zookeeper 从入门到放弃(02)

之前有探究如何启动多个zookeeper，但如果不形成集群的话，意义不大，那么zookeeper 集群如何搭建呢？

create zookeeper server folder

复制多个 zookeepr folder

我这里拷贝了3个，但实际上为了简化过程我只使用了2个

set config

server1 config

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=../zkData
dataLogDir=../zkData/log
# the port at which the clients will connect
clientPort=2183
# the maximum number of client connections.
# increase this if you need to handle more clients
maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
autopurge.purgeInterval=1
reconfigEnabled=true
#server.1=127.0.0.1:2081:2780:2783:participant;2791
server.1=127.0.0.1:2887:3887
server.2=127.0.0.1:2888:3888
#server.3=127.0.0.1:2889:3889
admin.serverPort=8081

server1 config

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=../zkData
dataLogDir=../zkData/log
# the port at which the clients will connect
clientPort=2182
# the maximum number of client connections.
# increase this if you need to handle more clients
maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
autopurge.purgeInterval=1
reconfigEnabled=true
#server.1=127.0.0.1:2081:2780:2783:participant;2791
server.1=127.0.0.1:2887:3887
server.2=127.0.0.1:2888:3888
#server.3=127.0.0.1:2889:3889
admin.serverPort=8082

run servers

zkServer 分别启动两个 server

test

ok，没有啥问题

有意思的是，当我关掉一台 server 时，分别连接 2 个 server 的 client 都出现了异常

那么集群的高可用性、健壮性是如何体现的呢？

当我启动3台server时，如果我关闭其中1台，那么，对应的3个client，只有连接关闭那台server的client受到了影响，这是因为 zk server 具有fast fail特性，当挂掉的 server 数量不超过 server 总量的 1/2 时，不影响其提供服务

参考资料： win10环境下搭建zookeeper伪集群