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detached_metadata.go
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/
detached_metadata.go
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/*
Copyright 2023 Huawei Cloud Computing Technologies Co., Ltd.
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 immutable
import (
"encoding/binary"
"fmt"
"hash/crc32"
"github.com/openGemini/openGemini/lib/fileops"
"github.com/openGemini/openGemini/lib/obs"
"github.com/openGemini/openGemini/lib/record"
"github.com/openGemini/openGemini/lib/request"
"go.uber.org/zap"
)
const (
MetaIndexSegmentNum = 16
)
type DetachedMetaDataReader struct {
isSort bool
ch chan *request.StreamReader
r fileops.BasicFileReader
task map[int]*SegmentTask
positionMap map[int64]*position
}
func NewDetachedMetaDataReader(path string, obsOpts *obs.ObsOptions, isSort bool) (*DetachedMetaDataReader, error) {
fd, err := obs.OpenObsFile(path, DataFile, obsOpts)
if err != nil {
return nil, err
}
dr := fileops.NewFileReader(fd, nil)
return &DetachedMetaDataReader{r: dr, isSort: isSort}, nil
}
type position struct {
schemaIndex []int
segmentID int
}
type SegmentTask struct {
fieldNum int
data []*request.StreamReader
}
func (reader *DetachedMetaDataReader) InitReadBatch(s []*SegmentMeta, schema record.Schemas) {
reader.task = make(map[int]*SegmentTask, len(s))
reader.positionMap = make(map[int64]*position, len(s))
offset := make([]int64, 0, len(s)*len(schema))
length := make([]int64, 0, len(s)*len(schema))
startSegmentIndex := -1
endSegmentIndex := -1
var currChunkMeta *ChunkMeta
for startSegmentIndex < len(s)-1 {
for endSegmentIndex < len(s)-1 {
endSegmentIndex += 1
currChunkMeta = s[endSegmentIndex].chunkMeta
if s[endSegmentIndex].id == currChunkMeta.segmentCount()-1 {
break
}
if endSegmentIndex == len(s)-1 || currChunkMeta != s[endSegmentIndex+1].chunkMeta {
break
}
if currChunkMeta.colMeta[0].entries[s[endSegmentIndex].id+1].offset > currChunkMeta.colMeta[len(currChunkMeta.colMeta)-1].entries[s[endSegmentIndex].id].offset {
break
}
}
for schemaIndex, field := range schema {
idx := currChunkMeta.columnIndex(&field)
if idx == -1 {
continue
}
tmpIndex := startSegmentIndex
for tmpIndex < endSegmentIndex {
tmpIndex += 1
currEntry := currChunkMeta.colMeta[idx].entries[s[tmpIndex].id]
if _, ok := reader.positionMap[currEntry.offset]; len(offset) == 0 || !ok {
offset = append(offset, currEntry.offset)
length = append(length, int64(currEntry.size))
reader.positionMap[currEntry.offset] = &position{schemaIndex: []int{schemaIndex}, segmentID: tmpIndex}
if _, ok := reader.task[tmpIndex]; ok {
reader.task[tmpIndex].fieldNum += 1
} else {
reader.task[tmpIndex] = &SegmentTask{
fieldNum: 1,
data: make([]*request.StreamReader, len(schema)),
}
}
} else {
reader.positionMap[currEntry.offset].schemaIndex = append(reader.positionMap[currEntry.offset].schemaIndex, schemaIndex)
}
}
}
startSegmentIndex = endSegmentIndex
}
reader.ch = make(chan *request.StreamReader, 1)
reader.r.StreamReadBatch(offset, length, reader.ch, MetaIndexSegmentNum)
}
func (reader *DetachedMetaDataReader) ReadBatch(dst *record.Record, decs *ReadContext) (*record.Record, error) {
schema := dst.Schema
timeIndex := schema.Len() - 1
finishSegment := -1
var err error
for r := range reader.ch {
if r.Err != nil {
return nil, r.Err
}
if len(r.Content) < crcSize {
err = fmt.Errorf("write wrong data")
break
}
if binary.BigEndian.Uint32(r.Content[:crcSize]) != crc32.ChecksumIEEE(r.Content[crcSize:]) {
err = fmt.Errorf("write wrong data")
break
}
r.Content = r.Content[crcSize:]
if p, exist := reader.positionMap[r.Offset]; exist {
reader.task[p.segmentID].data[p.schemaIndex[0]] = r
reader.task[p.segmentID].fieldNum--
if reader.task[p.segmentID].fieldNum == 0 {
finishSegment = p.segmentID
break
}
} else {
log.Error("read data fail", zap.String("file", reader.r.Name()), zap.Int64("chunk meta offset", r.Offset))
}
}
if err != nil {
for range reader.ch {
}
return nil, err
}
if finishSegment == -1 {
if len(reader.task) != 0 {
log.Error("read loss data fail", zap.String("file", reader.r.Name()))
}
return nil, nil
}
for _, v := range reader.task[finishSegment].data {
if v == nil {
continue
}
schemaIndex := reader.positionMap[v.Offset].schemaIndex
var err error
for _, index := range schemaIndex {
col := &record.ColVal{}
if index == timeIndex || schema[index].Name == "time" {
err = reader.decodeTimeColumn(col, decs, v.Content)
} else {
err = decodeColumnData(&schema[index], v.Content, col, decs, false)
}
dst.Column(index).AppendColVal(col, dst.Schemas()[index].Type, 0, col.Len)
if err != nil {
return nil, err
}
}
}
delete(reader.task, finishSegment)
dst.TryPadColumn()
return dst, nil
}
func (reader *DetachedMetaDataReader) decodeTimeColumn(timeCol *record.ColVal, decs *ReadContext, tmData []byte) error {
err := appendTimeColumnData(tmData, timeCol, decs, false)
if err != nil {
log.Error("decode time column fail", zap.Error(err))
}
return err
}