正文之前

作为一个以后肯定要做大数据的人，至今还没玩过Java 和 Hadoop 会不会被老师打死？所以就想着，在我的国外的云主机上搭建个Hadoop ，以后在 dell 电脑的ubuntu系统下也搭建一个，然后还有一台老戴尔可以搭一个，mac也可以搭一个，勉强算是一个分布式集群了？不管了。反正今天先把Hadoop在Ubuntu 17.04 下搭建好吧！

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第1张图片

正文

国内的资料都太老了。我就用Google搜了一波，果然好用啊！！

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第2张图片

之后选择了一个教程：
http://www.admintome.com/blog/installing-hadoop-on-ubuntu-17-10/
下面进入安装环节：

1、 Install required software

# apt update && apt upgrade -y
# reboot

# apt install -y openjdk-8-jdk

# apt install ssh pdsh -y

2、 Download Hadoop

# wget http://apache.cs.utah.edu/hadoop/common/stable/hadoop-2.8.2.tar.gz
# tar -xzvf hadoop-2.8.2.tar.gz
# cd hadoop-2.8.2/

上面的网址现在好像废了。我找了一些新的，你们自己看条件选择：

http://apache.claz.org/hadoop/common/hadoop-2.8.2/hadoop-2.8.2.tar.gz

http://apache.claz.org/hadoop/common/

下面是下载安装和安装完毕之后的样子:

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第3张图片

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第4张图片

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第5张图片

下面进入配置环节：

We need to make some additions to our configuration, so edit the next couple of files with the appropriate contents:

etc/hadoop/hadoop-env.sh

export JAVA_HOME=/usr

etc/hadoop/core-site.xml


    
        fs.defaultFS
        hdfs://localhost:9000

etc/hadoop/hdfs-site.xml


    
        dfs.replication
        1

Now in order to make the scripts work, we need to setup passwordless SSH to localhost:

  $ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
  $ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
  $ chmod 0600 ~/.ssh/authorized_keys

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第6张图片

Format the HDFS filesystem.

# bin/hdfs namenode -format

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第7张图片

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第8张图片

And finally, start up HDFS.

# sbin/start-dfs.sh

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第9张图片

After it starts up you can access the web interface for the NameNode at this URL:
http://{server-ip}50070 .

因为我的是云主机，所以直接用类似网站的方式也可以进入：

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第10张图片

Configure YARN

Create the directories we will need for YARN.

# bin/hdfs dfs -mkdir /user
# bin/hdfs dfs -mkdir /user/root

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第11张图片

Edit etc/hadoop/mapred-site.xml and add the following contents:


    
        mapreduce.framework.name
        yarn

And edit

etc/hadoop/yarn-site.xml:


        yarn.nodemanager.aux-services
        mapreduce_shuffle
    
    
        yarn.nodemanager.vmem-check-enabled
        false

Start YARN:

# sbin/start-yarn.sh

如果无法启动，报错如下：

root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# sbin/start-yarn.sh
starting yarn daemons
resourcemanager running as process 16803. Stop it first.
localhost: starting nodemanager, logging to /home/hustwolf/Hadoop/hadoop-2.8.2/logs/yarn-root-nodemanager-HustWolfzzb.out
root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# kill -9 16803
root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /home/hustwolf/Hadoop/hadoop-2.8.2/logs/yarn-root-resourcemanager-HustWolfzzb.out
localhost: nodemanager running as process 17374. Stop it first.
root@HustWolfzzb:/home/hustwolf/Hadoop/hadoop-2.8.2# ls

那么，先把所有的先关了。方法是到sbin下采用stop脚本，可以直接stop-all.sh 也可以试试stop-dfs.sh stop-yarn.sh 两个搭配。然后再开启一次就ok.

You can now view the web interface at

http://{server-ip}:8088 .

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第12张图片

Testing our installation

In order to test that everything is working we can run a MapReduce job using YARN:

# bin/yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.2.jar pi 16 1000

This is going to calculate PI to 16 decimal places for us using the quasiMonteCarlo method. After a minute or two you should get your response:

Job Finished in 96.095 seconds
Estimated value of Pi is 3.14250000000000000000

我在这儿遇到了一个很苦恼的问题就是:

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第13张图片

Number of Maps  = 16
Samples per Map = 1000
17/11/24 07:49:52 WARN ipc.Client: Failed to connect to server: localhost/127.0.0.1:9000: try once and fail.
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)
    at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:682)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:778)
    at org.apache.hadoop.ipc.Client$Connection.access$3500(Client.java:410)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1544)
    at org.apache.hadoop.ipc.Client.call(Client.java:1375)
    at org.apache.hadoop.ipc.Client.call(Client.java:1339)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
    at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:792)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:409)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:346)
    at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1704)
    at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1436)
    at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1433)
    at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
    at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1433)
    at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1437)
    at org.apache.hadoop.examples.QuasiMonteCarlo.estimatePi(QuasiMonteCarlo.java:278)
    at org.apache.hadoop.examples.QuasiMonteCarlo.run(QuasiMonteCarlo.java:358)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
    at org.apache.hadoop.examples.QuasiMonteCarlo.main(QuasiMonteCarlo.java:367)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
    at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
    at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.util.RunJar.run(RunJar.java:234)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
java.net.ConnectException: Call From HustWolfzzb/127.0.1.1 to localhost:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:801)
    at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:732)
    at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1487)
    at org.apache.hadoop.ipc.Client.call(Client.java:1429)
    at org.apache.hadoop.ipc.Client.call(Client.java:1339)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
    at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:792)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:409)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
    at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:346)
    at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1704)
    at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1436)
    at org.apache.hadoop.hdfs.DistributedFileSystem$27.doCall(DistributedFileSystem.java:1433)
    at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
    at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1433)
    at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1437)
    at org.apache.hadoop.examples.QuasiMonteCarlo.estimatePi(QuasiMonteCarlo.java:278)
    at org.apache.hadoop.examples.QuasiMonteCarlo.run(QuasiMonteCarlo.java:358)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
    at org.apache.hadoop.examples.QuasiMonteCarlo.main(QuasiMonteCarlo.java:367)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
    at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
    at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.hadoop.util.RunJar.run(RunJar.java:234)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
Caused by: java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
    at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
    at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)
    at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:682)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:778)
    at org.apache.hadoop.ipc.Client$Connection.access$3500(Client.java:410)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1544)
    at org.apache.hadoop.ipc.Client.call(Client.java:1375)
    ... 38 more

至今还没解决，不过文章实在没啥好改的了。后续如果有了解决之道，我就在评论区贴出来，或者直接修改文章吧！拜了个拜~ 健身去~~！！

This should be enough to get you started on your Hadoop journey. Subscribe to my newsletter below to get notifications of more Hadoop articles.

I hope you enjoyed this post. If it was helpful or if it was way off then please comment and let me know.

好像成功了？？？我好像是漏了建立hdfs用户的那一关？然后还有就是重启了一次，以及对于一些东西的缺漏。不过就在我期待值最高的时候，事实给了我狠狠的一击。好吧，GG。不过还是发现了不少了的有用的教程！！

Hadoop环境安装设置
hadoop 2.7.1安装和配置

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）_第14张图片

正文之后

人家老外英文写的挺好的，我就不多改了。想必就算看不大懂也可以摸索着在百度翻译的帮助下get 到点，实在不行可以发评论问我嘛而且，命令都给你整好了，难道还不会？不存在的！！

【Hadoop学起来】分布式Hadoop的搭建（Ubuntu 17.04）

正文之前

正文

Configure YARN

Testing our installation

正文之后

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