一.功能简述
Apache ZooKeeper是一种用于分布式应用程序的分布式开源协调服务；提供了命名服务、配置管理、集群管理、分布式锁、队列管理等一系列的功能
Ⅰ).角色功能
ZooKeeper主要包括leader、learner和client三大类角色，其中learner又分为follower和observer
功能描述
a).leader
负责进行投票的发起和决议，更新系统状态
b).learner
1).follower
用于接受客户端请求并想客户端返回结果，在选主过程中参与投票
2).observer
可以接受客户端连接，将写请求转发给leader，但observer不参加投票过程，只同步leader的状态，observer的目的是为了扩展系统，提高读取速度
c).client
请求发起方
Ⅱ).数据模型和分层命名空间
ZooKeeper提供的namespace非常类似于标准文件系统。名称是由斜杠（/）分隔的路径元素序列。ZooKeeper名称空间中的每个节点都由路径标识
- 层次化的目录结构，命名符合常规文件系统规范
- 每一个zookeeper节点一个znode,并且具有一个唯一的路径标识
- 节点Znode可以包含数据和子节点，但是EPHEMERAL类型的节点不能有子节点
- Znode中的数据可以有多个版本，查询需要带版本号
- 客户端应用可以在节点上设置监视器
- ZK节点只支持一次性完整读写
Ⅲ).Znode类型
Znode的类型在创建时确定并且之后不能再修改
持久znode不依赖于客户端会话，只有当客户端明确要删除该持久znode时才会被删除
短暂znode的客户端会话结束时，zookeeper会将该短暂znode删除，短暂znode不可以有子节点
- PERSISTENT: 持久的
- EPHEMERAL: 暂时的
- PERSISTENT_SEQUENTIAL: 持久化顺序编号目录节点
- EPHEMERAL_SEQUENTIAL: 暂时化顺序编号目录节点
二.安装部署
Ⅰ).下载
zookeeper-3.4.14
zookeeper-3.5.5
Ⅱ).配置
a).tickTime
CS通信心跳时间，单位是毫秒，系统默认是2000毫秒
客户端与服务器或者服务器与服务器之间维持心跳，也就是每个tickTime时间就会发送一次心跳。通过心跳不仅能够用来监听机器的工作状态，还可以通过心跳来控制Flower跟Leader的通信时间，默认情况下FL的会话时常是心跳间隔的两倍
