zookeeper快照清理

从3.4版本以后，在配置文件中有2个参数分别设置快照的清理。默认没有打开。

autopurge.purgeInterval=1 这个参数指定了清理频率，单位是小时，需要填写一个1或更大的整数，默认是0，表示不开启自己清理功能

autopurge.snapRetainCount=3  这个参数和上面的参数搭配使用，这个参数指定了需要保留的文件数目。默认是保留3个。

还有一种方法，系统提供了zkCleanup.sh脚本，执行该脚本也可以手工清理。

# 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