hadoop基础-MapReduce原理

　　　　　　　　　　　　　　　　　　　　　　　　　　Hadoop生态圈-zookeeper本地搭建

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

一.下载zookeeper软件

　　下载地址：https://www.apache.org/dyn/closer.cgi/zookeeper/

二.安装zookeeper

1>.解压源文件

[yinzhengjie@s101 ~]$ tar zxf zookeeper-3.4.12.tar.gz -C /soft/

2>.创建软连接

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[yinzhengjie@s101 ~]$ ln -s /soft/zookeeper-3.4.12/ /soft/zk

3>.配置环境变量

[yinzhengjie@s101 ~]$ tail -3 /etc/profile
#ADD zooKeeper
ZOOKEEPER=/soft/zk
PATH=$PATH:$ZOOKEEPER/bin
[yinzhengjie@s101 ~]$

4>.使配置的环境变量生效

[yinzhengjie@s101 ~]$ source /etc/profile

三.启动zookeeper服务

1>.创建出zookeeper配置文件（我们这里直接把配置文件拷贝过来就好）

[yinzhengjie@s101 ~]$ cp /soft/zk/conf/zoo_sample.cfg /soft/zk/conf/zoo.cfg

2>.启动zookeeper

[yinzhengjie@s101 ~]$ zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[yinzhengjie@s101 ~]$

3>.检查是否启动成功

[yinzhengjie@s101 ~]$ netstat -untalp | grep 2181
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp6 0 0 :::2181 :::* LISTEN 2377/java 
[yinzhengjie@s101 ~]$

4>.启动成功后zookeeper有个QuorumPeerMain进程

[yinzhengjie@s101 ~]$ jps
2377 QuorumPeerMain
2396 Jps
[yinzhengjie@s101 ~]$

四.zookeeper服务端脚本用法

1>.查看服务的状态，我们这是本地模式，显示的状态为standalone

[yinzhengjie@s101 ~]$ zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
Mode: standalone
[yinzhengjie@s101 ~]$

2>.重启zookeeper服务

[yinzhengjie@s101 ~]$ zkServer.sh restart
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[yinzhengjie@s101 ~]$

3>.停止zookeeper服务

[yinzhengjie@s101 ~]$ zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
[yinzhengjie@s101 ~]$

4>.zookeeper服务端的其他用法

[yinzhengjie@s101 ~]$ zkServer.sh 
ZooKeeper JMX enabled by default
Using config: /soft/zk/bin/../conf/zoo.cfg
Usage: /soft/zk/bin/zkServer.sh {start|start-foreground|stop|restart|status|upgrade|print-cmd}
[yinzhengjie@s101 ~]$

五.zookeeper客户端脚本用法

1>.连接客户端（连接成功后需要敲回车执行你需要执行的命令哟！）

[yinzhengjie@s101 ~]$ zkCli.sh -server localhost:2181
Connecting to localhost:2181
2018-05-28 20:36:33,351 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.12-e5259e437540f349646870ea94dc2658c4e44b3b, built on 03/27/2018 03:55 GMT
2018-05-28 20:36:33,354 [myid:] - INFO [main:Environment@100] - Client environment:host.name=s101
2018-05-28 20:36:33,354 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_131
2018-05-28 20:36:33,356 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2018-05-28 20:36:33,356 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/soft/jdk1.8.0_131/jre
2018-05-28 20:36:33,356 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/soft/zk/bin/../build/classes:/soft/zk/bin/../build/lib/*.jar:/soft/zk/bin/../lib/slf4j-log4j12-1.7.25.jar:/soft/zk/bin/../lib/slf4j-api-1.7.25.jar:/soft/zk/bin/../lib/netty-3.10.6.Final.jar:/soft/zk/bin/../lib/log4j-1.2.17.jar:/soft/zk/bin/../lib/jline-0.9.94.jar:/soft/zk/bin/../lib/audience-annotations-0.5.0.jar:/soft/zk/bin/../zookeeper-3.4.12.jar:/soft/zk/bin/../src/java/lib/*.jar:/soft/zk/bin/../conf:
2018-05-28 20:36:33,356 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:os.version=3.10.0-327.el7.x86_64
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:user.name=yinzhengjie
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/home/yinzhengjie
2018-05-28 20:36:33,357 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/home/yinzhengjie
2018-05-28 20:36:33,358 [myid:] - INFO [main:ZooKeeper@441] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@277050dc
Welcome to ZooKeeper!
2018-05-28 20:36:33,378 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1028] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2018-05-28 20:36:33,439 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@878] - Socket connection established to localhost/0:0:0:0:0:0:0:1:2181, initiating session
2018-05-28 20:36:33,446 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1302] - Session establishment complete on server localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x10000b217fa0001, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] 
[zk: localhost:2181(CONNECTED) 0]

