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condensor.go
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condensor.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"
"fmt"
"math"
"os"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/weaviate/weaviate/adapters/repos/db/vector/compressionhelpers"
"github.com/weaviate/weaviate/entities/errorcompounder"
)
type MemoryCondensor struct {
newLogFile *os.File
newLog *bufWriter
logger logrus.FieldLogger
}
func (c *MemoryCondensor) Do(fileName string) error {
c.logger.WithField("action", "hnsw_condensing").Infof("start hnsw condensing")
defer c.logger.WithField("action", "hnsw_condensing_complete").Infof("completed hnsw condensing")
fd, err := os.Open(fileName)
if err != nil {
return errors.Wrap(err, "open commit log to be condensed")
}
defer fd.Close()
fdBuf := bufio.NewReaderSize(fd, 256*1024)
res, _, err := NewDeserializer(c.logger).Do(fdBuf, nil, true)
if err != nil {
return errors.Wrap(err, "read commit log to be condensed")
}
newLogFile, err := os.OpenFile(fmt.Sprintf("%s.condensed", fileName),
os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0o666)
if err != nil {
return errors.Wrap(err, "open new commit log file for writing")
}
c.newLogFile = newLogFile
c.newLog = NewWriterSize(c.newLogFile, 1*1024*1024)
if res.Compressed {
if err := c.AddPQ(res.PQData); err != nil {
return fmt.Errorf("write pq data: %w", err)
}
}
for _, node := range res.Nodes {
if node == nil {
// nil nodes occur when we've grown, but not inserted anything yet
continue
}
if node.level > 0 {
// nodes are implicitly added when they are first linked, if the level is
// not zero we know this node was new. If the level is zero it doesn't
// matter if it gets added explicitly or implicitly
if err := c.AddNode(node); err != nil {
return errors.Wrapf(err, "write node %d to commit log", node.id)
}
}
for level, links := range node.connections {
if res.ReplaceLinks(node.id, uint16(level)) {
if err := c.SetLinksAtLevel(node.id, level, links); err != nil {
return errors.Wrapf(err,
"write links for node %d at level %d to commit log", node.id, level)
}
} else {
if err := c.AddLinksAtLevel(node.id, uint16(level), links); err != nil {
return errors.Wrapf(err,
"write links for node %d at level %d to commit log", node.id, level)
}
}
}
}
if res.EntrypointChanged {
if err := c.SetEntryPointWithMaxLayer(res.Entrypoint,
int(res.Level)); err != nil {
return errors.Wrap(err, "write entrypoint to commit log")
}
}
for ts := range res.Tombstones {
if err := c.AddTombstone(ts); err != nil {
return errors.Wrapf(err,
"write tombstone for node %d to commit log", ts)
}
}
if err := c.newLog.Flush(); err != nil {
return errors.Wrap(err, "close new commit log")
}
if err := c.newLogFile.Close(); err != nil {
return errors.Wrap(err, "close new commit log")
}
if err := os.Remove(fileName); err != nil {
return errors.Wrap(err, "cleanup old (uncondensed) commit log")
}
return nil
}
func (c *MemoryCondensor) writeUint64(w *bufWriter, in uint64) error {
toWrite := make([]byte, 8)
binary.LittleEndian.PutUint64(toWrite[0:8], in)
_, err := w.Write(toWrite)
if err != nil {
return err
}
return nil
}
func (c *MemoryCondensor) writeUint16(w *bufWriter, in uint16) error {
toWrite := make([]byte, 2)
binary.LittleEndian.PutUint16(toWrite[0:2], in)
_, err := w.Write(toWrite)
if err != nil {
return err
}
return nil
}
func (c *MemoryCondensor) writeCommitType(w *bufWriter, in HnswCommitType) error {
toWrite := make([]byte, 1)
toWrite[0] = byte(in)
_, err := w.Write(toWrite)
if err != nil {
return err
}
return nil
}
func (c *MemoryCondensor) writeUint64Slice(w *bufWriter, in []uint64) error {
for _, v := range in {
err := c.writeUint64(w, v)
if err != nil {
return err
}
}
return nil
}
// AddNode adds an empty node
func (c *MemoryCondensor) AddNode(node *vertex) error {
ec := &errorcompounder.ErrorCompounder{}
ec.Add(c.writeCommitType(c.newLog, AddNode))
ec.Add(c.writeUint64(c.newLog, node.id))
ec.Add(c.writeUint16(c.newLog, uint16(node.level)))
return ec.ToError()
}
func (c *MemoryCondensor) SetLinksAtLevel(nodeid uint64, level int, targets []uint64) error {
ec := &errorcompounder.ErrorCompounder{}
ec.Add(c.writeCommitType(c.newLog, ReplaceLinksAtLevel))
ec.Add(c.writeUint64(c.newLog, nodeid))
ec.Add(c.writeUint16(c.newLog, uint16(level)))
targetLength := len(targets)
if targetLength > math.MaxUint16 {
// TODO: investigate why we get such massive connections
targetLength = math.MaxUint16
c.logger.WithField("action", "condense_commit_log").
