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raft_test.go
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raft_test.go
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// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package raft
import (
"bytes"
"fmt"
"math"
"math/rand"
"reflect"
"testing"
pb "github.com/coreos/etcd/raft/raftpb"
)
// nextEnts returns the appliable entries and updates the applied index
func nextEnts(r *raft, s *MemoryStorage) (ents []pb.Entry) {
// Transfer all unstable entries to "stable" storage.
s.Append(r.raftLog.unstableEntries())
r.raftLog.stableTo(r.raftLog.lastIndex(), r.raftLog.lastTerm())
ents = r.raftLog.nextEnts()
r.raftLog.appliedTo(r.raftLog.committed)
return ents
}
type stateMachine interface {
Step(m pb.Message) error
readMessages() []pb.Message
}
func (r *raft) readMessages() []pb.Message {
msgs := r.msgs
r.msgs = make([]pb.Message, 0)
return msgs
}
func TestProgressBecomeProbe(t *testing.T) {
match := uint64(1)
tests := []struct {
p *Progress
wnext uint64
}{
{
&Progress{State: ProgressStateReplicate, Match: match, Next: 5, ins: newInflights(256)},
2,
},
{
// snapshot finish
&Progress{State: ProgressStateSnapshot, Match: match, Next: 5, PendingSnapshot: 10, ins: newInflights(256)},
11,
},
{
// snapshot failure
&Progress{State: ProgressStateSnapshot, Match: match, Next: 5, PendingSnapshot: 0, ins: newInflights(256)},
2,
},
}
for i, tt := range tests {
tt.p.becomeProbe()
if tt.p.State != ProgressStateProbe {
t.Errorf("#%d: state = %s, want %s", i, tt.p.State, ProgressStateProbe)
}
if tt.p.Match != match {
t.Errorf("#%d: match = %d, want %d", i, tt.p.Match, match)
}
if tt.p.Next != tt.wnext {
t.Errorf("#%d: next = %d, want %d", i, tt.p.Next, tt.wnext)
}
}
}
func TestProgressBecomeReplicate(t *testing.T) {
p := &Progress{State: ProgressStateProbe, Match: 1, Next: 5, ins: newInflights(256)}
p.becomeReplicate()
if p.State != ProgressStateReplicate {
t.Errorf("state = %s, want %s", p.State, ProgressStateReplicate)
}
if p.Match != 1 {
t.Errorf("match = %d, want 1", p.Match)
}
if w := p.Match + 1; p.Next != w {
t.Errorf("next = %d, want %d", p.Next, w)
}
}
func TestProgressBecomeSnapshot(t *testing.T) {
p := &Progress{State: ProgressStateProbe, Match: 1, Next: 5, ins: newInflights(256)}
p.becomeSnapshot(10)
if p.State != ProgressStateSnapshot {
t.Errorf("state = %s, want %s", p.State, ProgressStateSnapshot)
}
if p.Match != 1 {
t.Errorf("match = %d, want 1", p.Match)
}
if p.PendingSnapshot != 10 {
t.Errorf("pendingSnapshot = %d, want 10", p.PendingSnapshot)
}
}
func TestProgressUpdate(t *testing.T) {
prevM, prevN := uint64(3), uint64(5)
tests := []struct {
update uint64
wm uint64
wn uint64
wok bool
}{
{prevM - 1, prevM, prevN, false}, // do not decrease match, next
{prevM, prevM, prevN, false}, // do not decrease next
{prevM + 1, prevM + 1, prevN, true}, // increase match, do not decrease next
