Use the old MemStore implementation

This commit is contained in:
Janos Guljas 2018-01-26 10:04:38 +01:00
parent b5a174a9e7
commit 0fb5df8ac2

View file

@ -19,9 +19,10 @@
package storage
import (
"bytes"
"fmt"
"sync"
"github.com/ethereum/go-ethereum/log"
)
const (
@ -31,321 +32,321 @@ const (
defaultCacheCapacity = 5000
)
// type MemStore struct {
// memtree *memTree
// entryCnt, capacity uint // stored entries
// accessCnt uint64 // access counter; oldest is thrown away when full
// dbAccessCnt uint64
// dbStore *DbStore
// lock sync.Mutex
// }
//
// /*
// a hash prefix subtree containing subtrees or one storage entry (but never both)
//
// - access[0] stores the smallest (oldest) access count value in this subtree
// - if it contains more subtrees and its subtree count is at least 4, access[1:2]
// stores the smallest access count in the first and second halves of subtrees
// (so that access[0] = min(access[1], access[2])
// - likewise, if subtree count is at least 8,
// access[1] = min(access[3], access[4])
// access[2] = min(access[5], access[6])
// (access[] is a binary tree inside the multi-bit leveled hash tree)
// */
//
// func NewMemStore(d *DbStore, capacity uint) (m *MemStore) {
// m = &MemStore{}
// m.memtree = newMemTree(memTreeFLW, nil, 0)
// m.dbStore = d
// m.setCapacity(capacity)
// return
// }
//
// type memTree struct {
// subtree []*memTree
// parent *memTree
// parentIdx uint
//
// bits uint // log2(subtree count)
// width uint // subtree count
//
// entry *Chunk // if subtrees are present, entry should be nil
// lastDBaccess uint64
// access []uint64
// }
//
// func newMemTree(b uint, parent *memTree, pidx uint) (node *memTree) {
// node = new(memTree)
// node.bits = b
// node.width = 1 << b
// node.subtree = make([]*memTree, node.width)
// node.access = make([]uint64, node.width-1)
// node.parent = parent
// node.parentIdx = pidx
// if parent != nil {
// parent.subtree[pidx] = node
// }
//
// return node
// }
//
// func (node *memTree) updateAccess(a uint64) {
// aidx := uint(0)
// var aa uint64
// oa := node.access[0]
// for node.access[aidx] == oa {
// node.access[aidx] = a
// if aidx > 0 {
// aa = node.access[((aidx-1)^1)+1]
// aidx = (aidx - 1) >> 1
// } else {
// pidx := node.parentIdx
// node = node.parent
// if node == nil {
// return
// }
// nn := node.subtree[pidx^1]
// if nn != nil {
// aa = nn.access[0]
// } else {
// aa = 0
// }
// aidx = (node.width + pidx - 2) >> 1
// }
//
// if (aa != 0) && (aa < a) {
// a = aa
// }
// }
// }
//
// func (s *MemStore) setCapacity(c uint) {
// s.lock.Lock()
// defer s.lock.Unlock()
//
// for c < s.entryCnt {
// s.removeOldest()
// }
// s.capacity = c
// }
//
// // entry (not its copy) is going to be in MemStore
// func (s *MemStore) Put(entry *Chunk) {
// if s.capacity == 0 {
// return
// }
//
// s.lock.Lock()
// defer s.lock.Unlock()
//
// if s.entryCnt >= s.capacity {
// s.removeOldest()
// }
//
// s.accessCnt++
//
// node := s.memtree
// bitpos := uint(0)
// for node.entry == nil {
// l := entry.Key.bits(bitpos, node.bits)
// st := node.subtree[l]
// if st == nil {
// st = newMemTree(memTreeLW, node, l)
// bitpos += node.bits
// node = st
// break
// }
// bitpos += node.bits
// node = st
// }
//
// if node.entry != nil {
//
