/
scorch.go
655 lines (556 loc) · 16.6 KB
/
scorch.go
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// Copyright (c) 2018 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package scorch
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"sync"
"sync/atomic"
"time"
"github.com/RoaringBitmap/roaring"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/document"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/index/scorch/segment"
"github.com/blevesearch/bleve/index/scorch/segment/zap"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
bolt "github.com/etcd-io/bbolt"
)
const Name = "scorch"
const Version uint8 = 2
var ErrClosed = fmt.Errorf("scorch closed")
type Scorch struct {
nextSegmentID uint64
stats Stats
iStats internalStats
readOnly bool
version uint8
config map[string]interface{}
analysisQueue *index.AnalysisQueue
path string
unsafeBatch bool
rootLock sync.RWMutex
root *IndexSnapshot // holds 1 ref-count on the root
rootPersisted []chan error // closed when root is persisted
persistedCallbacks []index.BatchCallback
nextSnapshotEpoch uint64
eligibleForRemoval []uint64 // Index snapshot epochs that are safe to GC.
ineligibleForRemoval map[string]bool // Filenames that should not be GC'ed yet.
numSnapshotsToKeep int
closeCh chan struct{}
introductions chan *segmentIntroduction
persists chan *persistIntroduction
merges chan *segmentMerge
introducerNotifier chan *epochWatcher
revertToSnapshots chan *snapshotReversion
persisterNotifier chan *epochWatcher
rootBolt *bolt.DB
asyncTasks sync.WaitGroup
onEvent func(event Event)
onAsyncError func(err error)
pauseLock sync.RWMutex
pauseCount uint64
}
type internalStats struct {
persistEpoch uint64
persistSnapshotSize uint64
mergeEpoch uint64
mergeSnapshotSize uint64
newSegBufBytesAdded uint64
newSegBufBytesRemoved uint64
analysisBytesAdded uint64
analysisBytesRemoved uint64
}
func NewScorch(storeName string,
config map[string]interface{},
analysisQueue *index.AnalysisQueue) (index.Index, error) {
rv := &Scorch{
version: Version,
config: config,
analysisQueue: analysisQueue,
nextSnapshotEpoch: 1,
closeCh: make(chan struct{}),
ineligibleForRemoval: map[string]bool{},
}
rv.root = &IndexSnapshot{parent: rv, refs: 1, creator: "NewScorch"}
ro, ok := config["read_only"].(bool)
if ok {
rv.readOnly = ro
}
ub, ok := config["unsafe_batch"].(bool)
if ok {
rv.unsafeBatch = ub
}
ecbName, ok := config["eventCallbackName"].(string)
if ok {
rv.onEvent = RegistryEventCallbacks[ecbName]
}
aecbName, ok := config["asyncErrorCallbackName"].(string)
if ok {
rv.onAsyncError = RegistryAsyncErrorCallbacks[aecbName]
}
return rv, nil
}
func (s *Scorch) paused() uint64 {
s.pauseLock.Lock()
pc := s.pauseCount
s.pauseLock.Unlock()
return pc
}
func (s *Scorch) incrPause() {
s.pauseLock.Lock()
s.pauseCount++
s.pauseLock.Unlock()
}
func (s *Scorch) decrPause() {
s.pauseLock.Lock()
s.pauseCount--
s.pauseLock.Unlock()
}
func (s *Scorch) fireEvent(kind EventKind, dur time.Duration) {
if s.onEvent != nil {
s.incrPause()
s.onEvent(Event{Kind: kind, Scorch: s, Duration: dur})
s.decrPause()
}
}
func (s *Scorch) fireAsyncError(err error) {
if s.onAsyncError != nil {
s.onAsyncError(err)
}
atomic.AddUint64(&s.stats.TotOnErrors, 1)
}
func (s *Scorch) Open() error {
err := s.openBolt()
if err != nil {
return err
}
s.asyncTasks.Add(1)
go s.mainLoop()
if !s.readOnly && s.path != "" {
s.asyncTasks.Add(1)
go s.persisterLoop()
s.asyncTasks.Add(1)
go s.mergerLoop()
}
return nil
}
func (s *Scorch) openBolt() error {
var ok bool
s.path, ok = s.config["path"].(string)
if !ok {
return fmt.Errorf("must specify path")
}
if s.path == "" {
s.unsafeBatch = true
}
var rootBoltOpt *bolt.Options
if s.readOnly {
rootBoltOpt = &bolt.Options{
ReadOnly: true,
}
} else {
if s.path != "" {
err := os.MkdirAll(s.path, 0700)
if err != nil {
return err
}
}
}
rootBoltPath := s.path + string(os.PathSeparator) + "root.bolt"
var err error
if s.path != "" {
s.rootBolt, err = bolt.Open(rootBoltPath, 0600, rootBoltOpt)
if err != nil {
return err
}
// now see if there is any existing state to load
err = s.loadFromBolt()
if err != nil {
_ = s.Close()
return err
}
}
atomic.StoreUint64(&s.stats.TotFileSegmentsAtRoot, uint64(len(s.root.segment)))
s.introductions = make(chan *segmentIntroduction)
s.persists = make(chan *persistIntroduction)
s.merges = make(chan *segmentMerge)
s.introducerNotifier = make(chan *epochWatcher, 1)
s.revertToSnapshots = make(chan *snapshotReversion)
s.persisterNotifier = make(chan *epochWatcher, 1)
if !s.readOnly && s.path != "" {
err := s.removeOldZapFiles() // Before persister or merger create any new files.
