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如何学习raft分布式一致性算法

这篇文章主要讲解了“如何学习raft分布式一致性算法”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“如何学习raft分布式一致性算法”吧！

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raft分布式一致性算法

分布式存储系统通常会通过维护多个副本来进行容错，
以提高系统的可用性。
这就引出了分布式存储系统的核心问题——如何保证多个副本的一致性？

Raft算法把问题分解成了四个子问题：
1. 领袖选举（leader election）、
2. 日志复制（log replication）、
3. 安全性（safety）
4. 成员关系变化（membership changes）
这几个子问题。

源码gitee地址：
https://gitee.com/ioly/learning.gooop

原文链接：
https://my.oschina.net/ioly/blog/5011356

目标

  • 根据raft协议，实现高可用分布式强一致的kv存储

子目标（Day 12）

  • 终于可以“点火”了，来到这里不容易 _

    • 添加大量诊断日志

    • 修复若干细节问题

  • 编写单元测试代码：

    • 启动多个raft节点

    • 检测Leader选举是否成功

    • 向节点1写入若干数据

    • 向节点2写入若干数据

    • 在节点3读取数据

    • kill掉当前Leader节点，观察重新选举是否成功

单元测试

tRaftKVServer_test.go，在本地启动四个raft节点进行功能性测试

package server

import (
	"learning/gooop/etcd/raft/debug"
	"learning/gooop/etcd/raft/logger"
	"learning/gooop/etcd/raft/rpc"
	"testing"
	"time"
	nrpc "net/rpc"
)

func Test_RaftKVServer(t *testing.T) {
	fnAssertTrue := func(b bool, msg string) {
		if !b {
			t.Fatal(msg)
		}
	}

	logger.Exclude("RaftRPCServer.Ping")
	logger.Exclude("RaftRPCServer.Heartbeat")
	logger.Exclude("feLeaderHeartbeat")
	logger.Exclude(").Heartbeat")

	// start node 1 to 3
	_ = new(tRaftKVServer).BeginServeTCP("./node-01")
	_ = new(tRaftKVServer).BeginServeTCP("./node-02")
	_ = new(tRaftKVServer).BeginServeTCP("./node-03")
	_ = new(tRaftKVServer).BeginServeTCP("./node-04")

	// wait for up
	time.Sleep(1 * time.Second)
	// tRaftLSMImplement(node-01,1).HandleStateChanged, state=2
	fnAssertTrue(logger.Count("HandleStateChanged, state=3") == 1, "expecting leader node")
	t.Logf("passing electing, leader=%v", debug.LeaderNodeID)

	// put into node-1
	c1,_ := nrpc.Dial("tcp", "localhost:3331")
	defer c1.Close()
	kcmd := new(rpc.KVCmd)
	kcmd.OPCode = rpc.KVPut
	kcmd.Key = []byte("key-01")
	kcmd.Content = []byte("content 01")
	kret := new(rpc.KVRet)
	err := c1.Call("KVStoreRPCServer.ExecuteKVCmd", kcmd, kret)
	fnAssertTrue(err == nil && kret.Code == rpc.KVOk, "expecting KVOk")
	t.Log("passing put into node-01")

	// put into node-2
	c2,_ := nrpc.Dial("tcp", "localhost:3332")
	defer c2.Close()
	kcmd.Key = []byte("key-02")
	kcmd.Content = []byte("content 02")
	err = c2.Call("KVStoreRPCServer.ExecuteKVCmd", kcmd, kret)
	fnAssertTrue(err == nil && kret.Code == rpc.KVOk, "expecting KVOk")
	t.Log("passing put into node-02")

	// get from node-3
	c3,_ := nrpc.Dial("tcp", "localhost:3333")
	defer c3.Close()
	kcmd.OPCode = rpc.KVGet
	kcmd.Key = []byte("key-02")
	kcmd.Content = nil
	kret.Content = nil
	kret.Key = nil
	err = c3.Call("KVStoreRPCServer.ExecuteKVCmd", kcmd, kret)
	fnAssertTrue(err == nil && kret.Code == rpc.KVOk, "expecting KVOk")
	fnAssertTrue(kret.Content != nil && string(kret.Content) == "content 02", "expecting content 02")
	t.Log("passing get from node-04")

