cmd, core, eth, graphql, trie: no persisted clean trie cache file

The clean trie cache is persisted periodically, therefore Geth can
quickly warmup the cache in next restart.

However it will reduce the robustness of system. The assumption is
held in Geth that if the parent trie node is present, then the entire
sub-trie associated with the parent are all prensent.

Imagine the scenario that Geth rewinds itself to a past block and
restart, but Geth finds the root node of "future state" in clean
cache then regard this state is present in disk, while is not in fact.

Another example is offline pruning tool. Whenever an offline pruning
is performed, the clean cache file has to be removed to aviod hitting
the root node of "deleted states" in clean cache.

All in all, compare with the minor performance gain, system robustness
is something we care more.

cmd/devp2p/internal/ethtest/suite_test.go

@@ -109,15 +109,13 @@ func setupGeth(stack *node.Node) error {
 	}
 
 	backend, err := eth.New(stack, &ethconfig.Config{
-		Genesis:                 &chain.genesis,
-		NetworkId:               chain.genesis.Config.ChainID.Uint64(), // 19763
-		DatabaseCache:           10,
-		TrieCleanCache:          10,
-		TrieCleanCacheJournal:   "",
-		TrieCleanCacheRejournal: 60 * time.Minute,
-		TrieDirtyCache:          16,
-		TrieTimeout:             60 * time.Minute,
-		SnapshotCache:           10,
+		Genesis:        &chain.genesis,
+		NetworkId:      chain.genesis.Config.ChainID.Uint64(), // 19763
+		DatabaseCache:  10,
+		TrieCleanCache: 10,
+		TrieDirtyCache: 16,
+		TrieTimeout:    60 * time.Minute,
+		SnapshotCache:  10,
 	})
 	if err != nil {
 		return err

cmd/geth/config.go

@@ -276,6 +276,10 @@ func deprecated(field string) bool {
 		return true
 	case "ethconfig.Config.EWASMInterpreter":
 		return true
+	case "ethconfig.Config.TrieCleanCacheJournal":
+		return true
+	case "ethconfig.Config.TrieCleanCacheRejournal":
+		return true
 	default:
 		return false
 	}

cmd/geth/snapshot.go

@@ -50,7 +50,6 @@ var (
 				ArgsUsage: "<root>",
 				Action:    pruneState,
 				Flags: flags.Merge([]cli.Flag{
-					utils.CacheTrieJournalFlag,
 					utils.BloomFilterSizeFlag,
 				}, utils.NetworkFlags, utils.DatabasePathFlags),
 				Description: `
@@ -160,15 +159,14 @@ block is used.
 // Deprecation: this command should be deprecated once the hash-based
 // scheme is deprecated.
 func pruneState(ctx *cli.Context) error {
-	stack, config := makeConfigNode(ctx)
+	stack, _ := makeConfigNode(ctx)
 	defer stack.Close()
 
 	chaindb := utils.MakeChainDatabase(ctx, stack, false)
 	defer chaindb.Close()
 
 	prunerconfig := pruner.Config{
 		Datadir:   stack.ResolvePath(""),
-		Cachedir:  stack.ResolvePath(config.Eth.TrieCleanCacheJournal),
 		BloomSize: ctx.Uint64(utils.BloomFilterSizeFlag.Name),
 	}
 	pruner, err := pruner.NewPruner(chaindb, prunerconfig)

cmd/utils/flags.go

@@ -409,18 +409,6 @@ var (
 		Value:    15,
 		Category: flags.PerfCategory,
 	}
-	CacheTrieJournalFlag = &cli.StringFlag{
-		Name:     "cache.trie.journal",
-		Usage:    "Disk journal directory for trie cache to survive node restarts",
-		Value:    ethconfig.Defaults.TrieCleanCacheJournal,
-		Category: flags.PerfCategory,
-	}
-	CacheTrieRejournalFlag = &cli.DurationFlag{
-		Name:     "cache.trie.rejournal",
-		Usage:    "Time interval to regenerate the trie cache journal",
-		Value:    ethconfig.Defaults.TrieCleanCacheRejournal,
-		Category: flags.PerfCategory,
-	}
 	CacheGCFlag = &cli.IntFlag{
 		Name:     "cache.gc",
 		Usage:    "Percentage of cache memory allowance to use for trie pruning (default = 25% full mode, 0% archive mode)",
@@ -1709,12 +1697,6 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 	if ctx.IsSet(CacheFlag.Name) || ctx.IsSet(CacheTrieFlag.Name) {
 		cfg.TrieCleanCache = ctx.Int(CacheFlag.Name) * ctx.Int(CacheTrieFlag.Name) / 100
 	}
-	if ctx.IsSet(CacheTrieJournalFlag.Name) {
-		cfg.TrieCleanCacheJournal = ctx.String(CacheTrieJournalFlag.Name)
-	}
-	if ctx.IsSet(CacheTrieRejournalFlag.Name) {
-		cfg.TrieCleanCacheRejournal = ctx.Duration(CacheTrieRejournalFlag.Name)
-	}
 	if ctx.IsSet(CacheFlag.Name) || ctx.IsSet(CacheGCFlag.Name) {
 		cfg.TrieDirtyCache = ctx.Int(CacheFlag.Name) * ctx.Int(CacheGCFlag.Name) / 100
 	}

