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markset_badger.go
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markset_badger.go
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package splitstore
import (
"os"
"path/filepath"
"runtime"
"sync"
"github.com/dgraph-io/badger/v2"
"github.com/dgraph-io/badger/v2/options"
"github.com/ipfs/go-cid"
"go.uber.org/zap"
"golang.org/x/xerrors"
"github.com/filecoin-project/lotus/system"
)
type BadgerMarkSetEnv struct {
path string
}
var _ MarkSetEnv = (*BadgerMarkSetEnv)(nil)
type BadgerMarkSet struct {
mx sync.RWMutex
cond sync.Cond
pend map[string]struct{}
writing map[int]map[string]struct{}
writers int
seqno int
version int
persist bool
db *badger.DB
path string
}
var _ MarkSet = (*BadgerMarkSet)(nil)
var badgerMarkSetBatchSize = 16384
func NewBadgerMarkSetEnv(path string) (MarkSetEnv, error) {
msPath := filepath.Join(path, "markset.badger")
err := os.MkdirAll(msPath, 0755) //nolint:gosec
if err != nil {
return nil, xerrors.Errorf("error creating markset directory: %w", err)
}
return &BadgerMarkSetEnv{path: msPath}, nil
}
func (e *BadgerMarkSetEnv) New(name string, sizeHint int64) (MarkSet, error) {
path := filepath.Join(e.path, name)
db, err := openBadgerDB(path, false)
if err != nil {
return nil, xerrors.Errorf("error creating badger db: %w", err)
}
ms := &BadgerMarkSet{
pend: make(map[string]struct{}),
writing: make(map[int]map[string]struct{}),
db: db,
path: path,
}
ms.cond.L = &ms.mx
return ms, nil
}
func (e *BadgerMarkSetEnv) Recover(name string) (MarkSet, error) {
path := filepath.Join(e.path, name)
if _, err := os.Stat(path); err != nil {
return nil, xerrors.Errorf("error stating badger db path: %w", err)
}
db, err := openBadgerDB(path, true)
if err != nil {
return nil, xerrors.Errorf("error creating badger db: %w", err)
}
ms := &BadgerMarkSet{
pend: make(map[string]struct{}),
writing: make(map[int]map[string]struct{}),
db: db,
path: path,
persist: true,
}
ms.cond.L = &ms.mx
return ms, nil
}
func (e *BadgerMarkSetEnv) Close() error {
return nil
}
func (s *BadgerMarkSet) BeginCriticalSection() error {
s.mx.Lock()
if s.persist {
s.mx.Unlock()
return nil
}
var write bool
var seqno int
if len(s.pend) > 0 {
write = true
seqno = s.nextBatch()
}
s.persist = true
s.mx.Unlock()
if write {
// all writes sync once perist is true
return s.write(seqno)
}
// wait for any pending writes and sync
s.mx.Lock()
for s.writers > 0 {
s.cond.Wait()
}
s.mx.Unlock()
return s.db.Sync()
}
func (s *BadgerMarkSet) EndCriticalSection() {
s.mx.Lock()
defer s.mx.Unlock()
s.persist = false
}
func (s *BadgerMarkSet) Mark(c cid.Cid) error {
s.mx.Lock()
if s.pend == nil {
s.mx.Unlock()
return errMarkSetClosed
}
write, seqno := s.put(string(c.Hash()))
s.mx.Unlock()
if write {
return s.write(seqno)
}
return nil
}
func (s *BadgerMarkSet) MarkMany(batch []cid.Cid) error {
s.mx.Lock()
if s.pend == nil {
s.mx.Unlock()
return errMarkSetClosed
}
write, seqno := s.putMany(batch)
s.mx.Unlock()
if write {
return s.write(seqno)
}
return nil
}
func (s *BadgerMarkSet) Has(c cid.Cid) (bool, error) {
s.mx.RLock()
defer s.mx.RUnlock()
key := c.Hash()
pendKey := string(key)
has, err := s.tryPending(pendKey)
if has || err != nil {
return has, err
}
return s.tryDB(key)
}
func (s *BadgerMarkSet) Visit(c cid.Cid) (bool, error) {
key := c.Hash()
pendKey := string(key)
s.mx.RLock()
has, err := s.tryPending(pendKey)
if has || err != nil {
s.mx.RUnlock()
return false, err
}
has, err = s.tryDB(key)
if has || err != nil {
s.mx.RUnlock()
return false, err
}
// we need to upgrade the lock to exclusive in order to write; take the version count to see
// if there was another write while we were upgrading
version := s.version
s.mx.RUnlock()
s.mx.Lock()
// we have to do the check dance again
has, err = s.tryPending(pendKey)
if has || err != nil {
s.mx.Unlock()
return false, err
}
if version != s.version {
// something was written to the db, we need to check it
has, err = s.tryDB(key)
if has || err != nil {
s.mx.Unlock()
return false, err
}
}
write, seqno := s.put(pendKey)
s.mx.Unlock()
if write {
err = s.write(seqno)
}
return true, err
}
// reader holds the (r)lock
func (s *BadgerMarkSet) tryPending(key string) (has bool, err error) {
if s.pend == nil {
return false, errMarkSetClosed
}
if _, ok := s.pend[key]; ok {
return true, nil
}
for _, wr := range s.writing {
