hadoop是由java 語言編寫的主從結構分佈式計算存儲架構

準備工作：

操作系統： Ubuntu16.04
軟件安裝包：jdk-8u171-linux-x64.tar.gz ； hadoop-2.6.5.tar.gz

配置環境：3臺虛擬機

         master:192.168.122.10
         node1 :192.168.122.11
         node1 :192.168.122.12

前提條件：三臺虛擬機已經配置過SSH和主機名，如果沒有，請自行百度配置。

第一步：安裝jdk

因爲hadoop是由java編寫的，所以底層需要依賴java環境， jdk下載地址，可選擇合適的版本 http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

在master上操作

1.下載jdk

用wget下載，如下

root@master:/opt/tar# wget http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz
root@master:/opt/tar# l
jdk-8u171-linux-x64.tar.gz

2.解壓tar包

可以自己先創一個目錄來解壓方便以後管理，這次我就解壓在opt目錄下

root@master:/opt/tar# tar -zxvf jdk-8u171-linux-x64.tar.gz -C /opt/

root@master:/opt# l
jdk1.8.0_171/

3.將jdk添加到環境變量中

root@master:/opt# vim /etc/profile

在文件末尾添加

export JAVA_HOME=/opt/jdk1.8.0_171
export PATH=$PATH:$JAVA_HOME/bin

4.刷新環境變量文件

root@master:/opt# echo $JAVA_HOME       #沒刷新前的結果爲空

root@master:/opt# source  /etc/profile  #刷新
root@master:/opt# echo $JAVA_HOME
/opt/jdk1.8.0_171
root@master:/opt# java -version         #看java版本
openjdk version "1.8.0_171"
OpenJDK Runtime Environment (build 1.8.0_171-8u171-b11-0ubuntu0.16.04.1-b11)
OpenJDK 64-Bit Server VM (build 25.171-b11, mixed mode)

到這裏master的上面的jdk就安裝好了接下來就是將從節點上也安裝，這裏就可以將master上解壓好和修改好的/etc/profile文件直接拷貝到從節點上了，這樣比較方便，不然還得重複配置。
這裏我還是將jdk放在從節點的/opt目錄下

root@master:/opt# scp -r jdk1.8.0_171/ node1:/opt       #拷貝jdk到node1
root@master:/opt# scp -r jdk1.8.0_171/ node2:/opt       #拷貝jdk到node2

root@master:/opt# scp -r /etc/profile node1:/etc/       #拷貝環境變量文件到node1
root@master:/opt# scp -r /etc/profile node2:/etc/       #拷貝環境變量文件到node2

在node1和node2上執行

source  /etc/profile  #刷新

到這裏三臺虛擬機的JDK就全部安裝好了！

第二步：安裝hadoop

從網站 http://hadoop.apache.org/releases.html 找到合適的hadoop的二進制版本，本次我用的是2.6.5

1. 下載

root@master:/opt/tar# wget http://www-eu.apache.org/dist/hadoop/common/hadoop-2.6.5/hadoop-2.6.5.tar.gz

2.解壓

root@master:/opt/tar# tar -zxvf hadoop-2.6.5.tar.gz -C /opt/

root@master:/opt# l
hadoop-2.6.5/ jdk1.8.0_171/

3.修改配置文件

進入/opt/hadoop-2.6.5/etc/hadoop目錄下,這裏面都是配置文件

root@master:/opt/hadoop-2.6.5/etc/hadoop# l
capacity-scheduler.xml  hadoop-env.sh               httpfs-env.sh            kms-env.sh            mapred-env.sh               ssl-server.xml.example
configuration.xsl       hadoop-metrics2.properties  httpfs-log4j.properties  kms-log4j.properties  mapred-queues.xml.template  yarn-env.cmd
container-executor.cfg  hadoop-metrics.properties   httpfs-signature.secret  kms-site.xml          mapred-site.xml.template    yarn-env.sh
core-site.xml           hadoop-policy.xml           httpfs-site.xml          log4j.properties      slaves                      yarn-site.xml
hadoop-env.cmd          hdfs-site.xml               kms-acls.xml             mapred-env.cmd        ssl-client.xml.example

1.修改hadoop-env.sh

裏面是啓動的腳本文件，將jdk導入

root@master:/opt/hadoop-2.6.5/etc/hadoop# echo $JAVA_HOME   #獲取jdk據對路徑
/opt/jdk1.8.0_171
root@master:/opt/hadoop-2.6.5/etc/hadoop# vim hadoop-env.sh