	// kill leader node
	debug.KilledNodeID = debug.LeaderNodeID
	time.Sleep(2 * time.Second)
	fnAssertTrue(logger.Count("HandleStateChanged, state=3") == 2, "expecting reelecting leader node")
	t.Logf("passing reelecting, leader=%v", debug.LeaderNodeID)

	time.Sleep(2 * time.Second)
}

测试输出

可以观察到5个passing，测试ok，重新选举的时延也在预期范围内，约700ms

API server listening at: [::]:46709
=== RUN   Test_RaftKVServer
16:51:09.329792609 tRaftKVServer.BeginServeTCP, starting node-01, port=3331
16:51:09.329864584 tBrokenState(from=node-01, to=node-01@localhost:3331).whenStartThenBeginDial
16:51:09.329888978 tBrokenState(from=node-01, to=node-02@localhost:3332).whenStartThenBeginDial
16:51:09.329903778 tBrokenState(from=node-01, to=node-03@localhost:3333).whenStartThenBeginDial
16:51:09.329912231 tBrokenState(from=node-01, to=node-04@localhost:3334).whenStartThenBeginDial
16:51:09.329920585 tFollowerState(node-01).init
16:51:09.329926372 tFollowerState(node-01).initEventHandlers
16:51:09.329941794 tFollowerState(node-01).Start
16:51:09.330218761 tRaftKVServer.BeginServeTCP, service ready at port=3331
16:51:09.330549519 tFollowerState(node-01).whenStartThenBeginWatchLeaderTimeout, begin
16:51:09.333852427 tRaftKVServer.BeginServeTCP, starting node-02, port=3332
16:51:09.333893483 tBrokenState(from=node-02, to=node-01@localhost:3331).whenStartThenBeginDial
16:51:09.333925018 tBrokenState(from=node-02, to=node-02@localhost:3332).whenStartThenBeginDial
16:51:09.333955573 tBrokenState(from=node-02, to=node-03@localhost:3333).whenStartThenBeginDial
16:51:09.33397762 tBrokenState(from=node-02, to=node-04@localhost:3334).whenStartThenBeginDial
16:51:09.333990318 tFollowerState(node-02).init
16:51:09.333997643 tFollowerState(node-02).initEventHandlers
16:51:09.334015293 tFollowerState(node-02).Start
16:51:09.334089713 tRaftKVServer.BeginServeTCP, service ready at port=3332
16:51:09.334290701 tFollowerState(node-02).whenStartThenBeginWatchLeaderTimeout, begin
16:51:09.337803901 tRaftKVServer.BeginServeTCP, starting node-03, port=3333
16:51:09.337842816 tBrokenState(from=node-03, to=node-01@localhost:3331).whenStartThenBeginDial
16:51:09.337866444 tBrokenState(from=node-03, to=node-02@localhost:3332).whenStartThenBeginDial
16:51:09.337880481 tBrokenState(from=node-03, to=node-03@localhost:3333).whenStartThenBeginDial
16:51:09.337893773 tBrokenState(from=node-03, to=node-04@localhost:3334).whenStartThenBeginDial
16:51:09.337905184 tFollowerState(node-03).init
16:51:09.337912795 tFollowerState(node-03).initEventHandlers
16:51:09.337945677 tFollowerState(node-03).Start
16:51:09.338027861 tRaftKVServer.BeginServeTCP, service ready at port=3333
16:51:09.338089164 tFollowerState(node-03).whenStartThenBeginWatchLeaderTimeout, begin
16:51:09.341594205 tRaftKVServer.BeginServeTCP, starting node-04, port=3334
16:51:09.34163547 tBrokenState(from=node-04, to=node-01@localhost:3331).whenStartThenBeginDial
16:51:09.341679869 tBrokenState(from=node-04, to=node-02@localhost:3332).whenStartThenBeginDial
