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snapshot_index.go
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/
snapshot_index.go
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// Copyright (c) 2017 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 (
"container/heap"
"encoding/binary"
"fmt"
"reflect"
"sort"
"sync"
"sync/atomic"
"github.com/RoaringBitmap/roaring"
"github.com/blevesearch/bleve/document"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/index/scorch/segment"
"github.com/couchbase/vellum"
lev "github.com/couchbase/vellum/levenshtein"
)
// re usable, threadsafe levenshtein builders
var lb1, lb2 *lev.LevenshteinAutomatonBuilder
type asynchSegmentResult struct {
dict segment.TermDictionary
dictItr segment.DictionaryIterator
index int
docs *roaring.Bitmap
postings segment.PostingsList
err error
}
var reflectStaticSizeIndexSnapshot int
func init() {
var is interface{} = IndexSnapshot{}
reflectStaticSizeIndexSnapshot = int(reflect.TypeOf(is).Size())
var err error
lb1, err = lev.NewLevenshteinAutomatonBuilder(1, true)
if err != nil {
panic(fmt.Errorf("Levenshtein automaton ed1 builder err: %v", err))
}
lb2, err = lev.NewLevenshteinAutomatonBuilder(2, true)
if err != nil {
panic(fmt.Errorf("Levenshtein automaton ed2 builder err: %v", err))
}
}
type IndexSnapshot struct {
parent *Scorch
segment []*SegmentSnapshot
offsets []uint64
internal map[string][]byte
epoch uint64
size uint64
creator string
m sync.Mutex // Protects the fields that follow.
refs int64
m2 sync.Mutex // Protects the fields that follow.
fieldTFRs map[string][]*IndexSnapshotTermFieldReader // keyed by field, recycled TFR's
}
func (i *IndexSnapshot) Segments() []*SegmentSnapshot {
return i.segment
}
func (i *IndexSnapshot) Internal() map[string][]byte {
return i.internal
}
func (i *IndexSnapshot) AddRef() {
i.m.Lock()
i.refs++
i.m.Unlock()
}
func (i *IndexSnapshot) DecRef() (err error) {
i.m.Lock()
i.refs--
if i.refs == 0 {
for _, s := range i.segment {
if s != nil {
err2 := s.segment.DecRef()
if err == nil {
err = err2
}
}
}
if i.parent != nil {
go i.parent.AddEligibleForRemoval(i.epoch)
}
}
i.m.Unlock()
return err
}
func (i *IndexSnapshot) Close() error {
return i.DecRef()
}
func (i *IndexSnapshot) Size() int {
return int(i.size)
}
func (i *IndexSnapshot) updateSize() {
i.size += uint64(reflectStaticSizeIndexSnapshot)
for _, s := range i.segment {
i.size += uint64(s.Size())
}
}
func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string,
makeItr func(i segment.TermDictionary) segment.DictionaryIterator,
randomLookup bool) (*IndexSnapshotFieldDict, error) {
results := make(chan *asynchSegmentResult)
for index, segment := range i.segment {
go func(index int, segment *SegmentSnapshot) {
dict, err := segment.segment.Dictionary(field)
if err != nil {
results <- &asynchSegmentResult{err: err}
} else {
if randomLookup {
results <- &asynchSegmentResult{dict: dict}
} else {
results <- &asynchSegmentResult{dictItr: makeItr(dict)}
}
}
}(index, segment)
}
var err error
rv := &IndexSnapshotFieldDict{
snapshot: i,
cursors: make([]*segmentDictCursor, 0, len(i.segment)),
}
for count := 0; count < len(i.segment); count++ {
asr := <-results
if asr.err != nil && err == nil {
err = asr.err
} else {
if !randomLookup {