if _, ok := wr[key]; ok {
return true, nil
}
}
return false, nil
}
func (s *BadgerMarkSet) tryDB(key []byte) (has bool, err error) {
err = s.db.View(func(txn *badger.Txn) error {
_, err := txn.Get(key)
return err
})
switch err {
case nil:
return true, nil
case badger.ErrKeyNotFound:
return false, nil
default:
return false, err
}
}
// writer holds the exclusive lock
func (s *BadgerMarkSet) put(key string) (write bool, seqno int) {
s.pend[key] = struct{}{}
if !s.persist && len(s.pend) < badgerMarkSetBatchSize {
return false, 0
}
seqno = s.nextBatch()
return true, seqno
}
func (s *BadgerMarkSet) putMany(batch []cid.Cid) (write bool, seqno int) {
for _, c := range batch {
key := string(c.Hash())
s.pend[key] = struct{}{}
}
if !s.persist && len(s.pend) < badgerMarkSetBatchSize {
return false, 0
}
seqno = s.nextBatch()
return true, seqno
}
func (s *BadgerMarkSet) nextBatch() int {
seqno := s.seqno
s.seqno++
s.writing[seqno] = s.pend
s.pend = make(map[string]struct{})
return seqno
}
func (s *BadgerMarkSet) write(seqno int) (err error) {
s.mx.Lock()
if s.pend == nil {
s.mx.Unlock()
return errMarkSetClosed
}
pend := s.writing[seqno]
s.writers++
s.mx.Unlock()
defer func() {
s.mx.Lock()
defer s.mx.Unlock()
if err == nil {
delete(s.writing, seqno)
s.version++
}
s.writers--
if s.writers == 0 {
s.cond.Broadcast()
}
}()
empty := []byte{} // not nil
batch := s.db.NewWriteBatch()
defer batch.Cancel()
for k := range pend {
if err = batch.Set([]byte(k), empty); err != nil {
return xerrors.Errorf("error setting batch: %w", err)
}
}
err = batch.Flush()
if err != nil {
return xerrors.Errorf("error flushing batch to badger markset: %w", err)
}
s.mx.RLock()
persist := s.persist
s.mx.RUnlock()
if persist && !system.BadgerFsyncDisable { // WARNING: disabling sync makes recovery from crash during critical section unsound
return s.db.Sync()
}
return nil
}
func (s *BadgerMarkSet) Close() error {
s.mx.Lock()
defer s.mx.Unlock()
if s.pend == nil {
return nil
}
for s.writers > 0 {
s.cond.Wait()
}
s.pend = nil
db := s.db
s.db = nil
return closeBadgerDB(db, s.path, s.persist)
}
func openBadgerDB(path string, recover bool) (*badger.DB, error) {
// if it is not a recovery, clean up first
if !recover {
err := os.RemoveAll(path)
if err != nil {
return nil, xerrors.Errorf("error clearing markset directory: %w", err)
}
err = os.MkdirAll(path, 0755) //nolint:gosec
if err != nil {
return nil, xerrors.Errorf("error creating markset directory: %w", err)
}
}
opts := badger.DefaultOptions(path)
// we manually sync when we are in critical section
opts.SyncWrites = false
// no need to do that
opts.CompactL0OnClose = false
// we store hashes, not much to gain by compression
opts.Compression = options.None
// Note: We use FileIO for loading modes to avoid memory thrashing and interference
// between the system blockstore and the markset.
// It was observed that using the default memory mapped option resulted in
// significant interference and unacceptably high block validation times once the markset
// exceeded 1GB in size.
opts.TableLoadingMode = options.FileIO
opts.ValueLogLoadingMode = options.FileIO
// We increase the number of L0 tables before compaction to make it unlikely to
// be necessary.
opts.NumLevelZeroTables = 20 // default is 5
opts.NumLevelZeroTablesStall = 30 // default is 10
// increase the number of compactors from default 2 so that if we ever have to
// compact, it is fast
if runtime.NumCPU()/2 > opts.NumCompactors {
opts.NumCompactors = runtime.NumCPU() / 2
}
opts.Logger = &badgerLogger{
SugaredLogger: log.Desugar().WithOptions(zap.AddCallerSkip(1)).Sugar(),
skip2: log.Desugar().WithOptions(zap.AddCallerSkip(2)).Sugar(),
}
return badger.Open(opts)
}
func closeBadgerDB(db *badger.DB, path string, persist bool) error {
err := db.Close()
if err != nil {
return xerrors.Errorf("error closing badger markset: %w", err)
}
if persist {
return nil
}
err = os.RemoveAll(path)
if err != nil {
return xerrors.Errorf("error deleting badger markset: %w", err)
}
return nil
}
// badger logging through go-log
type badgerLogger struct {
*zap.SugaredLogger
skip2 *zap.SugaredLogger
}
func (b *badgerLogger) Warningf(format string, args ...interface{}) {}
func (b *badgerLogger) Infof(format string, args ...interface{}) {}
func (b *badgerLogger) Debugf(format string, args ...interface{}) {}