forked from blevesearch/bleve
/
scorch.go
452 lines (387 loc) · 10.6 KB
/
scorch.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
// 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"
"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/mem"
"github.com/blevesearch/bleve/index/scorch/segment/zap"
"github.com/blevesearch/bleve/index/store"
"github.com/blevesearch/bleve/registry"
"github.com/boltdb/bolt"
)
const Name = "scorch"
const Version uint8 = 1
type Scorch struct {
readOnly bool
version uint8
config map[string]interface{}
analysisQueue *index.AnalysisQueue
stats *Stats
nextSegmentID uint64
path string
unsafeBatch bool
rootLock sync.RWMutex
root *IndexSnapshot // holds 1 ref-count on the root
rootPersisted []chan error // closed when root is persisted
nextSnapshotEpoch uint64
eligibleForRemoval []uint64 // Index snapshot epochs that are safe to GC.
ineligibleForRemoval map[string]bool // Filenames that should not be GC'ed yet.
closeCh chan struct{}
introductions chan *segmentIntroduction
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)
}
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.stats = &Stats{i: rv}
rv.root = &IndexSnapshot{parent: rv, refs: 1}
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) fireEvent(kind EventKind, dur time.Duration) {
if s.onEvent != nil {
s.onEvent(Event{Kind: kind, Scorch: s, Duration: dur})
}
}
func (s *Scorch) fireAsyncError(err error) {
if s.onAsyncError != nil {
s.onAsyncError(err)
}
}
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
}
}
s.introductions = make(chan *segmentIntroduction)
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
}
}
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 {
_ = s.root.DecRef()
}
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?
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
for itemsDeQueued < numUpdates {
result := <-resultChan
analysisResults[itemsDeQueued] = result
itemsDeQueued++
}
close(resultChan)
atomic.AddUint64(&s.stats.analysisTime, uint64(time.Since(start)))
// notify handlers that we're about to introduce a segment
s.fireEvent(EventKindBatchIntroductionStart, 0)
var newSegment segment.Segment
if len(analysisResults) > 0 {
newSegment, err = zap.NewSegmentBase(mem.NewFromAnalyzedDocs(analysisResults), DefaultChunkFactor)
if err != nil {
return err
}
}
err = s.prepareSegment(newSegment, ids, batch.InternalOps)
if err != nil {
if newSegment != nil {
_ = newSegment.Close()
}
atomic.AddUint64(&s.stats.errors, 1)
} else {
atomic.AddUint64(&s.stats.updates, numUpdates)
atomic.AddUint64(&s.stats.deletes, numDeletes)
atomic.AddUint64(&s.stats.batches, 1)
atomic.AddUint64(&s.stats.numPlainTextBytesIndexed, numPlainTextBytes)
}
return err
}
func (s *Scorch) prepareSegment(newSegment segment.Segment, ids []string,
internalOps map[string][]byte) 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),
}
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()
for _, seg := range root.segment {
delta, err := seg.segment.DocNumbers(ids)
if err != nil {
return err
}
introduction.obsoletes[seg.id] = delta
}
_ = root.DecRef()
s.introductions <- introduction
// block until this segment is applied
err := <-introduction.applied
if err != nil {
return err
}
if introduction.persisted != nil {
err = <-introduction.persisted
}
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) {
s.rootLock.RLock()
rv := &Reader{root: s.root}
rv.root.AddRef()
s.rootLock.RUnlock()
return rv, nil
}
func (s *Scorch) Stats() json.Marshaler {
return s.stats
}
func (s *Scorch) StatsMap() map[string]interface{} {
m, _ := s.stats.statsMap()
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 {
// 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() uint64 {
var memUsed uint64
s.rootLock.RLock()
if s.root != nil {
for _, segmentSnapshot := range s.root.segment {
memUsed += 8 /* size of id -> uint64 */ +
segmentSnapshot.segment.SizeInBytes()
if segmentSnapshot.deleted != nil {
memUsed += segmentSnapshot.deleted.GetSizeInBytes()
}
memUsed += segmentSnapshot.cachedDocs.sizeInBytes()
}
}
s.rootLock.RUnlock()
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)
}