Time based pruning

core/blockchain.go

@@ -91,7 +91,6 @@ const (
 	txLookupCacheLimit  = 1024
 	maxFutureBlocks     = 256
 	maxTimeFutureBlocks = 30
-	TriesInMemory       = 128
 
 	// BlockChainVersion ensures that an incompatible database forces a resync from scratch.
 	//
@@ -132,12 +131,21 @@ type CacheConfig struct {
 	SnapshotLimit       int           // Memory allowance (MB) to use for caching snapshot entries in memory
 	Preimages           bool          // Whether to store preimage of trie key to the disk
 
+	// Arbitrum: configure GC window
+	TriesInMemory uint64        // Height difference before which a trie may not be garbage-collected
+	TrieRetention time.Duration // Time limit before which a trie may not be garbage-collected
+
 	SnapshotWait bool // Wait for snapshot construction on startup. TODO(karalabe): This is a dirty hack for testing, nuke it
 }
 
 // defaultCacheConfig are the default caching values if none are specified by the
 // user (also used during testing).
 var defaultCacheConfig = &CacheConfig{
+
+	// Arbitrum Config Options
+	TriesInMemory: 128,
+	TrieRetention: 30 * time.Minute,
+
 	TrieCleanLimit: 256,
 	TrieDirtyLimit: 256,
 	TrieTimeLimit:  5 * time.Minute,
@@ -862,6 +870,9 @@ func (bc *BlockChain) Stop() {
 		}
 	}
 
+	// Arbitrum: only discard tries sufficiently old in both time and height
+	retain := bc.FindRetentionBound()
+
 	// Ensure the state of a recent block is also stored to disk before exiting.
 	// We're writing three different states to catch different restart scenarios:
 	//  - HEAD:     So we don't need to reprocess any blocks in the general case
@@ -870,7 +881,7 @@ func (bc *BlockChain) Stop() {
 	if !bc.cacheConfig.TrieDirtyDisabled {
 		triedb := bc.stateCache.TrieDB()
 
-		for _, offset := range []uint64{0, 1, TriesInMemory - 1} {
+		for _, offset := range []uint64{0, 1, retain - 1} {
 			if number := bc.CurrentBlock().NumberU64(); number > offset {
 				recent := bc.GetBlockByNumber(number - offset)
 				if recent.Root() == (common.Hash{}) {
@@ -1275,6 +1286,9 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 	}
 	triedb := bc.stateCache.TrieDB()
 
+	// Arbitrum: only discard tries sufficiently old in both time and height
+	retain := bc.FindRetentionBound()
+
 	// If we're running an archive node, always flush
 	if bc.cacheConfig.TrieDirtyDisabled {
 		return triedb.Commit(root, false, nil)
@@ -1283,7 +1297,7 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 		triedb.Reference(root, common.Hash{}) // metadata reference to keep trie alive
 		bc.triegc.Push(root, -int64(block.NumberU64()))
 
-		if current := block.NumberU64(); current > TriesInMemory {
+		if current := block.NumberU64(); current > retain {
 			// If we exceeded our memory allowance, flush matured singleton nodes to disk
 			var (
 				nodes, imgs = triedb.Size()
@@ -1293,7 +1307,7 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 				triedb.Cap(limit - ethdb.IdealBatchSize)
 			}
 			// Find the next state trie we need to commit
-			chosen := current - TriesInMemory
+			chosen := current - retain
 
 			// If we exceeded out time allowance, flush an entire trie to disk
 			if bc.gcproc > bc.cacheConfig.TrieTimeLimit {
@@ -1305,8 +1319,8 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 				} else {
 					// If we're exceeding limits but haven't reached a large enough memory gap,
 					// warn the user that the system is becoming unstable.
-					if chosen < lastWrite+TriesInMemory && bc.gcproc >= 2*bc.cacheConfig.TrieTimeLimit {
-						log.Info("State in memory for too long, committing", "time", bc.gcproc, "allowance", bc.cacheConfig.TrieTimeLimit, "optimum", float64(chosen-lastWrite)/TriesInMemory)
+					if chosen < lastWrite+retain && bc.gcproc >= 2*bc.cacheConfig.TrieTimeLimit {
+						log.Info("State in memory for too long, committing", "time", bc.gcproc, "allowance", bc.cacheConfig.TrieTimeLimit, "optimum", float64(chosen-lastWrite)/float64(retain))
 					}
 					// Flush an entire trie and restart the counters
 					triedb.Commit(header.Root, true, nil)