b).initLimit
集群中的follower服务器(F)与leader服务器(L)之间初始连接时能容忍的最多心跳数（tickTime的数量）
c).syncLimit
集群中flower服务器（F）跟leader（L）服务器之间的请求和答应最多能容忍的心跳数
d).dataDir
存放myid信息跟一些版本，日志，跟服务器唯一的ID信息等
e).clientPort
客户端连接zookeeper服务器的端口，默认是2181
## 查看端口情况
netstat -tanf).集群信息的配置
配置集群信息是存在一定的格式：service.N =YYY:A:B
- N：代表服务器编号（也就是myid里面的值）
- YYY：服务器地址
- A：表示 Flower 跟 Leader的通信端口，简称服务端内部通信的端口（默认2888）
- B：表示 是选举端口（默认是3888）
# 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.
dataDir=/home/bigdata/zookeeper-3.4.14/data
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
#maxClientCnxns=60
# 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
# 集群信息的配置
server.1=hostname1:2888:3888
server.2=hostname2:2888:3888
server.3=hostname3:2888:3888Ⅲ).安装
a).解压
tar -zxvf zookeeper-3.4.14.tar.gzb).修改配置
默认集群模式配置
1).修改存储路径
dataDir=/home/bigdata/zookeeper-3.4.14/data2).修改myid
## 分别在每个节点的dataDir配置目录中，创建myid
vi myid
## 内容，代表服务器编号
13).增加集群配置
## 集群信息的配置
server.1=hostname1:2888:3888
server.2=hostname2:2888:3888
server.3=hostname3:2888:3888c).启停服务
## 启动服务
./bin/zkServer.sh start ./conf/zoo.cfg
## 停止服务
./bin/zkServer.sh stop ./conf/zoo.cfg三.常用命令
Ⅰ).查看状态
## 命令
./bin/zkServer.sh status
## 结果
## 可查看ZK工作模式，使用的配置文件等信息
ZooKeeper JMX enabled by default
Using config: /home/bigdata/zookeeper-3.4.14/bin/../conf/zoo.cfg
Mode: standaloneⅡ).客户端连接Zookeeper
./bin/zkCli.shⅢ).ls 查看
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1] ls /zookeeper
[quota]
[zk: localhost:2181(CONNECTED) 2]Ⅳ).get 获取节点数据和更新信息
- cZxid: 创建节点的id
- ctime: 节点的创建时间
- mZxid: 修改节点的id
- mtime: 修改节点的时间
- pZxid: 子节点的id
- cversion: 子节点的版本
- dataVersion: 当前节点数据的版本
- aclVersion: 权限的版本
- ephemeralOwner: 是否是临时节点标识
- dataLength: 数据的长度
- numChildren: 子节点的数量
[zk: localhost:2181(CONNECTED) 2] get /zookeeper
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1Ⅴ).stat 获得节点的更新信息
[zk: localhost:2181(CONNECTED) 4] stat /zookeeper
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1Ⅵ).ls2 查看
ls2是ls命令和stat命令的整合
[zk: localhost:2181(CONNECTED) 5] ls2 /zookeeper
[quota]
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1Ⅶ).create 创建节点
命令：create [-s] [-e] path data acl
- [-s]： 创建顺序节点，自动累加
- [-e]： 创建临时节点
## 创建dremio节点
[zk: localhost:2181(CONNECTED) 6] create /dremio dremio_data
Created /dremio
## 获得dremio节点内容
[zk: localhost:2181(CONNECTED) 7] get /dremio
dremio_data
cZxid = 0x2
ctime = Thu Aug 22 23:15:59 CST 2019
mZxid = 0x2
mtime = Thu Aug 22 23:15:59 CST 2019
pZxid = 0x2
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 11
numChildren = 0Ⅷ).set 修改节点
命令： set path data [version]
1).数据修改
## 修改dremio节点数据
[zk: localhost:2181(CONNECTED) 8] set /dremio dremio_data_update
cZxid = 0x2
ctime = Thu Aug 22 23:15:59 CST 2019
mZxid = 0x3
mtime = Thu Aug 22 23:19:58 CST 2019
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 18
numChildren = 0
## 获得dremio节点内容
[zk: localhost:2181(CONNECTED) 9] get /dremio
dremio_data_update
cZxid = 0x2
ctime = Thu Aug 22 23:15:59 CST 2019
