ZK的基本使用

3888端口，用于leader選舉的端口

命令行使用

創(chuàng)建

create [-s | -e ] path data acl

其中 -s 表示順序節(jié)點，

-e 表示 臨時節(jié)點

不加的話，默認是持久化節(jié)點

acl是權限，默認不加權限限制

sh $ZK_HOME/bin/zkCli.sh

[zk: localhost:2181(CONNECTED) 0] create /zk-jsy-book 122jin
Created /zk-jsy-book

通過執(zhí)行以上命令，可以在根目錄下創(chuàng)建一個 zk-jsy-book的節(jié)點，其值是 122jin

讀取

ls path

類似于linux下的ls命令，可以列舉出path下所有的一級子節(jié)點

[zk: localhost:2181(CONNECTED) 2] ls /
[zk-jsy-book, zookeeper]
[zk: localhost:2181(CONNECTED) 3] ls /zk-jsy-book
[]

get path

可以獲取某個節(jié)點的值及其對應屬性

[zk: localhost:2181(CONNECTED) 5] create /zk-jsy-book/book1 111  --- 再創(chuàng)建一個子節(jié)點
Created /zk-jsy-book/book1
[zk: localhost:2181(CONNECTED) 6] ls /zk-jsy-book    --- ls查看
[book1]
[zk: localhost:2181(CONNECTED) 7] get /zk-jsy-book   --- get獲取節(jié)點值及屬性信息
122jin
cZxid = 0x2d
ctime = Tue Jul 24 12:47:37 GMT 2018
mZxid = 0x2d
mtime = Tue Jul 24 12:47:37 GMT 2018
pZxid = 0x2e
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 1
[zk: localhost:2181(CONNECTED) 8] get /zk-jsy-book/book1  --- 獲取子節(jié)點值及屬性信息
111
cZxid = 0x2e
ctime = Tue Jul 24 13:21:01 GMT 2018
mZxid = 0x2e
mtime = Tue Jul 24 13:21:01 GMT 2018
pZxid = 0x2e
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 0

更新

set path data [version]

[zk: localhost:2181(CONNECTED) 9] set /zk-jsy-book test
cZxid = 0x2d
ctime = Tue Jul 24 12:47:37 GMT 2018
mZxid = 0x2f
mtime = Tue Jul 24 13:39:13 GMT 2018
pZxid = 0x2e
cversion = 1
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 1
[zk: localhost:2181(CONNECTED) 10] get /zk-jsy-book
test
cZxid = 0x2d
ctime = Tue Jul 24 12:47:37 GMT 2018
mZxid = 0x2f
mtime = Tue Jul 24 13:39:13 GMT 2018
pZxid = 0x2e
cversion = 1
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 1
[zk: localhost:2181(CONNECTED) 11]

可以看到，dataVersion變成了1

刪除

delete path

[zk: localhost:2181(CONNECTED) 11] ls /
[zk-jsy-book, zookeeper]
[zk: localhost:2181(CONNECTED) 12] delete /zk-jsy-book
Node not empty: /zk-jsy-book
[zk: localhost:2181(CONNECTED) 13] delete /zk-jsy-book/book1
[zk: localhost:2181(CONNECTED) 14] get /zk-jsy-book/book1
Node does not exist: /zk-jsy-book/book1
[zk: localhost:2181(CONNECTED) 15] delete /zk-jsy-book
[zk: localhost:2181(CONNECTED) 16] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 17]

注意，無法刪除一個有子節(jié)點的節(jié)點，如上所示。