WithField("original_length", len(targets)).
WithField("maximum_length", targetLength).
Warning("condensor length of connections would overflow uint16, cutting off")
}
ec.Add(c.writeUint16(c.newLog, uint16(targetLength)))
ec.Add(c.writeUint64Slice(c.newLog, targets[:targetLength]))
return ec.ToError()
}
func (c *MemoryCondensor) AddLinksAtLevel(nodeid uint64, level uint16, targets []uint64) error {
toWrite := make([]byte, 13+len(targets)*8)
toWrite[0] = byte(AddLinksAtLevel)
binary.LittleEndian.PutUint64(toWrite[1:9], nodeid)
binary.LittleEndian.PutUint16(toWrite[9:11], uint16(level))
binary.LittleEndian.PutUint16(toWrite[11:13], uint16(len(targets)))
for i, target := range targets {
offsetStart := 13 + i*8
offsetEnd := offsetStart + 8
binary.LittleEndian.PutUint64(toWrite[offsetStart:offsetEnd], target)
}
_, err := c.newLog.Write(toWrite)
return err
}
func (c *MemoryCondensor) AddLinkAtLevel(nodeid uint64, level uint16, target uint64) error {
ec := &errorcompounder.ErrorCompounder{}
ec.Add(c.writeCommitType(c.newLog, AddLinkAtLevel))
ec.Add(c.writeUint64(c.newLog, nodeid))
ec.Add(c.writeUint16(c.newLog, uint16(level)))
ec.Add(c.writeUint64(c.newLog, target))
return ec.ToError()
}
func (c *MemoryCondensor) SetEntryPointWithMaxLayer(id uint64, level int) error {
ec := &errorcompounder.ErrorCompounder{}
ec.Add(c.writeCommitType(c.newLog, SetEntryPointMaxLevel))
ec.Add(c.writeUint64(c.newLog, id))
ec.Add(c.writeUint16(c.newLog, uint16(level)))
return ec.ToError()
}
func (c *MemoryCondensor) AddTombstone(nodeid uint64) error {
ec := &errorcompounder.ErrorCompounder{}
ec.Add(c.writeCommitType(c.newLog, AddTombstone))
ec.Add(c.writeUint64(c.newLog, nodeid))
return ec.ToError()
}
func (c *MemoryCondensor) AddPQ(data compressionhelpers.PQData) error {
toWrite := make([]byte, 10)
toWrite[0] = byte(AddPQ)
binary.LittleEndian.PutUint16(toWrite[1:3], data.Dimensions)
toWrite[3] = byte(data.EncoderType)
binary.LittleEndian.PutUint16(toWrite[4:6], data.Ks)
binary.LittleEndian.PutUint16(toWrite[6:8], data.M)
toWrite[8] = data.EncoderDistribution
if data.UseBitsEncoding {
toWrite[9] = 1
} else {
toWrite[9] = 0
}
for _, encoder := range data.Encoders {
toWrite = append(toWrite, encoder.ExposeDataForRestore()...)
}
_, err := c.newLog.Write(toWrite)
return err
}
func NewMemoryCondensor(logger logrus.FieldLogger) *MemoryCondensor {
return &MemoryCondensor{logger: logger}
}