "sync_range_chains_processed_batches_total",
+        "Total count of processed batches in a syncing chain batch per chain type",
+        &["chain_type"]
+    );
+    pub static ref SYNCING_CHAIN_BATCH_AWAITING_PROCESSING: Result<Histogram> = try_create_histogram_with_buckets(
+        "sync_range_chain_batch_awaiting_processing_seconds",
+        "Time range sync batches spend in AwaitingProcessing state",
+        Ok(vec![0.01,0.02,0.05,0.1,0.2,0.5,1.0,2.0,5.0,10.0,20.0])
+    );
     pub static ref SYNC_SINGLE_BLOCK_LOOKUPS: Result<IntGauge> = try_create_int_gauge(
         "sync_single_block_lookups",
         "Number of single block lookups underway"

beacon_node/network/src/network_beacon_processor/sync_methods.rs

@@ -326,7 +326,7 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                     .process_blocks(downloaded_blocks.iter(), notify_execution_layer)
                     .await
                 {
-                    (_, Ok(_)) => {
+                    (imported_blocks, Ok(_)) => {
                         debug!(self.log, "Batch processed";
                             "batch_epoch" => epoch,
                             "first_block_slot" => start_slot,
@@ -335,7 +335,8 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                             "processed_blocks" => sent_blocks,
                             "service"=> "sync");
                         BatchProcessResult::Success {
-                            was_non_empty: sent_blocks > 0,
+                            sent_blocks,
+                            imported_blocks,
                         }
                     }
                     (imported_blocks, Err(e)) => {
@@ -349,7 +350,7 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                             "service" => "sync");
                         match e.peer_action {
                             Some(penalty) => BatchProcessResult::FaultyFailure {
-                                imported_blocks: imported_blocks > 0,
+                                imported_blocks,
                                 penalty,
                             },
                             None => BatchProcessResult::NonFaultyFailure,
@@ -368,7 +369,7 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                     .sum::<usize>();
 
                 match self.process_backfill_blocks(downloaded_blocks) {
-                    (_, Ok(_)) => {
+                    (imported_blocks, Ok(_)) => {
                         debug!(self.log, "Backfill batch processed";
                             "batch_epoch" => epoch,
                             "first_block_slot" => start_slot,
@@ -377,7 +378,8 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                             "processed_blobs" => n_blobs,
                             "service"=> "sync");
                         BatchProcessResult::Success {
-                            was_non_empty: sent_blocks > 0,
+                            sent_blocks,
+                            imported_blocks,
                         }
                     }
                     (_, Err(e)) => {
@@ -390,7 +392,7 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                             "service" => "sync");
                         match e.peer_action {
                             Some(penalty) => BatchProcessResult::FaultyFailure {
-                                imported_blocks: false,
+                                imported_blocks: 0,
                                 penalty,
                             },
                             None => BatchProcessResult::NonFaultyFailure,

beacon_node/network/src/sync/backfill_sync/mod.rs

@@ -528,7 +528,7 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
         // result callback. This is done, because an empty batch could end a chain and the logic
         // for removing chains and checking completion is in the callback.
 
-        let blocks = match batch.start_processing() {
+        let (blocks, _) = match batch.start_processing() {
             Err(e) => {
                 return self
                     .fail_sync(BackFillError::BatchInvalidState(batch_id, e.0))
@@ -615,13 +615,15 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
             "batch_epoch" => batch_id, "peer" => %peer, "client" => %network.client_type(&peer));
 
         match result {
-            BatchProcessResult::Success { was_non_empty } => {
+            BatchProcessResult::Success {
+                imported_blocks, ..
+            } => {
                 if let Err(e) = batch.processing_completed(BatchProcessingResult::Success) {
                     self.fail_sync(BackFillError::BatchInvalidState(batch_id, e.0))?;
                 }
                 // If the processed batch was not empty, we can validate previous unvalidated
                 // blocks.
-                if *was_non_empty {
+                if *imported_blocks > 0 {
                     self.advance_chain(network, batch_id);
                 }
 
@@ -677,7 +679,7 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
 
                     Ok(BatchOperationOutcome::Continue) => {
                         // chain can continue. Check if it can be progressed
-                        if *imported_blocks {
+                        if *imported_blocks > 0 {
                             // At least one block was successfully verified and imported, then we can be sure all
                             // previous batches are valid and we only need to download the current failed
                             // batch.

