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cmd, core, eth, les, node: chain freezer on top of db rework

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This commit is contained in:
Péter Szilágyi 2019-03-08 15:56:20 +02:00
parent 0c5f8c078a
commit 006c21efc7
No known key found for this signature in database
GPG Key ID: E9AE538CEDF8293D
15 changed files with 755 additions and 35 deletions
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7
cmd/geth/chaincmd.go
View File

@ -368,9 +368,12 @@ func exportPreimages(ctx *cli.Context) error {
func copyDb(ctx *cli.Context) error {
// Ensure we have a source chain directory to copy
if len(ctx.Args()) != 1 {
if len(ctx.Args()) < 1 {
utils.Fatalf("Source chaindata directory path argument missing")
}
if len(ctx.Args()) < 2 {
utils.Fatalf("Source ancient chain directory path argument missing")
}
// Initialize a new chain for the running node to sync into
stack := makeFullNode(ctx)
defer stack.Close()
@ -385,7 +388,7 @@ func copyDb(ctx *cli.Context) error {
dl := downloader.New(0, chainDb, syncBloom, new(event.TypeMux), chain, nil, nil)
// Create a source peer to satisfy downloader requests from
db, err := rawdb.NewLevelDBDatabase(ctx.Args().First(), ctx.GlobalInt(utils.CacheFlag.Name)/2, 256, "")
db, err := rawdb.NewLevelDBDatabaseWithFreezer(ctx.Args().First(), ctx.GlobalInt(utils.CacheFlag.Name)/2, 256, ctx.Args().Get(1), "")
if err != nil {
return err
}

1
cmd/geth/main.go
View File

@ -62,6 +62,7 @@ var (
utils.BootnodesV4Flag,
utils.BootnodesV5Flag,
utils.DataDirFlag,
utils.AncientFlag,
utils.KeyStoreDirFlag,
utils.ExternalSignerFlag,
utils.NoUSBFlag,

1
cmd/geth/usage.go
View File

@ -69,6 +69,7 @@ var AppHelpFlagGroups = []flagGroup{
Flags: []cli.Flag{
configFileFlag,
utils.DataDirFlag,
utils.AncientFlag,
utils.KeyStoreDirFlag,
utils.NoUSBFlag,
utils.NetworkIdFlag,

9
cmd/utils/flags.go
View File

@ -117,6 +117,10 @@ var (
Usage: "Data directory for the databases and keystore",
Value: DirectoryString{node.DefaultDataDir()},
}
AncientFlag = DirectoryFlag{
Name: "datadir.ancient",
Usage: "Data directory for ancient chain segments (default = inside chaindata)",
}
KeyStoreDirFlag = DirectoryFlag{
Name: "keystore",
Usage: "Directory for the keystore (default = inside the datadir)",
@ -1378,6 +1382,9 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
cfg.DatabaseCache = ctx.GlobalInt(CacheFlag.Name) * ctx.GlobalInt(CacheDatabaseFlag.Name) / 100
}
cfg.DatabaseHandles = makeDatabaseHandles()
if ctx.GlobalIsSet(AncientFlag.Name) {
cfg.DatabaseFreezer = ctx.GlobalString(AncientFlag.Name)
}
if gcmode := ctx.GlobalString(GCModeFlag.Name); gcmode != "full" && gcmode != "archive" {
Fatalf("--%s must be either 'full' or 'archive'", GCModeFlag.Name)
@ -1566,7 +1573,7 @@ func MakeChainDatabase(ctx *cli.Context, stack *node.Node) ethdb.Database {
if ctx.GlobalString(SyncModeFlag.Name) == "light" {
name = "lightchaindata"
}
chainDb, err := stack.OpenDatabase(name, cache, handles, "")
chainDb, err := stack.OpenDatabaseWithFreezer(name, cache, handles, "", "")
if err != nil {
Fatalf("Could not open database: %v", err)
}