寫入export JAVA_HOME=/opt/jdk1.8.0_171保存退出

2.修改core-site.xml

核心配置文件

root@master:/opt/hadoop-2.6.5/etc/hadoop# vim core-site.xml

寫入

<configuration>
<!--NameNode的地址-->
<property>
  <name>fs.defaultFS</name>
  <value>hdfs://master:9000</value>
</property>
<!--HDFS保存數據塊、元信息和日誌的目錄-->
<property>
  <name>hadoop.tmp.dir</name>
  <value>file:/opt/hadoop-2.6.5/hadooptmp</value>
</property>
</configuration>

裏面內容以key-value形式書寫，規定hadoop的默認文件系統爲hdfs以對應的路徑和端口（9000）。hadoop產生的臨時文件存放地址（/opt/hadoop-2.6.5/hadooptmp）

3.hdfs-site.xml

這個文件不配置也行，就會用默認值，配置了就根據配置的內容來

root@master:/opt/hadoop-2.6.5/etc/hadoop# vim hdfs-site.xml

<configuration>
<!--namenode產生的臨時文件保存地址-->
<property>
    <name>dfs.namenode.name.dir</name>
    <value>file:/opt/hadoop-2.6.5/hadooptmp</value>
</property>
<!--datanode產生的臨時文件保存地址-->
<property>
    <name>dfs.datanode.data.dir</name>
    <value>file:/opt/hadoop-2.6.5/haooptmp</value>
</property>
<!--數據塊的冗餘度(副本)，默認：3-->
<property>
    <name>dfs.replication</name>
    <value>1</value>
</property>
</configuration>

在這裏面我配置了hdfs文件的副本數，默認爲3份，但因爲我的虛擬機空間不足，這裏就配置了1份。大家也可以根據實際要求進行配置。

4.mapred-site.xml

這個文件是沒有的，只提供一個tmp文件

root@master:/opt/hadoop-2.6.5/etc/hadoop# cp mapred-site.xml.template mapred-site.xml
root@master:/opt/hadoop-2.6.5/etc/hadoop# vim mapred-site.xml

<configuration>
<!--MapReduce運行的框架-->
<property>
  <name>mapreduce.framework.name</name>
  <value>yarn</value>
</property>
</configuration>

mapreduce平行平臺的名稱（這裏指定爲yarn）

5.yarn-site.xml

root@master:/opt/hadoop-2.6.5/etc/hadoop# vim yarn-site.xml

<configuration>
<!-- Site specific YARN configuration properties -->
<property>
<!--ResourceManager的地址-->
  <name>yarn.resourcemanager.hostname</name>
  <value>master</value>
</property>
<!--MapReduce運行的方式是：shuffle-->
<property>
  <name>yarn.nodemanager.aux-services</name>
  <value>mapreduce_shuffle</value>
</property>
</configuration>

這裏面配置yarn的resourcemanager在哪個節點上運行（這裏我I設置爲master）,和yarn需要的shuffle服務。

到這裏master上的hadoop就配置好了，接下來就這這個hadoop文件複製到從節點上

root@master:/opt# scp -r hadoop-2.6.5/ node1:/opt/
root@master:/opt# scp -r hadoop-2.6.5/ node2:/opt/

2. 爲Hadoop添加環境變量

輸入命令：vim /etc/profile

添加如下內容: export HADOOP_HOME=/opt/hadoop-2.6.5 export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

刷新

source  /etc/profile  #刷新

將這些內容也寫到從節點的文件下，或者通過scp傳過去從節點刷新。

3. 配置slaves

root@master:/opt/hadoop-2.6.5/etc/hadoop# vim slaves

如圖所示配置意味着master節點此時既充當主節點也充當從節點（這樣可以少開一個虛擬機，節省資源，服務器性能好可以不這樣做）

4. 格式化文件系統

輸入命令：hdfs namenode -format 看到高亮語句證明格式化成功！ Storage directory /root/training/hadoop-2.6.5/hadooptmp has been successfully formatted.

安裝成功！

測試

啓動namenode

root@master:/opt/hadoop-2.6.5/sbin# hadoop-daemon.sh start namenode
starting namenode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-namenode-master.out
root@master:/opt/hadoop-2.6.5/sbin# jps
2420 NameNode
3406 Jps

成功！其中hadoop-daemon.sh是一個啓動腳本

關閉namenode

root@master:/opt/hadoop-2.6.5/sbin# hadoop-daemon.sh stop namenode
stopping namenode
root@master:/opt/hadoop-2.6.5/sbin# jps
11754 Jps