[yinzhengjie@s101 ~]$ zkCli.sh -server localhost:2181

2>.查看帮助信息（其实你输入任何一条没有特殊含义的指令都会弹出帮助信息哟）

[zk: localhost:2181(CONNECTED) 0] help
ZooKeeper -server host:port cmd args
stat path [watch]
set path data [version]
ls path [watch]
delquota [-n|-b] path
ls2 path [watch]
setAcl path acl
setquota -n|-b val path
history 
redo cmdno
printwatches on|off
delete path [version]
sync path
listquota path
rmr path
get path [watch]
create [-s] [-e] path data acl
addauth scheme auth
quit 
getAcl path
close 
connect host:port
[zk: localhost:2181(CONNECTED) 1]

[zk: localhost:2181(CONNECTED) 0] help

3>.列出"/"下的节点

[zk: localhost:2181(CONNECTED) 2] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 3]

[zk: localhost:2181(CONNECTED) 2] ls /

4>.创建“name”节点，并添加数据“yinzhengjie”

[zk: localhost:2181(CONNECTED) 3] create /name yinzhengjie
Created /name
[zk: localhost:2181(CONNECTED) 4]

[zk: localhost:2181(CONNECTED) 3] create /name

5>.创建空节点

[zk: localhost:2181(CONNECTED) 4] create /hadoop ''
Created /hadoop
[zk: localhost:2181(CONNECTED) 5]

[zk: localhost:2181(CONNECTED) 4] create /hadoop ''

6>.查看“/name”节点的数据

[zk: localhost:2181(CONNECTED) 5] get /name
yinzhengjie
cZxid = 0x900000009            //(create)节点创建事务的id
ctime = Thu May 31 08:47:48 CST 2018    //创建时间
mZxid = 0x900000009            //(modify)节点修改事务的id
mtime = Thu May 31 08:47:48 CST 2018    //(modify)时间，当当前节点被修改时时间会跟着变化
pZxid = 0x900000009            //最新子节点的CZxid
cversion = 0                //创建的版本号
dataVersion = 0                //删除时指定此版本
aclVersion = 0                //ACL ： Access Control List 
ephemeralOwner = 0x0            //临时拥有者
dataLength = 0                //数据长度
numChildren = 0                //子节点个数
[zk: localhost:2181(CONNECTED) 6]

[zk: localhost:2181(CONNECTED) 5] get /name

7>.设置根节点数据为“yinzhengjie”

[zk: localhost:2181(CONNECTED) 6] set / yinzhengjie
cZxid = 0x0
ctime = Wed Dec 31 16:00:00 PST 1969
mZxid = 0xa
mtime = Mon May 28 20:43:47 PDT 2018
pZxid = 0x9
cversion = 1
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 11
numChildren = 3
[zk: localhost:2181(CONNECTED) 7]

[zk: localhost:2181(CONNECTED) 6] set / yinzhengjie

8>.删除单个节点

[zk: localhost:2181(CONNECTED) 7] ls / 
[name, hadoop, zookeeper]
[zk: localhost:2181(CONNECTED) 8] ls /hadoop
[]
[zk: localhost:2181(CONNECTED) 9] delete /hadoop
[zk: localhost:2181(CONNECTED) 10] 
[zk: localhost:2181(CONNECTED) 10] ls / 
[name, zookeeper]
[zk: localhost:2181(CONNECTED) 11]

[zk: localhost:2181(CONNECTED) 9] delete /hadoop

9>.递归删除节点

[zk: localhost:2181(CONNECTED) 17] ls / 
[name, zookeeper]
[zk: localhost:2181(CONNECTED) 18] 
[zk: localhost:2181(CONNECTED) 18] create /name/zookeeper zk
Created /name/zookeeper
[zk: localhost:2181(CONNECTED) 19] ls /
[name, zookeeper]
[zk: localhost:2181(CONNECTED) 20] ls /name
[zookeeper]
[zk: localhost:2181(CONNECTED) 21] 
[zk: localhost:2181(CONNECTED) 21] rmr /name 
[zk: localhost:2181(CONNECTED) 22] 
[zk: localhost:2181(CONNECTED) 22] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 23]

[zk: localhost:2181(CONNECTED) 21] rmr /name

10>.退出客户端程序

[zk: localhost:2181(CONNECTED) 23] quit
Quitting...
2018-05-28 20:50:21,796 [myid:] - INFO [main:ZooKeeper@687] - Session: 0x10000b217fa0004 closed
2018-05-28 20:50:21,798 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@521] - EventThread shut down for session: 0x10000b217fa0004
[yinzhengjie@s101 ~]$ 
[yinzhengjie@s101 ~]$

[zk: localhost:2181(CONNECTED) 23] quit

hadoop基础-MapReduce原理

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