16:51:09.341694419 tBrokenState(from=node-04, to=node-03@localhost:3333).whenStartThenBeginDial
16:51:09.3417269 tBrokenState(from=node-04, to=node-04@localhost:3334).whenStartThenBeginDial
16:51:09.341741739 tFollowerState(node-04).init
16:51:09.341770267 tFollowerState(node-04).initEventHandlers
16:51:09.341793763 tFollowerState(node-04).Start
16:51:09.34213956 tRaftKVServer.BeginServeTCP, service ready at port=3334
16:51:09.342361058 tFollowerState(node-04).whenStartThenBeginWatchLeaderTimeout, begin
16:51:09.481747744 tBrokenState(from=node-01, to=node-04@localhost:3334).whenDialOKThenSetConn
16:51:09.481770012 tBrokenState(from=node-01, to=node-01@localhost:3331).whenDialOKThenSetConn
16:51:09.481771692 tBrokenState(from=node-01, to=node-04@localhost:3334).whenDialOKThenSwitchToConnectedState
16:51:09.481791046 tBrokenState(from=node-01, to=node-04@localhost:3334).beDisposing
16:51:09.481781787 tBrokenState(from=node-01, to=node-01@localhost:3331).whenDialOKThenSwitchToConnectedState
16:51:09.481807689 tBrokenState(from=node-01, to=node-01@localhost:3331).beDisposing
16:51:09.481747893 tBrokenState(from=node-01, to=node-02@localhost:3332).whenDialOKThenSetConn
16:51:09.481933708 tBrokenState(from=node-01, to=node-02@localhost:3332).whenDialOKThenSwitchToConnectedState
16:51:09.481955515 tBrokenState(from=node-01, to=node-02@localhost:3332).beDisposing
16:51:09.481747742 tBrokenState(from=node-01, to=node-03@localhost:3333).whenDialOKThenSetConn
16:51:09.481973577 tBrokenState(from=node-01, to=node-03@localhost:3333).whenDialOKThenSwitchToConnectedState
16:51:09.481980127 tBrokenState(from=node-01, to=node-03@localhost:3333).beDisposing
16:51:09.485403927 tBrokenState(from=node-02, to=node-01@localhost:3331).whenDialOKThenSetConn
16:51:09.485692968 tBrokenState(from=node-02, to=node-01@localhost:3331).whenDialOKThenSwitchToConnectedState
16:51:09.485707781 tBrokenState(from=node-02, to=node-01@localhost:3331).beDisposing
16:51:09.485462572 tBrokenState(from=node-02, to=node-02@localhost:3332).whenDialOKThenSetConn
16:51:09.485520127 tBrokenState(from=node-02, to=node-03@localhost:3333).whenDialOKThenSetConn
16:51:09.485723854 tBrokenState(from=node-02, to=node-02@localhost:3332).whenDialOKThenSwitchToConnectedState
16:51:09.485733962 tBrokenState(from=node-02, to=node-02@localhost:3332).beDisposing
16:51:09.485733667 tBrokenState(from=node-02, to=node-03@localhost:3333).whenDialOKThenSwitchToConnectedState
16:51:09.485749968 tBrokenState(from=node-02, to=node-03@localhost:3333).beDisposing
16:51:09.485474638 tBrokenState(from=node-02, to=node-04@localhost:3334).whenDialOKThenSetConn
16:51:09.485780798 tBrokenState(from=node-02, to=node-04@localhost:3334).whenDialOKThenSwitchToConnectedState
16:51:09.485787997 tBrokenState(from=node-02, to=node-04@localhost:3334).beDisposing
16:51:09.489019463 tBrokenState(from=node-03, to=node-02@localhost:3332).whenDialOKThenSetConn
16:51:09.489141518 tBrokenState(from=node-03, to=node-02@localhost:3332).whenDialOKThenSwitchToConnectedState
