* Update dep github.com/markbates/goth * Update dep github.com/blevesearch/bleve * Update dep golang.org/x/oauth2 * Fix github.com/blevesearch/bleve to c74e08f039e56cef576e4336382b2a2d12d9e026 * Update dep golang.org/x/oauth2
646 lines
17 KiB
Go
646 lines
17 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package zap
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import (
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"bufio"
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"bytes"
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"encoding/binary"
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"fmt"
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"math"
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"os"
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"sort"
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"github.com/RoaringBitmap/roaring"
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"github.com/Smerity/govarint"
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"github.com/couchbase/vellum"
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"github.com/golang/snappy"
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)
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const docDropped = math.MaxUint64 // sentinel docNum to represent a deleted doc
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// Merge takes a slice of zap segments and bit masks describing which
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// documents may be dropped, and creates a new segment containing the
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// remaining data. This new segment is built at the specified path,
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// with the provided chunkFactor.
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func Merge(segments []*Segment, drops []*roaring.Bitmap, path string,
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chunkFactor uint32) ([][]uint64, error) {
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flag := os.O_RDWR | os.O_CREATE
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f, err := os.OpenFile(path, flag, 0600)
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if err != nil {
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return nil, err
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}
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cleanup := func() {
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_ = f.Close()
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_ = os.Remove(path)
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}
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segmentBases := make([]*SegmentBase, len(segments))
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for segmenti, segment := range segments {
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segmentBases[segmenti] = &segment.SegmentBase
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}
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// buffer the output
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br := bufio.NewWriter(f)
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// wrap it for counting (tracking offsets)
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cr := NewCountHashWriter(br)
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newDocNums, numDocs, storedIndexOffset, fieldsIndexOffset, docValueOffset, _, _, _, err :=
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MergeToWriter(segmentBases, drops, chunkFactor, cr)
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if err != nil {
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cleanup()
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return nil, err
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}
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err = persistFooter(numDocs, storedIndexOffset, fieldsIndexOffset,
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docValueOffset, chunkFactor, cr.Sum32(), cr)
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if err != nil {
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cleanup()
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return nil, err
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}
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err = br.Flush()
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if err != nil {
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cleanup()
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return nil, err
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}
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err = f.Sync()
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if err != nil {
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cleanup()
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return nil, err
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}
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err = f.Close()
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if err != nil {
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cleanup()
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return nil, err
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}
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return newDocNums, nil
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}
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func MergeToWriter(segments []*SegmentBase, drops []*roaring.Bitmap,
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chunkFactor uint32, cr *CountHashWriter) (
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newDocNums [][]uint64,
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numDocs, storedIndexOffset, fieldsIndexOffset, docValueOffset uint64,
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dictLocs []uint64, fieldsInv []string, fieldsMap map[string]uint16,
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err error) {
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docValueOffset = uint64(fieldNotUninverted)
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var fieldsSame bool
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fieldsSame, fieldsInv = mergeFields(segments)
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fieldsMap = mapFields(fieldsInv)
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numDocs = computeNewDocCount(segments, drops)
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if numDocs > 0 {
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storedIndexOffset, newDocNums, err = mergeStoredAndRemap(segments, drops,
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fieldsMap, fieldsInv, fieldsSame, numDocs, cr)
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if err != nil {
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return nil, 0, 0, 0, 0, nil, nil, nil, err
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}
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dictLocs, docValueOffset, err = persistMergedRest(segments, drops, fieldsInv, fieldsMap,
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newDocNums, numDocs, chunkFactor, cr)
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if err != nil {
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return nil, 0, 0, 0, 0, nil, nil, nil, err
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}
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} else {
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dictLocs = make([]uint64, len(fieldsInv))
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}
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fieldsIndexOffset, err = persistFields(fieldsInv, cr, dictLocs)
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if err != nil {
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return nil, 0, 0, 0, 0, nil, nil, nil, err
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}
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return newDocNums, numDocs, storedIndexOffset, fieldsIndexOffset, docValueOffset, dictLocs, fieldsInv, fieldsMap, nil
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}