82
core/rawdb/accessors_chain.go
View File

@ -30,8 +30,11 @@ import (
)
// ReadCanonicalHash retrieves the hash assigned to a canonical block number.
func ReadCanonicalHash(db ethdb.Reader, number uint64) common.Hash {
data, _ := db.Get(headerHashKey(number))
func ReadCanonicalHash(db ethdb.AncientReader, number uint64) common.Hash {
data, _ := db.Ancient("hashes", number)
if len(data) == 0 {
data, _ = db.Get(headerHashKey(number))
}
if len(data) == 0 {
return common.Hash{}
}
@ -52,6 +55,24 @@ func DeleteCanonicalHash(db ethdb.Writer, number uint64) {
}
}
// readAllHashes retrieves all the hashes assigned to blocks at a certain heights,
// both canonical and reorged forks included.
//
// This method is a helper for the chain reader. It should never be exposed to the
// outside world.
func readAllHashes(db ethdb.Iteratee, number uint64) []common.Hash {
prefix := headerKeyPrefix(number)
hashes := make([]common.Hash, 0, 1)
it := db.NewIteratorWithPrefix(prefix)
for it.Next() {
if key := it.Key(); len(key) == len(prefix)+32 {
hashes = append(hashes, common.BytesToHash(key[len(key)-32:]))
}
}
return hashes
}
// ReadHeaderNumber returns the header number assigned to a hash.
func ReadHeaderNumber(db ethdb.Reader, hash common.Hash) *uint64 {
data, _ := db.Get(headerNumberKey(hash))
@ -129,13 +150,19 @@ func WriteFastTrieProgress(db ethdb.Writer, count uint64) {
}
// ReadHeaderRLP retrieves a block header in its raw RLP database encoding.
func ReadHeaderRLP(db ethdb.Reader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Get(headerKey(number, hash))
func ReadHeaderRLP(db ethdb.AncientReader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Ancient("headers", number)
if len(data) == 0 {
data, _ = db.Get(headerKey(number, hash))
}
return data
}
// HasHeader verifies the existence of a block header corresponding to the hash.
func HasHeader(db ethdb.Reader, hash common.Hash, number uint64) bool {
func HasHeader(db ethdb.AncientReader, hash common.Hash, number uint64) bool {
if has, err := db.Ancient("hashes", number); err == nil && common.BytesToHash(has) == hash {
return true
}
if has, err := db.Has(headerKey(number, hash)); !has || err != nil {
return false
}
@ -143,7 +170,7 @@ func HasHeader(db ethdb.Reader, hash common.Hash, number uint64) bool {
}
// ReadHeader retrieves the block header corresponding to the hash.
func ReadHeader(db ethdb.Reader, hash common.Hash, number uint64) *types.Header {
func ReadHeader(db ethdb.AncientReader, hash common.Hash, number uint64) *types.Header {
data := ReadHeaderRLP(db, hash, number)
if len(data) == 0 {
return nil
@ -197,8 +224,11 @@ func deleteHeaderWithoutNumber(db ethdb.Writer, hash common.Hash, number uint64)
}
// ReadBodyRLP retrieves the block body (transactions and uncles) in RLP encoding.
func ReadBodyRLP(db ethdb.Reader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Get(blockBodyKey(number, hash))
func ReadBodyRLP(db ethdb.AncientReader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Ancient("bodies", number)
if len(data) == 0 {
data, _ = db.Get(blockBodyKey(number, hash))
}
return data
}
@ -210,7 +240,10 @@ func WriteBodyRLP(db ethdb.Writer, hash common.Hash, number uint64, rlp rlp.RawV
}
// HasBody verifies the existence of a block body corresponding to the hash.
func HasBody(db ethdb.Reader, hash common.Hash, number uint64) bool {
func HasBody(db ethdb.AncientReader, hash common.Hash, number uint64) bool {
if has, err := db.Ancient("hashes", number); err == nil && common.BytesToHash(has) == hash {
return true
}
if has, err := db.Has(blockBodyKey(number, hash)); !has || err != nil {
return false
}
@ -218,7 +251,7 @@ func HasBody(db ethdb.Reader, hash common.Hash, number uint64) bool {
}
// ReadBody retrieves the block body corresponding to the hash.
func ReadBody(db ethdb.Reader, hash common.Hash, number uint64) *types.Body {
func ReadBody(db ethdb.AncientReader, hash common.Hash, number uint64) *types.Body {
data := ReadBodyRLP(db, hash, number)
if len(data) == 0 {
return nil