// if node.entry.Key.isEqual(entry.Key) {
// node.updateAccess(s.accessCnt)
// if entry.SData == nil {
// entry.Size = node.entry.Size
// entry.SData = node.entry.SData
// }
// if entry.ReqC == nil {
// entry.ReqC = node.entry.ReqC
// }
// entry.C = node.entry.C
// node.entry = entry
// return
// }
//
// for node.entry != nil {
//
// l := node.entry.Key.bits(bitpos, node.bits)
// st := node.subtree[l]
// if st == nil {
// st = newMemTree(memTreeLW, node, l)
// }
// st.entry = node.entry
// node.entry = nil
// st.updateAccess(node.access[0])
//
// l = entry.Key.bits(bitpos, node.bits)
// st = node.subtree[l]
// if st == nil {
// st = newMemTree(memTreeLW, node, l)
// }
// bitpos += node.bits
// node = st
//
// }
// }
//
// node.entry = entry
// node.lastDBaccess = s.dbAccessCnt
// node.updateAccess(s.accessCnt)
// s.entryCnt++
// }
//
// func (s *MemStore) Get(hash Key) (chunk *Chunk, err error) {
// s.lock.Lock()
// defer s.lock.Unlock()
//
// node := s.memtree
// bitpos := uint(0)
// for node.entry == nil {
// l := hash.bits(bitpos, node.bits)
// st := node.subtree[l]
// if st == nil {
// return nil, ErrNotFound
// }
// bitpos += node.bits
// node = st
// }
//
// if node.entry.Key.isEqual(hash) {
// s.accessCnt++
// node.updateAccess(s.accessCnt)
// chunk = node.entry
// if s.dbAccessCnt-node.lastDBaccess > dbForceUpdateAccessCnt {
// s.dbAccessCnt++
// node.lastDBaccess = s.dbAccessCnt
// if s.dbStore != nil {
// s.dbStore.updateAccessCnt(hash)
// }
// }
// } else {
// err = ErrNotFound
// }
//
// return
// }
//
// func (s *MemStore) removeOldest() {
// node := s.memtree
// log.Warn("purge memstore")
// for node.entry == nil {
//
// aidx := uint(0)
// av := node.access[aidx]
//
// for aidx < node.width/2-1 {
// if av == node.access[aidx*2+1] {
// node.access[aidx] = node.access[aidx*2+2]
// aidx = aidx*2 + 1
// } else if av == node.access[aidx*2+2] {
// node.access[aidx] = node.access[aidx*2+1]
// aidx = aidx*2 + 2
// } else {
// panic(nil)
// }
// }
// pidx := aidx*2 + 2 - node.width
// if (node.subtree[pidx] != nil) && (av == node.subtree[pidx].access[0]) {
// if node.subtree[pidx+1] != nil {
// node.access[aidx] = node.subtree[pidx+1].access[0]
// } else {
// node.access[aidx] = 0
// }
// } else if (node.subtree[pidx+1] != nil) && (av == node.subtree[pidx+1].access[0]) {
// if node.subtree[pidx] != nil {
// node.access[aidx] = node.subtree[pidx].access[0]
// } else {
// node.access[aidx] = 0
// }
// pidx++
// } else {
// panic(nil)
// }
//
// //fmt.Println(pidx)
// node = node.subtree[pidx]
//
// }
//
// log.Trace(fmt.Sprintf("Memstore Clean: Waiting for chunk %v to be saved", node.entry.Key.Log()))
// <-node.entry.dbStored
// log.Trace(fmt.Sprintf("Memstore Clean: Chunk %v saved to DBStore. Ready to clear from mem.", node.entry.Key.Log()))
//
// if node.entry.ReqC == nil {
// node.entry = nil
// s.entryCnt--
// } else {
// return
// }
//
// node.access[0] = 0
//
// //---
//
// aidx := uint(0)
// for {
// aa := node.access[aidx]
// if aidx > 0 {
// aidx = (aidx - 1) >> 1
// } else {
// pidx := node.parentIdx
// node = node.parent
// if node == nil {
// return
// }
// aidx = (node.width + pidx - 2) >> 1
// }
// if (aa != 0) && ((aa < node.access[aidx]) || (node.access[aidx] == 0)) {
// node.access[aidx] = aa
// }
// }
// }