{prevM + 2, prevM + 2, prevN + 1, true}, // increase match, next
}
for i, tt := range tests {
p := &Progress{
Match: prevM,
Next: prevN,
}
ok := p.maybeUpdate(tt.update)
if ok != tt.wok {
t.Errorf("#%d: ok= %v, want %v", i, ok, tt.wok)
}
if p.Match != tt.wm {
t.Errorf("#%d: match= %d, want %d", i, p.Match, tt.wm)
}
if p.Next != tt.wn {
t.Errorf("#%d: next= %d, want %d", i, p.Next, tt.wn)
}
}
}
func TestProgressMaybeDecr(t *testing.T) {
tests := []struct {
state ProgressStateType
m uint64
n uint64
rejected uint64
last uint64
w bool
wn uint64
}{
{
// state replicate and rejected is not greater than match
ProgressStateReplicate, 5, 10, 5, 5, false, 10,
},
{
// state replicate and rejected is not greater than match
ProgressStateReplicate, 5, 10, 4, 4, false, 10,
},
{
// state replicate and rejected is greater than match
// directly decrease to match+1
ProgressStateReplicate, 5, 10, 9, 9, true, 6,
},
{
// next-1 != rejected is always false
ProgressStateProbe, 0, 0, 0, 0, false, 0,
},
{
// next-1 != rejected is always false
ProgressStateProbe, 0, 10, 5, 5, false, 10,
},
{
// next>1 = decremented by 1
ProgressStateProbe, 0, 10, 9, 9, true, 9,
},
{
// next>1 = decremented by 1
ProgressStateProbe, 0, 2, 1, 1, true, 1,
},
{
// next<=1 = reset to 1
ProgressStateProbe, 0, 1, 0, 0, true, 1,
},
{
// decrease to min(rejected, last+1)
ProgressStateProbe, 0, 10, 9, 2, true, 3,
},
{
// rejected < 1, reset to 1
ProgressStateProbe, 0, 10, 9, 0, true, 1,
},
}
for i, tt := range tests {
p := &Progress{
State: tt.state,
Match: tt.m,
Next: tt.n,
}
if g := p.maybeDecrTo(tt.rejected, tt.last); g != tt.w {
t.Errorf("#%d: maybeDecrTo= %t, want %t", i, g, tt.w)
}
if gm := p.Match; gm != tt.m {
t.Errorf("#%d: match= %d, want %d", i, gm, tt.m)
}
if gn := p.Next; gn != tt.wn {
t.Errorf("#%d: next= %d, want %d", i, gn, tt.wn)
}
}
}
func TestProgressIsPaused(t *testing.T) {
tests := []struct {
state ProgressStateType
paused bool
w bool
}{
{ProgressStateProbe, false, false},
{ProgressStateProbe, true, true},
{ProgressStateReplicate, false, false},
{ProgressStateReplicate, true, false},
{ProgressStateSnapshot, false, true},
{ProgressStateSnapshot, true, true},
}
for i, tt := range tests {
p := &Progress{
State: tt.state,
Paused: tt.paused,
ins: newInflights(256),
}
if g := p.isPaused(); g != tt.w {
t.Errorf("#%d: paused= %t, want %t", i, g, tt.w)
}
}
}
// TestProgressResume ensures that progress.maybeUpdate and progress.maybeDecrTo
// will reset progress.paused.
func TestProgressResume(t *testing.T) {
p := &Progress{
Next: 2,
Paused: true,
}
p.maybeDecrTo(1, 1)
if p.Paused {
t.Errorf("paused= %v, want false", p.Paused)
}
p.Paused = true
p.maybeUpdate(2)
if p.Paused {
t.Errorf("paused= %v, want false", p.Paused)
}
}
// TestProgressResumeByHeartbeat ensures raft.heartbeat reset progress.paused by heartbeat.