@ -248,13 +281,16 @@ func DeleteBody(db ethdb.Writer, hash common.Hash, number uint64) {
}
// ReadTdRLP retrieves a block's total difficulty corresponding to the hash in RLP encoding.
func ReadTdRLP(db ethdb.Reader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Get(headerTDKey(number, hash))
func ReadTdRLP(db ethdb.AncientReader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Ancient("diffs", number)
if len(data) == 0 {
data, _ = db.Get(headerTDKey(number, hash))
}
return data
}
// ReadTd retrieves a block's total difficulty corresponding to the hash.
func ReadTd(db ethdb.Reader, hash common.Hash, number uint64) *big.Int {
func ReadTd(db ethdb.AncientReader, hash common.Hash, number uint64) *big.Int {
data := ReadTdRLP(db, hash, number)
if len(data) == 0 {
return nil
@ -287,7 +323,10 @@ func DeleteTd(db ethdb.Writer, hash common.Hash, number uint64) {
// HasReceipts verifies the existence of all the transaction receipts belonging
// to a block.
func HasReceipts(db ethdb.Reader, hash common.Hash, number uint64) bool {
func HasReceipts(db ethdb.AncientReader, hash common.Hash, number uint64) bool {
if has, err := db.Ancient("hashes", number); err == nil && common.BytesToHash(has) == hash {
return true
}
if has, err := db.Has(blockReceiptsKey(number, hash)); !has || err != nil {
return false
}
@ -295,15 +334,18 @@ func HasReceipts(db ethdb.Reader, hash common.Hash, number uint64) bool {
}
// ReadReceiptsRLP retrieves all the transaction receipts belonging to a block in RLP encoding.
func ReadReceiptsRLP(db ethdb.Reader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Get(blockReceiptsKey(number, hash))
func ReadReceiptsRLP(db ethdb.AncientReader, hash common.Hash, number uint64) rlp.RawValue {
data, _ := db.Ancient("receipts", number)
if len(data) == 0 {
data, _ = db.Get(blockReceiptsKey(number, hash))
}
return data
}
// ReadRawReceipts retrieves all the transaction receipts belonging to a block.
// The receipt metadata fields are not guaranteed to be populated, so they
// should not be used. Use ReadReceipts instead if the metadata is needed.
func ReadRawReceipts(db ethdb.Reader, hash common.Hash, number uint64) types.Receipts {
func ReadRawReceipts(db ethdb.AncientReader, hash common.Hash, number uint64) types.Receipts {
// Retrieve the flattened receipt slice
data := ReadReceiptsRLP(db, hash, number)
if len(data) == 0 {
@ -329,7 +371,7 @@ func ReadRawReceipts(db ethdb.Reader, hash common.Hash, number uint64) types.Rec
// The current implementation populates these metadata fields by reading the receipts'
// corresponding block body, so if the block body is not found it will return nil even
// if the receipt itself is stored.
func ReadReceipts(db ethdb.Reader, hash common.Hash, number uint64, config *params.ChainConfig) types.Receipts {
func ReadReceipts(db ethdb.AncientReader, hash common.Hash, number uint64, config *params.ChainConfig) types.Receipts {
// We're deriving many fields from the block body, retrieve beside the receipt
receipts := ReadRawReceipts(db, hash, number)
if receipts == nil {
@ -377,7 +419,7 @@ func DeleteReceipts(db ethdb.Writer, hash common.Hash, number uint64) {
//
// Note, due to concurrent download of header and block body the header and thus
// canonical hash can be stored in the database but the body data not (yet).
func ReadBlock(db ethdb.Reader, hash common.Hash, number uint64) *types.Block {
func ReadBlock(db ethdb.AncientReader, hash common.Hash, number uint64) *types.Block {
header := ReadHeader(db, hash, number)
if header == nil {
return nil
@ -413,7 +455,7 @@ func deleteBlockWithoutNumber(db ethdb.Writer, hash common.Hash, number uint64)
}
// FindCommonAncestor returns the last common ancestor of two block headers
func FindCommonAncestor(db ethdb.Reader, a, b *types.Header) *types.Header {
func FindCommonAncestor(db ethdb.AncientReader, a, b *types.Header) *types.Header {
for bn := b.Number.Uint64(); a.Number.Uint64() > bn; {
a = ReadHeader(db, a.ParentHash, a.Number.Uint64()-1)
if a == nil {

