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Merge pull request #1387 from xiangli-cmu/fix_raft

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Fix raft
This commit is contained in:
Xiang Li 2014-10-24 12:10:54 -07:00
commit 9fb02eb6fa
3 changed files with 31 additions and 11 deletions
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10
raft/log.go
View File

@ -53,8 +53,10 @@ func (l *raftLog) String() string {
return fmt.Sprintf("offset=%d committed=%d applied=%d len(ents)=%d", l.offset, l.committed, l.applied, len(l.ents))
}
func (l *raftLog) maybeAppend(index, logTerm, committed uint64, ents ...pb.Entry) bool {
lastnewi := index + uint64(len(ents))
// maybeAppend returns (0, false) if the entries cannot be appended. Otherwise,
// it returns (last index of entries, true).
func (l *raftLog) maybeAppend(index, logTerm, committed uint64, ents ...pb.Entry) (lastnewi uint64, ok bool) {
lastnewi = index + uint64(len(ents))
if l.matchTerm(index, logTerm) {
from := index + 1
ci := l.findConflict(from, ents)
@ -70,9 +72,9 @@ func (l *raftLog) maybeAppend(index, logTerm, committed uint64, ents ...pb.Entry
if l.committed < tocommit {
l.committed = tocommit
}
return true
return lastnewi, true
}
return false
return 0, false
}
func (l *raftLog) append(after uint64, ents ...pb.Entry) uint64 {

7
raft/raft.go
View File

@ -379,8 +379,8 @@ func (r *raft) Step(m pb.Message) error {
}
func (r *raft) handleAppendEntries(m pb.Message) {
if r.raftLog.maybeAppend(m.Index, m.LogTerm, m.Commit, m.Entries...) {
r.send(pb.Message{To: m.From, Type: pb.MsgAppResp, Index: r.raftLog.lastIndex()})
if mlastIndex, ok := r.raftLog.maybeAppend(m.Index, m.LogTerm, m.Commit, m.Entries...); ok {
r.send(pb.Message{To: m.From, Type: pb.MsgAppResp, Index: mlastIndex})
} else {
r.send(pb.Message{To: m.From, Type: pb.MsgAppResp, Index: m.Index, Reject: true})
}
@ -428,6 +428,9 @@ func stepLeader(r *raft, m pb.Message) {
r.appendEntry(e)
r.bcastAppend()
case pb.MsgAppResp:
if m.Index == 0 {
return
}
if m.Reject {
if r.prs[m.From].maybeDecrTo(m.Index) {
r.sendAppend(m.From)

25
raft/raft_test.go
View File

@ -778,16 +778,22 @@ func TestAllServerStepdown(t *testing.T) {
}
func TestLeaderAppResp(t *testing.T) {
// initial progress: match = 0; netx = 3
tests := []struct {
index uint64
reject bool
index uint64
reject bool
// progress
wmatch uint64
wnext uint64
// message
wmsgNum int
windex uint64
wcommitted uint64
}{
{3, true, 0, 0, 0}, // stale resp; no replies
{2, true, 1, 1, 0}, // denied resp; leader does not commit; decrese next and send probing msg
{2, false, 2, 2, 2}, // accept resp; leader commits; broadcast with commit index
{3, true, 0, 3, 0, 0, 0}, // stale resp; no replies
{2, true, 0, 2, 1, 1, 0}, // denied resp; leader does not commit; decrese next and send probing msg
{2, false, 2, 3, 2, 2, 2}, // accept resp; leader commits; broadcast with commit index
{0, false, 0, 3, 0, 0, 0}, // ignore heartbeat replies
}
for i, tt := range tests {
@ -799,6 +805,15 @@ func TestLeaderAppResp(t *testing.T) {
sm.becomeLeader()
sm.ReadMessages()
sm.Step(pb.Message{From: 2, Type: pb.MsgAppResp, Index: tt.index, Term: sm.Term, Reject: tt.reject})
p := sm.prs[2]
if p.match != tt.wmatch {
t.Errorf("#%d match = %d, want %d", i, p.match, tt.wmatch)
}
if p.next != tt.wnext {
t.Errorf("#%d next = %d, want %d", i, p.next, tt.wnext)
}
msgs := sm.ReadMessages()
if len(msgs) != tt.wmsgNum {