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HomeDatabaseMysql TutorialUbuntu14.04安装Hadoop2.5.2(伪分布模式)

Hadoop也可以运行在一个伪分布模式,每个Hadoop守护进程运行在一个单独的Java程序的一个节点。 伪分布模式需要在单机模式基础上进行配置。 在/software/hadoop/etc/hadoop/ 目录下 core-site.xml,hdfs-site.xml,mapred-site.xml,yarn-site.xml等文件。 下面

Hadoop也可以运行在一个伪分布模式,每个Hadoop守护进程运行在一个单独的Java程序的一个节点。

伪分布模式需要在单机模式基础上进行配置。

在/software/hadoop/etc/hadoop/ 目录下
core-site.xml,hdfs-site.xml,mapred-site.xml,yarn-site.xml等文件。
下面对以上文件进行配置。

一、etc/hadoop/core-site.xml
包含了hadoop启动时的配置信息。

<code><span>configuration</span>>
    <span>property</span>>
        <span>name</span>>fs.defaultFS<span><span>name</span>></span>
        <span>value</span>>hdfs://localhost:9000<span><span>value</span>></span>
    <span><span>property</span>></span>
<span><span>configuration</span>></span></code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

二、etc/hadoop/hdfs-site.xml
用来配置集群中每台主机都可用,指定主机上作为namenode和datanode的目录。

<code><span>configuration</span>>
    <span>property</span>>
        <span>name</span>>dfs.replication<span><span>name</span>></span>
        <span>value</span>>1<span><span>value</span>></span>
    <span><span>property</span>></span>
<span><span>configuration</span>></span></code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

三、etc/hadoop/mapred-site.xml
默认情况下,/usr/local/hadoop/etc/hadoop/文件夹下有mapred.xml.template文件,我们要复制该文件,并命名为mapred.xml,该文件用于指定MapReduce使用的框架

<code><span>configuration</span>>
    <span>property</span>>
        <span>name</span>>mapreduce.framework.name<span><span>name</span>></span>
        <span>value</span>>yarn<span><span>value</span>></span>
    <span><span>property</span>></span>
<span><span>configuration</span>></span></code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

四、etc/hadoop/yarn-site.xml
包含了MapReduce启动时的配置信息。

<code><span>configuration</span>>
    <span>property</span>>
        <span>name</span>>yarn.nodemanager.aux-services<span><span>name</span>></span>
        <span>value</span>>mapreduce_shuffle<span><span>value</span>></span>
    <span><span>property</span>></span>
<span><span>configuration</span>></span></code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

五、格式化hdfs

<code> hdfs namenode -<span>format</span>    </code>

只需要执行一次即可,如果在hadoop已经使用后再次执行,会清除掉hdfs上的所有数据。
Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

六、启动Hadoop
经过上文所描述配置和操作后,下面就可以启动这个单节点的集群
执行启动命令:

<code> sbin/<span><span>start</span>-dfs.sh    </span></code>

执行该命令时,如果有yes /no提示,输入yes回车即可。
Ubuntu14.04安装Hadoop2.5.2(伪分布模式)
接下来,执行:

<code>sbin/<span><span>start</span>-yarn.sh    </span></code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

执行完这两个命令后,Hadoop会启动并运行。
执行 jps命令,会看到Hadoop相关的进程。

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

浏览器打开 http://localhost:50070/,会看到hdfs管理页面。

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

浏览器打开 http://localhost:8088,会看到hadoop进程管理页面。

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

七、WordCount验证
dfs上创建input目录

<code>bin/hadoop fs <span>-mkdir</span> <span>-p</span> input</code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

把hadoop目录下的README.txt拷贝到dfs新建的input里

<code>hadoop fs -copyFromLocal README<span>.txt</span> input</code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

运行WordCount

<code>hadoop jar share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-<span>2.5</span><span>.2</span>-sources<span>.jar</span> org<span>.apache</span><span>.hadoop</span><span>.examples</span><span>.WordCount</span> input output</code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)
执行过程:

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

运行完毕后,查看单词统计结果

<code>hadoop fs <span>-cat</span> output<span>/*</span></code>

Ubuntu14.04安装Hadoop2.5.2(伪分布模式)

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