/
upside_down.go
712 lines (621 loc) · 17.9 KB
/
upside_down.go
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// Copyright (c) 2014 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 upside_down
import (
"bytes"
"encoding/json"
"fmt"
"math"
"sync/atomic"
"time"
"github.com/blevesearch/bleve/analysis"
"github.com/blevesearch/bleve/document"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/index/store"
"github.com/golang/protobuf/proto"
)
var VersionKey = []byte{'v'}
const Version uint8 = 4
var IncompatibleVersion = fmt.Errorf("incompatible version, %d is supported", Version)
type UpsideDownCouch struct {
version uint8
path string
store store.KVStore
fieldIndexCache *FieldIndexCache
docCount uint64
analysisQueue AnalysisQueue
stats *indexStat
}
func NewUpsideDownCouch(s store.KVStore, analysisQueue AnalysisQueue) *UpsideDownCouch {
return &UpsideDownCouch{
version: Version,
fieldIndexCache: NewFieldIndexCache(),
store: s,
analysisQueue: analysisQueue,
stats: &indexStat{},
}
}
func (udc *UpsideDownCouch) init(kvwriter store.KVWriter) (err error) {
// prepare a list of rows
rows := make([]UpsideDownCouchRow, 0)
// version marker
rows = append(rows, NewVersionRow(udc.version))
return udc.batchRows(kvwriter, nil, rows, nil)
}
func (udc *UpsideDownCouch) loadSchema(kvreader store.KVReader) (err error) {
keyPrefix := []byte{'f'}
it := kvreader.Iterator(keyPrefix)
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
it.Seek(keyPrefix)
key, val, valid := it.Current()
for valid {
// stop when
if !bytes.HasPrefix(key, keyPrefix) {
break
}
var fieldRow *FieldRow
fieldRow, err = NewFieldRowKV(key, val)
if err != nil {
return
}
udc.fieldIndexCache.AddExisting(fieldRow.name, fieldRow.index)
it.Next()
key, val, valid = it.Current()
}
keyPrefix = []byte{'v'}
val, err = kvreader.Get(keyPrefix)
if err != nil {
return
}
var vr *VersionRow
vr, err = NewVersionRowKV(keyPrefix, val)
if err != nil {
return
}
if vr.version != Version {
err = IncompatibleVersion
return
}
return
}
func (udc *UpsideDownCouch) batchRows(writer store.KVWriter, addRows []UpsideDownCouchRow, updateRows []UpsideDownCouchRow, deleteRows []UpsideDownCouchRow) (err error) {
// prepare batch
wb := writer.NewBatch()
// add
for _, row := range addRows {
tfr, ok := row.(*TermFrequencyRow)
if ok {
// need to increment counter
dictionaryKey := tfr.DictionaryRowKey()
wb.Merge(dictionaryKey, newDictionaryTermIncr())
}
wb.Set(row.Key(), row.Value())
}
// update
for _, row := range updateRows {
wb.Set(row.Key(), row.Value())
}
// delete
for _, row := range deleteRows {
tfr, ok := row.(*TermFrequencyRow)
if ok {
// need to decrement counter
dictionaryKey := tfr.DictionaryRowKey()
wb.Merge(dictionaryKey, newDictionaryTermDecr())
}
wb.Delete(row.Key())
}
// write out the batch
err = wb.Execute()
if err != nil {
return
}
return
}
func (udc *UpsideDownCouch) DocCount() (uint64, error) {
return udc.docCount, nil
}
func (udc *UpsideDownCouch) Open() (err error) {
// start a writer for the open process
var kvwriter store.KVWriter
kvwriter, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := kvwriter.Close(); err == nil && cerr != nil {
err = cerr
}
}()
var value []byte
value, err = kvwriter.Get(VersionKey)
if err != nil {
return
}
// init new index OR load schema
if value == nil {
err = udc.init(kvwriter)
if err != nil {
