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eth/protocols/snap: skip retrieval for completed storages (#29378) 

* eth/protocols/snap: skip retrieval for completed storages

* eth/protocols/snap: address comments from peter

* eth/protocols/snap: add comments
This commit is contained in:
rjl493456442 2024-04-10 17:02:45 +08:00 committed by Martin HS
parent 2bd6bd01d2
commit 5dcf5032b5
3 changed files with 281 additions and 20 deletions
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5
eth/protocols/snap/metrics.go
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@ -54,4 +54,9 @@ var (
// skipStorageHealingGauge is the metric to track how many storages are retrieved
// in multiple requests but healing is not necessary.
skipStorageHealingGauge = metrics.NewRegisteredGauge("eth/protocols/snap/sync/storage/noheal", nil)
// largeStorageDiscardGauge is the metric to track how many chunked storages are
// discarded during the snap sync.
largeStorageDiscardGauge = metrics.NewRegisteredGauge("eth/protocols/snap/sync/storage/chunk/discard", nil)
largeStorageResumedGauge = metrics.NewRegisteredGauge("eth/protocols/snap/sync/storage/chunk/resume", nil)
)

154
eth/protocols/snap/progress_test.go Normal file
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@ -0,0 +1,154 @@
// Copyright 2024 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/>.
package snap
import (
"encoding/json"
"testing"
"github.com/ethereum/go-ethereum/common"
)
// Legacy sync progress definitions
type legacyStorageTask struct {
Next common.Hash // Next account to sync in this interval
Last common.Hash // Last account to sync in this interval
}
type legacyAccountTask struct {
Next common.Hash // Next account to sync in this interval
Last common.Hash // Last account to sync in this interval
SubTasks map[common.Hash][]*legacyStorageTask // Storage intervals needing fetching for large contracts
}
type legacyProgress struct {
Tasks []*legacyAccountTask // The suspended account tasks (contract tasks within)
}
func compareProgress(a legacyProgress, b SyncProgress) bool {
if len(a.Tasks) != len(b.Tasks) {
return false
}
for i := 0; i < len(a.Tasks); i++ {
if a.Tasks[i].Next != b.Tasks[i].Next {
return false
}
if a.Tasks[i].Last != b.Tasks[i].Last {
return false
}
// new fields are not checked here
if len(a.Tasks[i].SubTasks) != len(b.Tasks[i].SubTasks) {
return false
}
for addrHash, subTasksA := range a.Tasks[i].SubTasks {
subTasksB, ok := b.Tasks[i].SubTasks[addrHash]
if !ok || len(subTasksB) != len(subTasksA) {
return false
}
for j := 0; j < len(subTasksA); j++ {
if subTasksA[j].Next != subTasksB[j].Next {
return false
}
if subTasksA[j].Last != subTasksB[j].Last {
return false
}
}
}
}
return true
}
func makeLegacyProgress() legacyProgress {
return legacyProgress{
Tasks: []*legacyAccountTask{
{
Next: common.Hash{},
Last: common.Hash{0x77},
SubTasks: map[common.Hash][]*legacyStorageTask{
common.Hash{0x1}: {
{
Next: common.Hash{},
Last: common.Hash{0xff},
},
},
},
},
{
Next: common.Hash{0x88},
Last: common.Hash{0xff},
},
},
}
}
func convertLegacy(legacy legacyProgress) SyncProgress {
var progress SyncProgress
for i, task := range legacy.Tasks {
subTasks := make(map[common.Hash][]*storageTask)
for owner, list := range task.SubTasks {
var cpy []*storageTask
for i := 0; i < len(list); i++ {
cpy = append(cpy, &storageTask{
Next: list[i].Next,
Last: list[i].Last,
})
}
subTasks[owner] = cpy
}
accountTask := &accountTask{
Next: task.Next,
Last: task.Last,
SubTasks: subTasks,
}
if i == 0 {
