mirror of
https://bitbucket.org/s_l_teichmann/mtsatellite
synced 2024-12-23 16:50:18 +01:00
Removed locking from LevelDB entirely.
It is not needed because LevelDB itself handles concurreny issues and it causes a lot of contentions and massive lags.
This commit is contained in:
parent
aad612d097
commit
e4ad3a84d8
@ -6,7 +6,6 @@ package main
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import (
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import (
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"log"
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"log"
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"sync"
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"bitbucket.org/s_l_teichmann/mtsatellite/common"
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"bitbucket.org/s_l_teichmann/mtsatellite/common"
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@ -22,10 +21,6 @@ type LevelDBBackend struct {
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decoder common.KeyTranscoder
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decoder common.KeyTranscoder
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changeTracker *changeTracker
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changeTracker *changeTracker
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mutex sync.RWMutex
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priority *sync.Cond
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priorityCount int
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}
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}
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type LevelDBSession struct {
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type LevelDBSession struct {
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@ -76,7 +71,7 @@ func NewLeveDBBackend(
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encoder: encoder,
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encoder: encoder,
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decoder: decoder,
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decoder: decoder,
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changeTracker: changeTracker,
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changeTracker: changeTracker,
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priority: sync.NewCond(new(sync.Mutex))}
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}
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if !interleaved {
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if !interleaved {
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if err = ldb.buildCoverage(); err != nil {
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if err = ldb.buildCoverage(); err != nil {
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@ -88,28 +83,6 @@ func NewLeveDBBackend(
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return
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return
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}
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}
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func (ldb *LevelDBBackend) suspend() {
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ldb.priority.L.Lock()
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for ldb.priorityCount > 0 {
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ldb.priority.Wait()
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}
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ldb.priority.L.Unlock()
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}
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func (ldb *LevelDBBackend) grab() {
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ldb.priority.L.Lock()
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ldb.priorityCount++
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ldb.priority.L.Unlock()
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}
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func (ldb *LevelDBBackend) ungrab() {
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ldb.priority.L.Lock()
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if ldb.priorityCount--; ldb.priorityCount <= 0 {
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ldb.priority.Broadcast()
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}
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ldb.priority.L.Unlock()
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}
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func (ldb *LevelDBBackend) buildCoverage() error {
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func (ldb *LevelDBBackend) buildCoverage() error {
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log.Println("INFO: Start building coverage index (this may take some time)...")
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log.Println("INFO: Start building coverage index (this may take some time)...")
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@ -135,18 +108,6 @@ func (ldb *LevelDBBackend) buildCoverage() error {
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return nil
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return nil
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}
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}
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func (ldb *LevelDBBackend) doRead(f func(db *leveldb.DB)) {
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ldb.mutex.RLock()
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f(ldb.db)
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ldb.mutex.RUnlock()
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}
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func (ldb *LevelDBBackend) doWrite(f func(db *leveldb.DB)) {
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ldb.mutex.Lock()
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f(ldb.db)
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ldb.mutex.Unlock()
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}
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func (ldb *LevelDBBackend) NewSession() (Session, error) {
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func (ldb *LevelDBBackend) NewSession() (Session, error) {
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return &LevelDBSession{ldb, nil}, nil
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return &LevelDBSession{ldb, nil}, nil
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}
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}
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@ -170,23 +131,21 @@ func (ldbs *LevelDBSession) Del(hash, key []byte) (success bool, err error) {
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if key, err = ldbs.backend.decoder(key); err != nil {
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if key, err = ldbs.backend.decoder(key); err != nil {
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return
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return
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}
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}
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ldbs.backend.doWrite(func(db *leveldb.DB) {
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ro := leveldb.NewReadOptions()
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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defer ro.Close()
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var data []byte
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var data []byte
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data, err = ldbs.backend.db.Get(ro, key)
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data, err = ldbs.backend.db.Get(ro, key)
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if err != nil {
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if err != nil {
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return
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return
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}
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}
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if data == nil {
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if data == nil {
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success = false
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success = false
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return
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return
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}
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}
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success = true
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success = true
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wo := leveldb.NewWriteOptions()
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wo := leveldb.NewWriteOptions()
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defer wo.Close()
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defer wo.Close()
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err = ldbs.backend.db.Delete(wo, key)
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err = ldbs.backend.db.Delete(wo, key)
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})
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return
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return
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}
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}
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@ -194,19 +153,14 @@ func (ldbs *LevelDBSession) Fetch(hash, key []byte) (value []byte, err error) {
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if key, err = ldbs.backend.decoder(key); err != nil {
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if key, err = ldbs.backend.decoder(key); err != nil {
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return
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return
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}
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}
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ldbs.backend.doRead(func(db *leveldb.DB) {
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ro := leveldb.NewReadOptions()
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ldbs.backend.grab()
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value, err = ldbs.backend.db.Get(ro, key)
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defer ldbs.backend.ungrab()
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//if err != nil {
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// log.Printf("Fetch key '%s' failed.\n", key)