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// mapFields takes the fieldsInv list and returns a map of fieldName
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// to fieldID+1
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func mapFields(fields []string) map[string]uint16 {
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rv := make(map[string]uint16, len(fields))
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for i, fieldName := range fields {
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rv[fieldName] = uint16(i) + 1
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}
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return rv
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}
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// computeNewDocCount determines how many documents will be in the newly
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// merged segment when obsoleted docs are dropped
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func computeNewDocCount(segments []*SegmentBase, drops []*roaring.Bitmap) uint64 {
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var newDocCount uint64
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for segI, segment := range segments {
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newDocCount += segment.numDocs
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if drops[segI] != nil {
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newDocCount -= drops[segI].GetCardinality()
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}
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}
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return newDocCount
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}
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func persistMergedRest(segments []*SegmentBase, dropsIn []*roaring.Bitmap,
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fieldsInv []string, fieldsMap map[string]uint16, newDocNumsIn [][]uint64,
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newSegDocCount uint64, chunkFactor uint32,
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w *CountHashWriter) ([]uint64, uint64, error) {
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var bufReuse bytes.Buffer
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var bufMaxVarintLen64 []byte = make([]byte, binary.MaxVarintLen64)
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var bufLoc []uint64
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var postings *PostingsList
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var postItr *PostingsIterator
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rv := make([]uint64, len(fieldsInv))
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fieldDvLocs := make([]uint64, len(fieldsInv))
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tfEncoder := newChunkedIntCoder(uint64(chunkFactor), newSegDocCount-1)
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locEncoder := newChunkedIntCoder(uint64(chunkFactor), newSegDocCount-1)
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// docTermMap is keyed by docNum, where the array impl provides
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// better memory usage behavior than a sparse-friendlier hashmap
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// for when docs have much structural similarity (i.e., every doc
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// has a given field)
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var docTermMap [][]byte
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var vellumBuf bytes.Buffer
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// for each field
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for fieldID, fieldName := range fieldsInv {
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if fieldID != 0 {
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vellumBuf.Reset()
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}
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newVellum, err := vellum.New(&vellumBuf, nil)
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if err != nil {
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return nil, 0, err
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}
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// collect FST iterators from all active segments for this field
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var newDocNums [][]uint64
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var drops []*roaring.Bitmap
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var dicts []*Dictionary
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var itrs []vellum.Iterator
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for segmentI, segment := range segments {
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dict, err2 := segment.dictionary(fieldName)
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if err2 != nil {
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return nil, 0, err2
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}
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if dict != nil && dict.fst != nil {
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itr, err2 := dict.fst.Iterator(nil, nil)
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if err2 != nil && err2 != vellum.ErrIteratorDone {
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return nil, 0, err2
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}
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if itr != nil {
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newDocNums = append(newDocNums, newDocNumsIn[segmentI])
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drops = append(drops, dropsIn[segmentI])
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dicts = append(dicts, dict)
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itrs = append(itrs, itr)
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}
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}
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}
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if uint64(cap(docTermMap)) < newSegDocCount {
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docTermMap = make([][]byte, newSegDocCount)
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} else {
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docTermMap = docTermMap[0:newSegDocCount]
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for docNum := range docTermMap { // reset the docTermMap
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docTermMap[docNum] = docTermMap[docNum][:0]
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}
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}
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var prevTerm []byte
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newRoaring := roaring.NewBitmap()
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newRoaringLocs := roaring.NewBitmap()
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finishTerm := func(term []byte) error {
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if term == nil {
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return nil
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}
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tfEncoder.Close()
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locEncoder.Close()
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if newRoaring.GetCardinality() > 0 {
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// this field/term actually has hits in the new segment, lets write it down
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freqOffset := uint64(w.Count())
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_, err := tfEncoder.Write(w)
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if err != nil {
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return err
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}
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locOffset := uint64(w.Count())
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_, err = locEncoder.Write(w)