cmd/utils/flags_legacy.go

@@ -33,6 +33,8 @@ var ShowDeprecated = &cli.Command{
 
 var DeprecatedFlags = []cli.Flag{
 	NoUSBFlag,
+	CacheTrieJournalFlag,
+	CacheTrieRejournalFlag,
 }
 
 var (
@@ -42,6 +44,17 @@ var (
 		Usage:    "Disables monitoring for and managing USB hardware wallets (deprecated)",
 		Category: flags.DeprecatedCategory,
 	}
+	// (Deprecated June 2023, shown in aliased flags section)
+	CacheTrieJournalFlag = &cli.StringFlag{
+		Name:     "cache.trie.journal",
+		Usage:    "Disk journal directory for trie cache to survive node restarts",
+		Category: flags.PerfCategory,
+	}
+	CacheTrieRejournalFlag = &cli.DurationFlag{
+		Name:     "cache.trie.rejournal",
+		Usage:    "Time interval to regenerate the trie cache journal",
+		Category: flags.PerfCategory,
+	}
 )
 
 // showDeprecated displays deprecated flags that will be soon removed from the codebase.

core/blockchain.go

@@ -130,8 +130,6 @@ const (
 // that's resident in a blockchain.
 type CacheConfig struct {
 	TrieCleanLimit      int           // Memory allowance (MB) to use for caching trie nodes in memory
-	TrieCleanJournal    string        // Disk journal for saving clean cache entries.
-	TrieCleanRejournal  time.Duration // Time interval to dump clean cache to disk periodically
 	TrieCleanNoPrefetch bool          // Whether to disable heuristic state prefetching for followup blocks
 	TrieDirtyLimit      int           // Memory limit (MB) at which to start flushing dirty trie nodes to disk
 	TrieDirtyDisabled   bool          // Whether to disable trie write caching and GC altogether (archive node)
@@ -238,7 +236,6 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, genesis *Genesis
 	// Open trie database with provided config
 	triedb := trie.NewDatabaseWithConfig(db, &trie.Config{
 		Cache:     cacheConfig.TrieCleanLimit,
-		Journal:   cacheConfig.TrieCleanJournal,
 		Preimages: cacheConfig.Preimages,
 	})
 	// Setup the genesis block, commit the provided genesis specification
@@ -411,18 +408,6 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, genesis *Genesis
 	bc.wg.Add(1)
 	go bc.updateFutureBlocks()
 
-	// If periodic cache journal is required, spin it up.
-	if bc.cacheConfig.TrieCleanRejournal > 0 {
-		if bc.cacheConfig.TrieCleanRejournal < time.Minute {
-			log.Warn("Sanitizing invalid trie cache journal time", "provided", bc.cacheConfig.TrieCleanRejournal, "updated", time.Minute)
-			bc.cacheConfig.TrieCleanRejournal = time.Minute
-		}
-		bc.wg.Add(1)
-		go func() {
-			defer bc.wg.Done()
-			bc.triedb.SaveCachePeriodically(bc.cacheConfig.TrieCleanJournal, bc.cacheConfig.TrieCleanRejournal, bc.quit)
-		}()
-	}
 	// Rewind the chain in case of an incompatible config upgrade.
 	if compat, ok := genesisErr.(*params.ConfigCompatError); ok {
 		log.Warn("Rewinding chain to upgrade configuration", "err", compat)
@@ -987,11 +972,6 @@ func (bc *BlockChain) Stop() {
 	if err := bc.stateCache.TrieDB().Close(); err != nil {
 		log.Error("Failed to close trie db", "err", err)
 	}
-	// Ensure all live cached entries be saved into disk, so that we can skip
-	// cache warmup when node restarts.
-	if bc.cacheConfig.TrieCleanJournal != "" {
-		bc.triedb.SaveCache(bc.cacheConfig.TrieCleanJournal)
-	}
 	log.Info("Blockchain stopped")
 }
 

