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condensor_mmap_analyzer.go
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condensor_mmap_analyzer.go
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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: hello@weaviate.io
//
package hnsw
import (
"bufio"
"encoding/binary"
"io"
"os"
"sort"
"github.com/pkg/errors"
)
type mmapIndex struct {
nodes []mmapIndexNode
connectionsPerLevel int
}
func (mi *mmapIndex) UpsertNodeMaxLevel(node uint64, level uint16) {
n := sort.Search(len(mi.nodes), func(a int) bool {
return mi.nodes[a].id >= node
})
if n < len(mi.nodes) && mi.nodes[n].id == node {
// update
if mi.nodes[n].maxLevel < level {
mi.nodes[n].maxLevel = level
}
} else {
// insert
// See https://github.com/golang/go/wiki/SliceTricks#insert
mi.nodes = append(mi.nodes, mmapIndexNode{})
copy(mi.nodes[n+1:], mi.nodes[n:])
mi.nodes[n].id = node
mi.nodes[n].maxLevel = level
}
}
func (mi *mmapIndex) DeleteNode(node uint64) {
}
type mmapIndexNode struct {
id uint64
offset uint64
maxLevel uint16
}
func (n mmapIndexNode) Size(connectionsPerLevel int) int {
return int(n.maxLevel)*2 + // overhead for uint16 length indicators
connectionsPerLevel*int(n.maxLevel+1) // level 0 has 2x connections
}
type MmapCondensorAnalyzer struct {
reader *bufio.Reader
connectionsPerLevel int
index mmapIndex
}
func newMmapCondensorAnalyzer(connectionsPerLevel int) *MmapCondensorAnalyzer {
return &MmapCondensorAnalyzer{connectionsPerLevel: connectionsPerLevel}
}
func (a *MmapCondensorAnalyzer) Do(file *os.File) (mmapIndex, error) {
a.reader = bufio.NewReaderSize(file, 1024*1024)
a.index = mmapIndex{
connectionsPerLevel: a.connectionsPerLevel,
nodes: make([]mmapIndexNode, 0, 10000),
}
if err := a.loop(); err != nil {
return a.index, err
}
return a.index, nil
}
func (a *MmapCondensorAnalyzer) loop() error {
for {
ct, err := a.ReadCommitType(a.reader)
if err != nil {
if errors.Is(err, io.EOF) {
break
}
return err
}
switch ct {
case AddNode:
err = a.ReadNode(a.reader)
case SetEntryPointMaxLevel:
err = a.ReadEP(a.reader)
case AddLinkAtLevel:
err = a.ReadLink(a.reader)
case ReplaceLinksAtLevel:
err = a.ReadLinks(a.reader)
case AddTombstone:
err = a.ReadAddTombstone(a.reader)
case RemoveTombstone:
err = a.ReadRemoveTombstone(a.reader)
case ClearLinks:
err = a.ReadClearLinks(a.reader)
case DeleteNode:
err = a.ReadDeleteNode(a.reader)
case ResetIndex:
a.index.nodes = make([]mmapIndexNode, 0, 10000)
default:
err = errors.Errorf("unrecognized commit type %d", ct)
}
if err != nil {
// do not return nil, err, because the err could be a recoverable one
return err
}
}
return nil
}
func (a *MmapCondensorAnalyzer) ReadNode(r io.Reader) error {
id, err := a.readUint64(r)
if err != nil {
return err
}
level, err := a.readUint16(r)
if err != nil {
return err
}
a.index.UpsertNodeMaxLevel(id, level)
return nil
}
func (a *MmapCondensorAnalyzer) ReadEP(r io.Reader) error {
// TODO: is this an issue because of bufio Read vs ReadFull?
_, err := io.CopyN(io.Discard, r, 10)
return err
}
func (a *MmapCondensorAnalyzer) ReadLink(r io.Reader) error {
source, err := a.readUint64(r)
if err != nil {
return err
}
level, err := a.readUint16(r)
if err != nil {
return err
}
// TODO: is this an issue because of bufio Read vs ReadFull?
_, err = io.CopyN(io.Discard, r, 8)
if err != nil {
return err
}
a.index.UpsertNodeMaxLevel(source, level)
return nil
}
func (a *MmapCondensorAnalyzer) ReadLinks(r io.Reader) error {
source, err := a.readUint64(r)
if err != nil {
return err
}
level, err := a.readUint16(r)
if err != nil {
return err
}
length, err := a.readUint16(r)
if err != nil {
return err
}
a.index.UpsertNodeMaxLevel(source, level)
// TODO: is this an issue because of bufio Read vs ReadFull?
_, err = io.CopyN(io.Discard, r, 8*int64(length))
if err != nil {
return err
}
return nil
}
func (a *MmapCondensorAnalyzer) ReadAddTombstone(r io.Reader) error {
// TODO: is this an issue because of bufio Read vs ReadFull?
_, err := io.CopyN(io.Discard, r, 8)
return err
}
func (a *MmapCondensorAnalyzer) ReadRemoveTombstone(r io.Reader) error {
// TODO: is this an issue because of bufio Read vs ReadFull?
_, err := io.CopyN(io.Discard, r, 8)
return err
}
func (a *MmapCondensorAnalyzer) ReadClearLinks(r io.Reader) error {
// TODO: is this an issue because of bufio Read vs ReadFull?
_, err := io.CopyN(io.Discard, r, 8)
return err
}
func (a *MmapCondensorAnalyzer) ReadDeleteNode(r io.Reader) error {
id, err := a.readUint64(r)
if err != nil {
return err
}
a.index.DeleteNode(id)
return nil
}
func (a *MmapCondensorAnalyzer) readUint64(r io.Reader) (uint64, error) {
var value uint64
tmpBuf := make([]byte, 8)
_, err := io.ReadFull(r, tmpBuf)
if err != nil {
return 0, errors.Wrap(err, "failed to read uint64")
}
value = binary.LittleEndian.Uint64(tmpBuf)
return value, nil
}
func (a *MmapCondensorAnalyzer) readUint16(r io.Reader) (uint16, error) {
var value uint16
tmpBuf := make([]byte, 2)
_, err := io.ReadFull(r, tmpBuf)
if err != nil {
return 0, errors.Wrap(err, "failed to read uint16")
}
value = binary.LittleEndian.Uint16(tmpBuf)
return value, nil
}
func (a *MmapCondensorAnalyzer) ReadCommitType(r io.Reader) (HnswCommitType, error) {
tmpBuf := make([]byte, 1)
if _, err := io.ReadFull(r, tmpBuf); err != nil {
return 0, errors.Wrap(err, "failed to read commit type")
}
return HnswCommitType(tmpBuf[0]), nil
}