4
core/rawdb/accessors_indexes.go
View File

@ -69,7 +69,7 @@ func DeleteTxLookupEntry(db ethdb.Writer, hash common.Hash) {
// ReadTransaction retrieves a specific transaction from the database, along with
// its added positional metadata.
func ReadTransaction(db ethdb.Reader, hash common.Hash) (*types.Transaction, common.Hash, uint64, uint64) {
func ReadTransaction(db ethdb.AncientReader, hash common.Hash) (*types.Transaction, common.Hash, uint64, uint64) {
blockNumber := ReadTxLookupEntry(db, hash)
if blockNumber == nil {
return nil, common.Hash{}, 0, 0
@ -94,7 +94,7 @@ func ReadTransaction(db ethdb.Reader, hash common.Hash) (*types.Transaction, com
// ReadReceipt retrieves a specific transaction receipt from the database, along with
// its added positional metadata.
func ReadReceipt(db ethdb.Reader, hash common.Hash, config *params.ChainConfig) (*types.Receipt, common.Hash, uint64, uint64) {
func ReadReceipt(db ethdb.AncientReader, hash common.Hash, config *params.ChainConfig) (*types.Receipt, common.Hash, uint64, uint64) {
// Retrieve the context of the receipt based on the transaction hash
blockNumber := ReadTxLookupEntry(db, hash)
if blockNumber == nil {