16:51:09.489165663 tBrokenState(from=node-03, to=node-02@localhost:3332).beDisposing
16:51:09.489021724 tBrokenState(from=node-03, to=node-03@localhost:3333).whenDialOKThenSetConn
16:51:09.489191277 tBrokenState(from=node-03, to=node-03@localhost:3333).whenDialOKThenSwitchToConnectedState
16:51:09.489199495 tBrokenState(from=node-03, to=node-03@localhost:3333).beDisposing
16:51:09.489021727 tBrokenState(from=node-03, to=node-04@localhost:3334).whenDialOKThenSetConn
16:51:09.489019621 tBrokenState(from=node-03, to=node-01@localhost:3331).whenDialOKThenSetConn
16:51:09.489217044 tBrokenState(from=node-03, to=node-04@localhost:3334).whenDialOKThenSwitchToConnectedState
16:51:09.489222223 tBrokenState(from=node-03, to=node-01@localhost:3331).whenDialOKThenSwitchToConnectedState
16:51:09.489234054 tBrokenState(from=node-03, to=node-01@localhost:3331).beDisposing
16:51:09.489225544 tBrokenState(from=node-03, to=node-04@localhost:3334).beDisposing
16:51:09.492701804 tBrokenState(from=node-04, to=node-01@localhost:3331).whenDialOKThenSetConn
16:51:09.492720605 tBrokenState(from=node-04, to=node-01@localhost:3331).whenDialOKThenSwitchToConnectedState
16:51:09.492728029 tBrokenState(from=node-04, to=node-01@localhost:3331).beDisposing
16:51:09.492702391 tBrokenState(from=node-04, to=node-02@localhost:3332).whenDialOKThenSetConn
16:51:09.492764 tBrokenState(from=node-04, to=node-02@localhost:3332).whenDialOKThenSwitchToConnectedState
16:51:09.492771402 tBrokenState(from=node-04, to=node-02@localhost:3332).beDisposing
16:51:09.492778635 tBrokenState(from=node-04, to=node-04@localhost:3334).whenDialOKThenSetConn
16:51:09.492791174 tBrokenState(from=node-04, to=node-04@localhost:3334).whenDialOKThenSwitchToConnectedState
16:51:09.492799699 tBrokenState(from=node-04, to=node-04@localhost:3334).beDisposing
16:51:09.492844734 tBrokenState(from=node-04, to=node-03@localhost:3333).whenDialOKThenSetConn
16:51:09.492855638 tBrokenState(from=node-04, to=node-03@localhost:3333).whenDialOKThenSwitchToConnectedState
16:51:09.492863777 tBrokenState(from=node-04, to=node-03@localhost:3333).beDisposing
16:51:10.238765817 tFollowerState(node-01).whenLeaderHeartbeatTimeoutThenSwitchToCandidateState, term=0
16:51:10.238808459 tFollowerState(node-01).feDisposing, disposed=true
16:51:10.238885964 tRaftLSMImplement(node-01,1).HandleStateChanged, state=2
16:51:10.238892892 tRaftLSMImplement(node-01,1).meStateChanged, 2
16:51:10.238897706 tCandidateState(node-01).whenStartThenAskForVote
16:51:10.238902038 tCandidateState(node-01).ceAskingForVote, term=1
16:51:10.238907133 tCandidateState(node-01).ceAskingForVote, vote to myself
16:51:10.2389139 tCandidateState(node-01).ceAskingForVote, ticketCount=1
16:51:10.238920737 tCandidateState(node-01).whenAskingForVoteThenWatchElectionTimeout
16:51:10.239208777 tFollowerState(node-04).feCandidateRequestVote, reset last vote
16:51:10.239233375 tFollowerState(node-04).feVoteToCandidate, candidate=node-01, term=1
