ZooKeeper的配置文件zoo.cfg內容如下：
# 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=D:\\zookeeper-3.4.14\\data
# the port at which the clients will connect
clientPort=2181
# 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
tickTime=2000：通信心跳數，ZooKeeper服務器與客戶端心跳時間，ZooKeeper使用的基本時間，服務器之間或客戶端與服務器之間維持心跳的時間間隔，也就是每個tickTime時間就會發送一個心跳，時間單位爲毫秒。它用於心跳機制，並且設置最小的session超時時間爲兩倍心跳時間。（session的最小超時時間是2*tickTime）。initLimit=10：Leader和Follower之間的初始通信時限，集羣中的Follower服務器與Leader服務器之間的初始連接時能容忍的最大心跳數（tickTime的數量），用它來限定集羣中的ZooKeeper服務器連接到Leader的時限。syncLimit=5：Leader和Follower之間的同步通信時限，集羣中Leader與Follower之間的最大響應時間單位，如果響應時間超過syncLimit * tickTime，Leader認爲Follower掛掉，從服務器列表中刪除Follower。dataDir=D:\\zookeeper-3.4.14\\data：數據文件目錄 + 數據持久化的路徑，主要用於保存ZooKeeper中的數據。默認是dataDir=/tmp/zookeeperclientPort=2181：客戶端連接端口，監聽客戶端連接的端口。- 其他參數後續補充。。。