為什么80%的碼農(nóng)都做不了架構(gòu)師？>>> ??

【環(huán)境】：

經(jīng)常遭遇因?yàn)橐蕾囓浖姹静黄ヅ鋵?dǎo)致的問題，這次大意了，以為java問題不大，就用本來通過yast安裝的java1.6 openjdk去搞了，結(jié)果可想而知，問題很多，反復(fù)定位，反復(fù)谷歌百度，最后一朋友啟發(fā)下決定換換jdk版本。問題解決了，所以這里貼下我的環(huán)境

java環(huán)境：?java version "1.7.0_51"
? ? ? ? ? ? ? ?Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
? ? ? ? ? ? ? ?Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

系統(tǒng)： ? ? ??openSUSE 11.2 (x86_64)

hadoop版本：Hadoop-1.1.2.tar.gz

【Step1:】創(chuàng)建hadoop用戶及用戶組

?組：hadoop?

?用戶：hadoop ?-> /home/hadoop

?加權(quán)限： vi /etc/sudoers ?增加?hadoop??ALL=(ALL:ALL)??ALL

【Stpe2:】安裝hadoop

?筆者tar xf 安裝完后是這樣的目錄結(jié)構(gòu)(供參考)：

?/home/hadoop/hadoop-home/[bin|conf]

【Step3:】配SSH(避免啟動(dòng)hadoop時(shí)需要密碼)

?略安裝ssh

?ssh-keygen -t rsa -P "" [一路回車及確認(rèn)]

?cat ~/.ssh/id_rsa.pub >>?~/.ssh/authorized_keys

?嘗試 ssh localhost [檢查下是不是不需要密碼啦]

【Step4:】安裝java

?版本見【環(huán)境】部分

【Step5:】配conf/hadoop-env.sh?

export JAVA_HOME=/usr/java/jdk1.7.0_17xxx ? ? ? ?#[jdk目錄]

export HADOOP_INSTALL=/home/hadoop/hadoop-home ? ? ? ? ?

export PATH=$PATH:$HADOOP_INSTALL/bin ? ? ? ?#[這里是hadoop腳本所在目錄]

【Step6:】使用單機(jī)模式

?hadoop?version

mkdir input

?man find > input/test.txt

?hadoop?jar?hadoop-examples-1.1.2.jar?wordcount?input?output

【Step7:】偽分布模式（單機(jī)實(shí)現(xiàn)namenode,datanode,tackerd等模塊）

?conf/[core-site.xml、hdfs-site.xml、mapred-site.xml]

?core-site.xml

<configuration><property><name>fs.default.name</name><value>hdfs://localhost:9000</value></property><property><name>hadoop.tmp.dir</name><value>/usr/local/hadoop/tmp</value></property> </configuration>

hdfs-site.xml

<configuration><property><name>dfs.replication</name><value>2</value></property><property><name>dfs.name.dir</name><value>/usr/local/hadoop/datalog1,/usr/local/hadoop/datalog2</value></property><prop<configuration>???<property>??<name>mapred.job.tracker</name><value>localhost:9001</value>???</property> </configuration>erty><name>dfs.data.dir</name><value>/usr/local/hadoop/data1,/usr/local/hadoop/data2</value></property> </configuration>

mapred-site.xml

<configuration>???<property>??<name>mapred.job.tracker</name><value>localhost:9001</value>???</property> </configuration>

【Step8:】啟動(dòng)

?格式化：hadoop?namenode?-format

?cd bin

?sh?start-all.sh

hadoop@linux-peterguo:~/hadoop-home/bin>?sh?start-all.sh starting?namenode,?logging?to?/home/hadoop/hadoop-home/libexec/../logs/hadoop-hadoop-namenode-linux-peterguo.out localhost:?starting?datanode,?logging?to?/home/hadoop/hadoop-home/libexec/../logs/hadoop-hadoop-datanode-linux-peterguo.out localhost:?starting?secondarynamenode,?logging?to?/home/hadoop/hadoop-home/libexec/../logs/hadoop-hadoop-secondarynamenode-linux-peterguo.out starting?jobtracker,?logging?to?/home/hadoop/hadoop-home/libexec/../logs/hadoop-hadoop-jobtracker-linux-peterguo.out localhost:?starting?tasktracker,?logging?to?/home/hadoop/hadoop-home/libexec/../logs/hadoop-hadoop-tasktracker-linux-peterguo.out

?jps查看進(jìn)程是否全啟動(dòng) 五個(gè)java進(jìn)程 jobtracker/tasktracker/namenode/datanode/sencondarynamenode

?可以通過下面的操作來查看服務(wù)是否正常，在Hadoop中用于監(jiān)控集群健康狀態(tài)的Web界面：
http://localhost:50030/?- Hadoop 管理介面
http://localhost:50060/?- Hadoop Task Tracker 狀態(tài)
http://localhost:50070/?- Hadoop DFS 狀態(tài)

【Step9:】操作dfs數(shù)據(jù)文件

hadoop?dfs?-mkdir?input

hadoop?dfs?-copyFromLocal input/test.txt input

hadoop?dfs?-ls input

【Step10:】運(yùn)行dfs上的mr

hadoop?jar?hadoop-examples-1.1.2.jar?wordcount?input?output?

hadoop?dfs?-cat?output/*

【Step11:】關(guān)閉

stop-all.sh

參考：http://blog.csdn.net/zhaoyl03/article/details/8657104

轉(zhuǎn)載于:https://my.oschina.net/sanpeterguo/blog/219656

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