57
core/rawdb/database.go
View File

@ -22,10 +22,44 @@ import (
"github.com/ethereum/go-ethereum/ethdb/memorydb"
)
// freezerdb is a databse wrapper that enabled freezer data retrievals.
type freezerdb struct {
ethdb.KeyValueStore
ethdb.Ancienter
}
// nofreezedb is a database wrapper that disables freezer data retrievals.
type nofreezedb struct {
ethdb.KeyValueStore
}
// Frozen returns nil as we don't have a backing chain freezer.
func (db *nofreezedb) Ancient(kind string, number uint64) ([]byte, error) {
return nil, errOutOfBounds
}
// NewDatabase creates a high level database on top of a given key-value data
// store without a freezer moving immutable chain segments into cold storage.
func NewDatabase(db ethdb.KeyValueStore) ethdb.Database {
return db
return &nofreezedb{
KeyValueStore: db,
}
}
// NewDatabaseWithFreezer creates a high level database on top of a given key-
// value data store with a freezer moving immutable chain segments into cold
// storage.
func NewDatabaseWithFreezer(db ethdb.KeyValueStore, freezer string, namespace string) (ethdb.Database, error) {
frdb, err := newFreezer(freezer, namespace)
if err != nil {
return nil, err
}
go frdb.freeze(db)
return &freezerdb{
KeyValueStore: db,
Ancienter: frdb,
}, nil
}
// NewMemoryDatabase creates an ephemeral in-memory key-value database without a
@ -34,9 +68,9 @@ func NewMemoryDatabase() ethdb.Database {
return NewDatabase(memorydb.New())
}
// NewMemoryDatabaseWithCap creates an ephemeral in-memory key-value database with
// an initial starting capacity, but without a freezer moving immutable chain
// segments into cold storage.
// NewMemoryDatabaseWithCap creates an ephemeral in-memory key-value database
// with an initial starting capacity, but without a freezer moving immutable
// chain segments into cold storage.
func NewMemoryDatabaseWithCap(size int) ethdb.Database {
return NewDatabase(memorydb.NewWithCap(size))
}
@ -50,3 +84,18 @@ func NewLevelDBDatabase(file string, cache int, handles int, namespace string) (
}
return NewDatabase(db), nil
}
// NewLevelDBDatabaseWithFreezer creates a persistent key-value database with a
// freezer moving immutable chain segments into cold storage.
func NewLevelDBDatabaseWithFreezer(file string, cache int, handles int, freezer string, namespace string) (ethdb.Database, error) {
kvdb, err := leveldb.New(file, cache, handles, namespace)
if err != nil {
return nil, err
}
frdb, err := NewDatabaseWithFreezer(kvdb, freezer, namespace)
if err != nil {
kvdb.Close()
return nil, err
}
return frdb, nil
}

