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Merged
merged 2 commits into from
Oct 20, 2025
Merged

eth/fetcher: add metrics for tracking slow peers #32964

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843333a
chore: add metrics for slow peer
healthykim Oct 19, 2025
542273e
chore: move metrics to metrics.go
healthykim Oct 19, 2025
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59 changes: 59 additions & 0 deletions eth/fetcher/metrics.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,59 @@
// Copyright 2025 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/

// Contains the metrics collected by the txfetcher.

package fetcher

import "github.com/ethereum/go-ethereum/metrics"

var (
txAnnounceInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/in", nil)
txAnnounceKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/known", nil)
txAnnounceUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/underpriced", nil)
txAnnounceDOSMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/dos", nil)

txBroadcastInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/in", nil)
txBroadcastKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/known", nil)
txBroadcastUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/underpriced", nil)
txBroadcastOtherRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/otherreject", nil)

txRequestOutMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/out", nil)
txRequestFailMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/fail", nil)
txRequestDoneMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/done", nil)
txRequestTimeoutMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/timeout", nil)

txReplyInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/in", nil)
txReplyKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/known", nil)
txReplyUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/underpriced", nil)
txReplyOtherRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/otherreject", nil)

txFetcherWaitingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/peers", nil)
txFetcherWaitingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/hashes", nil)
txFetcherQueueingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/peers", nil)
txFetcherQueueingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/hashes", nil)
txFetcherFetchingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/peers", nil)
txFetcherFetchingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/hashes", nil)

txFetcherSlowPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/slow/peers", nil)
// Note: this metric does not mean that the fetching of a transaction
// was blocked by a specific peer during this period, since we request
// another peer to fetch the same transaction hash.
// The purpose of this metric is to measure how long it takes for a slow peer
// to become "unfrozen", either by eventually replying to the request
// or by being dropped, measuring from the moment the request was sent.
txFetcherSlowWait = metrics.NewRegisteredHistogram("eth/fetcher/transaction/slow/wait", nil, metrics.NewExpDecaySample(1028, 0.015))
)
39 changes: 9 additions & 30 deletions eth/fetcher/tx_fetcher.go
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,6 @@ import (
"github.com/ethereum/go-ethereum/core/txpool"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/metrics"
)

const (
Expand Down Expand Up @@ -80,35 +79,6 @@ var (
txFetchTimeout = 5 * time.Second
)

var (
txAnnounceInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/in", nil)
txAnnounceKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/known", nil)
txAnnounceUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/underpriced", nil)
txAnnounceDOSMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/announces/dos", nil)

txBroadcastInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/in", nil)
txBroadcastKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/known", nil)
txBroadcastUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/underpriced", nil)
txBroadcastOtherRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/broadcasts/otherreject", nil)

txRequestOutMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/out", nil)
txRequestFailMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/fail", nil)
txRequestDoneMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/done", nil)
txRequestTimeoutMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/request/timeout", nil)

txReplyInMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/in", nil)
txReplyKnownMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/known", nil)
txReplyUnderpricedMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/underpriced", nil)
txReplyOtherRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/transaction/replies/otherreject", nil)

txFetcherWaitingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/peers", nil)
txFetcherWaitingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/hashes", nil)
txFetcherQueueingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/peers", nil)
txFetcherQueueingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/hashes", nil)
txFetcherFetchingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/peers", nil)
txFetcherFetchingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/hashes", nil)
)

var errTerminated = errors.New("terminated")

// txAnnounce is the notification of the availability of a batch
Expand Down Expand Up @@ -635,6 +605,7 @@ func (f *TxFetcher) loop() {
}
// Keep track of the request as dangling, but never expire
f.requests[peer].hashes = nil
txFetcherSlowPeers.Inc(1)
}
}
// Schedule a new transaction retrieval
Expand Down Expand Up @@ -728,6 +699,10 @@ func (f *TxFetcher) loop() {
log.Warn("Unexpected transaction delivery", "peer", delivery.origin)
break
}
if req.hashes == nil {
txFetcherSlowPeers.Dec(1)
txFetcherSlowWait.Update(time.Duration(f.clock.Now() - req.time).Nanoseconds())
}
delete(f.requests, delivery.origin)

// Anything not delivered should be re-scheduled (with or without
Expand Down Expand Up @@ -807,6 +782,10 @@ func (f *TxFetcher) loop() {
}
delete(f.fetching, hash)
}
if request.hashes == nil {
txFetcherSlowPeers.Dec(1)
txFetcherSlowWait.Update(time.Duration(f.clock.Now() - request.time).Nanoseconds())
}
delete(f.requests, drop.peer)
}
// Clean up general announcement tracking
Expand Down