beacon_node/network/src/sync/manager.rs

@@ -156,11 +156,12 @@ pub enum BlockProcessingResult<E: EthSpec> {
 pub enum BatchProcessResult {
     /// The batch was completed successfully. It carries whether the sent batch contained blocks.
     Success {
-        was_non_empty: bool,
+        sent_blocks: usize,
+        imported_blocks: usize,
     },
     /// The batch processing failed. It carries whether the processing imported any block.
     FaultyFailure {
-        imported_blocks: bool,
+        imported_blocks: usize,
         penalty: PeerAction,
     },
     NonFaultyFailure,

beacon_node/network/src/sync/range_sync/batch.rs

@@ -5,6 +5,7 @@ use lighthouse_network::PeerId;
 use std::collections::HashSet;
 use std::hash::{Hash, Hasher};
 use std::ops::Sub;
+use std::time::{Duration, Instant};
 use strum::Display;
 use types::{Epoch, EthSpec, Slot};
 
@@ -118,7 +119,7 @@ pub enum BatchState<E: EthSpec> {
     /// The batch is being downloaded.
     Downloading(PeerId, Id),
     /// The batch has been completely downloaded and is ready for processing.
-    AwaitingProcessing(PeerId, Vec<RpcBlock<E>>),
+    AwaitingProcessing(PeerId, Vec<RpcBlock<E>>, Instant),
     /// The batch is being processed.
     Processing(Attempt),
     /// The batch was successfully processed and is waiting to be validated.
@@ -210,13 +211,26 @@ impl<E: EthSpec, B: BatchConfig> BatchInfo<E, B> {
         match &self.state {
             BatchState::AwaitingDownload | BatchState::Failed => None,
             BatchState::Downloading(peer_id, _)
-            | BatchState::AwaitingProcessing(peer_id, _)
+            | BatchState::AwaitingProcessing(peer_id, _, _)
             | BatchState::Processing(Attempt { peer_id, .. })
             | BatchState::AwaitingValidation(Attempt { peer_id, .. }) => Some(peer_id),
             BatchState::Poisoned => unreachable!("Poisoned batch"),
         }
     }
 
+    /// Returns the count of stored pending blocks if in awaiting processing state
+    pub fn pending_blocks(&self) -> usize {
+        match &self.state {
+            BatchState::AwaitingProcessing(_, blocks, _) => blocks.len(),
+            BatchState::AwaitingDownload
+            | BatchState::Downloading { .. }
+            | BatchState::Processing { .. }
+            | BatchState::AwaitingValidation { .. }
+            | BatchState::Poisoned
+            | BatchState::Failed => 0,
+        }
+    }
+
     /// Returns a BlocksByRange request associated with the batch.
     pub fn to_blocks_by_range_request(&self) -> (BlocksByRangeRequest, ByRangeRequestType) {
         (
@@ -293,7 +307,7 @@ impl<E: EthSpec, B: BatchConfig> BatchInfo<E, B> {
                 }
 
                 let received = blocks.len();
-                self.state = BatchState::AwaitingProcessing(peer, blocks);
+                self.state = BatchState::AwaitingProcessing(peer, blocks, Instant::now());
                 Ok(received)
             }
             BatchState::Poisoned => unreachable!("Poisoned batch"),
@@ -365,11 +379,11 @@ impl<E: EthSpec, B: BatchConfig> BatchInfo<E, B> {
         }
     }
 
-    pub fn start_processing(&mut self) -> Result<Vec<RpcBlock<E>>, WrongState> {
+    pub fn start_processing(&mut self) -> Result<(Vec<RpcBlock<E>>, Duration), WrongState> {
         match self.state.poison() {
-            BatchState::AwaitingProcessing(peer, blocks) => {
+            BatchState::AwaitingProcessing(peer, blocks, start_instant) => {
                 self.state = BatchState::Processing(Attempt::new::<B, E>(peer, &blocks));
-                Ok(blocks)
+                Ok((blocks, start_instant.elapsed()))
             }
             BatchState::Poisoned => unreachable!("Poisoned batch"),
             other => {
@@ -515,7 +529,7 @@ impl<E: EthSpec> std::fmt::Debug for BatchState<E> {
             }) => write!(f, "AwaitingValidation({})", peer_id),
             BatchState::AwaitingDownload => f.write_str("AwaitingDownload"),
             BatchState::Failed => f.write_str("Failed"),
-            BatchState::AwaitingProcessing(ref peer, ref blocks) => {
+            BatchState::AwaitingProcessing(ref peer, ref blocks, _) => {
                 write!(f, "AwaitingProcessing({}, {} blocks)", peer, blocks.len())
             }
             BatchState::Downloading(peer, request_id) => {

beacon_node/network/src/sync/range_sync/chain.rs

@@ -1,4 +1,6 @@
 use super::batch::{BatchInfo, BatchProcessingResult, BatchState};
+use super::RangeSyncType;
+use crate::metrics;
 use crate::network_beacon_processor::ChainSegmentProcessId;
 use crate::sync::network_context::RangeRequestId;
 use crate::sync::{network_context::SyncNetworkContext, BatchOperationOutcome, BatchProcessResult};
@@ -11,6 +13,7 @@ use rand::{seq::SliceRandom, Rng};
 use slog::{crit, debug, o, warn};
 use std::collections::{btree_map::Entry, BTreeMap, HashSet};
 use std::hash::{Hash, Hasher};
+use strum::IntoStaticStr;
 use types::{Epoch, EthSpec, Hash256, Slot};
 