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if err != nil {
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return err
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}
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postingLocOffset := uint64(w.Count())
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_, err = writeRoaringWithLen(newRoaringLocs, w, &bufReuse, bufMaxVarintLen64)
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if err != nil {
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return err
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}
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postingOffset := uint64(w.Count())
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// write out the start of the term info
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n := binary.PutUvarint(bufMaxVarintLen64, freqOffset)
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_, err = w.Write(bufMaxVarintLen64[:n])
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if err != nil {
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return err
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}
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// write out the start of the loc info
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n = binary.PutUvarint(bufMaxVarintLen64, locOffset)
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_, err = w.Write(bufMaxVarintLen64[:n])
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if err != nil {
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return err
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}
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// write out the start of the posting locs
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n = binary.PutUvarint(bufMaxVarintLen64, postingLocOffset)
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_, err = w.Write(bufMaxVarintLen64[:n])
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if err != nil {
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return err
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}
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_, err = writeRoaringWithLen(newRoaring, w, &bufReuse, bufMaxVarintLen64)
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if err != nil {
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return err
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}
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err = newVellum.Insert(term, postingOffset)
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if err != nil {
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return err
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}
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}
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newRoaring = roaring.NewBitmap()
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newRoaringLocs = roaring.NewBitmap()
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tfEncoder.Reset()
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locEncoder.Reset()
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return nil
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}
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enumerator, err := newEnumerator(itrs)
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for err == nil {
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term, itrI, postingsOffset := enumerator.Current()
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if !bytes.Equal(prevTerm, term) {
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// if the term changed, write out the info collected
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// for the previous term
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err2 := finishTerm(prevTerm)
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if err2 != nil {
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return nil, 0, err2
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}
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}
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var err2 error
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postings, err2 = dicts[itrI].postingsListFromOffset(
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postingsOffset, drops[itrI], postings)
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if err2 != nil {
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return nil, 0, err2
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}
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newDocNumsI := newDocNums[itrI]
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postItr = postings.iterator(postItr)
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next, err2 := postItr.Next()
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for next != nil && err2 == nil {
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hitNewDocNum := newDocNumsI[next.Number()]
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if hitNewDocNum == docDropped {
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return nil, 0, fmt.Errorf("see hit with dropped doc num")
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}
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newRoaring.Add(uint32(hitNewDocNum))
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// encode norm bits
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norm := next.Norm()
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normBits := math.Float32bits(float32(norm))
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err = tfEncoder.Add(hitNewDocNum, next.Frequency(), uint64(normBits))
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if err != nil {
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return nil, 0, err
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}
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locs := next.Locations()
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if len(locs) > 0 {
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newRoaringLocs.Add(uint32(hitNewDocNum))
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for _, loc := range locs {
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if cap(bufLoc) < 5+len(loc.ArrayPositions()) {
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bufLoc = make([]uint64, 0, 5+len(loc.ArrayPositions()))
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}
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args := bufLoc[0:5]
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args[0] = uint64(fieldsMap[loc.Field()] - 1)
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args[1] = loc.Pos()
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args[2] = loc.Start()
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args[3] = loc.End()
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args[4] = uint64(len(loc.ArrayPositions()))
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args = append(args, loc.ArrayPositions()...)
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err = locEncoder.Add(hitNewDocNum, args...)
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if err != nil {
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return nil, 0, err
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}
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}
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}
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docTermMap[hitNewDocNum] =
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append(append(docTermMap[hitNewDocNum], term...), termSeparator)
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next, err2 = postItr.Next()
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}
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if err2 != nil {
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return nil, 0, err2
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}
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prevTerm = prevTerm[:0] // copy to prevTerm in case Next() reuses term mem
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prevTerm = append(prevTerm, term...)