type MemStore struct {
m map[string]*Chunk
mu sync.RWMutex
memtree *memTree
entryCnt, capacity uint // stored entries
accessCnt uint64 // access counter; oldest is thrown away when full
dbAccessCnt uint64
dbStore *DbStore
lock sync.Mutex
}
/*
a hash prefix subtree containing subtrees or one storage entry (but never both)
- access[0] stores the smallest (oldest) access count value in this subtree
- if it contains more subtrees and its subtree count is at least 4, access[1:2]
stores the smallest access count in the first and second halves of subtrees
(so that access[0] = min(access[1], access[2])
- likewise, if subtree count is at least 8,
access[1] = min(access[3], access[4])
access[2] = min(access[5], access[6])
(access[] is a binary tree inside the multi-bit leveled hash tree)
*/
func NewMemStore(d *DbStore, capacity uint) (m *MemStore) {
return &MemStore{
m: make(map[string]*Chunk),
m = &MemStore{}
m.memtree = newMemTree(memTreeFLW, nil, 0)
m.dbStore = d
m.setCapacity(capacity)
return
}
type memTree struct {
subtree []*memTree
parent *memTree
parentIdx uint
bits uint // log2(subtree count)
width uint // subtree count
entry *Chunk // if subtrees are present, entry should be nil
lastDBaccess uint64
access []uint64
}
func newMemTree(b uint, parent *memTree, pidx uint) (node *memTree) {
node = new(memTree)
node.bits = b
node.width = 1 << b
node.subtree = make([]*memTree, node.width)
node.access = make([]uint64, node.width-1)
node.parent = parent
node.parentIdx = pidx
if parent != nil {
parent.subtree[pidx] = node
}
return node
}
func (node *memTree) updateAccess(a uint64) {
aidx := uint(0)
var aa uint64
oa := node.access[0]
for node.access[aidx] == oa {
node.access[aidx] = a
if aidx > 0 {
aa = node.access[((aidx-1)^1)+1]
aidx = (aidx - 1) >> 1
} else {
pidx := node.parentIdx
node = node.parent
if node == nil {
return
}
nn := node.subtree[pidx^1]
if nn != nil {
aa = nn.access[0]
} else {
aa = 0
}
aidx = (node.width + pidx - 2) >> 1
}
if (aa != 0) && (aa < a) {
a = aa
}
}
}
func (m *MemStore) Get(key Key) (*Chunk, error) {
m.mu.RLock()
defer m.mu.RUnlock()
c, ok := m.m[string(key[:])]
if !ok {
func (s *MemStore) setCapacity(c uint) {
s.lock.Lock()
defer s.lock.Unlock()
for c < s.entryCnt {
s.removeOldest()
}
s.capacity = c
}
// entry (not its copy) is going to be in MemStore
func (s *MemStore) Put(entry *Chunk) {
if s.capacity == 0 {
return
}
s.lock.Lock()
defer s.lock.Unlock()
if s.entryCnt >= s.capacity {
s.removeOldest()
}
s.accessCnt++
node := s.memtree
bitpos := uint(0)
for node.entry == nil {
l := entry.Key.bits(bitpos, node.bits)
st := node.subtree[l]
if st == nil {
st = newMemTree(memTreeLW, node, l)
bitpos += node.bits
node = st
break
}
bitpos += node.bits
node = st
}
if node.entry != nil {
if node.entry.Key.isEqual(entry.Key) {
node.updateAccess(s.accessCnt)
if entry.SData == nil {
entry.Size = node.entry.Size
entry.SData = node.entry.SData
}
if entry.ReqC == nil {
entry.ReqC = node.entry.ReqC
}
entry.C = node.entry.C
node.entry = entry
return
}
for node.entry != nil {
l := node.entry.Key.bits(bitpos, node.bits)
st := node.subtree[l]
if st == nil {
st = newMemTree(memTreeLW, node, l)
}
st.entry = node.entry
node.entry = nil
st.updateAccess(node.access[0])
l = entry.Key.bits(bitpos, node.bits)
st = node.subtree[l]
if st == nil {
