zookeeper集羣擴容和收縮

服務器信息

zookeeper版本 3.4.6

jdk版本 1.7.0_80

10.100.0.29 zk1
10.100.0.44 zk2
10.100.0.45 zk3
10.100.0.46 zk4
10.100.0.47 zk5

##zookeeper擴容（3 -> 5）

1. 3節點的配置並檢查狀態

配置：

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/data/app/zookeeper
clientPort=2181
server.1=10.100.0.29:2888:3888
server.2=10.100.0.44:2888:3888
server.3=10.100.0.45:2888:3888

zk1狀態：

Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
 /127.0.0.1:36078[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x0
Mode: follower
Node count: 4

zk2狀態：

Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
 /127.0.0.1:46938[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x100000000
Mode: leader
Node count: 4

zk3狀態：

Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
 /127.0.0.1:37306[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x100000000
Mode: follower
Node count: 4

建立znode查看集羣是否同步

2.加入zookeeper 4，5節點

配置以下：

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/data/app/zookeeper
clientPort=2181
server.1=10.100.0.29:2888:3888
server.2=10.100.0.44:2888:3888
server.3=10.100.0.45:2888:3888
server.4=10.100.0.46:2888:3888
server.5=10.100.0.47:2888:3888

3. 啓動4，5節點，測試寫入數據

zk4：

[zk: localhost:2181(CONNECTED) 0] get /test/test1
"test1"
cZxid = 0x10000000a
ctime = Sun Jun 05 08:51:09 CST 2016
mZxid = 0x10000000a
mtime = Sun Jun 05 08:51:09 CST 2016
pZxid = 0x10000000a
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
[zk: localhost:2181(CONNECTED) 1] create /test/test2 'test2'
Created /test/test2

zk1:

[zk: localhost:2181(CONNECTED) 0] get /test/test2
'test2'
cZxid = 0x100000015
ctime = Sun Jun 05 08:58:24 CST 2016
mZxid = 0x100000015
mtime = Sun Jun 05 08:58:24 CST 2016
pZxid = 0x100000015
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0

4. 修改zk1，2，3配置，依次重啓，添加節點完成

##集羣收縮（5-3）

修改保留節點的配置後依次重啓，重啓完成後依次關閉2個不須要的節點便可。