next, err2 := asr.dictItr.Next()
if err2 != nil && err == nil {
err = err2
}
if next != nil {
rv.cursors = append(rv.cursors, &segmentDictCursor{
itr: asr.dictItr,
curr: *next,
})
}
} else {
rv.cursors = append(rv.cursors, &segmentDictCursor{
dict: asr.dict,
})
}
}
}
// after ensuring we've read all items on channel
if err != nil {
return nil, err
}
if !randomLookup {
// prepare heap
heap.Init(rv)
}
return rv, nil
}
func (i *IndexSnapshot) FieldDict(field string) (index.FieldDict, error) {
return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
return i.Iterator()
}, false)
}
func (i *IndexSnapshot) FieldDictRange(field string, startTerm []byte,
endTerm []byte) (index.FieldDict, error) {
return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
return i.RangeIterator(string(startTerm), string(endTerm))
}, false)
}
func (i *IndexSnapshot) FieldDictPrefix(field string,
termPrefix []byte) (index.FieldDict, error) {
return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
return i.PrefixIterator(string(termPrefix))
}, false)
}
func (i *IndexSnapshot) FieldDictRegexp(field string,
termRegex string) (index.FieldDict, error) {
// TODO: potential optimization where the literal prefix represents the,
// entire regexp, allowing us to use PrefixIterator(prefixTerm)?
a, prefixBeg, prefixEnd, err := segment.ParseRegexp(termRegex)
if err != nil {
return nil, err
}
return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
return i.AutomatonIterator(a, prefixBeg, prefixEnd)
}, false)
}
func (i *IndexSnapshot) getLevAutomaton(term string,
fuzziness uint8) (vellum.Automaton, error) {
if fuzziness == 1 {
return lb1.BuildDfa(term, fuzziness)
} else if fuzziness == 2 {
return lb2.BuildDfa(term, fuzziness)
}
return nil, fmt.Errorf("fuzziness exceeds the max limit")
}
func (i *IndexSnapshot) FieldDictFuzzy(field string,
term string, fuzziness int, prefix string) (index.FieldDict, error) {
a, err := i.getLevAutomaton(term, uint8(fuzziness))
if err != nil {
return nil, err
}
var prefixBeg, prefixEnd []byte
if prefix != "" {
prefixBeg = []byte(prefix)
prefixEnd = segment.IncrementBytes(prefixBeg)
}
return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
return i.AutomatonIterator(a, prefixBeg, prefixEnd)
}, false)
}
func (i *IndexSnapshot) FieldDictOnly(field string,
onlyTerms [][]byte, includeCount bool) (index.FieldDict, error) {
return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
return i.OnlyIterator(onlyTerms, includeCount)
}, false)
}
func (i *IndexSnapshot) FieldDictContains(field string) (index.FieldDictContains, error) {
return i.newIndexSnapshotFieldDict(field, nil, true)
}
func (i *IndexSnapshot) DocIDReaderAll() (index.DocIDReader, error) {
results := make(chan *asynchSegmentResult)
for index, segment := range i.segment {
go func(index int, segment *SegmentSnapshot) {
results <- &asynchSegmentResult{
index: index,
docs: segment.DocNumbersLive(),
}
}(index, segment)
}
return i.newDocIDReader(results)
}
func (i *IndexSnapshot) DocIDReaderOnly(ids []string) (index.DocIDReader, error) {
results := make(chan *asynchSegmentResult)
for index, segment := range i.segment {
go func(index int, segment *SegmentSnapshot) {
docs, err := segment.DocNumbers(ids)
if err != nil {
results <- &asynchSegmentResult{err: err}
} else {