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err = enumerator.Next()
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}
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if err != nil && err != vellum.ErrIteratorDone {
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return nil, 0, err
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}
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err = finishTerm(prevTerm)
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if err != nil {
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return nil, 0, err
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}
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dictOffset := uint64(w.Count())
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err = newVellum.Close()
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if err != nil {
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return nil, 0, err
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}
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vellumData := vellumBuf.Bytes()
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// write out the length of the vellum data
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n := binary.PutUvarint(bufMaxVarintLen64, uint64(len(vellumData)))
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_, err = w.Write(bufMaxVarintLen64[:n])
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if err != nil {
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return nil, 0, err
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}
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// write this vellum to disk
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_, err = w.Write(vellumData)
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if err != nil {
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return nil, 0, err
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}
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rv[fieldID] = dictOffset
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// update the field doc values
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fdvEncoder := newChunkedContentCoder(uint64(chunkFactor), newSegDocCount-1)
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for docNum, docTerms := range docTermMap {
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if len(docTerms) > 0 {
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err = fdvEncoder.Add(uint64(docNum), docTerms)
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if err != nil {
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return nil, 0, err
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}
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}
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}
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err = fdvEncoder.Close()
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if err != nil {
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return nil, 0, err
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}
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// get the field doc value offset
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fieldDvLocs[fieldID] = uint64(w.Count())
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// persist the doc value details for this field
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_, err = fdvEncoder.Write(w)
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if err != nil {
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return nil, 0, err
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}
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}
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fieldDvLocsOffset := uint64(w.Count())
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buf := bufMaxVarintLen64
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for _, offset := range fieldDvLocs {
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n := binary.PutUvarint(buf, uint64(offset))
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_, err := w.Write(buf[:n])
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if err != nil {
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return nil, 0, err
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}
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}
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return rv, fieldDvLocsOffset, nil
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}
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func mergeStoredAndRemap(segments []*SegmentBase, drops []*roaring.Bitmap,
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fieldsMap map[string]uint16, fieldsInv []string, fieldsSame bool, newSegDocCount uint64,
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w *CountHashWriter) (uint64, [][]uint64, error) {
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var rv [][]uint64 // The remapped or newDocNums for each segment.
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var newDocNum uint64
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var curr int
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var metaBuf bytes.Buffer
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var data, compressed []byte
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metaEncoder := govarint.NewU64Base128Encoder(&metaBuf)
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vals := make([][][]byte, len(fieldsInv))
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typs := make([][]byte, len(fieldsInv))
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poss := make([][][]uint64, len(fieldsInv))
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docNumOffsets := make([]uint64, newSegDocCount)
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// for each segment
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for segI, segment := range segments {
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segNewDocNums := make([]uint64, segment.numDocs)
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dropsI := drops[segI]
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// optimize when the field mapping is the same across all
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// segments and there are no deletions, via byte-copying
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// of stored docs bytes directly to the writer
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if fieldsSame && (dropsI == nil || dropsI.GetCardinality() == 0) {
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err := segment.copyStoredDocs(newDocNum, docNumOffsets, w)
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if err != nil {
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return 0, nil, err
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}
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for i := uint64(0); i < segment.numDocs; i++ {
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segNewDocNums[i] = newDocNum