return
}
} else {
err = udc.loadSchema(kvwriter)
if err != nil {
return
}
}
// set doc count
udc.docCount, err = udc.countDocs(kvwriter)
return
}
func (udc *UpsideDownCouch) countDocs(kvreader store.KVReader) (count uint64, err error) {
it := kvreader.Iterator([]byte{'b'})
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
key, _, valid := it.Current()
for valid {
if !bytes.HasPrefix(key, []byte{'b'}) {
break
}
count++
it.Next()
key, _, valid = it.Current()
}
return
}
func (udc *UpsideDownCouch) rowCount() (count uint64, err error) {
// start an isolated reader for use during the rowcount
kvreader, err := udc.store.Reader()
if err != nil {
return
}
defer func() {
if cerr := kvreader.Close(); err == nil && cerr != nil {
err = cerr
}
}()
it := kvreader.Iterator([]byte{0})
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
_, _, valid := it.Current()
for valid {
count++
it.Next()
_, _, valid = it.Current()
}
return
}
func (udc *UpsideDownCouch) Close() error {
return udc.store.Close()
}
func (udc *UpsideDownCouch) Update(doc *document.Document) (err error) {
// do analysis before acquiring write lock
analysisStart := time.Now()
resultChan := make(chan *AnalysisResult)
aw := AnalysisWork{
udc: udc,
d: doc,
rc: resultChan,
}
// put the work on the queue
go func() {
udc.analysisQueue <- aw
}()
// wait for the result
result := <-resultChan
close(resultChan)
atomic.AddUint64(&udc.stats.analysisTime, uint64(time.Since(analysisStart)))
// start a writer for this update
indexStart := time.Now()
var kvwriter store.KVWriter
kvwriter, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := kvwriter.Close(); err == nil && cerr != nil {
err = cerr
}
}()
// first we lookup the backindex row for the doc id if it exists
// lookup the back index row
var backIndexRow *BackIndexRow
backIndexRow, err = udc.backIndexRowForDoc(kvwriter, doc.ID)
if err != nil {
atomic.AddUint64(&udc.stats.errors, 1)
return
}
// prepare a list of rows
addRows := make([]UpsideDownCouchRow, 0)
updateRows := make([]UpsideDownCouchRow, 0)
deleteRows := make([]UpsideDownCouchRow, 0)
addRows, updateRows, deleteRows = udc.mergeOldAndNew(backIndexRow, result.rows, addRows, updateRows, deleteRows)
err = udc.batchRows(kvwriter, addRows, updateRows, deleteRows)
if err == nil && backIndexRow == nil {
udc.docCount++
}
atomic.AddUint64(&udc.stats.indexTime, uint64(time.Since(indexStart)))
if err == nil {
atomic.AddUint64(&udc.stats.updates, 1)
} else {
atomic.AddUint64(&udc.stats.errors, 1)
}
return
}
func (udc *UpsideDownCouch) mergeOldAndNew(backIndexRow *BackIndexRow, rows, addRows, updateRows, deleteRows []UpsideDownCouchRow) ([]UpsideDownCouchRow, []UpsideDownCouchRow, []UpsideDownCouchRow) {
existingTermKeys := make(map[string]bool)
for _, key := range backIndexRow.AllTermKeys() {
existingTermKeys[string(key)] = true
}
existingStoredKeys := make(map[string]bool)
for _, key := range backIndexRow.AllStoredKeys() {
existingStoredKeys[string(key)] = true
}
for _, row := range rows {
switch row := row.(type) {
case *TermFrequencyRow:
rowKey := string(row.Key())
if _, ok := existingTermKeys[rowKey]; ok {
updateRows = append(updateRows, row)
delete(existingTermKeys, rowKey)
} else {
addRows = append(addRows, row)
}
case *StoredRow:
rowKey := string(row.Key())
if _, ok := existingStoredKeys[rowKey]; ok {
