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part_iter.go
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part_iter.go
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// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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 stream
import (
"errors"
"fmt"
"io"
"sort"
"sync"
"github.com/apache/skywalking-banyandb/api/common"
"github.com/apache/skywalking-banyandb/pkg/bytes"
"github.com/apache/skywalking-banyandb/pkg/compress/zstd"
"github.com/apache/skywalking-banyandb/pkg/encoding"
"github.com/apache/skywalking-banyandb/pkg/fs"
"github.com/apache/skywalking-banyandb/pkg/logger"
)
type partIter struct {
err error
p *part
curBlock *blockMetadata
sids []common.SeriesID
primaryBlockMetadata []primaryBlockMetadata
bms []blockMetadata
compressedPrimaryBuf []byte
primaryBuf []byte
sidIdx int
minTimestamp int64
maxTimestamp int64
}
func (pi *partIter) reset() {
pi.curBlock = nil
pi.p = nil
pi.sids = nil
pi.sidIdx = 0
pi.primaryBlockMetadata = nil
pi.bms = nil
pi.compressedPrimaryBuf = pi.compressedPrimaryBuf[:0]
pi.primaryBuf = pi.primaryBuf[:0]
pi.err = nil
}
func (pi *partIter) init(bma *blockMetadataArray, p *part, sids []common.SeriesID, minTimestamp, maxTimestamp int64) {
pi.reset()
pi.curBlock = &blockMetadata{}
pi.p = p
pi.bms = bma.arr
pi.sids = sids
pi.minTimestamp = minTimestamp
pi.maxTimestamp = maxTimestamp
pi.primaryBlockMetadata = p.primaryBlockMetadata
pi.nextSeriesID()
}
func (pi *partIter) nextBlock() bool {
for {
if pi.err != nil {
return false
}
if len(pi.bms) == 0 {
if !pi.loadNextBlockMetadata() {
return false
}
}
if pi.findBlock() {
return true
}
}
}
func (pi *partIter) error() error {
if errors.Is(pi.err, io.EOF) {
return nil
}
return pi.err
}
func (pi *partIter) nextSeriesID() bool {
if pi.sidIdx >= len(pi.sids) {
pi.err = io.EOF
return false
}
pi.curBlock.seriesID = pi.sids[pi.sidIdx]
pi.sidIdx++
return true
}
func (pi *partIter) searchTargetSeriesID(sid common.SeriesID) bool {
if pi.curBlock.seriesID >= sid {
return true
}
if !pi.nextSeriesID() {
return false
}
if pi.curBlock.seriesID >= sid {
return true
}
sids := pi.sids[pi.sidIdx:]
pi.sidIdx += sort.Search(len(sids), func(i int) bool {
return sid <= sids[i]
})
if pi.sidIdx >= len(pi.sids) {
pi.sidIdx = len(pi.sids)
pi.err = io.EOF
return false
}
pi.curBlock.seriesID = pi.sids[pi.sidIdx]
pi.sidIdx++
return true
}
func (pi *partIter) loadNextBlockMetadata() bool {
for len(pi.primaryBlockMetadata) > 0 {
if !pi.searchTargetSeriesID(pi.primaryBlockMetadata[0].seriesID) {
return false
}
pi.primaryBlockMetadata = searchPBM(pi.primaryBlockMetadata, pi.curBlock.seriesID)
pbm := &pi.primaryBlockMetadata[0]
pi.primaryBlockMetadata = pi.primaryBlockMetadata[1:]
if pi.curBlock.seriesID < pbm.seriesID {
logger.Panicf("invariant violation: pi.curBlock.seriesID cannot be smaller than pbm.seriesID; got %+v vs %+v", &pi.curBlock.seriesID, &pbm.seriesID)
}
if pbm.maxTimestamp < pi.minTimestamp || pbm.minTimestamp > pi.maxTimestamp {
continue
}
var err error
pi.bms, err = pi.readPrimaryBlock(pi.bms[:0], pbm)
if err != nil {
pi.err = fmt.Errorf("cannot read primary block for part %q at offset %d with size %d: %w",
&pi.p.partMetadata, pbm.offset, pbm.size, err)
return false
}
return true
}
pi.err = io.EOF
return false
}
func searchPBM(pbmIndex []primaryBlockMetadata, sid common.SeriesID) []primaryBlockMetadata {
if sid < pbmIndex[0].seriesID {
logger.Panicf("invariant violation: sid cannot be smaller than pbmIndex[0]; got %d vs %d", sid, &pbmIndex[0].seriesID)
}
if sid == pbmIndex[0].seriesID {
return pbmIndex
}
n := sort.Search(len(pbmIndex), func(i int) bool {
return sid <= pbmIndex[i].seriesID
})
if n == 0 {
logger.Panicf("invariant violation: sort.Search returned 0 for sid > pbmIndex[0].seriesID; sid=%+v; pbmIndex[0].seriesID=%+v",
sid, &pbmIndex[0].seriesID)
}
return pbmIndex[n-1:]
}
func (pi *partIter) readPrimaryBlock(bms []blockMetadata, mr *primaryBlockMetadata) ([]blockMetadata, error) {
pi.compressedPrimaryBuf = bytes.ResizeOver(pi.compressedPrimaryBuf, int(mr.size))