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newDocNum++
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}
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rv = append(rv, segNewDocNums)
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continue
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}
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// for each doc num
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for docNum := uint64(0); docNum < segment.numDocs; docNum++ {
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// TODO: roaring's API limits docNums to 32-bits?
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if dropsI != nil && dropsI.Contains(uint32(docNum)) {
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segNewDocNums[docNum] = docDropped
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continue
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}
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segNewDocNums[docNum] = newDocNum
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curr = 0
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metaBuf.Reset()
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data = data[:0]
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compressed = compressed[:0]
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// collect all the data
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for i := 0; i < len(fieldsInv); i++ {
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vals[i] = vals[i][:0]
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typs[i] = typs[i][:0]
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poss[i] = poss[i][:0]
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}
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err := segment.VisitDocument(docNum, func(field string, typ byte, value []byte, pos []uint64) bool {
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fieldID := int(fieldsMap[field]) - 1
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vals[fieldID] = append(vals[fieldID], value)
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typs[fieldID] = append(typs[fieldID], typ)
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poss[fieldID] = append(poss[fieldID], pos)
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return true
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})
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if err != nil {
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return 0, nil, err
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}
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// now walk the fields in order
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for fieldID := range fieldsInv {
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storedFieldValues := vals[int(fieldID)]
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stf := typs[int(fieldID)]
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spf := poss[int(fieldID)]
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var err2 error
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curr, data, err2 = persistStoredFieldValues(fieldID,
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storedFieldValues, stf, spf, curr, metaEncoder, data)
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if err2 != nil {
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return 0, nil, err2
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}
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}
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metaEncoder.Close()
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metaBytes := metaBuf.Bytes()
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|
|
compressed = snappy.Encode(compressed, data)
|
|
|
|
// record where we're about to start writing
|
|
docNumOffsets[newDocNum] = uint64(w.Count())
|
|
|
|
// write out the meta len and compressed data len
|
|
_, err = writeUvarints(w, uint64(len(metaBytes)), uint64(len(compressed)))
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
// now write the meta
|
|
_, err = w.Write(metaBytes)
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
// now write the compressed data
|
|
_, err = w.Write(compressed)
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
|
|
newDocNum++
|
|
}
|
|
|
|
rv = append(rv, segNewDocNums)
|
|
}
|
|
|
|
// return value is the start of the stored index
|
|
storedIndexOffset := uint64(w.Count())
|
|
|
|
// now write out the stored doc index
|
|
for _, docNumOffset := range docNumOffsets {
|
|
err := binary.Write(w, binary.BigEndian, docNumOffset)
|
|
if err != nil {
|
|
return 0, nil, err
|
|
}
|
|
}
|
|
|
|
return storedIndexOffset, rv, nil
|
|
}
|
|
|
|
// copyStoredDocs writes out a segment's stored doc info, optimized by
|
|
// using a single Write() call for the entire set of bytes. The
|
|
// newDocNumOffsets is filled with the new offsets for each doc.
|
|
func (s *SegmentBase) copyStoredDocs(newDocNum uint64, newDocNumOffsets []uint64,
|
|
w *CountHashWriter) error {
|
|
if s.numDocs <= 0 {
|
|
return nil
|
|
}
|
|
|
|
indexOffset0, storedOffset0, _, _, _ :=
|
|
s.getDocStoredOffsets(0) // the segment's first doc
|
|
|
|
indexOffsetN, storedOffsetN, readN, metaLenN, dataLenN :=
|
|
s.getDocStoredOffsets(s.numDocs - 1) // the segment's last doc
|
|
|
|
storedOffset0New := uint64(w.Count())
|
|
|
|
storedBytes := s.mem[storedOffset0 : storedOffsetN+readN+metaLenN+dataLenN]
|
|
_, err := w.Write(storedBytes)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// remap the storedOffset's for the docs into new offsets relative
|
|
// to storedOffset0New, filling the given docNumOffsetsOut array
|
|
for indexOffset := indexOffset0; indexOffset <= indexOffsetN; indexOffset += 8 {
|
|
storedOffset := binary.BigEndian.Uint64(s.mem[indexOffset : indexOffset+8])
|
|
storedOffsetNew := storedOffset - storedOffset0 + storedOffset0New
|
|
newDocNumOffsets[newDocNum] = storedOffsetNew
|
|
newDocNum += 1
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// mergeFields builds a unified list of fields used across all the
|
|
// input segments, and computes whether the fields are the same across
|
|
// segments (which depends on fields to be sorted in the same way
|
|
// across segments)
|
|
func mergeFields(segments []*SegmentBase) (bool, []string) {
|
|
fieldsSame := true
|
|
|
|
var segment0Fields []string
|
|
if len(segments) > 0 {
|
|
segment0Fields = segments[0].Fields()
|
|
}
|
|
|
|
fieldsExist := map[string]struct{}{}
|
|
for _, segment := range segments {
|
|
fields := segment.Fields()
|
|
for fieldi, field := range fields {
|
|
fieldsExist[field] = struct{}{}
|
|
if len(segment0Fields) != len(fields) || segment0Fields[fieldi] != field {
|
|
fieldsSame = false
|
|
}
|
|
}
|
|
}
|
|
|
|
rv := make([]string, 0, len(fieldsExist))
|
|
// ensure _id stays first
|
|
rv = append(rv, "_id")
|
|
for k := range fieldsExist {
|
|
if k != "_id" {
|
|
rv = append(rv, k)
|
|
}
|
|
}
|
|
|
|
sort.Strings(rv[1:]) // leave _id as first
|
|
|
|
return fieldsSame, rv
|
|
}
|