mZxid = 0x3
mtime = Thu Aug 22 23:19:58 CST 2019
pZxid = 0x2
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 18
numChildren = 02).根据版本号修改
## 获得dremio节点内容，此时dataVersion = 2
[zk: localhost:2181(CONNECTED) 11] get /dremio
dremio_data_update
cZxid = 0x2
ctime = Thu Aug 22 23:15:59 CST 2019
mZxid = 0x4
mtime = Thu Aug 22 23:22:08 CST 2019
pZxid = 0x2
cversion = 0
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 18
numChildren = 0
## 根据版本号更新dataVersion乐观锁
### 数据的版本号已经修改为2，再次使用版本号1修改节点提交错误
[zk: localhost:2181(CONNECTED) 12] set /dremio dremio_data_update 1
version No is not valid : /dremio
### 修改版本号为2的数据，版本号更新为3
[zk: localhost:2181(CONNECTED) 13] set /dremio dremio_data_update 2
cZxid = 0x2
ctime = Thu Aug 22 23:15:59 CST 2019
mZxid = 0x6
mtime = Thu Aug 22 23:25:23 CST 2019
pZxid = 0x2
cversion = 0
dataVersion = 3
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 18
numChildren = 0Ⅸ).delete删除节点
命令：delete path [version]
## 根据版本号删除
[zk: localhost:2181(CONNECTED) 14] delete /dremio 3
## 获得dremio节点内容
[zk: localhost:2181(CONNECTED) 15] get /dremio
Node does not exist: /dremioⅩ).watcher通知机制
a).设置watch事件
命令：stat path [watch]
## 设置watch事件
[zk: localhost:2181(CONNECTED) 17] stat /hbase watch
Node does not exist: /hbase
## 触发watcher事件
[zk: localhost:2181(CONNECTED) 18] create /hbase hbase
WATCHER::
WatchedEvent state:SyncConnected type:NodeCreated path:/hbase
Created /hbaseb).查看watch事件
命令：get path [watch]
## 设置watch事件
[zk: localhost:2181(CONNECTED) 19] get /solr watch
Node does not exist: /solr
## 不存在的目录无法触发watcher事件
[zk: localhost:2181(CONNECTED) 20] create /solr solr
Created /solr## 设置watch事件
[zk: localhost:2181(CONNECTED) 22] get /solr watch
solr_data
cZxid = 0xa
ctime = Thu Aug 22 23:34:54 CST 2019
mZxid = 0xb
mtime = Thu Aug 22 23:35:09 CST 2019
pZxid = 0xa
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 9
numChildren = 0
## 触发watcher事件
[zk: localhost:2181(CONNECTED) 23] set /solr solr_data_update
WATCHER::
cZxid = 0xa
WatchedEvent state:SyncConnected type:NodeDataChanged path:/solr
ctime = Thu Aug 22 23:34:54 CST 2019
mZxid = 0xc
mtime = Thu Aug 22 23:37:02 CST 2019
pZxid = 0xa
cversion = 0
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 16
numChildren = 0Ⅺ).ACL权限控制
Zookeeper有5种操作权限：CREATE、READ、WRITE、DELETE、ADMIN，即增、删、改、查、管理权限
赋权方式： [scheme:id:permissions]
scheme4种身份认证
- world：默认方式，相当于全世界都能访问
- auth：代表已经认证通过的用户(cli中可以通过addauth digest user:pwd 来添加当前上下文中的授权用户)
- digest：即用户名:密码这种方式认证，这也是业务系统中最常用的
- ip：使用Ip地址认证
a).获取acl权限信息
命令： getAcl /znode_path
默认: world:cdrwa任何人都可以访问
[zk: localhost:2181(CONNECTED) 24] getAcl /solr
'world,'anyone
: cdrwab).设置权限
命令： setAcl /znode_path [scheme:id:permissions]
## 默认权限
[zk: localhost:2181(CONNECTED) 24] getAcl /solr
'world,'anyone
: cdrwa
## 设置权限
[zk: localhost:2181(CONNECTED) 26] setAcl /solr world:anyone:rwa
cZxid = 0xa
ctime = Thu Aug 22 23:34:54 CST 2019
mZxid = 0xc
mtime = Thu Aug 22 23:37:02 CST 2019
