zookeeper快照清理

從3.4版本以后，在配置文件中有2個參數分別設置快照的清理。默認沒有打開。

autopurge.purgeInterval=1 這個參數指定了清理頻率，單位是小時，需要填寫一個1或更大的整數，默認是0，表示不開啟自己清理功能

autopurge.snapRetainCount=3 這個參數和上面的參數搭配使用，這個參數指定了需要保留的文件數目。默認是保留3個。

還有一種方法，系統提供了zkCleanup.sh腳本，執行該腳本也可以手工清理。

# 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=/data/zookeeper/zkdata
dataLogDir=/data/zookeeper/zkdatalog 

# the port at which the clients will connect
clientPort=2181

#171102
server.1=10.15.201.83:2888:3888
server.2=10.15.201.84:2888:3888
server.3=10.15.201.85:2888:3888

# 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