results <- &asynchSegmentResult{
index: index,
docs: docs,
}
}
}(index, segment)
}
return i.newDocIDReader(results)
}
func (i *IndexSnapshot) newDocIDReader(results chan *asynchSegmentResult) (index.DocIDReader, error) {
rv := &IndexSnapshotDocIDReader{
snapshot: i,
iterators: make([]roaring.IntIterable, len(i.segment)),
}
var err error
for count := 0; count < len(i.segment); count++ {
asr := <-results
if asr.err != nil && err != nil {
err = asr.err
} else {
rv.iterators[asr.index] = asr.docs.Iterator()
}
}
if err != nil {
return nil, err
}
return rv, nil
}
func (i *IndexSnapshot) Fields() ([]string, error) {
// FIXME not making this concurrent for now as it's not used in hot path
// of any searches at the moment (just a debug aid)
fieldsMap := map[string]struct{}{}
for _, segment := range i.segment {
fields := segment.Fields()
for _, field := range fields {
fieldsMap[field] = struct{}{}
}
}
rv := make([]string, 0, len(fieldsMap))
for k := range fieldsMap {
rv = append(rv, k)
}
return rv, nil
}
func (i *IndexSnapshot) GetInternal(key []byte) ([]byte, error) {
return i.internal[string(key)], nil
}
func (i *IndexSnapshot) DocCount() (uint64, error) {
var rv uint64
for _, segment := range i.segment {
rv += segment.Count()
}
return rv, nil
}
func (i *IndexSnapshot) Document(id string) (rv *document.Document, err error) {
// FIXME could be done more efficiently directly, but reusing for simplicity
tfr, err := i.TermFieldReader([]byte(id), "_id", false, false, false)
if err != nil {
return nil, err
}
defer func() {
if cerr := tfr.Close(); err == nil && cerr != nil {
err = cerr
}
}()
next, err := tfr.Next(nil)
if err != nil {
return nil, err
}
if next == nil {
// no such doc exists
return nil, nil
}
docNum, err := docInternalToNumber(next.ID)
if err != nil {
return nil, err
}
segmentIndex, localDocNum := i.segmentIndexAndLocalDocNumFromGlobal(docNum)
rv = document.NewDocument(id)
err = i.segment[segmentIndex].VisitDocument(localDocNum, func(name string, typ byte, val []byte, pos []uint64) bool {
if name == "_id" {
return true
}
// copy value, array positions to preserve them beyond the scope of this callback
value := append([]byte(nil), val...)
arrayPos := append([]uint64(nil), pos...)
switch typ {
case 't':
rv.AddField(document.NewTextField(name, arrayPos, value))
case 'n':
rv.AddField(document.NewNumericFieldFromBytes(name, arrayPos, value))
case 'd':
rv.AddField(document.NewDateTimeFieldFromBytes(name, arrayPos, value))
case 'b':
rv.AddField(document.NewBooleanFieldFromBytes(name, arrayPos, value))
case 'g':
rv.AddField(document.NewGeoPointFieldFromBytes(name, arrayPos, value))
}
return true
})
if err != nil {
return nil, err
}
return rv, nil
}
func (i *IndexSnapshot) segmentIndexAndLocalDocNumFromGlobal(docNum uint64) (int, uint64) {
segmentIndex := sort.Search(len(i.offsets),
func(x int) bool {
return i.offsets[x] > docNum
}) - 1
localDocNum := docNum - i.offsets[segmentIndex]
return int(segmentIndex), localDocNum
}
func (i *IndexSnapshot) ExternalID(id index.IndexInternalID) (string, error) {
docNum, err := docInternalToNumber(id)
if err != nil {
return "", err
}
segmentIndex, localDocNum := i.segmentIndexAndLocalDocNumFromGlobal(docNum)
v, err := i.segment[segmentIndex].DocID(localDocNum)
if err != nil {
