d6a997d8c1
Previously, firestorm would lookup docID's in the inFlight gtreap for every candidate docNum, and this change moves the lookup to outside of the loop.
157 lines
4.1 KiB
Go
157 lines
4.1 KiB
Go
// Copyright (c) 2015 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package firestorm
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import (
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"bytes"
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"math/rand"
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"sort"
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"sync"
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"github.com/steveyen/gtreap"
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"github.com/willf/bitset"
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)
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type Compensator struct {
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inFlightMutex sync.RWMutex
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maxRead uint64
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inFlight *gtreap.Treap
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deletedMutex sync.RWMutex
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deletedDocNumbers *bitset.BitSet
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}
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func NewCompensator() *Compensator {
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rv := Compensator{
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inFlight: gtreap.NewTreap(inFlightItemCompare),
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deletedDocNumbers: bitset.New(1000000),
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}
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return &rv
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}
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type Snapshot struct {
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maxRead uint64
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inFlight *gtreap.Treap
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deletedDocNumbers *bitset.BitSet
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}
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// returns which doc number is valid
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// if none, then 0
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func (s *Snapshot) Which(docID []byte, docNumList DocNumberList) uint64 {
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inFlightVal := s.inFlight.Get(&InFlightItem{docID: docID})
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sort.Sort(docNumList) // Descending ordering.
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for _, docNum := range docNumList {
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if docNum > 0 && docNum <= s.maxRead &&
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(inFlightVal == nil || inFlightVal.(*InFlightItem).docNum == docNum) &&
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!s.deletedDocNumbers.Test(uint(docNum)) {
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return docNum
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}
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}
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return 0
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}
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func (s *Snapshot) Valid(docID []byte, docNum uint64) bool {
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logger.Printf("checking validity of: '%s' - % x - %d", docID, docID, docNum)
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if docNum > s.maxRead {
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return false
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}
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logger.Printf("<= maxRead")
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inFlightVal := s.inFlight.Get(&InFlightItem{docID: docID})
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if inFlightVal != nil && inFlightVal.(*InFlightItem).docNum != docNum {
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return false
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}
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logger.Printf("not in flight")
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if s.deletedDocNumbers.Test(uint(docNum)) {
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return false
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}
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logger.Printf("not deleted")
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return true
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}
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func (c *Compensator) Mutate(docID []byte, docNum uint64) {
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c.inFlightMutex.Lock()
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defer c.inFlightMutex.Unlock()
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c.inFlight = c.inFlight.Upsert(&InFlightItem{docID: docID, docNum: docNum}, rand.Int())
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if docNum != 0 {
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c.maxRead = docNum
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}
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}
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func (c *Compensator) MutateBatch(inflightItems []*InFlightItem, lastDocNum uint64) {
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c.inFlightMutex.Lock()
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defer c.inFlightMutex.Unlock()
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for _, item := range inflightItems {
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c.inFlight = c.inFlight.Upsert(item, rand.Int())
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}
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c.maxRead = lastDocNum
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}
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func (c *Compensator) Migrate(docID []byte, docNum uint64, oldDocNums []uint64) {
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c.inFlightMutex.Lock()
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defer c.inFlightMutex.Unlock()
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c.deletedMutex.Lock()
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defer c.deletedMutex.Unlock()
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// clone deleted doc numbers and mutate
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if len(oldDocNums) > 0 {
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newDeletedDocNumbers := c.deletedDocNumbers.Clone()
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for _, oldDocNum := range oldDocNums {
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newDeletedDocNumbers.Set(uint(oldDocNum))
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}
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// update pointer
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c.deletedDocNumbers = newDeletedDocNumbers
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}
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// remove entry from in-flight if it still has same doc num
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val := c.inFlight.Get(&InFlightItem{docID: docID})
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if val != nil && val.(*InFlightItem).docNum == docNum {
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c.inFlight = c.inFlight.Delete(&InFlightItem{docID: docID})
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}
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}
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func (c *Compensator) GarbageCollect(docNums []uint64) {
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c.deletedMutex.Lock()
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defer c.deletedMutex.Unlock()
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for _, docNum := range docNums {
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c.deletedDocNumbers.Clear(uint(docNum))
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}
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}
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func (c *Compensator) Snapshot() *Snapshot {
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c.inFlightMutex.RLock()
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defer c.inFlightMutex.RUnlock()
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c.deletedMutex.RLock()
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defer c.deletedMutex.RUnlock()
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rv := Snapshot{
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maxRead: c.maxRead,
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inFlight: c.inFlight,
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deletedDocNumbers: c.deletedDocNumbers,
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}
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return &rv
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}
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func (c *Compensator) GarbageCount() uint64 {
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return uint64(c.deletedDocNumbers.Count())
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}
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//**************
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type InFlightItem struct {
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docID []byte
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docNum uint64
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}
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func inFlightItemCompare(a, b interface{}) int {
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return bytes.Compare(a.(*InFlightItem).docID, b.(*InFlightItem).docID)
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}
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