updateRows = append(updateRows, row)
delete(existingStoredKeys, rowKey)
} else {
addRows = append(addRows, row)
}
default:
updateRows = append(updateRows, row)
}
}
// any of the existing rows that weren't updated need to be deleted
for existingTermKey := range existingTermKeys {
termFreqRow, err := NewTermFrequencyRowK([]byte(existingTermKey))
if err == nil {
deleteRows = append(deleteRows, termFreqRow)
}
}
// any of the existing stored fields that weren't updated need to be deleted
for existingStoredKey := range existingStoredKeys {
storedRow, err := NewStoredRowK([]byte(existingStoredKey))
if err == nil {
deleteRows = append(deleteRows, storedRow)
}
}
return addRows, updateRows, deleteRows
}
func (udc *UpsideDownCouch) storeField(docID string, field document.Field, fieldIndex uint16) ([]UpsideDownCouchRow, []*BackIndexStoreEntry) {
rows := make([]UpsideDownCouchRow, 0, 100)
backIndexStoredEntries := make([]*BackIndexStoreEntry, 0)
fieldType := encodeFieldType(field)
storedRow := NewStoredRow(docID, fieldIndex, field.ArrayPositions(), fieldType, field.Value())
// record the back index entry
backIndexStoredEntry := BackIndexStoreEntry{Field: proto.Uint32(uint32(fieldIndex)), ArrayPositions: field.ArrayPositions()}
backIndexStoredEntries = append(backIndexStoredEntries, &backIndexStoredEntry)
rows = append(rows, storedRow)
return rows, backIndexStoredEntries
}
func encodeFieldType(f document.Field) byte {
fieldType := byte('x')
switch f.(type) {
case *document.TextField:
fieldType = 't'
case *document.NumericField:
fieldType = 'n'
case *document.DateTimeField:
fieldType = 'd'
case *document.CompositeField:
fieldType = 'c'
}
return fieldType
}
func (udc *UpsideDownCouch) indexField(docID string, field document.Field, fieldIndex uint16, fieldLength int, tokenFreqs analysis.TokenFrequencies) ([]UpsideDownCouchRow, []*BackIndexTermEntry) {
rows := make([]UpsideDownCouchRow, 0, 100)
backIndexTermEntries := make([]*BackIndexTermEntry, 0)
fieldNorm := float32(1.0 / math.Sqrt(float64(fieldLength)))
for _, tf := range tokenFreqs {
var termFreqRow *TermFrequencyRow
if field.Options().IncludeTermVectors() {
tv, newFieldRows := udc.termVectorsFromTokenFreq(fieldIndex, tf)
rows = append(rows, newFieldRows...)
termFreqRow = NewTermFrequencyRowWithTermVectors(tf.Term, fieldIndex, docID, uint64(frequencyFromTokenFreq(tf)), fieldNorm, tv)
} else {
termFreqRow = NewTermFrequencyRow(tf.Term, fieldIndex, docID, uint64(frequencyFromTokenFreq(tf)), fieldNorm)
}
// record the back index entry
backIndexTermEntry := BackIndexTermEntry{Term: proto.String(string(tf.Term)), Field: proto.Uint32(uint32(fieldIndex))}
backIndexTermEntries = append(backIndexTermEntries, &backIndexTermEntry)
rows = append(rows, termFreqRow)
}
return rows, backIndexTermEntries
}
func (udc *UpsideDownCouch) Delete(id string) (err error) {
indexStart := time.Now()
// start a writer for this delete
var kvwriter store.KVWriter
kvwriter, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := kvwriter.Close(); err == nil && cerr != nil {
err = cerr
}
}()
// lookup the back index row
var backIndexRow *BackIndexRow
backIndexRow, err = udc.backIndexRowForDoc(kvwriter, id)
if err != nil {
atomic.AddUint64(&udc.stats.errors, 1)
return
}
if backIndexRow == nil {
atomic.AddUint64(&udc.stats.deletes, 1)
return
}
