基于 Docker 环境搭建 Zookeeper 集群
目录
1. 准备容器
可以考虑从宿主机挂载配置文件，否则可能出现步骤 5 提到的问题
PS C:\Users\xiaozy37528> docker run -itd --name zk1 -p 2181:2181 zookeeper 267eb9df388861236e8c7ed23cca9c0d14ae5e4ce3e29a3e3b90a67dfe28968c PS C:\Users\xiaozy37528> docker run -itd --name zk2 -p 2182:2181 zookeeper 92a97efd42f0296437089ce1de24e99496fa5f6fa75fb9e3509caaa29f65e8cf PS C:\Users\xiaozy37528> docker run -itd --name zk3 -p 2183:2181 zookeeper fa80266ae8931ac09f8b666989cf1579bc716b9991ef066e803e3b1435cccb73
2. 准备局域网
准备一个 Docker 局域网：
PS C:\Users\xiaozy37528> docker network --help Usage: docker network COMMAND Manage networks Commands: connect Connect a container to a network create Create a network disconnect Disconnect a container from a network inspect Display detailed information on one or more networks ls List networks prune Remove all unused networks rm Remove one or more networks Run 'docker network COMMAND --help' for more information on a command.
PS C:\Users\xiaozy37528> docker network create zk_cluster b3a567eeca5a635df46607fa1b8d8cb38bb6472a058cd730a3ebdc625951b660
3. 将容器加入局域网
将 3个 Zookeeper 容器加入局域网：
PS C:\Users\xiaozy37528> docker network connect zk_cluster zk1 PS C:\Users\xiaozy37528> docker network connect zk_cluster zk2 PS C:\Users\xiaozy37528> docker network connect zk_cluster zk3
4. 确保容器能否相互 ping 通
可能出现：ping: command not found
解决方案：
apt-get update
apt-get install iputils-ping
确保 3个 容器能否相互 ping 通：
5. 修改 zoo.cfg 配置文件
容器中可能没有安装 vi 以及 vim，可以使用 apt-get 进行安装，但是由于众所周时的原因，apt-get 可能会很慢，虽然可以更换国内数据源，但是还是很麻烦，所以最省事的办法是创建容器的时候从宿主机挂载配置文件。
Zookeeper 默认使用 3个 端口：
- 2181：用于服务器和客户端间的通信
- 2888：用于服务器间的通信
- 3888：用于服务器间选举Leader
zoo.cfg 配置文件所在的位置：/conf
在配置文件中以下列格式添加集群配置信息：
server.A=B:C:D # A：服务器编号 # B：服务器IP # C：服务器间通信的端口 # D：服务器间选举Leader的端口
6. 设置 myid
根据服务器编号和服务器IP的对应关系配置 myid：
vim /data/myid
7. 启动集群
启动 zk1：会出现警告：“zk1 无法根据配置连接 zk2、zk3”，这是正常的，因为 zk2 和 zk3 还没有启动
启动zk2：会出现警告：“zk2 无法根据配置连接 zk3”，这是正常的，zk3 还没有启动
启动zk3：zk3 没有出现警告信息，因为它需要连接的 zk1、zk2 都已经启动。
zk1、zk2、zk3 全部启动后，Leader 的选举正式开始：
zk1输出信息：
15 03:13:35,560 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:2, n.state:LOOKING, n.leader:2, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:35,561 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:1, n.state:LOOKING, n.leader:2, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:35,762 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@901] - Peer state changed: following 2022-02-15 03:13:35,763 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1512] - FOLLOWING 2022-02-15 03:13:35,767 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@127] - leaderConnectDelayDuringRetryMs: 100 2022-02-15 03:13:35,767 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@128] - TCP NoDelay set to: true 2022-02-15 03:13:35,768 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@129] - learner.asyncSending = false 2022-02-15 03:13:35,768 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@130] - learner.closeSocketAsync = false 2022-02-15 03:13:35,769 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):BlueThrottle@141] - Weighed connection throttling is disabled 2022-02-15 03:13:35,770 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1300] - minSessionTimeout set to 4000 2022-02-15 03:13:35,770 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1309] - maxSessionTimeout set to 40000 2022-02-15 03:13:35,771 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ResponseCache@45] - getData response cache size is initialized with value 400. 2022-02-15 03:13:35,771 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ResponseCache@45] - getChildren response cache size is initialized with value 400. 2022-02-15 03:13:35,772 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@109] - zookeeper.pathStats.slotCapacity = 60 2022-02-15 03:13:35,773 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@110] - zookeeper.pathStats.slotDuration = 15 2022-02-15 03:13:35,773 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@111] - zookeeper.pathStats.maxDepth = 6 2022-02-15 03:13:35,773 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@112] - zookeeper.pathStats.initialDelay = 5 2022-02-15 03:13:35,773 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@113] - zookeeper.pathStats.delay = 5 2022-02-15 03:13:35,773 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@114] - zookeeper.pathStats.enabled = false 2022-02-15 03:13:35,775 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1536] - The max bytes for all large requests are set to 104857600 2022-02-15 03:13:35,775 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1550] - The large request threshold is set to -1 2022-02-15 03:13:35,775 