276
core/rawdb/freezer.go Normal file
View File

@ -0,0 +1,276 @@
// Copyright 2018 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 rawdb
import (
"errors"
"fmt"
"math"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/metrics"
)
// errUnknownTable is returned if the user attempts to read from a table that is
// not tracked by the freezer.
var errUnknownTable = errors.New("unknown table")
const (
// freezerRecheckInterval is the frequency to check the key-value database for
// chain progression that might permit new blocks to be frozen into immutable
// storage.
freezerRecheckInterval = time.Minute
// freezerBlockGraduation is the number of confirmations a block must achieve
// before it becomes elligible for chain freezing. This must exceed any chain
// reorg depth, since the freezer also deletes all block siblings.
freezerBlockGraduation = 60000
// freezerBatchLimit is the maximum number of blocks to freeze in one batch
// before doing an fsync and deleting it from the key-value store.
freezerBatchLimit = 30000
)
// freezer is an memory mapped append-only database to store immutable chain data
// into flat files:
//
// - The append only nature ensures that disk writes are minimized.
// - The memory mapping ensures we can max out system memory for caching without
// reserving it for go-ethereum. This would also reduce the memory requirements
// of Geth, and thus also GC overhead.
type freezer struct {
tables map[string]*freezerTable // Data tables for storing everything
frozen uint64 // Number of blocks already frozen
}
// newFreezer creates a chain freezer that moves ancient chain data into
// append-only flat file containers.
func newFreezer(datadir string, namespace string) (*freezer, error) {
// Create the initial freezer object
var (
readMeter = metrics.NewRegisteredMeter(namespace+"ancient/read", nil)
writeMeter = metrics.NewRegisteredMeter(namespace+"ancient/write", nil)
)
// Open all the supported data tables
freezer := &freezer{
tables: make(map[string]*freezerTable),
}
for _, name := range []string{"hashes", "headers", "bodies", "receipts", "diffs"} {
table, err := newTable(datadir, name, readMeter, writeMeter)
if err != nil {
for _, table := range freezer.tables {
table.Close()
}
return nil, err
}
freezer.tables[name] = table
}
// Truncate all data tables to the same length
freezer.frozen = math.MaxUint64
for _, table := range freezer.tables {
if freezer.frozen > table.items {
freezer.frozen = table.items
}
}
for _, table := range freezer.tables {
if err := table.truncate(freezer.frozen); err != nil {
for _, table := range freezer.tables {
table.Close()
}
return nil, err
}
}
return freezer, nil
}
// Close terminates the chain freezer, unmapping all the data files.
func (f *freezer) Close() error {
var errs []error
for _, table := range f.tables {
if err := table.Close(); err != nil {
errs = append(errs, err)
}
}
if errs != nil {
return fmt.Errorf("%v", errs)
}
return nil
}
// sync flushes all data tables to disk.
func (f *freezer) sync() error {
var errs []error
for _, table := range f.tables {
if err := table.Sync(); err != nil {
errs = append(errs, err)
}
}
if errs != nil {
return fmt.Errorf("%v", errs)
}
return nil
}
// Ancient retrieves an ancient binary blob from the append-only immutable files.
func (f *freezer) Ancient(kind string, number uint64) ([]byte, error) {
if table := f.tables[kind]; table != nil {
return table.Retrieve(number)
}
return nil, errUnknownTable
}
// freeze is a background thread that periodically checks the blockchain for any
// import progress and moves ancient data from the fast database into the freezer.
//
// This functionality is deliberately broken off from block importing to avoid
// incurring additional data shuffling delays on block propagation.
func (f *freezer) freeze(db ethdb.KeyValueStore) {
nfdb := &nofreezedb{KeyValueStore: db}
for {
// Retrieve the freezing threshold. In theory we're interested only in full
// blocks post-sync, but that would keep the live database enormous during
// dast sync. By picking the fast block, we still get to deep freeze all the
// final immutable data without having to wait for sync to finish.
hash := ReadHeadFastBlockHash(nfdb)
if hash == (common.Hash{}) {
log.Debug("Current fast block hash unavailable") // new chain, empty database
time.Sleep(freezerRecheckInterval)
continue
}
number := ReadHeaderNumber(nfdb, hash)
switch {
case number == nil:
log.Error("Current fast block number unavailable", "hash", hash)
time.Sleep(freezerRecheckInterval)
continue
case *number < freezerBlockGraduation:
log.Debug("Current fast block not old enough", "number", *number, "hash", hash, "delay", freezerBlockGraduation)
time.Sleep(freezerRecheckInterval)
continue
case *number-freezerBlockGraduation <= f.frozen:
log.Debug("Ancient blocks frozen already", "number", *number, "hash", hash, "frozen", f.frozen)
time.Sleep(freezerRecheckInterval)
continue
}
head := ReadHeader(nfdb, hash, *number)
if head == nil {
log.Error("Current fast block unavailable", "number", *number, "hash", hash)
time.Sleep(freezerRecheckInterval)
continue
}
// Seems we have data ready to be frozen, process in usable batches
limit := *number - freezerBlockGraduation
if limit-f.frozen > freezerBatchLimit {
limit = f.frozen + freezerBatchLimit
}
var (
start = time.Now()
first = f.frozen
ancients = make([]common.Hash, 0, limit)
)
for f.frozen < limit {
// Retrieves all the components of the canonical block
hash := ReadCanonicalHash(nfdb, f.frozen)
if hash == (common.Hash{}) {
log.Error("Canonical hash missing, can't freeze", "number", f.frozen)
break
}
header := ReadHeaderRLP(nfdb, hash, f.frozen)
if len(header) == 0 {
log.Error("Block header missing, can't freeze", "number", f.frozen, "hash", hash)
break
}
body := ReadBodyRLP(nfdb, hash, f.frozen)
if len(body) == 0 {
log.Error("Block body missing, can't freeze", "number", f.frozen, "hash", hash)
break
}
receipts := ReadReceiptsRLP(nfdb, hash, f.frozen)
if len(receipts) == 0 {
log.Error("Block receipts missing, can't freeze", "number", f.frozen, "hash", hash)
break
}
td := ReadTdRLP(nfdb, hash, f.frozen)
if len(td) == 0 {
log.Error("Total difficulty missing, can't freeze", "number", f.frozen, "hash", hash)
break
}
// Inject all the components into the relevant data tables
if err := f.tables["hashes"].Append(f.frozen, hash[:]); err != nil {
log.Error("Failed to deep freeze hash", "number", f.frozen, "hash", hash, "err", err)
break
}
if err := f.tables["headers"].Append(f.frozen, header); err != nil {
log.Error("Failed to deep freeze header", "number", f.frozen, "hash", hash, "err", err)
break
}
if err := f.tables["bodies"].Append(f.frozen, body); err != nil {
log.Error("Failed to deep freeze body", "number", f.frozen, "hash", hash, "err", err)
break
}
if err := f.tables["receipts"].Append(f.frozen, receipts); err != nil {
log.Error("Failed to deep freeze receipts", "number", f.frozen, "hash", hash, "err", err)
break
}
if err := f.tables["diffs"].Append(f.frozen, td); err != nil {
log.Error("Failed to deep freeze difficulty", "number", f.frozen, "hash", hash, "err", err)
break
}
log.Trace("Deep froze ancient block", "number", f.frozen, "hash", hash)
atomic.AddUint64(&f.frozen, 1) // Only modify atomically
ancients = append(ancients, hash)
}
// Batch of blocks have been frozen, flush them before wiping from leveldb
if err := f.sync(); err != nil {
log.Crit("Failed to flush frozen tables", "err", err)
}
// Wipe out all data from the active database
batch := db.NewBatch()
for number := first; number < f.frozen; number++ {
for _, hash := range readAllHashes(db, number) {
if hash == ancients[number-first] {
deleteBlockWithoutNumber(batch, hash, number)
} else {
DeleteBlock(batch, hash, number)
}
}
}
if err := batch.Write(); err != nil {
log.Crit("Failed to delete frozen items", "err", err)
}
// Log something friendly for the user
context := []interface{}{
"blocks", f.frozen - first, "elapsed", common.PrettyDuration(time.Since(start)), "number", f.frozen - 1,
}
if n := len(ancients); n > 0 {
context = append(context, []interface{}{"hash", ancients[n-1]}...)
}
log.Info("Deep froze chain segment", context...)
// Avoid database thrashing with tiny writes
if f.frozen-first < freezerBatchLimit {
time.Sleep(freezerRecheckInterval)
}
}
}