func TestProgressResumeByHeartbeat(t *testing.T) {
r := newTestRaft(1, []uint64{1, 2}, 5, 1, NewMemoryStorage())
r.becomeCandidate()
r.becomeLeader()
r.prs[2].Paused = true
r.Step(pb.Message{From: 1, To: 1, Type: pb.MsgBeat})
if r.prs[2].Paused {
t.Errorf("paused = %v, want false", r.prs[2].Paused)
}
}
func TestProgressPaused(t *testing.T) {
r := newTestRaft(1, []uint64{1, 2}, 5, 1, NewMemoryStorage())
r.becomeCandidate()
r.becomeLeader()
r.Step(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}})
r.Step(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}})
r.Step(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}})
ms := r.readMessages()
if len(ms) != 1 {
t.Errorf("len(ms) = %d, want 1", len(ms))
}
}
func TestLeaderElection(t *testing.T) {
tests := []struct {
*network
state StateType
}{
{newNetwork(nil, nil, nil), StateLeader},
{newNetwork(nil, nil, nopStepper), StateLeader},
{newNetwork(nil, nopStepper, nopStepper), StateCandidate},
{newNetwork(nil, nopStepper, nopStepper, nil), StateCandidate},
{newNetwork(nil, nopStepper, nopStepper, nil, nil), StateLeader},
// three logs further along than 0
{newNetwork(nil, ents(1), ents(2), ents(1, 3), nil), StateFollower},
// logs converge
{newNetwork(ents(1), nil, ents(2), ents(1), nil), StateLeader},
}
for i, tt := range tests {
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
sm := tt.network.peers[1].(*raft)
if sm.state != tt.state {
t.Errorf("#%d: state = %s, want %s", i, sm.state, tt.state)
}
if g := sm.Term; g != 1 {
t.Errorf("#%d: term = %d, want %d", i, g, 1)
}
}
}
func TestLogReplication(t *testing.T) {
tests := []struct {
*network
msgs []pb.Message
wcommitted uint64
}{
{
newNetwork(nil, nil, nil),
[]pb.Message{
{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}},
},
2,
},
{
newNetwork(nil, nil, nil),
[]pb.Message{
{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}},
{From: 1, To: 2, Type: pb.MsgHup},
{From: 1, To: 2, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}},
},
4,
},
}
for i, tt := range tests {
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
for _, m := range tt.msgs {
tt.send(m)
}
for j, x := range tt.network.peers {
sm := x.(*raft)
if sm.raftLog.committed != tt.wcommitted {
t.Errorf("#%d.%d: committed = %d, want %d", i, j, sm.raftLog.committed, tt.wcommitted)
}
ents := []pb.Entry{}
for _, e := range nextEnts(sm, tt.network.storage[j]) {
if e.Data != nil {
ents = append(ents, e)
}
}
props := []pb.Message{}
for _, m := range tt.msgs {
if m.Type == pb.MsgProp {
props = append(props, m)
}
}
for k, m := range props {
if !bytes.Equal(ents[k].Data, m.Entries[0].Data) {
t.Errorf("#%d.%d: data = %d, want %d", i, j, ents[k].Data, m.Entries[0].Data)
}
}
}
}
}
func TestSingleNodeCommit(t *testing.T) {
tt := newNetwork(nil)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
sm := tt.peers[1].(*raft)
if sm.raftLog.committed != 3 {
t.Errorf("committed = %d, want %d", sm.raftLog.committed, 3)
}
}
// TestCannotCommitWithoutNewTermEntry tests the entries cannot be committed
// when leader changes, no new proposal comes in and ChangeTerm proposal is
// filtered.
func TestCannotCommitWithoutNewTermEntry(t *testing.T) {
tt := newNetwork(nil, nil, nil, nil, nil)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
// 0 cannot reach 2,3,4
tt.cut(1, 3)
tt.cut(1, 4)
tt.cut(1, 5)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
sm := tt.peers[1].(*raft)
if sm.raftLog.committed != 1 {
t.Errorf("committed = %d, want %d", sm.raftLog.committed, 1)
}
// network recovery
tt.recover()
// avoid committing ChangeTerm proposal
tt.ignore(pb.MsgApp)
// elect 2 as the new leader with term 2
tt.send(pb.Message{From: 2, To: 2, Type: pb.MsgHup})
// no log entries from previous term should be committed
sm = tt.peers[2].(*raft)
if sm.raftLog.committed != 1 {
t.Errorf("committed = %d, want %d", sm.raftLog.committed, 1)
}
tt.recover()
// send heartbeat; reset wait
tt.send(pb.Message{From: 2, To: 2, Type: pb.MsgBeat})
// append an entry at current term
tt.send(pb.Message{From: 2, To: 2, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
// expect the committed to be advanced
if sm.raftLog.committed != 5 {
t.Errorf("committed = %d, want %d", sm.raftLog.committed, 5)
}
}
// TestCommitWithoutNewTermEntry tests the entries could be committed
// when leader changes, no new proposal comes in.