core/blockchain_arbitrum.go

@@ -54,3 +54,52 @@ func (bc *BlockChain) ClipToPostNitroGenesis(blockNum rpc.BlockNumber) (rpc.Bloc
 	}
 	return blockNum, currentBlock
 }
+
+// finds the number of blocks that aren't prunable
+func (bc *BlockChain) FindRetentionBound() uint64 {
+	minimumSpan := bc.cacheConfig.TriesInMemory
+	minimumAge := uint64(bc.cacheConfig.TrieRetention.Seconds())
+
+	saturatingCast := func(value int64) uint64 {
+		if value < 0 {
+			return 0
+		}
+		return uint64(value)
+	}
+
+	// enforce that the block be sufficiently deep
+	current := bc.CurrentBlock()
+	heightBound := saturatingCast(int64(current.NumberU64()) - int64(minimumSpan) + 1)
+
+	// find the left bound to our subsequent binary search
+	timeBound := heightBound
+	leap := int64(1)
+	for timeBound > 0 {
+		age := current.Time() - bc.GetBlockByNumber(uint64(timeBound)).Time()
+		if age > minimumAge {
+			break
+		}
+		timeBound = saturatingCast(int64(timeBound) - leap)
+		leap *= 2
+	}
+	if timeBound == heightBound {
+		return current.NumberU64() - timeBound + 1
+	}
+
+	// Algo: binary search on the interval [a, b] for the first prunable block
+	//   Timebound is a prunable block, if one exists.
+	//   We want to find the first block that's not prunable.
+	//
+	a := timeBound   // a prunable block, if possible
+	b := heightBound // not prunable
+	for a+1 < b {
+		mid := a/2 + b/2 // a < mid < b
+		age := current.Time() - bc.GetBlockByNumber(mid).Time()
+		if age <= minimumAge {
+			b = mid // mid is not prunable and less than b
+		} else {
+			a = mid // mid is prunable, but might equal a
+		}
+	}
+	return current.NumberU64() - a
+}

core/blockchain_repair_test.go

@@ -1767,6 +1767,11 @@ func testRepair(t *testing.T, tt *rewindTest, snapshots bool) {
 		genesis = (&Genesis{BaseFee: big.NewInt(params.InitialBaseFee)}).MustCommit(db)
 		engine  = ethash.NewFullFaker()
 		config  = &CacheConfig{
+
+			// Arbitrum
+			TriesInMemory: 128,
+			TrieRetention: 30 * time.Minute,
+
 			TrieCleanLimit: 256,
 			TrieDirtyLimit: 256,
 			TrieTimeLimit:  5 * time.Minute,
@@ -1891,6 +1896,11 @@ func TestIssue23496(t *testing.T) {
 		genesis = (&Genesis{BaseFee: big.NewInt(params.InitialBaseFee)}).MustCommit(db)
 		engine  = ethash.NewFullFaker()
 		config  = &CacheConfig{
+
+			// Arbitrum
+			TriesInMemory: 128,
+			TrieRetention: 30 * time.Minute,
+
 			TrieCleanLimit: 256,
 			TrieDirtyLimit: 256,
 			TrieTimeLimit:  5 * time.Minute,

core/blockchain_sethead_test.go

@@ -1967,6 +1967,11 @@ func testSetHead(t *testing.T, tt *rewindTest, snapshots bool) {
 		genesis = (&Genesis{BaseFee: big.NewInt(params.InitialBaseFee)}).MustCommit(db)
 		engine  = ethash.NewFullFaker()
 		config  = &CacheConfig{
+
+			// Arbitrum
+			TriesInMemory: 128,
+			TrieRetention: 30 * time.Minute,
+
 			TrieCleanLimit: 256,
 			TrieDirtyLimit: 256,
 			TrieTimeLimit:  5 * time.Minute,

