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Zookeeper

  1. 节点信息

  2. 持久节点

  3. 临时节点（client session）

  4. 序列节点

    reate -s /node1
/node10000000001

  5. 节点存储数据（1MB）

  6. 角色

    Leader Follower 才能选举 Observer

  7. 信息

    cZxid =0X200000002  全局事务id  0X2 第几届leader
mZxid =0X200000003  修改事务id   
连接信息也会消耗 全局事务id

  8. 安装

wget https://downloads.apache.org/zookeeper/zookeeper-3.7.0/apache-zookeeper-3.7.0-bin.tar.gz

export ZOO_HOME=/opt/apache-zookeeper-3.7.0-bin
export PATH=$PATH:${ZOO_HOME}/bin
source /etc/profile

#修改zoo.cfg
server.x=IP地址:接受数据:选主投票
server.1=localhost:2287:3387
server.2=localhost:2288:3388
server.3=localhost:2289:3389
server.4=localhost:2290:3390:observer
dataDir=/opt/zoo/data/node1

echo 1 >/opt/zoo/data/node1/myid
echo 2 >/opt/zoo/data/node2/myid
echo 3 >/opt/zoo/data/node3/myid

zkServer.sh status /opt/zoo/config/zoo1.cfg
zkServer.sh status /opt/zoo/config/zoo2.cfg
zkServer.sh status /opt/zoo/config/zoo3.cfg

  1. 协议

  2. paxos

  3. ZAB

    zxid 最新

    myid 最大

  4. watch

    create delete change children

  5. 分布式锁

lock0000000001
lock0000000002  watch  lock0000000001
lock0000000003  watch  lock0000000002
lock0000000004  watch  lock0000000003
lock0000000005  watch  lock0000000004