func TestCommitWithoutNewTermEntry(t *testing.T) {
tt := newNetwork(nil, nil, nil, nil, nil)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
// 0 cannot reach 2,3,4
tt.cut(1, 3)
tt.cut(1, 4)
tt.cut(1, 5)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("some data")}}})
sm := tt.peers[1].(*raft)
if sm.raftLog.committed != 1 {
t.Errorf("committed = %d, want %d", sm.raftLog.committed, 1)
}
// network recovery
tt.recover()
// elect 1 as the new leader with term 2
// after append a ChangeTerm entry from the current term, all entries
// should be committed
tt.send(pb.Message{From: 2, To: 2, Type: pb.MsgHup})
if sm.raftLog.committed != 4 {
t.Errorf("committed = %d, want %d", sm.raftLog.committed, 4)
}
}
func TestDuelingCandidates(t *testing.T) {
a := newTestRaft(1, []uint64{1, 2, 3}, 10, 1, NewMemoryStorage())
b := newTestRaft(2, []uint64{1, 2, 3}, 10, 1, NewMemoryStorage())
c := newTestRaft(3, []uint64{1, 2, 3}, 10, 1, NewMemoryStorage())
nt := newNetwork(a, b, c)
nt.cut(1, 3)
nt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
nt.send(pb.Message{From: 3, To: 3, Type: pb.MsgHup})
// 1 becomes leader since it receives votes from 1 and 2
sm := nt.peers[1].(*raft)
if sm.state != StateLeader {
t.Errorf("state = %s, want %s", sm.state, StateLeader)
}
// 3 stays as candidate since it receives a vote from 3 and a rejection from 2
sm = nt.peers[3].(*raft)
if sm.state != StateCandidate {
t.Errorf("state = %s, want %s", sm.state, StateCandidate)
}
nt.recover()
// candidate 3 now increases its term and tries to vote again
// we expect it to disrupt the leader 1 since it has a higher term
// 3 will be follower again since both 1 and 2 rejects its vote request since 3 does not have a long enough log
nt.send(pb.Message{From: 3, To: 3, Type: pb.MsgHup})
wlog := &raftLog{
storage: &MemoryStorage{ents: []pb.Entry{{}, {Data: nil, Term: 1, Index: 1}}},
committed: 1,
unstable: unstable{offset: 2},
}
tests := []struct {
sm *raft
state StateType
term uint64
raftLog *raftLog
}{
{a, StateFollower, 2, wlog},
{b, StateFollower, 2, wlog},
{c, StateFollower, 2, newLog(NewMemoryStorage(), raftLogger)},
}
for i, tt := range tests {
if g := tt.sm.state; g != tt.state {
t.Errorf("#%d: state = %s, want %s", i, g, tt.state)
}
if g := tt.sm.Term; g != tt.term {
t.Errorf("#%d: term = %d, want %d", i, g, tt.term)
}
base := ltoa(tt.raftLog)
if sm, ok := nt.peers[1+uint64(i)].(*raft); ok {
l := ltoa(sm.raftLog)
if g := diffu(base, l); g != "" {
t.Errorf("#%d: diff:\n%s", i, g)
}
} else {
t.Logf("#%d: empty log", i)
}
}
}
func TestCandidateConcede(t *testing.T) {
tt := newNetwork(nil, nil, nil)
tt.isolate(1)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
tt.send(pb.Message{From: 3, To: 3, Type: pb.MsgHup})
// heal the partition
tt.recover()
// send heartbeat; reset wait
tt.send(pb.Message{From: 3, To: 3, Type: pb.MsgBeat})
data := []byte("force follower")
// send a proposal to 3 to flush out a MsgApp to 1
tt.send(pb.Message{From: 3, To: 3, Type: pb.MsgProp, Entries: []pb.Entry{{Data: data}}})
// send heartbeat; flush out commit
tt.send(pb.Message{From: 3, To: 3, Type: pb.MsgBeat})
a := tt.peers[1].(*raft)
if g := a.state; g != StateFollower {
t.Errorf("state = %s, want %s", g, StateFollower)
}
if g := a.Term; g != 1 {
t.Errorf("term = %d, want %d", g, 1)
}
wantLog := ltoa(&raftLog{
storage: &MemoryStorage{
ents: []pb.Entry{{}, {Data: nil, Term: 1, Index: 1}, {Term: 1, Index: 2, Data: data}},
},
unstable: unstable{offset: 3},
committed: 2,
})
for i, p := range tt.peers {
if sm, ok := p.(*raft); ok {
l := ltoa(sm.raftLog)
if g := diffu(wantLog, l); g != "" {
t.Errorf("#%d: diff:\n%s", i, g)
}
} else {
t.Logf("#%d: empty log", i)
}
}
}
func TestSingleNodeCandidate(t *testing.T) {
tt := newNetwork(nil)
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
sm := tt.peers[1].(*raft)
if sm.state != StateLeader {
t.Errorf("state = %d, want %d", sm.state, StateLeader)
}
}
func TestOldMessages(t *testing.T) {
tt := newNetwork(nil, nil, nil)
// make 0 leader @ term 3
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
tt.send(pb.Message{From: 2, To: 2, Type: pb.MsgHup})
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
// pretend we're an old leader trying to make progress; this entry is expected to be ignored.