st = newMemTree(memTreeLW, node, l)
}
bitpos += node.bits
node = st
}
}
node.entry = entry
node.lastDBaccess = s.dbAccessCnt
node.updateAccess(s.accessCnt)
s.entryCnt++
}
func (s *MemStore) Get(hash Key) (chunk *Chunk, err error) {
s.lock.Lock()
defer s.lock.Unlock()
node := s.memtree
bitpos := uint(0)
for node.entry == nil {
l := hash.bits(bitpos, node.bits)
st := node.subtree[l]
if st == nil {
return nil, ErrNotFound
}
if !bytes.Equal(c.Key, key) {
panic(fmt.Errorf("MemStore.Get: chunk key %s != req key %s", c.Key.Hex(), key.Hex()))
bitpos += node.bits
node = st
}
return c, nil
if node.entry.Key.isEqual(hash) {
s.accessCnt++
node.updateAccess(s.accessCnt)
chunk = node.entry
if s.dbAccessCnt-node.lastDBaccess > dbForceUpdateAccessCnt {
s.dbAccessCnt++
node.lastDBaccess = s.dbAccessCnt
if s.dbStore != nil {
s.dbStore.updateAccessCnt(hash)
}
}
} else {
err = ErrNotFound
}
return
}
func (m *MemStore) Put(c *Chunk) {
m.mu.Lock()
defer m.mu.Unlock()
m.m[string(c.Key[:])] = c
func (s *MemStore) removeOldest() {
node := s.memtree
log.Warn("purge memstore")
for node.entry == nil {
aidx := uint(0)
av := node.access[aidx]
for aidx < node.width/2-1 {
if av == node.access[aidx*2+1] {
node.access[aidx] = node.access[aidx*2+2]
aidx = aidx*2 + 1
} else if av == node.access[aidx*2+2] {
node.access[aidx] = node.access[aidx*2+1]
aidx = aidx*2 + 2
} else {
panic(nil)
}
}
pidx := aidx*2 + 2 - node.width
if (node.subtree[pidx] != nil) && (av == node.subtree[pidx].access[0]) {
if node.subtree[pidx+1] != nil {
node.access[aidx] = node.subtree[pidx+1].access[0]
} else {
node.access[aidx] = 0
}
} else if (node.subtree[pidx+1] != nil) && (av == node.subtree[pidx+1].access[0]) {
if node.subtree[pidx] != nil {
node.access[aidx] = node.subtree[pidx].access[0]
} else {
node.access[aidx] = 0
}
pidx++
} else {
panic(nil)
}
//fmt.Println(pidx)
node = node.subtree[pidx]
}
log.Trace(fmt.Sprintf("Memstore Clean: Waiting for chunk %v to be saved", node.entry.Key.Log()))
<-node.entry.dbStored
log.Trace(fmt.Sprintf("Memstore Clean: Chunk %v saved to DBStore. Ready to clear from mem.", node.entry.Key.Log()))
if node.entry.ReqC == nil {
node.entry = nil
s.entryCnt--
} else {
return
}
node.access[0] = 0
//---
aidx := uint(0)
for {
aa := node.access[aidx]
if aidx > 0 {
aidx = (aidx - 1) >> 1
} else {
pidx := node.parentIdx
node = node.parent
if node == nil {
return
}
aidx = (node.width + pidx - 2) >> 1
}
if (aa != 0) && ((aa < node.access[aidx]) || (node.access[aidx] == 0)) {
node.access[aidx] = aa
}
}
}
func (m *MemStore) setCapacity(n int) {
// type MemStore struct {
// m map[string]*Chunk
// mu sync.RWMutex
// }
}
// func NewMemStore(d *DbStore, capacity uint) (m *MemStore) {
// return &MemStore{
// m: make(map[string]*Chunk),
// }
// }
// func (m *MemStore) Get(key Key) (*Chunk, error) {
// m.mu.RLock()
// defer m.mu.RUnlock()
// c, ok := m.m[string(key[:])]
// if !ok {
// return nil, ErrNotFound
// }
// if !bytes.Equal(c.Key, key) {
// panic(fmt.Errorf("MemStore.Get: chunk key %s != req key %s", c.Key.Hex(), key.Hex()))
// }
// return c, nil
// }
// func (m *MemStore) Put(c *Chunk) {
// m.mu.Lock()
// defer m.mu.Unlock()
// m.m[string(c.Key[:])] = c
// }
// func (m *MemStore) setCapacity(n int) {
// }
// Close memstore
func (s *MemStore) Close() {}