core/state/pruner/pruner.go

@@ -57,7 +57,6 @@ const (
 // Config includes all the configurations for pruning.
 type Config struct {
 	Datadir   string // The directory of the state database
-	Cachedir  string // The directory of state clean cache
 	BloomSize uint64 // The Megabytes of memory allocated to bloom-filter
 }
 
@@ -241,7 +240,7 @@ func (p *Pruner) Prune(root common.Hash) error {
 		return err
 	}
 	if stateBloomRoot != (common.Hash{}) {
-		return RecoverPruning(p.config.Datadir, p.db, p.config.Cachedir)
+		return RecoverPruning(p.config.Datadir, p.db)
 	}
 	// If the target state root is not specified, use the HEAD-127 as the
 	// target. The reason for picking it is:
@@ -299,12 +298,6 @@ func (p *Pruner) Prune(root common.Hash) error {
 			log.Info("Selecting user-specified state as the pruning target", "root", root)
 		}
 	}
-	// Before start the pruning, delete the clean trie cache first.
-	// It's necessary otherwise in the next restart we will hit the
-	// deleted state root in the "clean cache" so that the incomplete
-	// state is picked for usage.
-	deleteCleanTrieCache(p.config.Cachedir)
-
 	// All the state roots of the middle layer should be forcibly pruned,
 	// otherwise the dangling state will be left.
 	middleRoots := make(map[common.Hash]struct{})
@@ -342,7 +335,7 @@ func (p *Pruner) Prune(root common.Hash) error {
 // pruning can be resumed. What's more if the bloom filter is constructed, the
 // pruning **has to be resumed**. Otherwise a lot of dangling nodes may be left
 // in the disk.
-func RecoverPruning(datadir string, db ethdb.Database, trieCachePath string) error {
+func RecoverPruning(datadir string, db ethdb.Database) error {
 	stateBloomPath, stateBloomRoot, err := findBloomFilter(datadir)
 	if err != nil {
 		return err
@@ -378,12 +371,6 @@ func RecoverPruning(datadir string, db ethdb.Database, trieCachePath string) err
 	}
 	log.Info("Loaded state bloom filter", "path", stateBloomPath)
 
-	// Before start the pruning, delete the clean trie cache first.
-	// It's necessary otherwise in the next restart we will hit the
-	// deleted state root in the "clean cache" so that the incomplete
-	// state is picked for usage.
-	deleteCleanTrieCache(trieCachePath)
-
 	// All the state roots of the middle layers should be forcibly pruned,
 	// otherwise the dangling state will be left.
 	var (
@@ -497,23 +484,3 @@ func findBloomFilter(datadir string) (string, common.Hash, error) {
 	}
 	return stateBloomPath, stateBloomRoot, nil
 }
-
-const warningLog = `
-
-WARNING!
-
-The clean trie cache is not found. Please delete it by yourself after the 
-pruning. Remember don't start the Geth without deleting the clean trie cache
-otherwise the entire database may be damaged!
-
-Check the command description "geth snapshot prune-state --help" for more details.
-`
-
-func deleteCleanTrieCache(path string) {
-	if !common.FileExist(path) {
-		log.Warn(warningLog)
-		return
-	}
-	os.RemoveAll(path)
-	log.Info("Deleted trie clean cache", "path", path)
-}

eth/backend.go

@@ -132,7 +132,7 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err := pruner.RecoverPruning(stack.ResolvePath(""), chainDb, stack.ResolvePath(config.TrieCleanCacheJournal)); err != nil {
+	if err := pruner.RecoverPruning(stack.ResolvePath(""), chainDb); err != nil {
 		log.Error("Failed to recover state", "error", err)
 	}
 	// Transfer mining-related config to the ethash config.
@@ -184,8 +184,6 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 		}
 		cacheConfig = &core.CacheConfig{
 			TrieCleanLimit:      config.TrieCleanCache,
-			TrieCleanJournal:    stack.ResolvePath(config.TrieCleanCacheJournal),
-			TrieCleanRejournal:  config.TrieCleanCacheRejournal,
 			TrieCleanNoPrefetch: config.NoPrefetch,
 			TrieDirtyLimit:      config.TrieDirtyCache,
 			TrieDirtyDisabled:   config.NoPruning,