tt.send(pb.Message{From: 2, To: 1, Type: pb.MsgApp, Term: 2, Entries: []pb.Entry{{Index: 3, Term: 2}}})
// commit a new entry
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}})
ilog := &raftLog{
storage: &MemoryStorage{
ents: []pb.Entry{
{}, {Data: nil, Term: 1, Index: 1},
{Data: nil, Term: 2, Index: 2}, {Data: nil, Term: 3, Index: 3},
{Data: []byte("somedata"), Term: 3, Index: 4},
},
},
unstable: unstable{offset: 5},
committed: 4,
}
base := ltoa(ilog)
for i, p := range tt.peers {
if sm, ok := p.(*raft); ok {
l := ltoa(sm.raftLog)
if g := diffu(base, l); g != "" {
t.Errorf("#%d: diff:\n%s", i, g)
}
} else {
t.Logf("#%d: empty log", i)
}
}
}
// TestOldMessagesReply - optimization - reply with new term.
func TestProposal(t *testing.T) {
tests := []struct {
*network
success bool
}{
{newNetwork(nil, nil, nil), true},
{newNetwork(nil, nil, nopStepper), true},
{newNetwork(nil, nopStepper, nopStepper), false},
{newNetwork(nil, nopStepper, nopStepper, nil), false},
{newNetwork(nil, nopStepper, nopStepper, nil, nil), true},
}
for j, tt := range tests {
send := func(m pb.Message) {
defer func() {
// only recover is we expect it to panic so
// panics we don't expect go up.
if !tt.success {
e := recover()
if e != nil {
t.Logf("#%d: err: %s", j, e)
}
}
}()
tt.send(m)
}
data := []byte("somedata")
// promote 0 the leader
send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
send(pb.Message{From: 1, To: 1, Type: pb.MsgProp, Entries: []pb.Entry{{Data: data}}})
wantLog := newLog(NewMemoryStorage(), raftLogger)
if tt.success {
wantLog = &raftLog{
storage: &MemoryStorage{
ents: []pb.Entry{{}, {Data: nil, Term: 1, Index: 1}, {Term: 1, Index: 2, Data: data}},
},
unstable: unstable{offset: 3},
committed: 2}
}
base := ltoa(wantLog)
for i, p := range tt.peers {
if sm, ok := p.(*raft); ok {
l := ltoa(sm.raftLog)
if g := diffu(base, l); g != "" {
t.Errorf("#%d: diff:\n%s", i, g)
}
} else {
t.Logf("#%d: empty log", i)
}
}
sm := tt.network.peers[1].(*raft)
if g := sm.Term; g != 1 {
t.Errorf("#%d: term = %d, want %d", j, g, 1)
}
}
}
func TestProposalByProxy(t *testing.T) {
data := []byte("somedata")
tests := []*network{
newNetwork(nil, nil, nil),
newNetwork(nil, nil, nopStepper),
}
for j, tt := range tests {
// promote 0 the leader
tt.send(pb.Message{From: 1, To: 1, Type: pb.MsgHup})
// propose via follower
tt.send(pb.Message{From: 2, To: 2, Type: pb.MsgProp, Entries: []pb.Entry{{Data: []byte("somedata")}}})
wantLog := &raftLog{
storage: &MemoryStorage{
ents: []pb.Entry{{}, {Data: nil, Term: 1, Index: 1}, {Term: 1, Data: data, Index: 2}},
},
unstable: unstable{offset: 3},
committed: 2}
base := ltoa(wantLog)
for i, p := range tt.peers {
if sm, ok := p.(*raft); ok {
l := ltoa(sm.raftLog)
if g := diffu(base, l); g != "" {
t.Errorf("#%d: diff:\n%s", i, g)
}
} else {
t.Logf("#%d: empty log", i)
}
}
sm := tt.peers[1].(*raft)
if g := sm.Term; g != 1 {
t.Errorf("#%d: term = %d, want %d", j, g, 1)
}
}
}
func TestCommit(t *testing.T) {
tests := []struct {
