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compaction_l0_view.go
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compaction_l0_view.go
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package datacoord
import (
"fmt"
"github.com/samber/lo"
"github.com/milvus-io/milvus-proto/go-api/v2/msgpb"
"github.com/milvus-io/milvus/pkg/util/paramtable"
)
// The LevelZeroSegments keeps the min group
type LevelZeroSegmentsView struct {
label *CompactionGroupLabel
segments []*SegmentView
earliestGrowingSegmentPos *msgpb.MsgPosition
}
var _ CompactionView = (*LevelZeroSegmentsView)(nil)
func (v *LevelZeroSegmentsView) String() string {
l0strings := lo.Map(v.segments, func(v *SegmentView, _ int) string {
return v.LevelZeroString()
})
return fmt.Sprintf("label=<%s>, posT=<%v>, l0 segments=%v",
v.label.String(),
v.earliestGrowingSegmentPos.GetTimestamp(),
l0strings)
}
func (v *LevelZeroSegmentsView) Append(segments ...*SegmentView) {
if v.segments == nil {
v.segments = segments
return
}
v.segments = append(v.segments, segments...)
}
func (v *LevelZeroSegmentsView) GetGroupLabel() *CompactionGroupLabel {
if v == nil {
return &CompactionGroupLabel{}
}
return v.label
}
func (v *LevelZeroSegmentsView) GetSegmentsView() []*SegmentView {
if v == nil {
return nil
}
return v.segments
}
func (v *LevelZeroSegmentsView) Equal(others []*SegmentView) bool {
if len(v.segments) != len(others) {
return false
}
IDSelector := func(v *SegmentView, _ int) int64 {
return v.ID
}
diffLeft, diffRight := lo.Difference(lo.Map(others, IDSelector), lo.Map(v.segments, IDSelector))
diffCount := len(diffLeft) + len(diffRight)
return diffCount == 0
}
// ForceTrigger triggers all qualified LevelZeroSegments according to views
func (v *LevelZeroSegmentsView) ForceTrigger() (CompactionView, string) {
// Only choose segments with position less than the earliest growing segment position
validSegments := lo.Filter(v.segments, func(view *SegmentView, _ int) bool {
return view.dmlPos.GetTimestamp() < v.earliestGrowingSegmentPos.GetTimestamp()
})
targetViews, reason := v.forceTrigger(validSegments)
if len(targetViews) > 0 {
return &LevelZeroSegmentsView{
label: v.label,
segments: targetViews,
earliestGrowingSegmentPos: v.earliestGrowingSegmentPos,
}, reason
}
return nil, ""
}
// Trigger triggers all qualified LevelZeroSegments according to views
func (v *LevelZeroSegmentsView) Trigger() (CompactionView, string) {
// Only choose segments with position less than the earliest growing segment position
validSegments := lo.Filter(v.segments, func(view *SegmentView, _ int) bool {
return view.dmlPos.GetTimestamp() < v.earliestGrowingSegmentPos.GetTimestamp()
})
targetViews, reason := v.minCountSizeTrigger(validSegments)
if len(targetViews) > 0 {
return &LevelZeroSegmentsView{
label: v.label,
segments: targetViews,
earliestGrowingSegmentPos: v.earliestGrowingSegmentPos,
}, reason
}
return nil, ""
}
// minCountSizeTrigger tries to trigger LevelZeroCompaction when segmentViews reaches minimum trigger conditions:
// 1. count >= minDeltaCount, OR
// 2. size >= minDeltaSize
func (v *LevelZeroSegmentsView) minCountSizeTrigger(segments []*SegmentView) (picked []*SegmentView, reason string) {
var (
minDeltaSize = paramtable.Get().DataCoordCfg.LevelZeroCompactionTriggerMinSize.GetAsFloat()
maxDeltaSize = paramtable.Get().DataCoordCfg.LevelZeroCompactionTriggerMaxSize.GetAsFloat()
minDeltaCount = paramtable.Get().DataCoordCfg.LevelZeroCompactionTriggerDeltalogMinNum.GetAsInt()
maxDeltaCount = paramtable.Get().DataCoordCfg.LevelZeroCompactionTriggerDeltalogMaxNum.GetAsInt()
)
curSize := float64(0)
// count >= minDeltaCount
if lo.SumBy(segments, func(view *SegmentView) int { return view.DeltalogCount }) >= minDeltaCount {
picked, curSize = pickByMaxCountSize(segments, maxDeltaSize, maxDeltaCount)
reason = fmt.Sprintf("level zero segments count reaches minForceTriggerCountLimit=%d, curDeltaSize=%.2f, curDeltaCount=%d", minDeltaCount, curSize, len(segments))
return
}
// size >= minDeltaSize
if lo.SumBy(segments, func(view *SegmentView) float64 { return view.DeltaSize }) >= minDeltaSize {
picked, curSize = pickByMaxCountSize(segments, maxDeltaSize, maxDeltaCount)
reason = fmt.Sprintf("level zero segments size reaches minForceTriggerSizeLimit=%.2f, curDeltaSize=%.2f, curDeltaCount=%d", minDeltaSize, curSize, len(segments))
return
}
return
}
// forceTrigger tries to trigger LevelZeroCompaction even when segmentsViews don't meet the minimum condition,
// the picked plan is still satisfied with the maximum condition
func (v *LevelZeroSegmentsView) forceTrigger(segments []*SegmentView) (picked []*SegmentView, reason string) {
var (
maxDeltaSize = paramtable.Get().DataCoordCfg.LevelZeroCompactionTriggerMaxSize.GetAsFloat()
maxDeltaCount = paramtable.Get().DataCoordCfg.LevelZeroCompactionTriggerDeltalogMaxNum.GetAsInt()
)
curSize := float64(0)
picked, curSize = pickByMaxCountSize(segments, maxDeltaSize, maxDeltaCount)
reason = fmt.Sprintf("level zero views force to trigger, curDeltaSize=%.2f, curDeltaCount=%d", curSize, len(segments))
return
}
// pickByMaxCountSize picks segments that count <= maxCount or size <= maxSize
func pickByMaxCountSize(segments []*SegmentView, maxSize float64, maxCount int) ([]*SegmentView, float64) {
var (
curDeltaCount = 0
curDeltaSize = float64(0)
)
idx := 0
for _, view := range segments {
targetCount := view.DeltalogCount + curDeltaCount
targetSize := view.DeltaSize + curDeltaSize
if (curDeltaCount != 0 && curDeltaSize != float64(0)) && (targetSize > maxSize || targetCount > maxCount) {
break
}
curDeltaCount = targetCount
curDeltaSize = targetSize
idx += 1
}
return segments[:idx], curDeltaSize
}