eth/ethconfig/config.go

@@ -57,25 +57,23 @@ var LightClientGPO = gasprice.Config{
 
 // Defaults contains default settings for use on the Ethereum main net.
 var Defaults = Config{
-	SyncMode:                downloader.SnapSync,
-	NetworkId:               1,
-	TxLookupLimit:           2350000,
-	LightPeers:              100,
-	UltraLightFraction:      75,
-	DatabaseCache:           512,
-	TrieCleanCache:          154,
-	TrieCleanCacheJournal:   "triecache",
-	TrieCleanCacheRejournal: 60 * time.Minute,
-	TrieDirtyCache:          256,
-	TrieTimeout:             60 * time.Minute,
-	SnapshotCache:           102,
-	FilterLogCacheSize:      32,
-	Miner:                   miner.DefaultConfig,
-	TxPool:                  legacypool.DefaultConfig,
-	RPCGasCap:               50000000,
-	RPCEVMTimeout:           5 * time.Second,
-	GPO:                     FullNodeGPO,
-	RPCTxFeeCap:             1, // 1 ether
+	SyncMode:           downloader.SnapSync,
+	NetworkId:          1,
+	TxLookupLimit:      2350000,
+	LightPeers:         100,
+	UltraLightFraction: 75,
+	DatabaseCache:      512,
+	TrieCleanCache:     154,
+	TrieDirtyCache:     256,
+	TrieTimeout:        60 * time.Minute,
+	SnapshotCache:      102,
+	FilterLogCacheSize: 32,
+	Miner:              miner.DefaultConfig,
+	TxPool:             legacypool.DefaultConfig,
+	RPCGasCap:          50000000,
+	RPCEVMTimeout:      5 * time.Second,
+	GPO:                FullNodeGPO,
+	RPCTxFeeCap:        1, // 1 ether
 }
 
 //go:generate go run github.com/fjl/gencodec -type Config -formats toml -out gen_config.go
@@ -124,13 +122,11 @@ type Config struct {
 	DatabaseCache      int
 	DatabaseFreezer    string
 
-	TrieCleanCache          int
-	TrieCleanCacheJournal   string        `toml:",omitempty"` // Disk journal directory for trie cache to survive node restarts
-	TrieCleanCacheRejournal time.Duration `toml:",omitempty"` // Time interval to regenerate the journal for clean cache
-	TrieDirtyCache          int
-	TrieTimeout             time.Duration
-	SnapshotCache           int
-	Preimages               bool
+	TrieCleanCache int
+	TrieDirtyCache int
+	TrieTimeout    time.Duration
+	SnapshotCache  int
+	Preimages      bool
 
 	// This is the number of blocks for which logs will be cached in the filter system.
 	FilterLogCacheSize int

graphql/graphql_test.go

@@ -438,14 +438,12 @@ func createNode(t *testing.T) *node.Node {
 
 func newGQLService(t *testing.T, stack *node.Node, shanghai bool, gspec *core.Genesis, genBlocks int, genfunc func(i int, gen *core.BlockGen)) (*handler, []*types.Block) {
 	ethConf := &ethconfig.Config{
-		Genesis:                 gspec,
-		NetworkId:               1337,
-		TrieCleanCache:          5,
-		TrieCleanCacheJournal:   "triecache",
-		TrieCleanCacheRejournal: 60 * time.Minute,
-		TrieDirtyCache:          5,
-		TrieTimeout:             60 * time.Minute,
-		SnapshotCache:           5,
+		Genesis:        gspec,
+		NetworkId:      1337,
+		TrieCleanCache: 5,
+		TrieDirtyCache: 5,
+		TrieTimeout:    60 * time.Minute,
+		SnapshotCache:  5,
 	}
 	ethBackend, err := eth.New(stack, ethConf)
 	if err != nil {

tests/fuzzers/snap/fuzz_handler.go

@@ -71,7 +71,6 @@ func getChain() *core.BlockChain {
 		TrieDirtyLimit:      0,
 		TrieTimeLimit:       5 * time.Minute,
 		TrieCleanNoPrefetch: true,
-		TrieCleanRejournal:  0,
 		SnapshotLimit:       100,
 		SnapshotWait:        true,
 	}