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):AuthenticationHelper@66] - zookeeper.enforce.auth.enabled = false 2022-02-15 03:13:35,775 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):AuthenticationHelper@67] - zookeeper.enforce.auth.schemes = [] 2022-02-15 03:13:35,776 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@361] - Created server with tickTime 2000 minSessionTimeout 4000 maxSessionTimeout 40000 clientPortListenBacklog -1 datadir /datalog/version-2 snapdir /data/version-2 2022-02-15 03:13:35,776 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Follower@77] - FOLLOWING - LEADER ELECTION TOOK - 14487 MS 2022-02-15 03:13:35,779 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: following - discovery 2022-02-15 03:13:35,783 [myid:1] - INFO [LeaderConnector-/172.20.0.3:2888:Learner$LeaderConnector@381] - Successfully connected to leader, using address: /172.20.0.3:2888 2022-02-15 03:13:35,808 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: following - synchronization 2022-02-15 03:13:35,817 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@562] - Getting a diff from the leader 0x0 2022-02-15 03:13:35,818 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@920] - Peer state changed: following - synchronization - diff 2022-02-15 03:13:35,821 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@734] - Learner received NEWLEADER message 2022-02-15 03:13:35,821 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1867] - Dynamic reconfig is disabled, we don't store the last seen config. 2022-02-15 03:13:35,824 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@920] - Peer state changed: following - synchronization 2022-02-15 03:13:35,828 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):CommitProcessor@491] - Configuring CommitProcessor with readBatchSize -1 commitBatchSize 1 2022-02-15 03:13:35,828 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):CommitProcessor@452] - Configuring CommitProcessor with 8 worker threads. 2022-02-15 03:13:35,829 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):FollowerRequestProcessor@59] - Initialized FollowerRequestProcessor with zookeeper.follower.skipLearnerRequestToNextProcessor as false 2022-02-15 03:13:35,830 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):RequestThrottler@75] - zookeeper.request_throttler.shutdownTimeout = 10000 2022-02-15 03:13:35,856 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):Learner@718] - Learner received UPTODATE message 2022-02-15 03:13:35,856 [myid:1] - INFO [QuorumPeer[myid=1](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: following - broadcast 2022-02-15 03:13:36,986 [myid:1] - INFO [ListenerHandler-/172.20.0.2:3888:QuorumCnxManager$Listener$ListenerHandler@1071] - Received connection request from /172.20.0.4:53704 2022-02-15 03:13:36,987 [myid:1] - INFO [QuorumConnectionThread-[myid=1]-3:QuorumCnxManager@514] - Have smaller server identifier, so dropping the connection: (myId:1 --> sid:3) 2022-02-15 03:13:36,997 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:FOLLOWING; n.sid:3, n.state:LOOKING, n.leader:3, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0
zk2输出信息：
15 03:13:35,554 [myid:2] - INFO [WorkerReceiver[myid=2]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:2, n.state:LOOKING, n.leader:2, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:35,560 [myid:2] - INFO [WorkerReceiver[myid=2]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:1, n.state:LOOKING, n.leader:1, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:35,562 [myid:2] - INFO [WorkerReceiver[myid=2]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:1, n.state:LOOKING, n.leader:2, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:35,763 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@901] - Peer state changed: leading 2022-02-15 03:13:35,763 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1524] - LEADING 2022-02-15 03:13:35,768 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):LearnerMaster@47] - zookeeper.leader.maxConcurrentSnapSyncs = 10 2022-02-15 03:13:35,768 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):LearnerMaster@50] - zookeeper.leader.maxConcurrentDiffSyncs = 100 2022-02-15 03:13:35,768 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):Leader@87] - TCP NoDelay set to: true 2022-02-15 03:13:35,768 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):Leader@108] - zookeeper.leader.ackLoggingFrequency = 1000 2022-02-15 03:13:35,769 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):Leader@1345] - zookeeper.leader.maxTimeToWaitForEpoch = -1ms 2022-02-15 03:13:35,771 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):BlueThrottle@141] - Weighed connection throttling is disabled 2022-02-15 03:13:35,771 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1300] - minSessionTimeout set to 4000 2022-02-15 03:13:35,772 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1309] - maxSessionTimeout set to 40000 2022-02-15 03:13:35,773 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ResponseCache@45] - getData response cache size is initialized with value 400. 