16:51:10.239261011 tFollowerState(node-02).feCandidateRequestVote, reset last vote
16:51:10.239273156 tFollowerState(node-02).feVoteToCandidate, candidate=node-01, term=1
16:51:10.239288823 tRaftLSMImplement(node-04,1).RequestVote, cmd=&{node-01 1 0 0}, ret=&{0 1}, err=
16:51:10.239303552 RaftRPCServer.RequestVote, cmd=&{node-01 1 0 0}, ret=&{0 1}, e=
16:51:10.239343533 tRaftLSMImplement(node-02,1).RequestVote, cmd=&{node-01 1 0 0}, ret=&{0 1}, err=
16:51:10.239390716 tFollowerState(node-03).feCandidateRequestVote, reset last vote
16:51:10.239431327 tFollowerState(node-03).feVoteToCandidate, candidate=node-01, term=1
16:51:10.239442927 tCandidateState(node-01).handleRequestVoteOK, peer=node-04, term=1
16:51:10.239455262 tCandidateState(node-01).ceReceiveTicket, mTicketCount=2
16:51:10.239463079 tCandidateState(node-01).whenReceiveTicketThenCheckTicketCount
16:51:10.239473836 tRaftLSMImplement(node-03,1).RequestVote, cmd=&{node-01 1 0 0}, ret=&{0 1}, err=
16:51:10.239488078 RaftRPCServer.RequestVote, cmd=&{node-01 1 0 0}, ret=&{0 1}, e=
16:51:10.239412948 RaftRPCServer.RequestVote, cmd=&{node-01 1 0 0}, ret=&{0 1}, e=
16:51:10.239578689 tCandidateState(node-01).handleRequestVoteOK, peer=node-03, term=1
16:51:10.239593183 tCandidateState(node-01).ceReceiveTicket, mTicketCount=3
16:51:10.239601334 tCandidateState(node-01).whenReceiveTicketThenCheckTicketCount
16:51:10.239629478 tCandidateState(node-01).whenWinningTheVoteThenSwitchToLeader
16:51:10.239639823 tCandidateState(node-01).ceDisposing, mTicketCount=0
16:51:10.239696198 tCandidateState(node-01).ceDisposing, mDisposedFlag=true
16:51:10.239752502 tRaftLSMImplement(node-01,2).HandleStateChanged, state=3
16:51:10.239764172 tRaftLSMImplement(node-01,2).meStateChanged, 3
    tRaftKVServer_test.go:34: passing electing, leader=node-01
16:51:10.366875446 tRaftLSMImplement(node-02,1).AppendLog, cmd=&{node-01 1 0xc0004961c0}, ret=&{0 1 0 0}, err=
16:51:10.366931566 RaftRPCServer.AppendLog, cmd=&{node-01 1 0xc0004961c0}, ret=&{0 1 0 0}, e=
16:51:10.370788589 tRaftLSMImplement(node-03,1).AppendLog, cmd=&{node-01 1 0xc00043c5c0}, ret=&{0 1 0 0}, err=
16:51:10.370829944 RaftRPCServer.AppendLog, cmd=&{node-01 1 0xc00043c5c0}, ret=&{0 1 0 0}, e=
16:51:10.374865684 tRaftLSMImplement(node-04,1).AppendLog, cmd=&{node-01 1 0xc000496580}, ret=&{0 1 0 0}, err=
16:51:10.374904568 RaftRPCServer.AppendLog, cmd=&{node-01 1 0xc000496580}, ret=&{0 1 0 0}, e=
16:51:10.375163435 tRaftLSMImplement(node-02,1).CommitLog, cmd=&{node-01 1 1}, ret=&{1}, err=
16:51:10.375176692 RaftRPCServer.CommitLog, cmd=&{node-01 1 1}, ret=&{1}, e=
16:51:10.375444843 tRaftLSMImplement(node-03,1).CommitLog, cmd=&{node-01 1 1}, ret=&{1}, err=
16:51:10.375512284 RaftRPCServer.CommitLog, cmd=&{node-01 1 1}, ret=&{1}, e=
16:51:10.375797446 tRaftLSMImplement(node-04,1).CommitLog, cmd=&{node-01 1 1}, ret=&{1}, err=
16:51:10.375859612 RaftRPCServer.CommitLog, cmd=&{node-01 1 1}, ret=&{1}, e=
16:51:10.379551174 tRaftLSMImplement(node-01,3).ExecuteKVCmd, cmd=&{1 [107 101 121 45 48 49] [99 111 110 116 101 110 116 32 48 49]}, ret=&{0 [] []}, err=