if err != nil {
_ = s.Close()
return err
}
}
s.numSnapshotsToKeep = NumSnapshotsToKeep
if v, ok := s.config["numSnapshotsToKeep"]; ok {
var t int
if t, err = parseToInteger(v); err != nil {
return fmt.Errorf("numSnapshotsToKeep parse err: %v", err)
}
if t > 0 {
s.numSnapshotsToKeep = t
}
}
return nil
}
func (s *Scorch) Close() (err error) {
startTime := time.Now()
defer func() {
s.fireEvent(EventKindClose, time.Since(startTime))
}()
s.fireEvent(EventKindCloseStart, 0)
// signal to async tasks we want to close
close(s.closeCh)
// wait for them to close
s.asyncTasks.Wait()
// now close the root bolt
if s.rootBolt != nil {
err = s.rootBolt.Close()
s.rootLock.Lock()
if s.root != nil {
err2 := s.root.DecRef()
if err == nil {
err = err2
}
}
s.root = nil
s.rootLock.Unlock()
}
return
}
func (s *Scorch) Update(doc *document.Document) error {
b := index.NewBatch()
b.Update(doc)
return s.Batch(b)
}
func (s *Scorch) Delete(id string) error {
b := index.NewBatch()
b.Delete(id)
return s.Batch(b)
}
// Batch applices a batch of changes to the index atomically
func (s *Scorch) Batch(batch *index.Batch) (err error) {
start := time.Now()
defer func() {
s.fireEvent(EventKindBatchIntroduction, time.Since(start))
}()
resultChan := make(chan *index.AnalysisResult, len(batch.IndexOps))
var numUpdates uint64
var numDeletes uint64
var numPlainTextBytes uint64
var ids []string
for docID, doc := range batch.IndexOps {
if doc != nil {
// insert _id field
doc.AddField(document.NewTextFieldCustom("_id", nil, []byte(doc.ID), document.IndexField|document.StoreField, nil))
numUpdates++
numPlainTextBytes += doc.NumPlainTextBytes()
} else {
numDeletes++
}
ids = append(ids, docID)
}
// FIXME could sort ids list concurrent with analysis?
if numUpdates > 0 {
go func() {
for _, doc := range batch.IndexOps {
if doc != nil {
aw := index.NewAnalysisWork(s, doc, resultChan)
// put the work on the queue
s.analysisQueue.Queue(aw)
}
}
}()
}
// wait for analysis result
analysisResults := make([]*index.AnalysisResult, int(numUpdates))
var itemsDeQueued uint64
var totalAnalysisSize int
for itemsDeQueued < numUpdates {
result := <-resultChan
resultSize := result.Size()
atomic.AddUint64(&s.iStats.analysisBytesAdded, uint64(resultSize))
totalAnalysisSize += resultSize
analysisResults[itemsDeQueued] = result
itemsDeQueued++
}
close(resultChan)
defer atomic.AddUint64(&s.iStats.analysisBytesRemoved, uint64(totalAnalysisSize))
atomic.AddUint64(&s.stats.TotAnalysisTime, uint64(time.Since(start)))
indexStart := time.Now()
// notify handlers that we're about to introduce a segment
s.fireEvent(EventKindBatchIntroductionStart, 0)
var newSegment segment.Segment
var bufBytes uint64
if len(analysisResults) > 0 {
newSegment, bufBytes, err = zap.AnalysisResultsToSegmentBase(analysisResults, DefaultChunkFactor)
if err != nil {
return err
}
atomic.AddUint64(&s.iStats.newSegBufBytesAdded, bufBytes)
} else {
atomic.AddUint64(&s.stats.TotBatchesEmpty, 1)
}
err = s.prepareSegment(newSegment, ids, batch.InternalOps, batch.PersistedCallback())