284
core/rawdb/freezer_table.go Normal file
View File

@ -0,0 +1,284 @@
// Copyright 2018 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 rawdb
import (
"encoding/binary"
"errors"
"fmt"
"os"
"path/filepath"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/metrics"
"github.com/golang/snappy"
)
var (
// errClosed is returned if an operation attempts to read from or write to the
// freezer table after it has already been closed.
errClosed = errors.New("closed")
// errOutOfBounds is returned if the item requested is not contained within the
// freezer table.
errOutOfBounds = errors.New("out of bounds")
)
// freezerTable represents a single chained data table within the freezer (e.g. blocks).
// It consists of a data file (snappy encoded arbitrary data blobs) and an index
// file (uncompressed 64 bit indices into the data file).
type freezerTable struct {
content *os.File // File descriptor for the data content of the table
offsets *os.File // File descriptor for the index file of the table
items uint64 // Number of items stored in the table
bytes uint64 // Number of content bytes stored in the table
readMeter metrics.Meter // Meter for measuring the effective amount of data read
writeMeter metrics.Meter // Meter for measuring the effective amount of data written
logger log.Logger // Logger with database path and table name ambedded
lock sync.RWMutex // Mutex protecting the data file descriptors
}
// newTable opens a freezer table, creating the data and index files if they are
// non existent. Both files are truncated to the shortest common length to ensure
// they don't go out of sync.
func newTable(path string, name string, readMeter metrics.Meter, writeMeter metrics.Meter) (*freezerTable, error) {
// Ensure the containing directory exists and open the two data files
if err := os.MkdirAll(path, 0755); err != nil {
return nil, err
}
content, err := os.OpenFile(filepath.Join(path, name+".dat"), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
return nil, err
}
offsets, err := os.OpenFile(filepath.Join(path, name+".idx"), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
content.Close()
return nil, err
}
// Create the table and repair any past inconsistency
tab := &freezerTable{
content: content,
offsets: offsets,
readMeter: readMeter,
writeMeter: writeMeter,
logger: log.New("database", path, "table", name),
}
if err := tab.repair(); err != nil {
offsets.Close()
content.Close()
return nil, err
}
return tab, nil
}
// repair cross checks the content and the offsets file and truncates them to
// be in sync with each other after a potential crash / data loss.
func (t *freezerTable) repair() error {
// Create a temporary offset buffer to init files with and read offsts into
offset := make([]byte, 8)
// If we've just created the files, initialize the offsets with the 0 index
stat, err := t.offsets.Stat()
if err != nil {
return err
}
if stat.Size() == 0 {
if _, err := t.offsets.Write(offset); err != nil {
return err
}
}
// Ensure the offsets are a multiple of 8 bytes
if overflow := stat.Size() % 8; overflow != 0 {
t.offsets.Truncate(stat.Size() - overflow) // New file can't trigger this path
}
// Retrieve the file sizes and prepare for truncation
if stat, err = t.offsets.Stat(); err != nil {
return err
}
offsetsSize := stat.Size()
if stat, err = t.content.Stat(); err != nil {
return err
}
contentSize := stat.Size()
// Keep truncating both files until they come in sync
t.offsets.ReadAt(offset, offsetsSize-8)
contentExp := int64(binary.LittleEndian.Uint64(offset))
for contentExp != contentSize {
// Truncate the content file to the last offset pointer
if contentExp < contentSize {
t.logger.Warn("Truncating dangling content", "indexed", common.StorageSize(contentExp), "stored", common.StorageSize(contentSize))
if err := t.content.Truncate(contentExp); err != nil {
return err
}
contentSize = contentExp
}
// Truncate the offsets to point within the content file
if contentExp > contentSize {
t.logger.Warn("Truncating dangling offsets", "indexed", common.StorageSize(contentExp), "stored", common.StorageSize(contentSize))
if err := t.offsets.Truncate(offsetsSize - 8); err != nil {
return err
}
offsetsSize -= 8
t.offsets.ReadAt(offset, offsetsSize-8)
contentExp = int64(binary.LittleEndian.Uint64(offset))
}
}
// Ensure all reparation changes have been written to disk
if err := t.offsets.Sync(); err != nil {
return err
}
if err := t.content.Sync(); err != nil {
return err
}
// Update the item and byte counters and return
t.items = uint64(offsetsSize/8 - 1) // last index points to the end of the data file
t.bytes = uint64(contentSize)
t.logger.Debug("Chain freezer table opened", "items", t.items, "size", common.StorageSize(t.bytes))
return nil
}
// truncate discards any recent data above the provided threashold number.
func (t *freezerTable) truncate(items uint64) error {
// If out item count is corrent, don't do anything
if t.items <= items {
return nil
}
// Something's out of sync, truncate the table's offset index
t.logger.Warn("Truncating freezer table", "items", t.items, "limit", items)
if err := t.offsets.Truncate(int64(items+1) * 8); err != nil {
return err
}
// Calculate the new expected size of the data file and truncate it
offset := make([]byte, 8)
t.offsets.ReadAt(offset, int64(items)*8)
expected := binary.LittleEndian.Uint64(offset)
if err := t.content.Truncate(int64(expected)); err != nil {
return err
}
// All data files truncated, set internal counters and return
t.items, t.bytes = items, expected
return nil
}
// Close unmaps all active memory mapped regions.
func (t *freezerTable) Close() error {
t.lock.Lock()
defer t.lock.Unlock()
var errs []error
if err := t.offsets.Close(); err != nil {
errs = append(errs, err)
}
t.offsets = nil
if err := t.content.Close(); err != nil {
errs = append(errs, err)
}
t.content = nil
if errs != nil {
return fmt.Errorf("%v", errs)
}
return nil
}
// Append injects a binary blob at the end of the freezer table. The item index
// is a precautionary parameter to ensure data correctness, but the table will
// reject already existing data.
//
// Note, this method will *not* flush any data to disk so be sure to explicitly
// fsync before irreversibly deleting data from the database.
func (t *freezerTable) Append(item uint64, blob []byte) error {
// Ensure the table is still accessible
if t.offsets == nil || t.content == nil {
return errClosed
}
// Ensure only the next item can be written, nothing else
if t.items != item {
panic(fmt.Sprintf("appending unexpected item: want %d, have %d", t.items, item))
}
// Encode the blob and write it into the data file
blob = snappy.Encode(nil, blob)
if _, err := t.content.Write(blob); err != nil {
return err
}
t.bytes += uint64(len(blob))
offset := make([]byte, 8)
binary.LittleEndian.PutUint64(offset, t.bytes)
if _, err := t.offsets.Write(offset); err != nil {
return err
}
t.items++
t.writeMeter.Mark(int64(len(blob) + 8)) // 8 = 1 x 8 byte offset
return nil
}
// Retrieve looks up the data offset of an item with the given index and retrieves
// the raw binary blob from the data file.
func (t *freezerTable) Retrieve(item uint64) ([]byte, error) {
t.lock.RLock()
defer t.lock.RUnlock()
// Ensure the table and the item is accessible
if t.offsets == nil || t.content == nil {
return nil, errClosed
}
if t.items <= item {
return nil, errOutOfBounds
}
// Item reachable, retrieve the data content boundaries
offset := make([]byte, 8)
if _, err := t.offsets.ReadAt(offset, int64(item*8)); err != nil {
return nil, err
}
start := binary.LittleEndian.Uint64(offset)
if _, err := t.offsets.ReadAt(offset, int64((item+1)*8)); err != nil {
return nil, err
}
end := binary.LittleEndian.Uint64(offset)
// Retrieve the data itself, decompress and return
blob := make([]byte, end-start)
if _, err := t.content.ReadAt(blob, int64(start)); err != nil {
return nil, err
}
t.readMeter.Mark(int64(len(blob) + 16)) // 16 = 2 x 8 byte offset
return snappy.Decode(nil, blob)
}
// Sync pushes any pending data from memory out to disk. This is an expensive
// operation, so use it with care.
func (t *freezerTable) Sync() error {
if err := t.offsets.Sync(); err != nil {
return err
}
return t.content.Sync()
}