2022-02-15 03:13:35,773 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ResponseCache@45] - getChildren response cache size is initialized with value 400. 2022-02-15 03:13:35,774 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@109] - zookeeper.pathStats.slotCapacity = 60 2022-02-15 03:13:35,774 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@110] - zookeeper.pathStats.slotDuration = 15 2022-02-15 03:13:35,774 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@111] - zookeeper.pathStats.maxDepth = 6 2022-02-15 03:13:35,774 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@112] - zookeeper.pathStats.initialDelay = 5 2022-02-15 03:13:35,774 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@113] - zookeeper.pathStats.delay = 5 2022-02-15 03:13:35,774 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@114] - zookeeper.pathStats.enabled = false 2022-02-15 03:13:35,776 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1536] - The max bytes for all large requests are set to 104857600 2022-02-15 03:13:35,776 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1550] - The large request threshold is set to -1 2022-02-15 03:13:35,777 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):AuthenticationHelper@66] - zookeeper.enforce.auth.enabled = false 2022-02-15 03:13:35,777 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):AuthenticationHelper@67] - zookeeper.enforce.auth.schemes = [] 2022-02-15 03:13:35,777 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@361] - Created server with tickTime 2000 minSessionTimeout 4000 maxSessionTimeout 40000 clientPortListenBacklog -1 datadir /datalog/version-2 snapdir /data/version-2 2022-02-15 03:13:35,779 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):Leader@584] - LEADING - LEADER ELECTION TOOK - 231 MS 2022-02-15 03:13:35,783 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: leading - discovery 2022-02-15 03:13:35,784 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):FileTxnSnapLog@479] - Snapshotting: 0x0 to /data/version-2/snapshot.0 2022-02-15 03:13:35,788 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@543] - Snapshot taken in 4 ms 2022-02-15 03:13:35,793 [myid:2] - INFO [LearnerCnxAcceptorHandler-/172.20.0.3:2888:LearnerHandler@72] - leader.closeSocketAsync = false 2022-02-15 03:13:35,797 [myid:2] - INFO [LearnerHandler-/172.20.0.2:40466:LearnerHandler@506] - Follower sid: 1 : info : 172.20.0.2:2888:3888:participant 2022-02-15 03:13:35,803 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1867] - Dynamic reconfig is disabled, we don't store the last seen config. 2022-02-15 03:13:35,807 [myid:2] - INFO [LearnerHandler-/172.20.0.2:40466:ZKDatabase@346] - On disk txn sync enabled with snapshotSizeFactor 0.33 2022-02-15 03:13:35,807 [myid:2] - INFO [LearnerHandler-/172.20.0.2:40466:LearnerHandler@801] - Synchronizing with Learner sid: 1 maxCommittedLog=0x0 minCommittedLog=0x0 lastProcessedZxid=0x0 peerLastZxid=0x0 2022-02-15 03:13:35,808 [myid:2] - INFO [LearnerHandler-/172.20.0.2:40466:LearnerHandler@846] - Sending DIFF zxid=0x0 for peer sid: 1 2022-02-15 03:13:35,818 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: leading - synchronization 2022-02-15 03:13:35,837 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):Leader@1495] - Have quorum of supporters, sids: [[1, 2]]; starting up and setting last processed zxid: 0x100000000 2022-02-15 03:13:35,837 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):Leader@1517] - Dynamic reconfig feature is disabled, skip designatedLeader calculation and reconfig processing. 2022-02-15 03:13:35,841 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):CommitProcessor@491] - Configuring CommitProcessor with readBatchSize -1 commitBatchSize 1 2022-02-15 03:13:35,842 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):CommitProcessor@452] - Configuring CommitProcessor with 8 worker threads. 