16:51:10.379577233 KVStoreRPCServer.ExecuteKVCmd, cmd=&{1 [107 101 121 45 48 49] [99 111 110 116 101 110 116 32 48 49]}, ret=&{0 [] []}, e=
    tRaftKVServer_test.go:46: passing put into node-01
16:51:10.387761245 tRaftLSMImplement(node-02,1).AppendLog, cmd=&{node-01 1 0xc000496d80}, ret=&{0 1 0 0}, err=
16:51:10.387777654 RaftRPCServer.AppendLog, cmd=&{node-01 1 0xc000496d80}, ret=&{0 1 0 0}, e=
16:51:10.391348874 tRaftLSMImplement(node-03,1).AppendLog, cmd=&{node-01 1 0xc000496e40}, ret=&{0 1 0 0}, err=
16:51:10.391387707 RaftRPCServer.AppendLog, cmd=&{node-01 1 0xc000496e40}, ret=&{0 1 0 0}, e=
16:51:10.395137344 tRaftLSMImplement(node-04,1).AppendLog, cmd=&{node-01 1 0xc000496f00}, ret=&{0 1 0 0}, err=
16:51:10.395155304 RaftRPCServer.AppendLog, cmd=&{node-01 1 0xc000496f00}, ret=&{0 1 0 0}, e=
16:51:10.395343688 tRaftLSMImplement(node-02,1).CommitLog, cmd=&{node-01 1 1}, ret=&{1}, err=
16:51:10.395357145 RaftRPCServer.CommitLog, cmd=&{node-01 1 1}, ret=&{1}, e=
16:51:10.395495604 tRaftLSMImplement(node-03,1).CommitLog, cmd=&{node-01 1 1}, ret=&{1}, err=
16:51:10.3955081 RaftRPCServer.CommitLog, cmd=&{node-01 1 1}, ret=&{1}, e=
16:51:10.395667457 tRaftLSMImplement(node-04,1).CommitLog, cmd=&{node-01 1 1}, ret=&{1}, err=
16:51:10.395688067 RaftRPCServer.CommitLog, cmd=&{node-01 1 1}, ret=&{1}, e=
16:51:10.399174064 tRaftLSMImplement(node-01,3).ExecuteKVCmd, cmd=&{1 [107 101 121 45 48 50] [99 111 110 116 101 110 116 32 48 50]}, ret=&{0 [] []}, err=
16:51:10.399217896 KVStoreRPCServer.ExecuteKVCmd, cmd=&{1 [107 101 121 45 48 50] [99 111 110 116 101 110 116 32 48 50]}, ret=&{0 [] []}, e=
16:51:10.399373787 tRaftLSMImplement(node-02,1).ExecuteKVCmd, cmd=&{1 [107 101 121 45 48 50] [99 111 110 116 101 110 116 32 48 50]}, ret=&{0 [] []}, err=
16:51:10.399397275 KVStoreRPCServer.ExecuteKVCmd, cmd=&{1 [107 101 121 45 48 50] [99 111 110 116 101 110 116 32 48 50]}, ret=&{0 [] []}, e=
    tRaftKVServer_test.go:55: passing put into node-02
16:51:10.400256236 tRaftLSMImplement(node-01,3).ExecuteKVCmd, cmd=&{0 [107 101 121 45 48 50] []}, ret=&{0 [] [99 111 110 116 101 110 116 32 48 50]}, err=
16:51:10.400298117 KVStoreRPCServer.ExecuteKVCmd, cmd=&{0 [107 101 121 45 48 50] []}, ret=&{0 [] [99 111 110 116 101 110 116 32 48 50]}, e=
16:51:10.400639059 tRaftLSMImplement(node-03,1).ExecuteKVCmd, cmd=&{0 [107 101 121 45 48 50] []}, ret=&{0 [] [99 111 110 116 101 110 116 32 48 50]}, err=
16:51:10.400663438 KVStoreRPCServer.ExecuteKVCmd, cmd=&{0 [107 101 121 45 48 50] []}, ret=&{0 [] [99 111 110 116 101 110 116 32 48 50]}, e=
    tRaftKVServer_test.go:68: passing get from node-04
16:51:10.431051964 tRaftKVServer.whenStartThenWatchDebugKill, killing node-01
2021/04/07 16:51:10 rpc.Serve: accept:accept tcp [::]:3331: use of closed network connection
16:51:11.19072568 tFollowerState(node-02).whenLeaderHeartbeatTimeoutThenSwitchToCandidateState, term=1
16:51:11.190755031 tFollowerState(node-02).feDisposing, disposed=true