accountTask.StorageCompleted = []common.Hash{{0xaa}, {0xbb}} // fulfill new fields
}
progress.Tasks = append(progress.Tasks, accountTask)
}
return progress
}
func TestSyncProgressCompatibility(t *testing.T) {
// Decode serialized bytes of legacy progress, backward compatibility
legacy := makeLegacyProgress()
blob, err := json.Marshal(legacy)
if err != nil {
t.Fatalf("Failed to marshal progress %v", err)
}
var dec SyncProgress
if err := json.Unmarshal(blob, &dec); err != nil {
t.Fatalf("Failed to unmarshal progress %v", err)
}
if !compareProgress(legacy, dec) {
t.Fatal("sync progress is not backward compatible")
}
// Decode serialized bytes of new format progress
progress := convertLegacy(legacy)
blob, err = json.Marshal(progress)
if err != nil {
t.Fatalf("Failed to marshal progress %v", err)
}
var legacyDec legacyProgress
if err := json.Unmarshal(blob, &legacyDec); err != nil {
t.Fatalf("Failed to unmarshal progress %v", err)
}
if !compareProgress(legacyDec, progress) {
t.Fatal("sync progress is not forward compatible")
}
}

120
eth/protocols/snap/sync.go
View File

@ -295,11 +295,19 @@ type bytecodeHealResponse struct {
// accountTask represents the sync task for a chunk of the account snapshot.
type accountTask struct {
// These fields get serialized to leveldb on shutdown
// These fields get serialized to key-value store on shutdown
Next common.Hash // Next account to sync in this interval
Last common.Hash // Last account to sync in this interval
SubTasks map[common.Hash][]*storageTask // Storage intervals needing fetching for large contracts
// This is a list of account hashes whose storage are already completed
// in this cycle. This field is newly introduced in v1.14 and will be
// empty if the task is resolved from legacy progress data. Furthermore,
// this additional field will be ignored by legacy Geth. The only side
// effect is that these contracts might be resynced in the new cycle,
// retaining the legacy behavior.
StorageCompleted []common.Hash `json:",omitempty"`
// These fields are internals used during runtime
req *accountRequest // Pending request to fill this task
res *accountResponse // Validate response filling this task
@ -311,6 +319,7 @@ type accountTask struct {
codeTasks map[common.Hash]struct{} // Code hashes that need retrieval
stateTasks map[common.Hash]common.Hash // Account hashes->roots that need full state retrieval
stateCompleted map[common.Hash]struct{} // Account hashes whose storage have been completed
genBatch ethdb.Batch // Batch used by the node generator
genTrie *trie.StackTrie // Node generator from storage slots
@ -318,6 +327,30 @@ type accountTask struct {
done bool // Flag whether the task can be removed
}
// activeSubTasks returns the set of storage tasks covered by the current account
// range. Normally this would be the entire subTask set, but on a sync interrupt
// and later resume it can happen that a shorter account range is retrieved. This
// method ensures that we only start up the subtasks covered by the latest account
// response.
//
// Nil is returned if the account range is empty.
func (task *accountTask) activeSubTasks() map[common.Hash][]*storageTask {
if len(task.res.hashes) == 0 {
return nil
}
var (
tasks = make(map[common.Hash][]*storageTask)
last = task.res.hashes[len(task.res.hashes)-1]
)
for hash, subTasks := range task.SubTasks {
subTasks := subTasks // closure
if hash.Cmp(last) <= 0 {
tasks[hash] = subTasks
}
}
return tasks
}
// storageTask represents the sync task for a chunk of the storage snapshot.