一鍵啓動所有節點(集羣) namenode+datanode

主節點

root@master:/opt/hadoop-2.6.5/etc/hadoop# start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [master]
master: starting namenode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-namenode-master.out
node1: starting datanode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-datanode-node1.out
node2: starting datanode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-datanode-node2.out
localhost: starting datanode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-datanode-master.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-secondarynamenode-master.out
starting yarn daemons
starting resourcemanager, logging to /opt/hadoop-2.6.5/logs/yarn-root-resourcemanager-master.out
node1: starting nodemanager, logging to /opt/hadoop-2.6.5/logs/yarn-root-nodemanager-node1.out
node2: starting nodemanager, logging to /opt/hadoop-2.6.5/logs/yarn-root-nodemanager-node2.out
localhost: starting nodemanager, logging to /opt/hadoop-2.6.5/logs/yarn-root-nodemanager-master.out


root@master:/opt/hadoop-2.6.5/etc/hadoop# jps
14961 ResourceManager
15204 NodeManager
13125 NameNode
16188 Jps

從節點查看

root@node1:/opt# jps
20656 NodeManager
19927 DataNode
21660 Jps

root@node2:~# jps
17553 DataNode
19514 Jps
18314 NodeManager

成功！

在hdfs中創建一個目錄firstTestDir

root@master:/opt/hadoop-2.6.5/hadooptmp# hadoop dfs -ls /            #查看原始狀態下的目錄（沒有）
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

root@master:/opt/hadoop-2.6.5/hadooptmp# hadoop dfs -mkdir /firstTestDir        #創建目錄
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

root@master:/opt/hadoop-2.6.5/hadooptmp# hadoop dfs -ls /        #查看目錄，已經存在
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

Found 1 items
drwxr-xr-x   - root supergroup          0 2018-05-13 21:13 /firstTestDir

向這個目錄下上傳文件

這裏我將root下的a.txt文件上傳爲例

root@master:~# l
a.txt 
root@master:~# hadoop dfs -put ./a.txt /firstTestDir            #上傳文件a.txt
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

root@master:~# hadoop dfs -ls /firstTestDir        #查看是否成功，ok!
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

Found 1 items
-rw-r--r--   1 root supergroup      22002 2018-05-13 21:14 /firstTestDir/a.txt

