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reduce needle map memory usage by 25%

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This commit is contained in:
Chris Lu
2018-12-15 05:55:56 -08:00
parent 21315f709d
commit 42cb9b76c4
3 changed files with 63 additions and 33 deletions
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69
weed/storage/needle/compact_map.go
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@@ -10,21 +10,31 @@ const (
batch = 100000
)
type SectionalNeedleId uint32
const SectionalNeedleIdLimit = 1<<32 - 1
type SectionalNeedleValue struct {
Key SectionalNeedleId
Offset Offset `comment:"Volume offset"` //since aligned to 8 bytes, range is 4G*8=32G
Size uint32 `comment:"Size of the data portion"`
}
type CompactSection struct {
sync.RWMutex
values []NeedleValue
values []SectionalNeedleValue
overflow Overflow
start NeedleId
end NeedleId
counter int
}
type Overflow []NeedleValue
type Overflow []SectionalNeedleValue
func NewCompactSection(start NeedleId) *CompactSection {
return &CompactSection{
values: make([]NeedleValue, batch),
overflow: Overflow(make([]NeedleValue, 0)),
values: make([]SectionalNeedleValue, batch),
overflow: Overflow(make([]SectionalNeedleValue, 0)),
start: start,
}
}
@@ -35,22 +45,23 @@ func (cs *CompactSection) Set(key NeedleId, offset Offset, size uint32) (oldOffs
if key > cs.end {
cs.end = key
}
if i := cs.binarySearchValues(key); i >= 0 {
skey := SectionalNeedleId(key - cs.start)
if i := cs.binarySearchValues(skey); i >= 0 {
oldOffset, oldSize = cs.values[i].Offset, cs.values[i].Size
//println("key", key, "old size", ret)
cs.values[i].Offset, cs.values[i].Size = offset, size
} else {
needOverflow := cs.counter >= batch
needOverflow = needOverflow || cs.counter > 0 && cs.values[cs.counter-1].Key > key
needOverflow = needOverflow || cs.counter > 0 && cs.values[cs.counter-1].Key > skey
if needOverflow {
//println("start", cs.start, "counter", cs.counter, "key", key)
if oldValue, found := cs.overflow.findOverflowEntry(key); found {
if oldValue, found := cs.overflow.findOverflowEntry(skey); found {
oldOffset, oldSize = oldValue.Offset, oldValue.Size
}
cs.overflow = cs.overflow.setOverflowEntry(NeedleValue{Key: key, Offset: offset, Size: size})
cs.overflow = cs.overflow.setOverflowEntry(SectionalNeedleValue{Key: skey, Offset: offset, Size: size})
} else {
p := &cs.values[cs.counter]
p.Key, p.Offset, p.Size = key, offset, size
p.Key, p.Offset, p.Size = skey, offset, size
//println("added index", cs.counter, "key", key, cs.values[cs.counter].Key)
cs.counter++
}
@@ -61,16 +72,17 @@ func (cs *CompactSection) Set(key NeedleId, offset Offset, size uint32) (oldOffs
//return old entry size
func (cs *CompactSection) Delete(key NeedleId) uint32 {
skey := SectionalNeedleId(key - cs.start)
cs.Lock()
ret := uint32(0)
if i := cs.binarySearchValues(key); i >= 0 {
if i := cs.binarySearchValues(skey); i >= 0 {
if cs.values[i].Size > 0 {
ret = cs.values[i].Size
cs.values[i].Size = 0
}
}
if v, found := cs.overflow.findOverflowEntry(key); found {
cs.overflow = cs.overflow.deleteOverflowEntry(key)
if v, found := cs.overflow.findOverflowEntry(skey); found {
cs.overflow = cs.overflow.deleteOverflowEntry(skey)