2022-02-15 03:13:35,843 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ProposalRequestProcessor@57] - zookeeper.forward_learner_requests_to_commit_processor_disabled = false 2022-02-15 03:13:35,847 [myid:2] - INFO [ProcessThread(sid:2 cport:-1)::PrepRequestProcessor@137] - PrepRequestProcessor (sid:2) started, reconfigEnabled=false 2022-02-15 03:13:35,848 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):ContainerManager@84] - Using checkIntervalMs=60000 maxPerMinute=10000 maxNeverUsedIntervalMs=0 2022-02-15 03:13:35,848 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):RequestThrottler@75] - zookeeper.request_throttler.shutdownTimeout = 10000 2022-02-15 03:13:35,856 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: leading - broadcast 2022-02-15 03:13:36,572 [myid:2] - WARN [QuorumConnectionThread-[myid=2]-2:QuorumCnxManager@401] - Cannot open channel to 3 at election address /172.20.0.4:3888 java.net.ConnectException: Connection refused (Connection refused) at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) at java.base/java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.base/java.net.SocksSocketImpl.connect(Unknown Source) at java.base/java.net.Socket.connect(Unknown Source) at org.apache.zookeeper.server.quorum.QuorumCnxManager.initiateConnection(QuorumCnxManager.java:384) at org.apache.zookeeper.server.quorum.QuorumCnxManager$QuorumConnectionReqThread.run(QuorumCnxManager.java:458) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source) 2022-02-15 03:13:36,986 [myid:2] - INFO [ListenerHandler-/172.20.0.3:3888:QuorumCnxManager$Listener$ListenerHandler@1071] - Received connection request from /172.20.0.4:35560 2022-02-15 03:13:36,997 [myid:2] - INFO [WorkerReceiver[myid=2]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LEADING; n.sid:3, n.state:LOOKING, n.leader:3, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:37,025 [myid:2] - INFO [LearnerHandler-/172.20.0.4:37970:LearnerHandler@506] - Follower sid: 3 : info : 172.20.0.4:2888:3888:participant 2022-02-15 03:13:37,031 [myid:2] - INFO [LearnerHandler-/172.20.0.4:37970:ZKDatabase@346] - On disk txn sync enabled with snapshotSizeFactor 0.33 2022-02-15 03:13:37,031 [myid:2] - INFO [LearnerHandler-/172.20.0.4:37970:LearnerHandler@801] - Synchronizing with Learner sid: 3 maxCommittedLog=0x0 minCommittedLog=0x0 lastProcessedZxid=0x100000000 peerLastZxid=0x0 2022-02-15 03:13:37,033 [myid:2] - INFO [LearnerHandler-/172.20.0.4:37970:LearnerHandler@568] - Sending snapshot last zxid of peer is 0x0, zxid of leader is 0x100000000, send zxid of db as 0x100000000, 1 concurrent snapshot sync, snapshot sync was exempt from throttle
zk3输出信息：
2022-02-15 03:13:36,986 [myid:3] - INFO [WorkerReceiver[myid=3]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:3, n.state:LOOKING, n.leader:3, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:36,986 [myid:3] - INFO [ListenerHandler-/172.20.0.4:3888:QuorumCnxManager$Listener$ListenerHandler@1071] - Received connection request from /172.20.0.2:33656 2022-02-15 03:13:36,997 [myid:3] - INFO [WorkerReceiver[myid=3]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:1, n.state:LOOKING, n.leader:2, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:36,998 [myid:3] - INFO [WorkerReceiver[myid=3]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:2, n.state:LOOKING, n.leader:2, n.round:0x1, n.peerEpoch:0x0, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:36,999 [myid:3] - INFO [WorkerReceiver[myid=3]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:1, n.state:FOLLOWING, n.leader:2, n.round:0x1, n.peerEpoch:0x1, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:36,999 [myid:3] - INFO [WorkerReceiver[myid=3]:FastLeaderElection$Messenger$WorkerReceiver@390] - Notification: my state:LOOKING; n.sid:2, n.state:LEADING, n.leader:2, n.round:0x1, n.peerEpoch:0x1, n.zxid:0x0, message format version:0x2, n.config version:0x0 2022-02-15 03:13:36,999 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@901] - Peer state changed: following 2022-02-15 03:13:37,000 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1512] - FOLLOWING 2022-02-15 03:13:37,004 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@127] - leaderConnectDelayDuringRetryMs: 100 2022-02-15 03:13:37,004 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@128] - TCP NoDelay set to: true 2022-02-15 03:13:37,004 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@129] - learner.asyncSending = false 2022-02-15 03:13:37,004 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@130] - learner.closeSocketAsync = false 2022-02-15 03:13:37,006 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):BlueThrottle@141] - Weighed connection throttling is disabled 2022-02-15 03:13:37,008 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1300] - minSessionTimeout set to 4000 2022-02-15 03:13:37,009 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1309] - maxSessionTimeout set to 40000 2022-02-15 03:13:37,010 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ResponseCache@45] - getData response cache size is initialized with value 400. 