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ro := leveldb.NewReadOptions()
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//} else {
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value, err = ldbs.backend.db.Get(ro, key)
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// log.Printf("Fetch key = '%s' len(value) = %d\n", key, len(value))
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//if err != nil {
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//}
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// log.Printf("Fetch key '%s' failed.\n", key)
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ro.Close()
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//} else {
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// log.Printf("Fetch key = '%s' len(value) = %d\n", key, len(value))
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//}
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ro.Close()
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})
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return
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return
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}
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}
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@ -230,20 +184,16 @@ func (ldbs *LevelDBSession) Store(hash, key, value []byte) (exists bool, err err
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if key, err = ldbs.backend.decoder(key); err != nil {
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if key, err = ldbs.backend.decoder(key); err != nil {
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return
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return
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}
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}
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ldbs.backend.doWrite(func(db *leveldb.DB) {
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if exists, err = keyExists(ldbs.backend.db, key); err != nil {
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ldbs.backend.grab()
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return
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defer ldbs.backend.ungrab()
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}
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if exists, err = keyExists(db, key); err != nil {
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if ldbs.tx != nil {
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return
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ldbs.tx.Put(key, value)
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}
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return
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if ldbs.tx != nil {
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}
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ldbs.tx.Put(key, value)
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wo := leveldb.NewWriteOptions()
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return
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err = ldbs.backend.db.Put(wo, key, value)
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}
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wo.Close()
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wo := leveldb.NewWriteOptions()
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err = db.Put(wo, key, value)
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wo.Close()
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})
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if err != nil {
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if err != nil {
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return
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return
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}
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}
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@ -276,13 +226,11 @@ func (ldbs *LevelDBSession) CommitTransaction() (err error) {
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return
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return
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}
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}
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ldbs.tx = nil
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ldbs.tx = nil
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ldbs.backend.doWrite(func(db *leveldb.DB) {
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wo := leveldb.NewWriteOptions()
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wo := leveldb.NewWriteOptions()
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wo.SetSync(true)
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wo.SetSync(true)
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err = ldbs.backend.db.Write(wo, tx)
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err = db.Write(wo, tx)
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wo.Close()
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wo.Close()
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tx.Close()
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tx.Close()
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})
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return
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return
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}
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}
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@ -290,8 +238,6 @@ func (ldbs *LevelDBSession) AllKeys(
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hash []byte,
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hash []byte,
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done <-chan struct{}) (<-chan []byte, int, error) {
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done <-chan struct{}) (<-chan []byte, int, error) {
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ldbs.backend.mutex.RLock()
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ro := leveldb.NewReadOptions()
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ro := leveldb.NewReadOptions()
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ro.SetFillCache(false)
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ro.SetFillCache(false)
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@ -305,14 +251,12 @@ func (ldbs *LevelDBSession) AllKeys(
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if err := it.GetError(); err != nil {
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if err := it.GetError(); err != nil {
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it.Close()
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it.Close()
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ro.Close()
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ro.Close()
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ldbs.backend.mutex.RUnlock()
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return nil, n, err
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return nil, n, err
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}
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}
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keys := make(chan []byte)
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keys := make(chan []byte)
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go func() {
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go func() {
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ldbs.backend.mutex.RUnlock()
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defer ro.Close()
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defer ro.Close()
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defer close(keys)
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defer close(keys)
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defer it.Close()
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defer it.Close()
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@ -371,8 +315,6 @@ func (ldbs *LevelDBSession) plainSpatialQuery(
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go func() {
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go func() {
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defer close(blocks)
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defer close(blocks)
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ldbs.backend.mutex.RLock()
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defer ldbs.backend.mutex.RUnlock()
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ro := leveldb.NewReadOptions()
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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defer ro.Close()
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@ -433,8 +375,6 @@ func (ldbs *LevelDBSession) interleavedSpatialQuery(
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go func() {
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go func() {
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defer close(blocks)
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defer close(blocks)
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ldbs.backend.mutex.RLock()
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defer ldbs.backend.mutex.RUnlock()
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ro := leveldb.NewReadOptions()
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ro := leveldb.NewReadOptions()
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defer ro.Close()
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defer ro.Close()
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@ -455,7 +395,6 @@ func (ldbs *LevelDBSession) interleavedSpatialQuery(
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//log.Printf("seeking to: %d\n", zmin)
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//log.Printf("seeking to: %d\n", zmin)
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it.Seek(common.ToBigEndian(zmin))
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it.Seek(common.ToBigEndian(zmin))
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for it.Valid() {
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for it.Valid() {
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ldbs.backend.suspend()
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zcode := common.FromBigEndian(it.Key())
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zcode := common.FromBigEndian(it.Key())
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if zcode > zmax {
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if zcode > zmax {
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