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45-use-statistical-testing

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Keepalive is based on per mesh and not per node.
Using total ordering mechanism similar to paxos to elect a leader
if leader doesn't update it's timestamp within 3 * keepAlive then
give the leader a gravestone and elect the next leader.
Leader is bassed on lexicographically ordered public key.
This commit is contained in:
Tim Beatham
2023-12-07 18:18:13 +00:00
parent 64885f1055
commit 661fb0d54c
13 changed files with 224 additions and 64 deletions
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52
pkg/crdt/two_phase_map_syncer.go
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@@ -10,7 +10,8 @@ import (
type SyncState int
const (
PREPARE SyncState = iota
HASH SyncState = iota
PREPARE
PRESENT
EXCHANGE
MERGE
@@ -26,13 +27,51 @@ type TwoPhaseSyncer struct {
peerMsg []byte
}
type TwoPhaseHash struct {
Hash uint64
}
type SyncFSM map[SyncState]func(*TwoPhaseSyncer) ([]byte, bool)
func prepare(syncer *TwoPhaseSyncer) ([]byte, bool) {
func hash(syncer *TwoPhaseSyncer) ([]byte, bool) {
hash := TwoPhaseHash{
Hash: syncer.manager.store.Clock.GetHash(),
}
var buffer bytes.Buffer
enc := gob.NewEncoder(&buffer)
err := enc.Encode(*syncer.mapState)
err := enc.Encode(hash)
if err != nil {
logging.Log.WriteInfof(err.Error())
}
syncer.IncrementState()
return buffer.Bytes(), true
}
func prepare(syncer *TwoPhaseSyncer) ([]byte, bool) {
var recvBuffer = bytes.NewBuffer(syncer.peerMsg)
dec := gob.NewDecoder(recvBuffer)
var hash TwoPhaseHash
err := dec.Decode(&hash)
if err != nil {
logging.Log.WriteInfof(err.Error())
}
// If vector clocks are equal then no need to merge state
// Helps to reduce bandwidth by detecting early
if hash.Hash == syncer.manager.store.Clock.GetHash() {
return nil, false
}
var buffer bytes.Buffer
enc := gob.NewEncoder(&buffer)
err = enc.Encode(*syncer.mapState)
if err != nil {
logging.Log.WriteInfof(err.Error())
@@ -124,11 +163,14 @@ func (t *TwoPhaseSyncer) RecvMessage(msg []byte) error {
func (t *TwoPhaseSyncer) Complete() {
logging.Log.WriteInfof("SYNC COMPLETED")
t.manager.store.Clock.IncrementClock()
if t.state == FINISHED || t.state == MERGE {
t.manager.store.Clock.IncrementClock()
}
}
func NewTwoPhaseSyncer(manager *TwoPhaseStoreMeshManager) *TwoPhaseSyncer {
var generateMessageFsm SyncFSM = SyncFSM{
HASH: hash,
PREPARE: prepare,
PRESENT: present,
EXCHANGE: exchange,
@@ -137,7 +179,7 @@ func NewTwoPhaseSyncer(manager *TwoPhaseStoreMeshManager) *TwoPhaseSyncer {
return &TwoPhaseSyncer{
manager: manager,
state: PREPARE,
state: HASH,
mapState: manager.store.GenerateMessage(),
generateMessageFSM: generateMessageFsm,
}