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raft: record previous state is enough

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This commit is contained in:
Xiang Li 2014-09-08 21:15:35 -07:00
parent 0060c0749a
commit b0d865e845
1 changed files with 9 additions and 7 deletions
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16
raft/node.go
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@ -9,7 +9,10 @@ import (
"github.com/coreos/etcd/third_party/code.google.com/p/go.net/context"
)
var ErrStopped = errors.New("raft: stopped")
var (
EmptyState = pb.State{}
ErrStopped = errors.New("raft: stopped")
)
// Ready encapsulates the entries and messages that are ready to be saved to
// stable storage, committed or sent to other peers.
@ -35,8 +38,8 @@ func isStateEqual(a, b pb.State) bool {
return a.Term == b.Term && a.Vote == b.Vote && a.LastIndex == b.LastIndex
}
func (rd Ready) containsUpdates(prev Ready) bool {
return !isStateEqual(prev.State, rd.State) || len(rd.Entries) > 0 || len(rd.CommittedEntries) > 0 || len(rd.Messages) > 0
func (rd Ready) containsUpdates(prevSt pb.State) bool {
return !isStateEqual(prevSt, rd.State) || len(rd.Entries) > 0 || len(rd.CommittedEntries) > 0 || len(rd.Messages) > 0
}
type Node struct {
@ -83,8 +86,7 @@ func (n *Node) run(r *raft) {
readyc := n.readyc
var lead int64
var prev Ready
prev.State = r.State
prevSt := r.State
for {
if lead != r.lead {
@ -104,7 +106,7 @@ func (n *Node) run(r *raft) {
r.msgs,
}
if rd.containsUpdates(prev) {
if rd.containsUpdates(prevSt) {
readyc = n.readyc
} else {
readyc = nil
@ -121,7 +123,7 @@ func (n *Node) run(r *raft) {
case readyc <- rd:
r.raftLog.resetNextEnts()
r.raftLog.resetUnstable()
prev = rd
prevSt = rd.State
r.msgs = nil
case <-n.done:
return