ret = v.Size
}
cs.Unlock()
@@ -78,18 +90,21 @@ func (cs *CompactSection) Delete(key NeedleId) uint32 {
}
func (cs *CompactSection) Get(key NeedleId) (*NeedleValue, bool) {
cs.RLock()
if v, ok := cs.overflow.findOverflowEntry(key); ok {
skey := SectionalNeedleId(key - cs.start)
if v, ok := cs.overflow.findOverflowEntry(skey); ok {
cs.RUnlock()
return &v, true
nv := v.toNeedleValue(cs)
return &nv, true
}
if i := cs.binarySearchValues(key); i >= 0 {
if i := cs.binarySearchValues(skey); i >= 0 {
cs.RUnlock()
return &cs.values[i], true
nv := cs.values[i].toNeedleValue(cs)
return &nv, true
}
cs.RUnlock()
return nil, false
}
func (cs *CompactSection) binarySearchValues(key NeedleId) int {
func (cs *CompactSection) binarySearchValues(key SectionalNeedleId) int {
l, h := 0, cs.counter-1
if h >= 0 && cs.values[h].Key < key {
return -2
@@ -122,7 +137,7 @@ func NewCompactMap() *CompactMap {
func (cm *CompactMap) Set(key NeedleId, offset Offset, size uint32) (oldOffset Offset, oldSize uint32) {
x := cm.binarySearchCompactSection(key)
if x < 0 {
if x < 0 || (key-cm.list[x].start) > SectionalNeedleIdLimit {
//println(x, "creating", len(cm.list), "section, starting", key)
cs := NewCompactSection(key)
cm.list = append(cm.list, cs)
@@ -185,14 +200,14 @@ func (cm *CompactMap) Visit(visit func(NeedleValue) error) error {
for _, cs := range cm.list {
cs.RLock()
for _, v := range cs.overflow {
if err := visit(v); err != nil {
if err := visit(v.toNeedleValue(cs)); err != nil {
cs.RUnlock()
return err
}
}
for _, v := range cs.values {
if _, found := cs.overflow.findOverflowEntry(v.Key); !found {
if err := visit(v); err != nil {
if err := visit(v.toNeedleValue(cs)); err != nil {
cs.RUnlock()
return err
}
@@ -203,7 +218,7 @@ func (cm *CompactMap) Visit(visit func(NeedleValue) error) error {
return nil
}
func (o Overflow) deleteOverflowEntry(key NeedleId) Overflow {
func (o Overflow) deleteOverflowEntry(key SectionalNeedleId) Overflow {
length := len(o)
deleteCandidate := sort.Search(length, func(i int) bool {
return o[i].Key >= key
@@ -217,7 +232,7 @@ func (o Overflow) deleteOverflowEntry(key NeedleId) Overflow {
return o
}
func (o Overflow) setOverflowEntry(needleValue NeedleValue) Overflow {
func (o Overflow) setOverflowEntry(needleValue SectionalNeedleValue) Overflow {
insertCandidate := sort.Search(len(o), func(i int) bool {
return o[i].Key >= needleValue.Key
})
@@ -233,7 +248,7 @@ func (o Overflow) setOverflowEntry(needleValue NeedleValue) Overflow {
return o
}
func (o Overflow) findOverflowEntry(key NeedleId) (nv NeedleValue, found bool) {
func (o Overflow) findOverflowEntry(key SectionalNeedleId) (nv SectionalNeedleValue, found bool) {
foundCandidate := sort.Search(len(o), func(i int) bool {
return o[i].Key >= key
})
@@ -242,3 +257,11 @@ func (o Overflow) findOverflowEntry(key NeedleId) (nv NeedleValue, found bool) {
}
return nv, false
}
func (snv SectionalNeedleValue) toNeedleValue(cs *CompactSection) NeedleValue {
return NeedleValue{NeedleId(snv.Key) + cs.start, snv.Offset, snv.Size}
}
func (nv NeedleValue) toSectionalNeedleValue(cs *CompactSection) SectionalNeedleValue {
return SectionalNeedleValue{SectionalNeedleId(nv.Key - cs.start), nv.Offset, nv.Size}
}