deleteRows := make([]UpsideDownCouchRow, 0)
deleteRows = udc.deleteSingle(id, backIndexRow, deleteRows)
err = udc.batchRows(kvwriter, nil, nil, deleteRows)
if err == nil {
udc.docCount--
}
atomic.AddUint64(&udc.stats.indexTime, uint64(time.Since(indexStart)))
if err == nil {
atomic.AddUint64(&udc.stats.deletes, 1)
} else {
atomic.AddUint64(&udc.stats.errors, 1)
}
return
}
func (udc *UpsideDownCouch) deleteSingle(id string, backIndexRow *BackIndexRow, deleteRows []UpsideDownCouchRow) []UpsideDownCouchRow {
for _, backIndexEntry := range backIndexRow.termEntries {
tfr := NewTermFrequencyRow([]byte(*backIndexEntry.Term), uint16(*backIndexEntry.Field), id, 0, 0)
deleteRows = append(deleteRows, tfr)
}
for _, se := range backIndexRow.storedEntries {
sf := NewStoredRow(id, uint16(*se.Field), se.ArrayPositions, 'x', nil)
deleteRows = append(deleteRows, sf)
}
// also delete the back entry itself
deleteRows = append(deleteRows, backIndexRow)
return deleteRows
}
func (udc *UpsideDownCouch) backIndexRowForDoc(kvreader store.KVReader, docID string) (*BackIndexRow, error) {
// use a temporary row structure to build key
tempRow := &BackIndexRow{
doc: []byte(docID),
}
key := tempRow.Key()
value, err := kvreader.Get(key)
if err != nil {
return nil, err
}
if value == nil {
return nil, nil
}
backIndexRow, err := NewBackIndexRowKV(key, value)
if err != nil {
return nil, err
}
return backIndexRow, nil
}
func (udc *UpsideDownCouch) backIndexRowsForBatch(kvreader store.KVReader, batch *index.Batch) (map[string]*BackIndexRow, error) {
// FIXME faster to order the ids and scan sequentially
// for now just get it working
rv := make(map[string]*BackIndexRow, 0)
for docID := range batch.IndexOps {
backIndexRow, err := udc.backIndexRowForDoc(kvreader, docID)
if err != nil {
return nil, err
}
rv[docID] = backIndexRow
}
return rv, nil
}
func decodeFieldType(typ byte, name string, value []byte) document.Field {
switch typ {
case 't':
return document.NewTextField(name, []uint64{}, value)
case 'n':
return document.NewNumericFieldFromBytes(name, []uint64{}, value)
case 'd':
return document.NewDateTimeFieldFromBytes(name, []uint64{}, value)
}
return nil
}
func frequencyFromTokenFreq(tf *analysis.TokenFreq) int {
return len(tf.Locations)
}
func (udc *UpsideDownCouch) termVectorsFromTokenFreq(field uint16, tf *analysis.TokenFreq) ([]*TermVector, []UpsideDownCouchRow) {
rv := make([]*TermVector, len(tf.Locations))
newFieldRows := make([]UpsideDownCouchRow, 0)
for i, l := range tf.Locations {
var newFieldRow *FieldRow
fieldIndex := field
if l.Field != "" {
// lookup correct field
fieldIndex, newFieldRow = udc.fieldIndexCache.FieldIndex(l.Field)
if newFieldRow != nil {
newFieldRows = append(newFieldRows, newFieldRow)
}
}
tv := TermVector{
field: fieldIndex,
pos: uint64(l.Position),
start: uint64(l.Start),
end: uint64(l.End),
}
rv[i] = &tv
}
return rv, newFieldRows
}
func (udc *UpsideDownCouch) termFieldVectorsFromTermVectors(in []*TermVector) []*index.TermFieldVector {
rv := make([]*index.TermFieldVector, len(in))
for i, tv := range in {
fieldName := udc.fieldIndexCache.FieldName(tv.field)
tfv := index.TermFieldVector{
Field: fieldName,
Pos: tv.pos,
Start: tv.start,
End: tv.end,
}
rv[i] = &tfv
}
return rv
}
func (udc *UpsideDownCouch) Batch(batch *index.Batch) (err error) {
analysisStart := time.Now()
resultChan := make(chan *AnalysisResult)