matches []uint64
logs []pb.Entry
smTerm uint64
w uint64
}{
// single
{[]uint64{1}, []pb.Entry{{Index: 1, Term: 1}}, 1, 1},
{[]uint64{1}, []pb.Entry{{Index: 1, Term: 1}}, 2, 0},
{[]uint64{2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}}, 2, 2},
{[]uint64{1}, []pb.Entry{{Index: 1, Term: 2}}, 2, 1},
// odd
{[]uint64{2, 1, 1}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}}, 1, 1},
{[]uint64{2, 1, 1}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 1}}, 2, 0},
{[]uint64{2, 1, 2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}}, 2, 2},
{[]uint64{2, 1, 2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 1}}, 2, 0},
// even
{[]uint64{2, 1, 1, 1}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}}, 1, 1},
{[]uint64{2, 1, 1, 1}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 1}}, 2, 0},
{[]uint64{2, 1, 1, 2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}}, 1, 1},
{[]uint64{2, 1, 1, 2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 1}}, 2, 0},
{[]uint64{2, 1, 2, 2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}}, 2, 2},
{[]uint64{2, 1, 2, 2}, []pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 1}}, 2, 0},
}
for i, tt := range tests {
storage := NewMemoryStorage()
storage.Append(tt.logs)
storage.hardState = pb.HardState{Term: tt.smTerm}
sm := newTestRaft(1, []uint64{1}, 5, 1, storage)
for j := 0; j < len(tt.matches); j++ {
sm.setProgress(uint64(j)+1, tt.matches[j], tt.matches[j]+1)
}
sm.maybeCommit()
if g := sm.raftLog.committed; g != tt.w {
t.Errorf("#%d: committed = %d, want %d", i, g, tt.w)
}
}
}
func TestPastElectionTimeout(t *testing.T) {
tests := []struct {
elapse int
wprobability float64
round bool
}{
{5, 0, false},
{10, 0.1, true},
{13, 0.4, true},
{15, 0.6, true},
{18, 0.9, true},
{20, 1, false},
}
for i, tt := range tests {
sm := newTestRaft(1, []uint64{1}, 10, 1, NewMemoryStorage())
sm.electionElapsed = tt.elapse
c := 0
for j := 0; j < 10000; j++ {
sm.resetRandomizedElectionTimeout()
if sm.pastElectionTimeout() {
c++
}
}
got := float64(c) / 10000.0
if tt.round {
got = math.Floor(got*10+0.5) / 10.0
}
if got != tt.wprobability {
t.Errorf("#%d: probability = %v, want %v", i, got, tt.wprobability)
}
}
}
// ensure that the Step function ignores the message from old term and does not pass it to the
// actual stepX function.
func TestStepIgnoreOldTermMsg(t *testing.T) {
called := false
fakeStep := func(r *raft, m pb.Message) {
called = true
}
sm := newTestRaft(1, []uint64{1}, 10, 1, NewMemoryStorage())
sm.step = fakeStep
sm.Term = 2
sm.Step(pb.Message{Type: pb.MsgApp, Term: sm.Term - 1})
if called {
t.Errorf("stepFunc called = %v , want %v", called, false)
}
}
// TestHandleMsgApp ensures:
// 1. Reply false if log doesn’t contain an entry at prevLogIndex whose term matches prevLogTerm.
// 2. If an existing entry conflicts with a new one (same index but different terms),
// delete the existing entry and all that follow it; append any new entries not already in the log.