fs.MustReadData(pi.p.primary, int64(mr.offset), pi.compressedPrimaryBuf)
var err error
pi.primaryBuf, err = zstd.Decompress(pi.primaryBuf[:0], pi.compressedPrimaryBuf)
if err != nil {
return nil, fmt.Errorf("cannot decompress index block: %w", err)
}
bms, err = unmarshalBlockMetadata(bms, pi.primaryBuf)
if err != nil {
return nil, fmt.Errorf("cannot unmarshal index block: %w", err)
}
return bms, nil
}
func (pi *partIter) findBlock() bool {
bhs := pi.bms
for len(bhs) > 0 {
sid := pi.curBlock.seriesID
if bhs[0].seriesID < sid {
n := sort.Search(len(bhs), func(i int) bool {
return sid <= bhs[i].seriesID
})
if n == len(bhs) {
break
}
bhs = bhs[n:]
}
bm := &bhs[0]
if bm.seriesID != sid {
if !pi.searchTargetSeriesID(bm.seriesID) {
return false
}
continue
}
if bm.timestamps.max < pi.minTimestamp {
bhs = bhs[1:]
continue
}
if bm.timestamps.min > pi.maxTimestamp {
if !pi.nextSeriesID() {
return false
}
continue
}
pi.curBlock = bm
pi.bms = bhs[1:]
return true
}
pi.bms = nil
return false
}
type partMergeIter struct {
seqReaders seqReaders
err error
primaryBlockMetadata []primaryBlockMetadata
compressedPrimaryBuf []byte
primaryBuf []byte
block blockPointer
primaryMetadataIdx int
}
func (pmi *partMergeIter) reset() {
pmi.err = nil
pmi.seqReaders.reset()
pmi.primaryBlockMetadata = nil
pmi.primaryMetadataIdx = 0
pmi.primaryBuf = pmi.primaryBuf[:0]
pmi.compressedPrimaryBuf = pmi.compressedPrimaryBuf[:0]
pmi.block.reset()
}
func (pmi *partMergeIter) mustInitFromPart(p *part) {
pmi.reset()
pmi.seqReaders.init(p)
pmi.primaryBlockMetadata = p.primaryBlockMetadata
}
func (pmi *partMergeIter) error() error {
if pmi.err == nil || errors.Is(pmi.err, io.EOF) {
return nil
}
return pmi.err
}
func (pmi *partMergeIter) nextBlockMetadata() bool {
if pmi.err != nil {
return false
}
pmi.block.reset()
if len(pmi.primaryBuf) == 0 {
if err := pmi.loadPrimaryBuf(); err != nil {
pmi.err = err
return false
}
}
if err := pmi.loadBlockMetadata(); err != nil {
pmi.err = err
return false
}
return true
}
func (pmi *partMergeIter) loadPrimaryBuf() error {
if pmi.primaryMetadataIdx >= len(pmi.primaryBlockMetadata) {
return io.EOF
}
pm := pmi.primaryBlockMetadata[pmi.primaryMetadataIdx]
pmi.compressedPrimaryBuf = bytes.ResizeOver(pmi.compressedPrimaryBuf, int(pm.size))
pmi.seqReaders.primary.mustReadFull(pmi.compressedPrimaryBuf)
var err error
pmi.primaryBuf, err = zstd.Decompress(pmi.primaryBuf[:0], pmi.compressedPrimaryBuf)
if err != nil {
return fmt.Errorf("cannot decompress primary block: %w", err)
}
pmi.primaryMetadataIdx++
return nil
}
func (pmi *partMergeIter) loadBlockMetadata() error {
pmi.block.reset()
var err error
pmi.primaryBuf, err = pmi.block.bm.unmarshal(pmi.primaryBuf)
if err != nil {
pm := pmi.primaryBlockMetadata[pmi.primaryMetadataIdx-1]
return fmt.Errorf("can't read block metadata from primary at %d: %w", pm.offset, err)
}
return nil
}
func (pmi *partMergeIter) mustLoadBlockData(decoder *encoding.BytesBlockDecoder, block *blockPointer) {
block.block.mustSeqReadFrom(decoder, &pmi.seqReaders, pmi.block.bm)
}
func generatePartMergeIter() *partMergeIter {
v := pmiPool.Get()
if v == nil {
return &partMergeIter{}
}
return v.(*partMergeIter)
}
func releasePartMergeIter(pmi *partMergeIter) {
pmi.reset()
pmiPool.Put(pmi)
}
var pmiPool sync.Pool
type partMergeIterHeap []*partMergeIter
func (pih *partMergeIterHeap) Len() int {
return len(*pih)
}
func (pih *partMergeIterHeap) Less(i, j int) bool {
x := *pih
return x[i].block.bm.less(&x[j].block.bm)
}
func (pih *partMergeIterHeap) Swap(i, j int) {
x := *pih
x[i], x[j] = x[j], x[i]
}
func (pih *partMergeIterHeap) Push(x interface{}) {
*pih = append(*pih, x.(*partMergeIter))
}
func (pih *partMergeIterHeap) Pop() interface{} {
a := *pih
v := a[len(a)-1]
*pih = a[:len(a)-1]
return v
}
func generateColumnValuesDecoder() *encoding.BytesBlockDecoder {
v := columnValuesDecoderPool.Get()
if v == nil {
return &encoding.BytesBlockDecoder{}
}
return v.(*encoding.BytesBlockDecoder)
}
func releaseColumnValuesDecoder(d *encoding.BytesBlockDecoder) {
d.Reset()
columnValuesDecoderPool.Put(d)
}
var columnValuesDecoderPool sync.Pool