return "", err
}
if v == nil {
return "", fmt.Errorf("document number %d not found", docNum)
}
return string(v), nil
}
func (i *IndexSnapshot) InternalID(id string) (rv index.IndexInternalID, err error) {
// FIXME could be done more efficiently directly, but reusing for simplicity
tfr, err := i.TermFieldReader([]byte(id), "_id", false, false, false)
if err != nil {
return nil, err
}
defer func() {
if cerr := tfr.Close(); err == nil && cerr != nil {
err = cerr
}
}()
next, err := tfr.Next(nil)
if err != nil || next == nil {
return nil, err
}
return next.ID, nil
}
func (i *IndexSnapshot) TermFieldReader(term []byte, field string, includeFreq,
includeNorm, includeTermVectors bool) (index.TermFieldReader, error) {
rv := i.allocTermFieldReaderDicts(field)
rv.term = term
rv.field = field
rv.snapshot = i
if rv.postings == nil {
rv.postings = make([]segment.PostingsList, len(i.segment))
}
if rv.iterators == nil {
rv.iterators = make([]segment.PostingsIterator, len(i.segment))
}
rv.segmentOffset = 0
rv.includeFreq = includeFreq
rv.includeNorm = includeNorm
rv.includeTermVectors = includeTermVectors
rv.currPosting = nil
rv.currID = rv.currID[:0]
if rv.dicts == nil {
rv.dicts = make([]segment.TermDictionary, len(i.segment))
for i, segment := range i.segment {
dict, err := segment.segment.Dictionary(field)
if err != nil {
return nil, err
}
rv.dicts[i] = dict
}
}
for i, segment := range i.segment {
pl, err := rv.dicts[i].PostingsList(term, segment.deleted, rv.postings[i])
if err != nil {
return nil, err
}
rv.postings[i] = pl
rv.iterators[i] = pl.Iterator(includeFreq, includeNorm, includeTermVectors, rv.iterators[i])
}
atomic.AddUint64(&i.parent.stats.TotTermSearchersStarted, uint64(1))
return rv, nil
}
func (i *IndexSnapshot) allocTermFieldReaderDicts(field string) (tfr *IndexSnapshotTermFieldReader) {
i.m2.Lock()
if i.fieldTFRs != nil {
tfrs := i.fieldTFRs[field]
last := len(tfrs) - 1
if last >= 0 {
tfr = tfrs[last]
tfrs[last] = nil
i.fieldTFRs[field] = tfrs[:last]
i.m2.Unlock()
return
}
}
i.m2.Unlock()
return &IndexSnapshotTermFieldReader{}
}
func (i *IndexSnapshot) recycleTermFieldReader(tfr *IndexSnapshotTermFieldReader) {
i.parent.rootLock.RLock()
obsolete := i.parent.root != i
i.parent.rootLock.RUnlock()
if obsolete {
// if we're not the current root (mutations happened), don't bother recycling
return
}
i.m2.Lock()
if i.fieldTFRs == nil {
i.fieldTFRs = map[string][]*IndexSnapshotTermFieldReader{}
}
i.fieldTFRs[tfr.field] = append(i.fieldTFRs[tfr.field], tfr)
i.m2.Unlock()
}
func docNumberToBytes(buf []byte, in uint64) []byte {
if len(buf) != 8 {
if cap(buf) >= 8 {
buf = buf[0:8]
} else {
buf = make([]byte, 8)
}
}
binary.BigEndian.PutUint64(buf, in)
return buf
}
func docInternalToNumber(in index.IndexInternalID) (uint64, error) {
if len(in) != 8 {
return 0, fmt.Errorf("wrong len for IndexInternalID: %q", in)
}
return binary.BigEndian.Uint64(in), nil
}
func (i *IndexSnapshot) DocumentVisitFieldTerms(id index.IndexInternalID,
fields []string, visitor index.DocumentFieldTermVisitor) error {
_, err := i.documentVisitFieldTerms(id, fields, visitor, nil)
return err
}
func (i *IndexSnapshot) documentVisitFieldTerms(id index.IndexInternalID,
fields []string, visitor index.DocumentFieldTermVisitor,
dvs segment.DocVisitState) (segment.DocVisitState, error) {