2022-02-15 03:13:37,010 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ResponseCache@45] - getChildren response cache size is initialized with value 400. 2022-02-15 03:13:37,012 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@109] - zookeeper.pathStats.slotCapacity = 60 2022-02-15 03:13:37,012 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@110] - zookeeper.pathStats.slotDuration = 15 2022-02-15 03:13:37,012 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@111] - zookeeper.pathStats.maxDepth = 6 2022-02-15 03:13:37,012 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@112] - zookeeper.pathStats.initialDelay = 5 2022-02-15 03:13:37,012 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@113] - zookeeper.pathStats.delay = 5 2022-02-15 03:13:37,013 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestPathMetricsCollector@114] - zookeeper.pathStats.enabled = false 2022-02-15 03:13:37,014 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1536] - The max bytes for all large requests are set to 104857600 2022-02-15 03:13:37,014 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@1550] - The large request threshold is set to -1 2022-02-15 03:13:37,015 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):AuthenticationHelper@66] - zookeeper.enforce.auth.enabled = false 2022-02-15 03:13:37,015 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):AuthenticationHelper@67] - zookeeper.enforce.auth.schemes = [] 2022-02-15 03:13:37,015 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@361] - Created server with tickTime 2000 minSessionTimeout 4000 maxSessionTimeout 40000 clientPortListenBacklog -1 datadir /datalog/version-2 snapdir /data/version-2 2022-02-15 03:13:37,015 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Follower@77] - FOLLOWING - LEADER ELECTION TOOK - 38 MS 2022-02-15 03:13:37,017 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: following - discovery 2022-02-15 03:13:37,021 [myid:3] - INFO [LeaderConnector-/172.20.0.3:2888:Learner$LeaderConnector@381] - Successfully connected to leader, using address: /172.20.0.3:2888 2022-02-15 03:13:37,032 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: following - synchronization 2022-02-15 03:13:37,033 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@920] - Peer state changed: following - synchronization - snap 2022-02-15 03:13:37,033 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@573] - Getting a snapshot from leader 0x100000000 2022-02-15 03:13:37,033 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):WatchManagerFactory@42] - Using org.apache.zookeeper.server.watch.WatchManager as watch manager 2022-02-15 03:13:37,033 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):WatchManagerFactory@42] - Using org.apache.zookeeper.server.watch.WatchManager as watch manager 2022-02-15 03:13:37,036 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@734] - Learner received NEWLEADER message 2022-02-15 03:13:37,037 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1867] - Dynamic reconfig is disabled, we don't store the last seen config. 2022-02-15 03:13:37,037 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):FileTxnSnapLog@479] - Snapshotting: 0x100000000 to /data/version-2/snapshot.100000000 2022-02-15 03:13:37,043 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):ZooKeeperServer@543] - Snapshot taken in 6 ms 2022-02-15 03:13:37,046 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@920] - Peer state changed: following - synchronization 2022-02-15 03:13:37,057 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):CommitProcessor@491] - Configuring CommitProcessor with readBatchSize -1 commitBatchSize 1 2022-02-15 03:13:37,057 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):CommitProcessor@452] - Configuring CommitProcessor with 8 worker threads. 2022-02-15 03:13:37,059 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):FollowerRequestProcessor@59] - Initialized FollowerRequestProcessor with zookeeper.follower.skipLearnerRequestToNextProcessor as false 2022-02-15 03:13:37,061 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):RequestThrottler@75] - zookeeper.request_throttler.shutdownTimeout = 10000 2022-02-15 03:13:37,068 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):Learner@718] - Learner received UPTODATE message 2022-02-15 03:13:37,068 [myid:3] - INFO [QuorumPeer[myid=3](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@915] - Peer state changed: following - broadcast
最终 zk2 被选为 Leader。
8. 测试
集群中的 Zookeeper 服务器会相互同步数据，试着向 zk2 添加一条数据，然后从 zk3 查出同步过来的数据。
操作前：
在 zk2 添加数据，在 zk3 查询数据：
地势坤，君子以厚德载物。
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2020-02-15 HotSpot虚拟机对象创建