core/blockchain_snapshot_test.go

@@ -292,6 +292,11 @@ func (snaptest *gappedSnapshotTest) test(t *testing.T) {
 
 	// Insert a few more blocks without enabling snapshot
 	var cacheConfig = &CacheConfig{
+
+		// Arbitrum
+		TriesInMemory: 128,
+		TrieRetention: 30 * time.Minute,
+
 		TrieCleanLimit: 256,
 		TrieDirtyLimit: 256,
 		TrieTimeLimit:  5 * time.Minute,
@@ -363,6 +368,11 @@ func (snaptest *wipeCrashSnapshotTest) test(t *testing.T) {
 	chain.Stop()
 
 	config := &CacheConfig{
+
+		// Arbitrum
+		TriesInMemory: 128,
+		TrieRetention: 30 * time.Minute,
+
 		TrieCleanLimit: 256,
 		TrieDirtyLimit: 256,
 		TrieTimeLimit:  5 * time.Minute,
@@ -378,6 +388,11 @@ func (snaptest *wipeCrashSnapshotTest) test(t *testing.T) {
 
 	// Restart the chain, the wiper should starts working
 	config = &CacheConfig{
+
+		// Arbitrum
+		TriesInMemory: 128,
+		TrieRetention: 30 * time.Minute,
+
 		TrieCleanLimit: 256,
 		TrieDirtyLimit: 256,
 		TrieTimeLimit:  5 * time.Minute,

eth/backend.go

@@ -192,6 +192,11 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 			EnablePreimageRecording: config.EnablePreimageRecording,
 		}
 		cacheConfig = &core.CacheConfig{
+
+			// Arbitrum
+			TriesInMemory: 128,
+			TrieRetention: 30 * time.Minute,
+
 			TrieCleanLimit:      config.TrieCleanCache,
 			TrieCleanJournal:    stack.ResolvePath(config.TrieCleanCacheJournal),
 			TrieCleanRejournal:  config.TrieCleanCacheRejournal,

eth/gasprice/gasprice_test.go

@@ -145,7 +145,7 @@ func newTestBackend(t *testing.T, londonBlock *big.Int, pending bool) *testBacke
 	// Construct testing chain
 	diskdb := rawdb.NewMemoryDatabase()
 	gspec.Commit(diskdb)
-	chain, err := core.NewBlockChain(diskdb, &core.CacheConfig{TrieCleanNoPrefetch: true}, gspec.Config, engine, vm.Config{}, nil, nil)
+	chain, err := core.NewBlockChain(diskdb, &core.CacheConfig{TrieCleanNoPrefetch: true, TriesInMemory: 128}, gspec.Config, engine, vm.Config{}, nil, nil)
 	if err != nil {
 		t.Fatalf("Failed to create local chain, %v", err)
 	}

eth/tracers/api_test.go

@@ -76,6 +76,11 @@ func newTestBackend(t *testing.T, n int, gspec *core.Genesis, generator func(i i
 	// Import the canonical chain
 	gspec.MustCommit(backend.chaindb)
 	cacheConfig := &core.CacheConfig{
+
+		// Arbitrum
+		TriesInMemory: 128,
+		TrieRetention: 30 * time.Minute,
+
 		TrieCleanLimit:    256,
 		TrieDirtyLimit:    256,
 		TrieTimeLimit:     5 * time.Minute,

miner/worker_test.go

@@ -136,7 +136,7 @@ func newTestWorkerBackend(t *testing.T, chainConfig *params.ChainConfig, engine
 	}
 	genesis := gspec.MustCommit(db)
 
-	chain, _ := core.NewBlockChain(db, &core.CacheConfig{TrieDirtyDisabled: true}, gspec.Config, engine, vm.Config{}, nil, nil)
+	chain, _ := core.NewBlockChain(db, &core.CacheConfig{TrieDirtyDisabled: true, TriesInMemory: 128}, gspec.Config, engine, vm.Config{}, nil, nil)
 	txpool := core.NewTxPool(testTxPoolConfig, chainConfig, chain)
 
 	// Generate a small n-block chain and an uncle block for it

tests/block_test_util.go

@@ -122,7 +122,7 @@ func (t *BlockTest) Run(snapshotter bool) error {
 	} else {
 		engine = ethash.NewShared()
 	}
-	cache := &core.CacheConfig{TrieCleanLimit: 0}
+	cache := &core.CacheConfig{TrieCleanLimit: 0, TriesInMemory: 128}
 	if snapshotter {
 		cache.SnapshotLimit = 1
 		cache.SnapshotWait = true