if err != nil {
if newSegment != nil {
_ = newSegment.Close()
}
atomic.AddUint64(&s.stats.TotOnErrors, 1)
} else {
atomic.AddUint64(&s.stats.TotUpdates, numUpdates)
atomic.AddUint64(&s.stats.TotDeletes, numDeletes)
atomic.AddUint64(&s.stats.TotBatches, 1)
atomic.AddUint64(&s.stats.TotIndexedPlainTextBytes, numPlainTextBytes)
}
atomic.AddUint64(&s.iStats.newSegBufBytesRemoved, bufBytes)
atomic.AddUint64(&s.stats.TotIndexTime, uint64(time.Since(indexStart)))
return err
}
func (s *Scorch) prepareSegment(newSegment segment.Segment, ids []string,
internalOps map[string][]byte, persistedCallback index.BatchCallback) error {
// new introduction
introduction := &segmentIntroduction{
id: atomic.AddUint64(&s.nextSegmentID, 1),
data: newSegment,
ids: ids,
obsoletes: make(map[uint64]*roaring.Bitmap),
internal: internalOps,
applied: make(chan error),
persistedCallback: persistedCallback,
}
if !s.unsafeBatch {
introduction.persisted = make(chan error, 1)
}
// optimistically prepare obsoletes outside of rootLock
s.rootLock.RLock()
root := s.root
root.AddRef()
s.rootLock.RUnlock()
defer func() { _ = root.DecRef() }()
for _, seg := range root.segment {
delta, err := seg.segment.DocNumbers(ids)
if err != nil {
return err
}
introduction.obsoletes[seg.id] = delta
}
introStartTime := time.Now()
s.introductions <- introduction
// block until this segment is applied
err := <-introduction.applied
if err != nil {
return err
}
if introduction.persisted != nil {
err = <-introduction.persisted
}
introTime := uint64(time.Since(introStartTime))
atomic.AddUint64(&s.stats.TotBatchIntroTime, introTime)
if atomic.LoadUint64(&s.stats.MaxBatchIntroTime) < introTime {
atomic.StoreUint64(&s.stats.MaxBatchIntroTime, introTime)
}
return err
}
func (s *Scorch) SetInternal(key, val []byte) error {
b := index.NewBatch()
b.SetInternal(key, val)
return s.Batch(b)
}
func (s *Scorch) DeleteInternal(key []byte) error {
b := index.NewBatch()
b.DeleteInternal(key)
return s.Batch(b)
}
// Reader returns a low-level accessor on the index data. Close it to
// release associated resources.
func (s *Scorch) Reader() (index.IndexReader, error) {
return s.currentSnapshot(), nil
}
func (s *Scorch) currentSnapshot() *IndexSnapshot {
s.rootLock.RLock()
rv := s.root
if rv != nil {
rv.AddRef()
}
s.rootLock.RUnlock()
return rv
}
func (s *Scorch) Stats() json.Marshaler {
return &s.stats
}
func (s *Scorch) diskFileStats(rootSegmentPaths map[string]struct{}) (uint64,
uint64, uint64) {
var numFilesOnDisk, numBytesUsedDisk, numBytesOnDiskByRoot uint64
if s.path != "" {
finfos, err := ioutil.ReadDir(s.path)
if err == nil {
for _, finfo := range finfos {
if !finfo.IsDir() {
numBytesUsedDisk += uint64(finfo.Size())
numFilesOnDisk++
if rootSegmentPaths != nil {
fname := s.path + string(os.PathSeparator) + finfo.Name()
if _, fileAtRoot := rootSegmentPaths[fname]; fileAtRoot {
numBytesOnDiskByRoot += uint64(finfo.Size())
}
}
}
}
}
}
// if no root files path given, then consider all disk files.