// 3. If leaderCommit > commitIndex, set commitIndex = min(leaderCommit, index of last new entry).
func TestHandleMsgApp(t *testing.T) {
tests := []struct {
m pb.Message
wIndex uint64
wCommit uint64
wReject bool
}{
// Ensure 1
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 3, Index: 2, Commit: 3}, 2, 0, true}, // previous log mismatch
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 3, Index: 3, Commit: 3}, 2, 0, true}, // previous log non-exist
// Ensure 2
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 1, Index: 1, Commit: 1}, 2, 1, false},
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 0, Index: 0, Commit: 1, Entries: []pb.Entry{{Index: 1, Term: 2}}}, 1, 1, false},
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 2, Index: 2, Commit: 3, Entries: []pb.Entry{{Index: 3, Term: 2}, {Index: 4, Term: 2}}}, 4, 3, false},
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 2, Index: 2, Commit: 4, Entries: []pb.Entry{{Index: 3, Term: 2}}}, 3, 3, false},
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 1, Index: 1, Commit: 4, Entries: []pb.Entry{{Index: 2, Term: 2}}}, 2, 2, false},
// Ensure 3
{pb.Message{Type: pb.MsgApp, Term: 1, LogTerm: 1, Index: 1, Commit: 3}, 2, 1, false}, // match entry 1, commit up to last new entry 1
{pb.Message{Type: pb.MsgApp, Term: 1, LogTerm: 1, Index: 1, Commit: 3, Entries: []pb.Entry{{Index: 2, Term: 2}}}, 2, 2, false}, // match entry 1, commit up to last new entry 2
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 2, Index: 2, Commit: 3}, 2, 2, false}, // match entry 2, commit up to last new entry 2
{pb.Message{Type: pb.MsgApp, Term: 2, LogTerm: 2, Index: 2, Commit: 4}, 2, 2, false}, // commit up to log.last()
}
for i, tt := range tests {
storage := NewMemoryStorage()
storage.Append([]pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}})
sm := newTestRaft(1, []uint64{1}, 10, 1, storage)
sm.becomeFollower(2, None)
sm.handleAppendEntries(tt.m)
if sm.raftLog.lastIndex() != tt.wIndex {
t.Errorf("#%d: lastIndex = %d, want %d", i, sm.raftLog.lastIndex(), tt.wIndex)
}
if sm.raftLog.committed != tt.wCommit {
t.Errorf("#%d: committed = %d, want %d", i, sm.raftLog.committed, tt.wCommit)
}
m := sm.readMessages()
if len(m) != 1 {
t.Fatalf("#%d: msg = nil, want 1", i)
}
if m[0].Reject != tt.wReject {
t.Errorf("#%d: reject = %v, want %v", i, m[0].Reject, tt.wReject)
}
}
}
// TestHandleHeartbeat ensures that the follower commits to the commit in the message.
func TestHandleHeartbeat(t *testing.T) {
commit := uint64(2)
tests := []struct {
m pb.Message
wCommit uint64
}{
{pb.Message{From: 2, To: 1, Type: pb.MsgHeartbeat, Term: 2, Commit: commit + 1}, commit + 1},
{pb.Message{From: 2, To: 1, Type: pb.MsgHeartbeat, Term: 2, Commit: commit - 1}, commit}, // do not decrease commit
}
for i, tt := range tests {
storage := NewMemoryStorage()
storage.Append([]pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}, {Index: 3, Term: 3}})
sm := newTestRaft(1, []uint64{1, 2}, 5, 1, storage)
sm.becomeFollower(2, 2)
sm.raftLog.commitTo(commit)
sm.handleHeartbeat(tt.m)
if sm.raftLog.committed != tt.wCommit {
t.Errorf("#%d: committed = %d, want %d", i, sm.raftLog.committed, tt.wCommit)
}
m := sm.readMessages()
if len(m) != 1 {
t.Fatalf("#%d: msg = nil, want 1", i)
}
if m[0].Type != pb.MsgHeartbeatResp {
t.Errorf("#%d: type = %v, want MsgHeartbeatResp", i, m[0].Type)
}
}
}
// TestHandleHeartbeatResp ensures that we re-send log entries when we get a heartbeat response.