var numUpdates uint64
for _, doc := range batch.IndexOps {
if doc != nil {
numUpdates++
}
}
go func() {
for _, doc := range batch.IndexOps {
if doc != nil {
aw := AnalysisWork{
udc: udc,
d: doc,
rc: resultChan,
}
// put the work on the queue
udc.analysisQueue <- aw
}
}
}()
newRowsMap := make(map[string][]UpsideDownCouchRow)
// wait for the result
var itemsDeQueued uint64
for itemsDeQueued < numUpdates {
result := <-resultChan
newRowsMap[result.docID] = result.rows
itemsDeQueued++
}
close(resultChan)
atomic.AddUint64(&udc.stats.analysisTime, uint64(time.Since(analysisStart)))
indexStart := time.Now()
// start a writer for this batch
var kvwriter store.KVWriter
kvwriter, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := kvwriter.Close(); err == nil && cerr != nil {
err = cerr
}
}()
// first lookup all the back index rows
var backIndexRows map[string]*BackIndexRow
backIndexRows, err = udc.backIndexRowsForBatch(kvwriter, batch)
if err != nil {
return
}
// prepare a list of rows
addRows := make([]UpsideDownCouchRow, 0)
updateRows := make([]UpsideDownCouchRow, 0)
deleteRows := make([]UpsideDownCouchRow, 0)
docsAdded := uint64(0)
docsDeleted := uint64(0)
for docID, doc := range batch.IndexOps {
backIndexRow := backIndexRows[docID]
if doc == nil && backIndexRow != nil {
// delete
deleteRows = udc.deleteSingle(docID, backIndexRow, deleteRows)
docsDeleted++
} else if doc != nil {
addRows, updateRows, deleteRows = udc.mergeOldAndNew(backIndexRow, newRowsMap[docID], addRows, updateRows, deleteRows)
if backIndexRow == nil {
docsAdded++
}
}
}
// add the internal ops
for internalKey, internalValue := range batch.InternalOps {
if internalValue == nil {
// delete
deleteInternalRow := NewInternalRow([]byte(internalKey), nil)
deleteRows = append(deleteRows, deleteInternalRow)
} else {
updateInternalRow := NewInternalRow([]byte(internalKey), internalValue)
updateRows = append(updateRows, updateInternalRow)
}
}
err = udc.batchRows(kvwriter, addRows, updateRows, deleteRows)
atomic.AddUint64(&udc.stats.indexTime, uint64(time.Since(indexStart)))
if err == nil {
udc.docCount += docsAdded
udc.docCount -= docsDeleted
atomic.AddUint64(&udc.stats.updates, numUpdates)
atomic.AddUint64(&udc.stats.deletes, docsDeleted)
atomic.AddUint64(&udc.stats.batches, 1)
} else {
atomic.AddUint64(&udc.stats.errors, 1)
}
return
}
func (udc *UpsideDownCouch) SetInternal(key, val []byte) (err error) {
internalRow := NewInternalRow(key, val)
var writer store.KVWriter
writer, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := writer.Close(); err == nil && cerr != nil {
err = cerr
}
}()
return writer.Set(internalRow.Key(), internalRow.Value())
}
func (udc *UpsideDownCouch) DeleteInternal(key []byte) (err error) {
internalRow := NewInternalRow(key, nil)
var writer store.KVWriter
writer, err = udc.store.Writer()
if err != nil {
return
}
defer func() {
if cerr := writer.Close(); err == nil && cerr != nil {
err = cerr
}
}()
return writer.Delete(internalRow.Key())
}
func (udc *UpsideDownCouch) Reader() (index.IndexReader, error) {
kvr, err := udc.store.Reader()
if err != nil {
return nil, fmt.Errorf("error opening store reader: %v", err)
}
return &IndexReader{
index: udc,
kvreader: kvr,
docCount: udc.docCount,
}, nil
}
func (udc *UpsideDownCouch) Stats() json.Marshaler {
return udc.stats
}