if rootSegmentPaths == nil {
return numFilesOnDisk, numBytesUsedDisk, numBytesUsedDisk
}
return numFilesOnDisk, numBytesUsedDisk, numBytesOnDiskByRoot
}
func (s *Scorch) rootDiskSegmentsPaths() map[string]struct{} {
rv := make(map[string]struct{}, len(s.root.segment))
for _, segmentSnapshot := range s.root.segment {
switch seg := segmentSnapshot.segment.(type) {
case *zap.Segment:
rv[seg.Path()] = struct{}{}
}
}
return rv
}
func (s *Scorch) StatsMap() map[string]interface{} {
m := s.stats.ToMap()
s.rootLock.RLock()
rootSegPaths := s.rootDiskSegmentsPaths()
m["CurFilesIneligibleForRemoval"] = uint64(len(s.ineligibleForRemoval))
s.rootLock.RUnlock()
numFilesOnDisk, numBytesUsedDisk, numBytesOnDiskByRoot := s.diskFileStats(rootSegPaths)
m["CurOnDiskBytes"] = numBytesUsedDisk
m["CurOnDiskFiles"] = numFilesOnDisk
// TODO: consider one day removing these backwards compatible
// names for apps using the old names
m["updates"] = m["TotUpdates"]
m["deletes"] = m["TotDeletes"]
m["batches"] = m["TotBatches"]
m["errors"] = m["TotOnErrors"]
m["analysis_time"] = m["TotAnalysisTime"]
m["index_time"] = m["TotIndexTime"]
m["term_searchers_started"] = m["TotTermSearchersStarted"]
m["term_searchers_finished"] = m["TotTermSearchersFinished"]
m["num_plain_text_bytes_indexed"] = m["TotIndexedPlainTextBytes"]
m["num_items_introduced"] = m["TotIntroducedItems"]
m["num_items_persisted"] = m["TotPersistedItems"]
m["num_recs_to_persist"] = m["TotItemsToPersist"]
// total disk bytes found in index directory inclusive of older snapshots
m["num_bytes_used_disk"] = numBytesUsedDisk
// total disk bytes by the latest root index, exclusive of older snapshots
m["num_bytes_used_disk_by_root"] = numBytesOnDiskByRoot
m["num_files_on_disk"] = numFilesOnDisk
m["num_root_memorysegments"] = m["TotMemorySegmentsAtRoot"]
m["num_root_filesegments"] = m["TotFileSegmentsAtRoot"]
m["num_persister_nap_pause_completed"] = m["TotPersisterNapPauseCompleted"]
m["num_persister_nap_merger_break"] = m["TotPersisterMergerNapBreak"]
m["total_compaction_written_bytes"] = m["TotFileMergeWrittenBytes"]
return m
}
func (s *Scorch) Analyze(d *document.Document) *index.AnalysisResult {
rv := &index.AnalysisResult{
Document: d,
Analyzed: make([]analysis.TokenFrequencies, len(d.Fields)+len(d.CompositeFields)),
Length: make([]int, len(d.Fields)+len(d.CompositeFields)),
}
for i, field := range d.Fields {
if field.Options().IsIndexed() {
fieldLength, tokenFreqs := field.Analyze()
rv.Analyzed[i] = tokenFreqs
rv.Length[i] = fieldLength
if len(d.CompositeFields) > 0 && field.Name() != "_id" {
// see if any of the composite fields need this
for _, compositeField := range d.CompositeFields {
compositeField.Compose(field.Name(), fieldLength, tokenFreqs)
}
}
}
}
return rv
}
func (s *Scorch) Advanced() (store.KVStore, error) {
return nil, nil
}
func (s *Scorch) AddEligibleForRemoval(epoch uint64) {
s.rootLock.Lock()
if s.root == nil || s.root.epoch != epoch {
s.eligibleForRemoval = append(s.eligibleForRemoval, epoch)
}
s.rootLock.Unlock()
}
func (s *Scorch) MemoryUsed() (memUsed uint64) {
indexSnapshot := s.currentSnapshot()
if indexSnapshot == nil {
return
}
defer func() {
_ = indexSnapshot.Close()
}()
// Account for current root snapshot overhead
memUsed += uint64(indexSnapshot.Size())
// Account for snapshot that the persister may be working on
persistEpoch := atomic.LoadUint64(&s.iStats.persistEpoch)
persistSnapshotSize := atomic.LoadUint64(&s.iStats.persistSnapshotSize)
if persistEpoch != 0 && indexSnapshot.epoch > persistEpoch {
// the snapshot that the persister is working on isn't the same as
// the current snapshot
memUsed += persistSnapshotSize
}
// Account for snapshot that the merger may be working on
mergeEpoch := atomic.LoadUint64(&s.iStats.mergeEpoch)
mergeSnapshotSize := atomic.LoadUint64(&s.iStats.mergeSnapshotSize)
if mergeEpoch != 0 && indexSnapshot.epoch > mergeEpoch {
// the snapshot that the merger is working on isn't the same as
// the current snapshot
memUsed += mergeSnapshotSize
}
memUsed += (atomic.LoadUint64(&s.iStats.newSegBufBytesAdded) -
atomic.LoadUint64(&s.iStats.newSegBufBytesRemoved))
memUsed += (atomic.LoadUint64(&s.iStats.analysisBytesAdded) -
atomic.LoadUint64(&s.iStats.analysisBytesRemoved))
return memUsed
}
func (s *Scorch) markIneligibleForRemoval(filename string) {
s.rootLock.Lock()
s.ineligibleForRemoval[filename] = true
s.rootLock.Unlock()
}
func (s *Scorch) unmarkIneligibleForRemoval(filename string) {
s.rootLock.Lock()
delete(s.ineligibleForRemoval, filename)
s.rootLock.Unlock()
}
func init() {
registry.RegisterIndexType(Name, NewScorch)
}
func parseToInteger(i interface{}) (int, error) {
switch v := i.(type) {
case float64:
return int(v), nil
case int:
return v, nil
default:
return 0, fmt.Errorf("expects int or float64 value")
}
}