運行wordcount

詳情見這裏

UI查詢

訪問 HDFS的Web Console：http://master:50070

訪問 Yarn的Web Console：http://master:8088

關閉所有組件

root@master:/opt/hadoop-2.6.5/etc/hadoop# stop-all.sh

可能遇到的問題：

1.格式化時出現問題

root@master:/opt/hadoop-2.6.5/etc/hadoop# hdfs namenode –format
18/05/12 20:50:16 INFO namenode.NameNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = localhost/127.0.0.1
STARTUP_MSG:   args = [–format]
STARTUP_MSG:   version = 2.6.5
STARTUP_MSG:   classpath = /opt/hadoop-2.6.5/etc/hadoop:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-httpclient-3.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/stax-api-1.0-2.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/avro-1.7.4.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jackson-jaxrs-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/snappy-java-1.0.4.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/httpclient-4.2.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/httpcore-4.2.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/slf4j-api-1.7.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/zookeeper-3.4.6.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/guava-11.0.2.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jackson-mapper-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/mockito-all-1.8.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jersey-core-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-compress-1.4.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jetty-util-6.1.26.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-cli-1.2.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jasper-runtime-5.5.23.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/hadoop-auth-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/apacheds-kerberos-codec-2.0.0-M15.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/activation-1.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/xz-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/curator-recipes-2.6.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jaxb-impl-2.2.3-1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-logging-1.1.3.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jetty-6.1.26.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-collections-3.2.2.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/paranamer-2.3.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/servlet-api-2.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jaxb-api-2.2.2.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jersey-server-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jettison-1.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-beanutils-1.7.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jersey-json-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/protobuf-java-2.5.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/log4j-1.2.17.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/api-asn1-api-1.0.0-M20.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jets3t-0.9.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-beanutils-core-1.8.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/junit-4.11.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/htrace-core-3.0.4.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/asm-3.2.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jsr305-1.3.9.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/java-xmlbuilder-0.4.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jasper-compiler-5.5.23.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-codec-1.4.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/curator-framework-2.6.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/apacheds-i18n-2.0.0-M15.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-configuration-1.6.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/api-util-1.0.0-M20.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-lang-2.6.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-math3-3.1.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jsch-0.1.42.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-el-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/netty-3.6.2.Final.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/curator-client-2.6.0.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jsp-api-2.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jackson-xc-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/jackson-core-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-io-2.4.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/hadoop-annotations-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/gson-2.2.4.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-digester-1.8.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/xmlenc-0.52.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/hamcrest-core-1.3.jar:/opt/hadoop-2.6.5/share/hadoop/common/lib/commons-net-3.1.jar:/opt/hadoop-2.6.5/share/hadoop/common/hadoop-nfs-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/hadoop-common-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/common/hadoop-common-2.6.5-tests.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/guava-11.0.2.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jackson-mapper-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jersey-core-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jetty-util-6.1.26.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-cli-1.2.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jasper-runtime-5.5.23.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-logging-1.1.3.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jetty-6.1.26.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-daemon-1.0.13.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/xml-apis-1.3.04.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/servlet-api-2.5.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jersey-server-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/protobuf-java-2.5.0.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/log4j-1.2.17.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/htrace-core-3.0.4.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/asm-3.2.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jsr305-1.3.9.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/xercesImpl-2.9.1.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-codec-1.4.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-lang-2.6.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-el-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/netty-3.6.2.Final.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jsp-api-2.1.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/jackson-core-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/commons-io-2.4.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/lib/xmlenc-0.52.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/hadoop-hdfs-2.6.5-tests.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/hadoop-hdfs-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/hdfs/hadoop-hdfs-nfs-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-httpclient-3.1.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/stax-api-1.0-2.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jackson-jaxrs-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/zookeeper-3.4.6.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/guava-11.0.2.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jackson-mapper-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jersey-core-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-compress-1.4.1.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jetty-util-6.1.26.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-cli-1.2.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/activation-1.1.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/xz-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jaxb-impl-2.2.3-1.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-logging-1.1.3.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jetty-6.1.26.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-collections-3.2.2.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/servlet-api-2.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jaxb-api-2.2.2.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jersey-server-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jettison-1.1.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jersey-json-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jline-0.9.94.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/protobuf-java-2.5.0.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/log4j-1.2.17.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/guice-3.0.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/asm-3.2.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jersey-guice-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jsr305-1.3.9.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/leveldbjni-all-1.8.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jersey-client-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-codec-1.4.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/guice-servlet-3.0.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-lang-2.6.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/netty-3.6.2.Final.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/aopalliance-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jackson-xc-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/jackson-core-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/commons-io-2.4.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/lib/javax.inject-1.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-server-resourcemanager-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-server-web-proxy-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-api-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-applications-distributedshell-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-server-applicationhistoryservice-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-server-common-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-applications-unmanaged-am-launcher-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-client-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-common-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-server-tests-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-server-nodemanager-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/yarn/hadoop-yarn-registry-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/avro-1.7.4.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/snappy-java-1.0.4.1.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/jackson-mapper-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/jersey-core-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/commons-compress-1.4.1.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/xz-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/paranamer-2.3.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/jersey-server-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/protobuf-java-2.5.0.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/log4j-1.2.17.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/guice-3.0.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/junit-4.11.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/asm-3.2.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/jersey-guice-1.9.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/leveldbjni-all-1.8.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/guice-servlet-3.0.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/netty-3.6.2.Final.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/aopalliance-1.0.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/jackson-core-asl-1.9.13.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/commons-io-2.4.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/hadoop-annotations-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/hamcrest-core-1.3.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/lib/javax.inject-1.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.5-tests.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-plugins-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.6.5.jar:/opt/hadoop-2.6.5/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-2.6.5.jar:/opt/hadoop-2.6.5/contrib/capacity-scheduler/*.jar
STARTUP_MSG:   build = https://github.com/apache/hadoop.git -r e8c9fe0b4c252caf2ebf1464220599650f119997; compiled by 'sjlee' on 2016-10-02T23:43Z
STARTUP_MSG:   java = 1.8.0_171
************************************************************/
18/05/12 20:50:16 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
18/05/12 20:50:16 INFO namenode.NameNode: createNameNode [–format]
Usage: java NameNode [-backup] | 
	[-checkpoint] | 
	[-format [-clusterid cid ] [-force] [-nonInteractive] ] | 
	[-upgrade [-clusterid cid] [-renameReserved<k-v pairs>] ] | 
	[-upgradeOnly [-clusterid cid] [-renameReserved<k-v pairs>] ] | 
	[-rollback] | 
	[-rollingUpgrade <rollback|downgrade|started> ] | 
	[-finalize] | 
	[-importCheckpoint] | 
	[-initializeSharedEdits] | 
	[-bootstrapStandby] | 
	[-recover [ -force] ] | 
	[-metadataVersion ]  ]

18/05/12 20:50:16 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at localhost/127.0.0.1
************************************************************/

原因 hdfs namenode –format "-format"中的-是中文橫線，改成英文就好了

2. 通過hadoop dfsadmin -report命令查看到的全是0值，或者上傳文件時提示失敗，報錯是沒有可用的datanode。

解決方法，

1.可能是/etc/hosts文件裏的主機名和ip對應有問題，可刪除沒用的對應或易混淆的。
2.防火牆沒關
3.ssh沒配成功
4.可能多次格式化後namenode和datanode上的clusterID不一致，刪除主從節點上的tmp文件，重新格式化。
5.節點的內存。

ubuntu中安裝hadoop集羣 頂 原 薦