type storageTask struct {
Next common.Hash // Next account to sync in this interval
@ -745,6 +778,14 @@ func (s *Syncer) loadSyncStatus() {
for _, task := range s.tasks {
task := task // closure for task.genBatch in the stacktrie writer callback
// Restore the completed storages
task.stateCompleted = make(map[common.Hash]struct{})
for _, hash := range task.StorageCompleted {
task.stateCompleted[hash] = struct{}{}
}
task.StorageCompleted = nil
// Allocate batch for account trie generation
task.genBatch = ethdb.HookedBatch{
Batch: s.db.NewBatch(),
OnPut: func(key []byte, value []byte) {
@ -767,6 +808,8 @@ func (s *Syncer) loadSyncStatus() {
options = options.WithSkipBoundary(task.Next != (common.Hash{}), task.Last != common.MaxHash, boundaryAccountNodesGauge)
}
task.genTrie = trie.NewStackTrie(options)
// Restore leftover storage tasks
for accountHash, subtasks := range task.SubTasks {
for _, subtask := range subtasks {
subtask := subtask // closure for subtask.genBatch in the stacktrie writer callback
@ -865,6 +908,7 @@ func (s *Syncer) loadSyncStatus() {
Last: last,
SubTasks: make(map[common.Hash][]*storageTask),
genBatch: batch,
stateCompleted: make(map[common.Hash]struct{}),
genTrie: trie.NewStackTrie(options),
})
log.Debug("Created account sync task", "from", next, "last", last)
@ -886,6 +930,14 @@ func (s *Syncer) saveSyncStatus() {
}
}
}
// Save the account hashes of completed storage.
task.StorageCompleted = make([]common.Hash, 0, len(task.stateCompleted))
for hash := range task.stateCompleted {
task.StorageCompleted = append(task.StorageCompleted, hash)
}
if len(task.StorageCompleted) > 0 {
log.Debug("Leftover completed storages", "number", len(task.StorageCompleted), "next", task.Next, "last", task.Last)
}
}
// Store the actual progress markers
progress := &SyncProgress{
@ -970,6 +1022,10 @@ func (s *Syncer) cleanStorageTasks() {
delete(task.SubTasks, account)
task.pend--
// Mark the state as complete to prevent resyncing, regardless
// if state healing is necessary.
task.stateCompleted[account] = struct{}{}
// If this was the last pending task, forward the account task
if task.pend == 0 {
s.forwardAccountTask(task)
@ -1209,7 +1265,8 @@ func (s *Syncer) assignStorageTasks(success chan *storageResponse, fail chan *st
continue
}
// Skip tasks that are already retrieving (or done with) all small states
if len(task.SubTasks) == 0 && len(task.stateTasks) == 0 {
storageTasks := task.activeSubTasks()
if len(storageTasks) == 0 && len(task.stateTasks) == 0 {
continue
}
// Task pending retrieval, try to find an idle peer. If no such peer
@ -1253,7 +1310,7 @@ func (s *Syncer) assignStorageTasks(success chan *storageResponse, fail chan *st
roots = make([]common.Hash, 0, storageSets)
subtask *storageTask
)
for account, subtasks := range task.SubTasks {
for account, subtasks := range storageTasks {
for _, st := range subtasks {
// Skip any subtasks already filling
if st.req != nil {
@ -1850,11 +1907,11 @@ func (s *Syncer) processAccountResponse(res *accountResponse) {
res.task.res = res
// Ensure that the response doesn't overflow into the subsequent task
last := res.task.Last.Big()
lastBig := res.task.Last.Big()
for i, hash := range res.hashes {
// Mark the range complete if the last is already included.