pZxid = 0xa
cversion = 0
dataVersion = 2
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 16
numChildren = 0
## 查看权限
[zk: localhost:2181(CONNECTED) 27] getAcl /solr
'world,'anyone
: rwac).密码明文设置
命令： setAcl /znode_path [scheme:username:password:permissions]
## 创建/hbase/data节点
[zk: localhost:2181(CONNECTED) 28] create /hbase/data hbase_test_data
Created /hbase/data
## 查看默认权限
[zk: localhost:2181(CONNECTED) 29] getAcl /hbase/data
'world,'anyone
: cdrwa
## 使用auth，密码明文设置
[zk: localhost:2181(CONNECTED) 30] setAcl /hbase/data auth:hbase:hbase:cdrwa
Acl is not valid : /hbase/data
## 注册hbase:hbase账号密码
[zk: localhost:2181(CONNECTED) 31] addauth digest hbase:hbase
## 使用auth，密码明文设置
[zk: localhost:2181(CONNECTED) 32] setAcl /hbase/data auth:hbase:hbase:cdrwa
cZxid = 0xe
ctime = Thu Aug 22 23:55:44 CST 2019
mZxid = 0xe
mtime = Thu Aug 22 23:55:44 CST 2019
pZxid = 0xe
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 15
numChildren = 0
## 查看权限，密码为密文格式
[zk: localhost:2181(CONNECTED) 33] getAcl /hbase/data
'digest,'hbase:zJ5u59GFXPgRIx4zWNFCOCbyBOs=
: cdrwad).密码密文设置
命令： setAcl /znode_path [scheme:username:password:permissions]
## 创建/kafka节点
[zk: localhost:2181(CONNECTED) 39] create /kafka kafka
Created /kafka
## 密码密文设置
[zk: localhost:2181(CONNECTED) 40] setAcl /kafka digest:hbase:zJ5u59GFXPgRIx4zWNFCOCbyBOs=:cdrwa
cZxid = 0x13
ctime = Fri Aug 23 00:10:59 CST 2019
mZxid = 0x13
mtime = Fri Aug 23 00:10:59 CST 2019
pZxid = 0x13
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
## 查看权限，密码为密文格式
[zk: localhost:2181(CONNECTED) 41] getAcl /kafka
'digest,'hbase:zJ5u59GFXPgRIx4zWNFCOCbyBOs=
: cdrwae).ip 控制客户端
命令： setAcl /znode_path [ip:hostname:permissions]
## 设置ip控制的权限信息
[zk: localhost:2181(CONNECTED) 44] setAcl /kafka/ip ip:192.168.133.132:cdrwa
cZxid = 0x15
ctime = Fri Aug 23 00:12:58 CST 2019
mZxid = 0x15
mtime = Fri Aug 23 00:12:58 CST 2019
pZxid = 0x15
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 2
numChildren = 0
[zk: localhost:2181(CONNECTED) 45] getAcl /kafka/ip
Authentication is not valid : /kafka/ipf).super 超级管理员
命令如下：
"-Dzookeeper.DigestAuthenticationProvider.superDigest=username:password"
nohup "$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" "-Dzookeeper.DigestAuthenticationprovider.superDigest=username:password" \
-cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" > "$_ZOO_DAEMON_OUT" 2>&1 < /dev/null &备注：使用super权限需要修改zkServer.sh，添加super管理员，重启zkServer.sh
g).注册账号密码
命令： addauth digest username:password
## 注册hbase:hbase账号密码
[zk: localhost:2181(CONNECTED) 31] addauth digest hbase:hbaseⅫ).nc命令查看zookeeper信息
需安装nc： yum install nc
a).查看服务器配置
命令：echo conf|nc hostname 2181
[bigdata@carbondata data]$ echo conf|nc 192.168.133.132 2181
clientPort=2181
dataDir=/home/bigdata/zookeeper-3.4.14/data/version-2
dataLogDir=/home/bigdata/zookeeper-3.4.14/data/version-2
tickTime=2000
maxClientCnxns=60
minSessionTimeout=4000
maxSessionTimeout=40000
