Hadoop分布式配置

本作品由Man_华创作，采用知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议进行许可。
基于http://www.cnblogs.com/manhua/上的作品创作。

请先参照Linux安装Java安装好java，以及参照Hadoop伪分布模式配置安装好SSH

Hadoop请按以下过程安装。

 [All]LinuxOS+Java+hostname&hosts+ssh install
 [master]generate ssh &scp to slaves + configure Hadoop & scp to slaves
 [slaves]add master's key to ssh file + create link for hadoop-2.2.0

准备工作

hostname	IP Address
master	192.168.1.100
slave1	192.168.1.102

修改主机名（对应地改成master、slave1）

sudo vi /etc/hostname

修改hosts

sudo vi /etc/hosts

127.0.0.1    localhost
192.168.1.121    master
192.168.1.122    slave1

关闭防火墙（重启生效）

sudo ufw disable

先重启，使得主机名生效，并以hadoop用户登录

SSH

进入master的.ssh目录将key复制到各slave中

ssh-copy-id hadoop@slave1

至此，可以在master上面ssh hadoop@slave1进行无密码登陆了

 对其余slave作同样处理即可

Hadoop安装和配置 

安装参考 https://www.cnblogs.com/manhua/p/3529928.html

使用备份的配置 文件

cd ~/setupEnv/hadoop_distribute_setting
sudo cp core-site.xml ~/hadoop/etc/hadoop
sudo cp hadoop-env.sh ~/hadoop/etc/hadoop
sudo cp hdfs-site.xml ~/hadoop/etc/hadoop
sudo cp mapred-site.xml ~/hadoop/etc/hadoop
sudo cp yarn-site.xml ~/hadoop/etc/hadoop

（手动配置）进入Hadoop配置文件目录

cd ~/hadoop/etc/hadoop

sudo gedit core-site.xml

<property>
    <name>fs.defaultFS</name>
    <value>hdfs://master:9000</value>
</property>
<property>
    <name>hadoop.tmp.dir</name>
    <value>/home/hadoop/hadoop/tmp</value>
</property>
<property>
    <name>hadoop.proxyuser.hadoop.hosts</name>
    <value>*</value>
</property>
<property>
    <name>hadoop.proxyuser.hadoop.groups</name>
    <value>*</value>
</property>

sudo gedit hdfs-site.xml

<property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>master:9001</value>
</property>
<property>
    <name>dfs.replication</name>
    <value>2</value>
</property>
<property>
    <name>dfs.webhdfs.enabled</name>
    <value>true</value>
</property>

默认不存在此文件，需要创建：
sudo cp mapred-site.xml.template mapred-site.xml
sudo gedit mapred-site.xml

<property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
</property>
<property>
    <name>mapreduce.jobhistory.address</name>
    <value>master:10020</value>
</property>
<property>
    <name>mapreduce.jobhistory.webapp.address</name>
    <value>master:19888</value>
</property>

sudo gedit yarn-site.xml

<property>
    <name>yarn.nodemanager.aux-services</name> 
    <value>mapreduce_shuffle</value>
    </property>
<property>
    <name>yarn.nodemanager.aux-services.mapreduce_shuffle.class</name>
    <value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>
<property>
    <name>yarn.resourcemanager.address</name>
    <value>master:8032</value>
</property>
<property>
    <name>yarn.resourcemanager.scheduler.address</name>
    <value>master:8030</value>
</property>
<property>
    <name>yarn.resourcemanager.resource-tracker.address</name>
    <value>master:8031</value>
</property>
<property>
    <name>yarn.resourcemanager.admin.address</name>
    <value>master:8033</value>
</property>
<property>
    <name>yarn.resourcemanager.webapp.address</name>
    <value>master:8088</value>
</property>

新建masters文档：添加master

修改slaves：添加slave1

sudo gedit slaves

 复制配置到slave1上

cp2slave.sh
#!/bin/bash

scp –r /home/hadoop/hadoop-2.2.0/ hadoop@slave1:~/

 

测试

在master中启动hadoop

hdfs namenode –format
start-dfs.sh
start-yarn.sh

在master上运行jps命令可见到namenode、secondarynamenode、resourcemanager

在slave1上运行jps命令可见到datanode、nodemanager

=============================================

使用过程中如果出现无法解决的问题，或者在修改配置文件，可以尝试执行以下步骤：

〇停止任务

hadoop job -kill [jobID，如job_1394263427873_0002]

①stop-all.sh

②[修改配置文件]

③scp setting 到每台slave

cd /home/casper/hadoop/hadoop-2.2.0/etc/hadoop
scp core-site.xml casper@hdp002:~/hadoop/hadoop-2.2.0/etc/hadoop
scp hdfs-site.xml casper@hdp002:~/hadoop/hadoop-2.2.0/etc/hadoop
scp mapred-site.xml casper@hdp002:~/hadoop/hadoop-2.2.0/etc/hadoop
scp yarn-site.xml casper@hdp002:~/hadoop/hadoop-2.2.0/etc/hadoop
scp slaves casper@hdp002:~/hadoop/hadoop-2.2.0/etc/hadoop

④删除每台机器的临时文件夹、dfs数据（路径根据自己配置的修改）

cd ~/hadoop
rm -rf dfs
rm -rf tmp
ls

⑤格式化namenode

hadoop namenode -format

⑥启动start-dfs.shstart-yarn.sh

⑦上传文件 ： hadoop fs  -put ss-out.txt  /

⑧运行jar： hadoop jar part-45-90-3-goodrule.jar RICO /ss-out.txt /rico-out 5 0.9

---

why map task always running on a single node

If that doesn't work, check to make sure that your cluster is configured correctly. Specifically, check that your name node has paths to your other nodes set in its slaves file, and that each slave node has your name node set in its masters file.

 -----TODO

create masters file in etc/hadoop/

reset block size in hdfs-site.xml to enlarge the number of blocks--check block size in dfs browser later

 最简单方法：

上传的时候使用命令  hadoop fs -D dfs.blocksize=16777216 -put ss-part-out.txt  /targetDir