docNum, err := docInternalToNumber(id)
if err != nil {
return nil, err
}
segmentIndex, localDocNum := i.segmentIndexAndLocalDocNumFromGlobal(docNum)
if segmentIndex >= len(i.segment) {
return nil, nil
}
_, dvs, err = i.documentVisitFieldTermsOnSegment(
segmentIndex, localDocNum, fields, nil, visitor, dvs)
return dvs, err
}
func (i *IndexSnapshot) documentVisitFieldTermsOnSegment(
segmentIndex int, localDocNum uint64, fields []string, cFields []string,
visitor index.DocumentFieldTermVisitor, dvs segment.DocVisitState) (
cFieldsOut []string, dvsOut segment.DocVisitState, err error) {
ss := i.segment[segmentIndex]
var vFields []string // fields that are visitable via the segment
ssv, ssvOk := ss.segment.(segment.DocumentFieldTermVisitable)
if ssvOk && ssv != nil {
vFields, err = ssv.VisitableDocValueFields()
if err != nil {
return nil, nil, err
}
}
var errCh chan error
// cFields represents the fields that we'll need from the
// cachedDocs, and might be optionally be provided by the caller,
// if the caller happens to know we're on the same segmentIndex
// from a previous invocation
if cFields == nil {
cFields = subtractStrings(fields, vFields)
if !ss.cachedDocs.hasFields(cFields) {
errCh = make(chan error, 1)
go func() {
err := ss.cachedDocs.prepareFields(cFields, ss)
if err != nil {
errCh <- err
}
close(errCh)
}()
}
}
if ssvOk && ssv != nil && len(vFields) > 0 {
dvs, err = ssv.VisitDocumentFieldTerms(localDocNum, fields, visitor, dvs)
if err != nil {
return nil, nil, err
}
}
if errCh != nil {
err = <-errCh
if err != nil {
return nil, nil, err
}
}
if len(cFields) > 0 {
ss.cachedDocs.visitDoc(localDocNum, cFields, visitor)
}
return cFields, dvs, nil
}
func (i *IndexSnapshot) DocValueReader(fields []string) (
index.DocValueReader, error) {
return &DocValueReader{i: i, fields: fields, currSegmentIndex: -1}, nil
}
type DocValueReader struct {
i *IndexSnapshot
fields []string
dvs segment.DocVisitState
currSegmentIndex int
currCachedFields []string
}
func (dvr *DocValueReader) VisitDocValues(id index.IndexInternalID,
visitor index.DocumentFieldTermVisitor) (err error) {
docNum, err := docInternalToNumber(id)
if err != nil {
return err
}
segmentIndex, localDocNum := dvr.i.segmentIndexAndLocalDocNumFromGlobal(docNum)
if segmentIndex >= len(dvr.i.segment) {
return nil
}
if dvr.currSegmentIndex != segmentIndex {
dvr.currSegmentIndex = segmentIndex
dvr.currCachedFields = nil
}
dvr.currCachedFields, dvr.dvs, err = dvr.i.documentVisitFieldTermsOnSegment(
dvr.currSegmentIndex, localDocNum, dvr.fields, dvr.currCachedFields, visitor, dvr.dvs)
return err
}
func (i *IndexSnapshot) DumpAll() chan interface{} {
rv := make(chan interface{})
go func() {
close(rv)
}()
return rv
}
func (i *IndexSnapshot) DumpDoc(id string) chan interface{} {
rv := make(chan interface{})
go func() {
close(rv)
}()
return rv
}
func (i *IndexSnapshot) DumpFields() chan interface{} {
rv := make(chan interface{})
go func() {
close(rv)
}()
return rv
}
// subtractStrings returns set a minus elements of set b.
func subtractStrings(a, b []string) []string {
if len(b) == 0 {
return a
}
rv := make([]string, 0, len(a))
OUTER:
for _, as := range a {
for _, bs := range b {
if as == bs {
continue OUTER
}
}
rv = append(rv, as)
}
return rv
}