serverId=0b).查看状态信息
命令：echo stat|nc hostname 2181
[bigdata@carbondata data]$ echo stat|nc 192.168.133.132 2181
Zookeeper version: 3.4.14-4c25d480e66aadd371de8bd2fd8da255ac140bcf, built on 03/06/2019 16:18 GMT
Clients:
/127.0.0.1:59358[1](queued=0,recved=523,sent=525)
/192.168.133.132:60578[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/17
Received: 526
Sent: 527
Connections: 2
Outstanding: 0
Zxid: 0x16
Mode: standalone
Node count: 10c).查看zookeeper运行状态
命令：echo ruok|nc hostname 2181
[bigdata@carbondata data]$ echo ruok|nc 192.168.133.132 2181
imok
[bigdata@carbondata data]$d).列出临时节点
命令：echo dump|nc hostname 2181
## 未创建临时节点
[bigdata@carbondata data]$ echo dump|nc 192.168.133.132 2181
SessionTracker dump:
Session Sets (3):
0 expire at Thu Jan 01 10:47:54 CST 1970:
0 expire at Thu Jan 01 10:48:04 CST 1970:
1 expire at Thu Jan 01 10:48:14 CST 1970:
0x100002177b70000
ephemeral nodes dump:
Sessions with Ephemerals (0):
## 创建临时节点
[zk: localhost:2181(CONNECTED) 0] create -e /hbase/tmp test
Created /hbase/tmp
## 列出临时节点
[bigdata@carbondata data]$ echo dump|nc 192.168.133.132 2181
SessionTracker dump:
Session Sets (4):
0 expire at Thu Jan 01 10:55:34 CST 1970:
0 expire at Thu Jan 01 10:55:44 CST 1970:
0 expire at Thu Jan 01 10:55:54 CST 1970:
1 expire at Thu Jan 01 10:55:56 CST 1970:
0x100002177b70003
ephemeral nodes dump:
Sessions with Ephemerals (1):
0x100002177b70003:
/hbase/temp
/hbase/tmpe).显示连接到服务端的信息
命令：echo cons|nc hostname 2181
[bigdata@carbondata data]$ echo cons|nc 192.168.133.132 2181
/192.168.133.132:60598[0](queued=0,recved=1,sent=0)
/127.0.0.1:59376[1](queued=0,recved=21,sent=21,sid=0x100002177b70003,lop=PING,est=1566491558846,to=30000,lcxid=0x2,lzxid=0x21,lresp=10575010,llat=0,minlat=0,avglat=0,maxlat=3)
f).显示环境变量信息
命令：echo envi|nc hostname 2181
[bigdata@carbondata data]$ echo envi|nc 192.168.133.132 2181
Environment:
zookeeper.version=3.4.14-4c25d480e66aadd371de8bd2fd8da255ac140bcf, built on 03/06/2019 16:18 GMT
host.name=carbondata
java.version=1.8.0_211
java.vendor=Oracle Corporation
java.home=/usr/java/jdk1.8.0_211-amd64/jre
java.class.path=/home/bigdata/zookeeper-3.4.14/bin/../zookeeper-server/target/classes:/home/bigdata/zookeeper-3.4.14/bin/../build/classes:/home/bigdata/zookeeper-3.4.14/bin/../zookeeper-server/target/lib/*.jar:/home/bigdata/zookeeper-3.4.14/bin/../build/lib/*.jar:/home/bigdata/zookeeper-3.4.14/bin/../lib/slf4j-log4j12-1.7.25.jar:/home/bigdata/zookeeper-3.4.14/bin/../lib/slf4j-api-1.7.25.jar:/home/bigdata/zookeeper-3.4.14/bin/../lib/netty-3.10.6.Final.jar:/home/bigdata/zookeeper-3.4.14/bin/../lib/log4j-1.2.17.jar:/home/bigdata/zookeeper-3.4.14/bin/../lib/jline-0.9.94.jar:/home/bigdata/zookeeper-3.4.14/bin/../lib/audience-annotations-0.5.0.jar:/home/bigdata/zookeeper-3.4.14/bin/../zookeeper-3.4.14.jar:/home/bigdata/zookeeper-3.4.14/bin/../zookeeper-server/src/main/resources/lib/*.jar:/home/bigdata/zookeeper-3.4.14/bin/../conf:.:/usr/java/jdk1.8.0_211-amd64/lib/dt.jar:/usr/java/jdk1.8.0_211-amd64/lib/tools.jar