func TestHandleHeartbeatResp(t *testing.T) {
storage := NewMemoryStorage()
storage.Append([]pb.Entry{{Index: 1, Term: 1}, {Index: 2, Term: 2}, {Index: 3, Term: 3}})
sm := newTestRaft(1, []uint64{1, 2}, 5, 1, storage)
sm.becomeCandidate()
sm.becomeLeader()
sm.raftLog.commitTo(sm.raftLog.lastIndex())
// A heartbeat response from a node that is behind; re-send MsgApp
sm.Step(pb.Message{From: 2, Type: pb.MsgHeartbeatResp})
msgs := sm.readMessages()
if len(msgs) != 1 {
t.Fatalf("len(msgs) = %d, want 1", len(msgs))
}
if msgs[0].Type != pb.MsgApp {
t.Errorf("type = %v, want MsgApp", msgs[0].Type)
}
// A second heartbeat response with no AppResp does not re-send because we are in the wait state.
sm.Step(pb.Message{From: 2, Type: pb.MsgHeartbeatResp})
msgs = sm.readMessages()
if len(msgs) != 0 {
t.Fatalf("len(msgs) = %d, want 0", len(msgs))
}
// Send a heartbeat to reset the wait state; next heartbeat will re-send MsgApp.
sm.bcastHeartbeat()
sm.Step(pb.Message{From: 2, Type: pb.MsgHeartbeatResp})
msgs = sm.readMessages()
if len(msgs) != 2 {
t.Fatalf("len(msgs) = %d, want 2", len(msgs))
}
if msgs[0].Type != pb.MsgHeartbeat {
t.Errorf("type = %v, want MsgHeartbeat", msgs[0].Type)
}
if msgs[1].Type != pb.MsgApp {
t.Errorf("type = %v, want MsgApp", msgs[1].Type)
}
// Once we have an MsgAppResp, heartbeats no longer send MsgApp.
sm.Step(pb.Message{
From: 2,
Type: pb.MsgAppResp,
Index: msgs[1].Index + uint64(len(msgs[1].Entries)),
})
// Consume the message sent in response to MsgAppResp
sm.readMessages()
sm.bcastHeartbeat() // reset wait state
sm.Step(pb.Message{From: 2, Type: pb.MsgHeartbeatResp})
msgs = sm.readMessages()
if len(msgs) != 1 {
t.Fatalf("len(msgs) = %d, want 1: %+v", len(msgs), msgs)
}
if msgs[0].Type != pb.MsgHeartbeat {
t.Errorf("type = %v, want MsgHeartbeat", msgs[0].Type)
}
}
// TestMsgAppRespWaitReset verifies the resume behavior of a leader
// MsgAppResp.
func TestMsgAppRespWaitReset(t *testing.T) {
sm := newTestRaft(1, []uint64{1, 2, 3}, 5, 1, NewMemoryStorage())
sm.becomeCandidate()
sm.becomeLeader()
// The new leader has just emitted a new Term 4 entry; consume those messages
// from the outgoing queue.
sm.bcastAppend()
sm.readMessages()
// Node 2 acks the first entry, making it committed.
sm.Step(pb.Message{
From: 2,
Type: pb.MsgAppResp,
Index: 1,
})
if sm.raftLog.committed != 1 {
t.Fatalf("expected committed to be 1, got %d", sm.raftLog.committed)
}
// Also consume the MsgApp messages that update Commit on the followers.
sm.readMessages()
// A new command is now proposed on node 1.
sm.Step(pb.Message{
From: 1,
Type: pb.MsgProp,
Entries: []pb.Entry{{}},
})
// The command is broadcast to all nodes not in the wait state.
// Node 2 left the wait state due to its MsgAppResp, but node 3 is still waiting.
msgs := sm.readMessages()
if len(msgs) != 1 {
t.Fatalf("expected 1 message, got %d: %+v", len(msgs), msgs)
}
if msgs[0].Type != pb.MsgApp || msgs[0].To != 2 {
t.Errorf("expected MsgApp to node 2, got %v to %d", msgs[0].Type, msgs[0].To)
}
if len(msgs[0].Entries) != 1 || msgs[0].Entries[0].Index != 2 {