6
core/rawdb/table.go
View File

@ -50,6 +50,12 @@ func (t *table) Get(key []byte) ([]byte, error) {
return t.db.Get(append([]byte(t.prefix), key...))
}
// Ancient is a noop passthrough that just forwards the request to the underlying
// database.
func (t *table) Ancient(kind string, number uint64) ([]byte, error) {
return t.db.Ancient(kind, number)
}
// Put inserts the given value into the database at a prefixed version of the
// provided key.
func (t *table) Put(key []byte, value []byte) error {

2
eth/backend.go
View File

@ -120,7 +120,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
log.Info("Allocated trie memory caches", "clean", common.StorageSize(config.TrieCleanCache)*1024*1024, "dirty", common.StorageSize(config.TrieDirtyCache)*1024*1024)
// Assemble the Ethereum object
chainDb, err := ctx.OpenDatabase("chaindata", config.DatabaseCache, config.DatabaseHandles, "eth/db/chaindata/")
chainDb, err := ctx.OpenDatabaseWithFreezer("chaindata", config.DatabaseCache, config.DatabaseHandles, config.DatabaseFreezer, "eth/db/chaindata/")
if err != nil {
return nil, err
}

1
eth/config.go
View File

@ -114,6 +114,7 @@ type Config struct {
SkipBcVersionCheck bool `toml:"-"`
DatabaseHandles int `toml:"-"`
DatabaseCache int
DatabaseFreezer string
TrieCleanCache int
TrieDirtyCache int

15
ethdb/database.go
View File

@ -67,10 +67,23 @@ type KeyValueStore interface {
io.Closer
}
// Ancienter wraps the Ancient method for a backing immutable chain data store.
type Ancienter interface {
// Ancient retrieves an ancient binary blob from the append-only immutable files.
Ancient(kind string, number uint64) ([]byte, error)
}
// AncientReader contains the methods required to access both key-value as well as
// immutable ancient data.
type AncientReader interface {
Reader
Ancienter
}
// Database contains all the methods required by the high level database to not
// only access the key-value data store but also the chain freezer.
type Database interface {
Reader
AncientReader
Writer
Batcher
Iteratee

20
node/node.go
View File

@ -614,6 +614,26 @@ func (n *Node) OpenDatabase(name string, cache, handles int, namespace string) (
return rawdb.NewLevelDBDatabase(n.config.ResolvePath(name), cache, handles, namespace)
}
// OpenDatabaseWithFreezer opens an existing database with the given name (or
// creates one if no previous can be found) from within the node's data directory,
// also attaching a chain freezer to it that moves ancient chain data from the
// database to immutable append-only files. If the node is an ephemeral one, a
// memory database is returned.
func (n *Node) OpenDatabaseWithFreezer(name string, cache, handles int, freezer, namespace string) (ethdb.Database, error) {
if n.config.DataDir == "" {
return rawdb.NewMemoryDatabase(), nil
}
root := n.config.ResolvePath(name)
switch {
case freezer == "":
freezer = filepath.Join(root, "ancient")
case !filepath.IsAbs(freezer):
freezer = n.config.ResolvePath(freezer)
}
return rawdb.NewLevelDBDatabaseWithFreezer(root, cache, handles, freezer, namespace)
}
// ResolvePath returns the absolute path of a resource in the instance directory.
func (n *Node) ResolvePath(x string) string {
return n.config.ResolvePath(x)

25
node/service.go
View File

@ -17,6 +17,7 @@
package node
import (
"path/filepath"
"reflect"
"github.com/ethereum/go-ethereum/accounts"
@ -44,11 +45,27 @@ func (ctx *ServiceContext) OpenDatabase(name string, cache int, handles int, nam
if ctx.config.DataDir == "" {
return rawdb.NewMemoryDatabase(), nil
}
db, err := rawdb.NewLevelDBDatabase(ctx.config.ResolvePath(name), cache, handles, namespace)
if err != nil {
return nil, err
return rawdb.NewLevelDBDatabase(ctx.config.ResolvePath(name), cache, handles, namespace)
}
return db, nil
// OpenDatabaseWithFreezer opens an existing database with the given name (or
// creates one if no previous can be found) from within the node's data directory,
// also attaching a chain freezer to it that moves ancient chain data from the
// database to immutable append-only files. If the node is an ephemeral one, a
// memory database is returned.
func (ctx *ServiceContext) OpenDatabaseWithFreezer(name string, cache int, handles int, freezer string, namespace string) (ethdb.Database, error) {
if ctx.config.DataDir == "" {
return rawdb.NewMemoryDatabase(), nil
}
root := ctx.config.ResolvePath(name)
switch {
case freezer == "":
freezer = filepath.Join(root, "ancient")
case !filepath.IsAbs(freezer):
freezer = ctx.config.ResolvePath(freezer)
}
return rawdb.NewLevelDBDatabaseWithFreezer(root, cache, handles, freezer, namespace)
}
// ResolvePath resolves a user path into the data directory if that was relative