16:51:11.190856259 tRaftLSMImplement(node-02,1).HandleStateChanged, state=2
16:51:11.190885201 tRaftLSMImplement(node-02,1).meStateChanged, 2
16:51:11.190898966 tCandidateState(node-02).whenStartThenAskForVote
16:51:11.190908485 tCandidateState(node-02).ceAskingForVote, term=2
16:51:11.1909172 tCandidateState(node-02).ceAskingForVote, vote to myself
16:51:11.19093098 tCandidateState(node-02).ceAskingForVote, ticketCount=1
16:51:11.190944035 tCandidateState(node-02).whenAskingForVoteThenWatchElectionTimeout
16:51:11.191694746 tFollowerState(node-03).feVoteToCandidate, candidate=node-02, term=2
16:51:11.191724769 tRaftLSMImplement(node-01,3).RequestVote, cmd=&{node-02 2 0 0}, ret=&{0 0}, err=
16:51:11.192305012 RaftRPCServer.RequestVote, cmd=&{node-02 2 0 0}, ret=&{0 0}, e=
16:51:11.192223342 tFollowerState(node-04).feCandidateRequestVote, reset last vote
16:51:11.192464666 tFollowerState(node-04).feVoteToCandidate, candidate=node-02, term=2
16:51:11.19253627 tRaftLSMImplement(node-04,1).RequestVote, cmd=&{node-02 2 0 0}, ret=&{0 2}, err=
16:51:11.192208542 tRaftLSMImplement(node-03,1).RequestVote, cmd=&{node-02 2 0 0}, ret=&{0 2}, err=
16:51:11.192613581 tCandidateState(node-02).handleRequestVoteOK, peer=node-01, term=2
16:51:11.192627483 tCandidateState(node-02).ceReceiveTicket, mTicketCount=2
16:51:11.192634994 tCandidateState(node-02).whenReceiveTicketThenCheckTicketCount
16:51:11.19260158 RaftRPCServer.RequestVote, cmd=&{node-02 2 0 0}, ret=&{0 2}, e=
16:51:11.192764937 tCandidateState(node-02).handleRequestVoteOK, peer=node-03, term=2
16:51:11.192778197 tCandidateState(node-02).ceReceiveTicket, mTicketCount=3
16:51:11.192784986 tCandidateState(node-02).whenReceiveTicketThenCheckTicketCount
16:51:11.192806525 tCandidateState(node-02).whenWinningTheVoteThenSwitchToLeader
16:51:11.192815315 tCandidateState(node-02).ceDisposing, mTicketCount=0
16:51:11.192836837 tCandidateState(node-02).ceDisposing, mDisposedFlag=true
16:51:11.192853274 tRaftLSMImplement(node-02,2).HandleStateChanged, state=3
16:51:11.192863098 tRaftLSMImplement(node-02,2).meStateChanged, 3
16:51:11.193007386 tFollowerState(node-01).init
16:51:11.193017792 tFollowerState(node-01).initEventHandlers
16:51:11.193037127 tRaftLSMImplement(node-01,3).HandleStateChanged, state=1
16:51:11.193046674 tRaftLSMImplement(node-01,3).meStateChanged, 1
16:51:11.193053504 tFollowerState(node-01).Start
16:51:11.19313721 tFollowerState(node-01).whenStartThenBeginWatchLeaderTimeout, begin
16:51:11.192549822 RaftRPCServer.RequestVote, cmd=&{node-02 2 0 0}, ret=&{0 2}, e=
    tRaftKVServer_test.go:74: passing reelecting, leader=node-02
--- PASS: Test_RaftKVServer (5.09s)
PASS

Debugger finished with exit code 0

debug.go

支持单元测试的上下文变量

package debug

// KilledNodeID was used to detect whether a node should stop wroking, written by unit test code
var KilledNodeID = ""

// LeaderNodeID presents current leader node's ID, written by lsm/tLeaderState
var LeaderNodeID = ""

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