 /// Blocks are downloaded in batches from peers. This constant specifies how many epochs worth of
@@ -53,13 +56,23 @@ pub struct KeepChain;
 pub type ChainId = u64;
 pub type BatchId = Epoch;
 
+#[derive(Debug, Copy, Clone, IntoStaticStr)]
+pub enum SyncingChainType {
+    Head,
+    Finalized,
+    Backfill,
+}
+
 /// A chain of blocks that need to be downloaded. Peers who claim to contain the target head
 /// root are grouped into the peer pool and queried for batches when downloading the
 /// chain.
 pub struct SyncingChain<T: BeaconChainTypes> {
     /// A random id used to identify this chain.
     id: ChainId,
 
+    /// SyncingChain type
+    pub chain_type: SyncingChainType,
+
     /// The start of the chain segment. Any epoch previous to this one has been validated.
     pub start_epoch: Epoch,
 
@@ -126,6 +139,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
         target_head_slot: Slot,
         target_head_root: Hash256,
         peer_id: PeerId,
+        chain_type: SyncingChainType,
         log: &slog::Logger,
     ) -> Self {
         let mut peers = FnvHashMap::default();
@@ -135,6 +149,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
 
         SyncingChain {
             id,
+            chain_type,
             start_epoch,
             target_head_slot,
             target_head_root,
@@ -171,6 +186,14 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
         self.validated_batches * EPOCHS_PER_BATCH
     }
 
+    /// Returns the total count of pending blocks in all the batches of this chain
+    pub fn pending_blocks(&self) -> usize {
+        self.batches
+            .values()
+            .map(|batch| batch.pending_blocks())
+            .sum()
+    }
+
     /// Removes a peer from the chain.
     /// If the peer has active batches, those are considered failed and re-requested.
     pub fn remove_peer(
@@ -305,7 +328,12 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
         // result callback. This is done, because an empty batch could end a chain and the logic
         // for removing chains and checking completion is in the callback.
 
-        let blocks = batch.start_processing()?;
+        let (blocks, duration_in_awaiting_processing) = batch.start_processing()?;
+        metrics::observe_duration(
+            &metrics::SYNCING_CHAIN_BATCH_AWAITING_PROCESSING,
+            duration_in_awaiting_processing,
+        );
+
         let process_id = ChainSegmentProcessId::RangeBatchId(self.id, batch_id);
         self.current_processing_batch = Some(batch_id);
 
@@ -469,10 +497,27 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
         // We consider three cases. Batch was successfully processed, Batch failed processing due
         // to a faulty peer, or batch failed processing but the peer can't be deemed faulty.
         match result {
-            BatchProcessResult::Success { was_non_empty } => {
+            BatchProcessResult::Success {
+                sent_blocks,
+                imported_blocks,
+            } => {
+                if sent_blocks > imported_blocks {
+                    let ignored_blocks = sent_blocks - imported_blocks;
+                    metrics::inc_counter_vec_by(
+                        &metrics::SYNCING_CHAINS_IGNORED_BLOCKS,
+                        &[self.chain_type.into()],
+                        ignored_blocks as u64,
+                    );
+                }
+                metrics::inc_counter_vec(
+                    &metrics::SYNCING_CHAINS_PROCESSED_BATCHES,
+                    &[self.chain_type.into()],
+                );
+
                 batch.processing_completed(BatchProcessingResult::Success)?;
 
-                if *was_non_empty {
+                // was not empty = sent_blocks > 0
+                if *sent_blocks > 0 {
                     // If the processed batch was not empty, we can validate previous unvalidated
                     // blocks.
                     self.advance_chain(network, batch_id);
@@ -515,7 +560,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
                 match batch.processing_completed(BatchProcessingResult::FaultyFailure)? {
                     BatchOperationOutcome::Continue => {
                         // Chain can continue. Check if it can be moved forward.
-                        if *imported_blocks {
+                        if *imported_blocks > 0 {
                             // At least one block was successfully verified and imported, so we can be sure all
                             // previous batches are valid and we only need to download the current failed
                             // batch.
@@ -1142,3 +1187,12 @@ impl RemoveChain {
         )
     }
 }
+
+impl From<RangeSyncType> for SyncingChainType {
+    fn from(value: RangeSyncType) -> Self {
+        match value {
+            RangeSyncType::Head => Self::Head,
+            RangeSyncType::Finalized => Self::Finalized,
+        }
+    }
+}