// Keep iteration to delete the extra states if exists.
cmp := hash.Big().Cmp(last)
cmp := hash.Big().Cmp(lastBig)
if cmp == 0 {
res.cont = false
continue
@ -1890,7 +1947,21 @@ func (s *Syncer) processAccountResponse(res *accountResponse) {
}
// Check if the account is a contract with an unknown storage trie
if account.Root != types.EmptyRootHash {
// If the storage was already retrieved in the last cycle, there's no need
// to resync it again, regardless of whether the storage root is consistent
// or not.
if _, exist := res.task.stateCompleted[res.hashes[i]]; exist {
// The leftover storage tasks are not expected, unless system is
// very wrong.
if _, ok := res.task.SubTasks[res.hashes[i]]; ok {
panic(fmt.Errorf("unexpected leftover storage tasks, owner: %x", res.hashes[i]))
}
// Mark the healing tag if storage root node is inconsistent, or
// it's non-existent due to storage chunking.
if !rawdb.HasTrieNode(s.db, res.hashes[i], nil, account.Root, s.scheme) {
res.task.needHeal[i] = true
}
} else {
// If there was a previous large state retrieval in progress,
// don't restart it from scratch. This happens if a sync cycle
// is interrupted and resumed later. However, *do* update the
@ -1902,7 +1973,12 @@ func (s *Syncer) processAccountResponse(res *accountResponse) {
}
res.task.needHeal[i] = true
resumed[res.hashes[i]] = struct{}{}
largeStorageResumedGauge.Inc(1)
} else {
// It's possible that in the hash scheme, the storage, along
// with the trie nodes of the given root, is already present
// in the database. Schedule the storage task anyway to simplify
// the logic here.
res.task.stateTasks[res.hashes[i]] = account.Root
}
res.task.needState[i] = true
@ -1910,13 +1986,29 @@ func (s *Syncer) processAccountResponse(res *accountResponse) {
}
}
}
// Delete any subtasks that have been aborted but not resumed. This may undo
// some progress if a new peer gives us less accounts than an old one, but for
// now we have to live with that.
// Delete any subtasks that have been aborted but not resumed. It's essential
// as the corresponding contract might be self-destructed in this cycle(it's
// no longer possible in ethereum as self-destruction is disabled in Cancun
// Fork, but the condition is still necessary for other networks).
//
// Keep the leftover storage tasks if they are not covered by the responded
// account range which should be picked up in next account wave.
if len(res.hashes) > 0 {
// The hash of last delivered account in the response
last := res.hashes[len(res.hashes)-1]
for hash := range res.task.SubTasks {
// TODO(rjl493456442) degrade the log level before merging.
if hash.Cmp(last) > 0 {
log.Info("Keeping suspended storage retrieval", "account", hash)
continue
}
// TODO(rjl493456442) degrade the log level before merging.
// It should never happen in ethereum.
if _, ok := resumed[hash]; !ok {
log.Debug("Aborting suspended storage retrieval", "account", hash)
log.Error("Aborting suspended storage retrieval", "account", hash)
delete(res.task.SubTasks, hash)
largeStorageDiscardGauge.Inc(1)
}
}
}
// If the account range contained no contracts, or all have been fully filled
@ -2014,6 +2106,7 @@ func (s *Syncer) processStorageResponse(res *storageResponse) {
if res.subTask == nil && res.mainTask.needState[j] && (i < len(res.hashes)-1 || !res.cont) {
res.mainTask.needState[j] = false
res.mainTask.pend--
res.mainTask.stateCompleted[account] = struct{}{} // mark it as completed
smallStorageGauge.Inc(1)
}
// If the last contract was chunked, mark it as needing healing
@ -2409,10 +2502,19 @@ func (s *Syncer) forwardAccountTask(task *accountTask) {
return
}
task.Next = incHash(hash)
// Remove the completion flag once the account range is pushed
// forward. The leftover accounts will be skipped in the next
// cycle.
delete(task.stateCompleted, hash)
}
// All accounts marked as complete, track if the entire task is done
task.done = !res.cont
// Error out if there is any leftover completion flag.
if task.done && len(task.stateCompleted) != 0 {
panic(fmt.Errorf("storage completion flags should be emptied, %d left", len(task.stateCompleted)))
}
// Stack trie could have generated trie nodes, push them to disk (we need to
// flush after finalizing task.done. It's fine even if we crash and lose this
// write as it will only cause more data to be downloaded during heal.