java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
java.io.tmpdir=/tmp
java.compiler=<NA>
os.name=Linux
os.arch=amd64
os.version=3.10.0-957.el7.x86_64
user.name=bigdata
user.home=/home/bigdata
user.dir=/home/bigdata/zookeeper-3.4.14g).查看zookeeper的健康信息
命令：echo mntr|nc hostname 2181
[bigdata@carbondata data]$ echo mntr|nc 192.168.133.132 2181
zk_version 3.4.14-4c25d480e66aadd371de8bd2fd8da255ac140bcf, built on 03/06/2019 16:18 GMT
zk_avg_latency 0
zk_max_latency 17
zk_min_latency 0
zk_packets_received 621
zk_packets_sent 622
zk_num_alive_connections 2
zk_outstanding_requests 0
zk_server_state standalone
zk_znode_count 12
zk_watch_count 0
zk_ephemerals_count 2
zk_approximate_data_size 154
zk_open_file_descriptor_count 30
zk_max_file_descriptor_count 4096
zk_fsync_threshold_exceed_count 0h).展示watch的信息
命令：echo wchs|nc hostname 2181
## 未添加watch前
[bigdata@carbondata data]$ echo wchs|nc 192.168.133.132 2181
0 connections watching 0 paths
Total watches:0
## 添加watch
[zk: localhost:2181(CONNECTED) 3] stat /hbase/tmp watch
cZxid = 0x20
ctime = Fri Aug 23 00:33:42 CST 2019
mZxid = 0x20
mtime = Fri Aug 23 00:33:42 CST 2019
pZxid = 0x20
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x100002177b70003
dataLength = 4
numChildren = 0
[zk: localhost:2181(CONNECTED) 4] get /hbase/temp watch
test
cZxid = 0x21
ctime = Fri Aug 23 00:34:54 CST 2019
mZxid = 0x21
mtime = Fri Aug 23 00:34:54 CST 2019
pZxid = 0x21
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x100002177b70003
dataLength = 4
numChildren = 0
## 展示watch的信息
[bigdata@carbondata data]$ echo wchs|nc 192.168.133.132 2181
1 connections watching 2 paths
Total watches:2i).显示session的watch信息
命令：echo wchc|nc hostname 2181
[bigdata@carbondata data]$ echo wchc|nc 192.168.133.132 2181
wchc is not executed because it is not in the whitelist.
[bigdata@carbondata zookeeper-3.4.14]$ echo wchc|nc 192.168.133.132 2181
0x100002177b70003
/hbase/temp
/hbase/tmpi).显示path的watch信息
命令：echo wchp|nc hostname 2181
[bigdata@carbondata zookeeper-3.4.14]$ echo wchp|nc 192.168.133.132 2181
wchp is not executed because it is not in the whitelist.
[bigdata@carbondata zookeeper-3.4.14]$ echo wchp|nc 192.168.133.132 2181
/hbase/temp
0x100002177b70003
/hbase/tmp
0x100002177b70003三.问题
问题描述
在查看session和path的watch信息时出现
wchc is not executed because it is not in the whitelist.
wchp is not executed because it is not in the whitelist.解决办法
需修改配置文件，然后重启Zookeeper，查看
## zoo.cfg配置文件中添加
4lw.commands.whitelist=*
## 重启zookeeper
./bin/zkServer.sh restart ./conf/zoo.cfg
## 显示session的watch信息
[bigdata@carbondata zookeeper-3.4.14]$ echo wchc|nc 192.168.133.132 2181
0x100002177b70003
/hbase/temp
/hbase/tmp
## 显示path的watch信息
[bigdata@carbondata zookeeper-3.4.14]$ echo wchp|nc 192.168.133.132 2181
/hbase/temp
0x100002177b70003
/hbase/tmp
0x100002177b70003