安装hadoop过程详解
wget http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-1.2.1/hadoop-1.2.1.tar.gz hadoop的下载文件
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安装jdk
http://www.linuxidc.com/Linux/2014-08/105906.htm
安装hadoop
进入
/root/zby/hadoop/hadoop-1.2.1/conf
配置hadoop，主要是配置core-site.xml,hdfs-site.xml,mapred-site.xml三个配置文件
4个文件需要编辑：
第一个文件改个jdk按照路径即可
hadoop-env.sh
export HADOOP_HEAPSIZE=256 修改hadoop所用内存
#export JAVA_HOME=/usr/lib/jvm/jdk7 这行需要编辑
路径不知道可以用如下命令进行查找
[root@iZ28c21psoeZ conf]# echo $JAVA_HOME
/usr/lib/jvm/jdk7
第二个文件：打开文件直接进行替换，如下中文 注释都删除后粘贴。。。
cd /opt/hadoop-1.2.1/conf
vim core-site.xml
第三个文件：如下中文 注释都删除后粘贴。。。
vim hdfs-site.xml
第四个文件：如下中文注释都删除后粘贴。。。
vim mapred-site.xml
接下来还需要修改下vim /etc/profile
将如下代码放置在最后，如果前5行在安装jdk时已经生效可以不用添加。
export JAVA_HOME=/usr/lib/jvm/jdk7
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
export HADOOP_HOME=/opt/hadoop-1.2.1
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$HADOOP_HOME/bin:$PATH
接下来 进入该目录：
/opt/hadoop-1.2.1/bin
对hadoop进行一个格式化操作：
hadoop -namenode -format
如果遇到如下错误：
Warning: $HADOOP_HOME is deprecated.
/opt/hadoop-1.2.1/bin/hadoop: line 350: /usr/lib/jdk7/bin/java: No such file or directory
/opt/hadoop-1.2.1/bin/hadoop: line 434: /usr/lib/jdk7/bin/java: No such file or directory
/opt/hadoop-1.2.1/bin/hadoop: line 434: exec: /usr/lib/jdk7/bin/java: cannot execute: No such file or directory
查看第一个文件是否正确
[root@iZ28c21psoeZ conf]# echo $JAVA_HOME
/usr/lib/jvm/jdk7
接着执行，又报错了。。
[root@iZ28c21psoeZ bin]# hadoop -namenode -format
Warning: $HADOOP_HOME is deprecated.
Unrecognized option: -namenode
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
[root@iZ28c21psoeZ bin]#
可以修改的地方有两个
第一个(次要的)：/opt/hadoop/conf/hadoop-env.sh
修改参数： export HADOOP_HEAPSIZE=256 #默认值为2000M，为Java虚拟机占用的内存的大小
第二个(主要的)：将如下源码放在hadoop最下方保存
查看/opt/hadoop/bin/hadoop 源码：
####################################################################
if [[ $EUID -eq 0 ]]; then
HADOOP_OPTS="$HADOOP_OPTS -jvm server $HADOOP_DATANODE_OPTS"
else
HADOOP_OPTS="$HADOOP_OPTS -server $HADOOP_DATANODE_OPTS"
fi
####################################################################
重新执行，看看结果，貌似又报错了。
[root@iZ28c21psoeZ bin]# ./hadoop namenode -format
Warning: $HADOOP_HOME is deprecated.
16/07/04 18:49:04 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = iZ28c21psoeZ/10.251.57.77
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.7.0_60
************************************************************/
[Fatal Error] core-site.xml:11:3: The element type "property" must be terminated by the matching end-tag "".
16/07/04 18:49:04 FATAL conf.Configuration: error parsing conf file: org.xml.sax.SAXParseException; systemId: file:/opt/hadoop-1.2.1/conf/core-site.xml; lineNumber: 11; columnNumber: 3; The element type "property" must be terminated by the matching end-tag "".
16/07/04 18:49:04 ERROR namenode.NameNode: java.lang.RuntimeException: org.xml.sax.SAXParseException; systemId: file:/opt/hadoop-1.2.1/conf/core-site.xml; lineNumber: 11; columnNumber: 3; The element type "property" must be terminated by the matching end-tag "".
at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1249)
at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1107)
at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1053)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:420)
at org.apache.hadoop.hdfs.server.namenode.NameNode.setStartupOption(NameNode.java:1374)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1463)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1488)
Caused by: org.xml.sax.SAXParseException; systemId: file:/opt/hadoop-1.2.1/conf/core-site.xml; lineNumber: 11; columnNumber: 3; The element type "property" must be terminated by the matching end-tag "".
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:257)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:347)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:177)
at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1156)
... 6 more
16/07/04 18:49:04 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at iZ28c21psoeZ/10.251.57.77
************************************************************/
[root@iZ28c21psoeZ bin]#
根据日志提示是3大配置文件中有错误：
果然：
写成了
重新执行一遍看看：
[root@iZ28c21psoeZ bin]# ./hadoop namenode -format
Warning: $HADOOP_HOME is deprecated.
16/07/04 18:55:26 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = iZ28c21psoeZ/10.251.57.77
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.2.1
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013
STARTUP_MSG: java = 1.7.0_60
************************************************************/
16/07/04 18:55:27 INFO util.GSet: Computing capacity for map BlocksMap
16/07/04 18:55:27 INFO util.GSet: VM type = 64-bit
16/07/04 18:55:27 INFO util.GSet: 2.0% max memory = 259522560
16/07/04 18:55:27 INFO util.GSet: capacity = 2^19 = 524288 entries
16/07/04 18:55:27 INFO util.GSet: recommended=524288, actual=524288
16/07/04 18:55:32 INFO namenode.FSNamesystem: fsOwner=root
16/07/04 18:55:33 INFO namenode.FSNamesystem: supergroup=supergroup
16/07/04 18:55:33 INFO namenode.FSNamesystem: isPermissionEnabled=true
16/07/04 18:55:42 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
16/07/04 18:55:42 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
16/07/04 18:55:42 INFO namenode.FSEditLog: dfs.namenode.edits.toleration.length = 0
16/07/04 18:55:42 INFO namenode.NameNode: Caching file names occuring more than 10 times
16/07/04 18:55:45 INFO common.Storage: Image file /hadoop/dfs/name/current/fsp_w_picpath of size 110 bytes saved in 0 seconds.
16/07/04 18:55:47 INFO namenode.FSEditLog: closing edit log: position=4, editlog=/hadoop/dfs/name/current/edits
16/07/04 18:55:47 INFO namenode.FSEditLog: close success: truncate to 4, editlog=/hadoop/dfs/name/current/edits
16/07/04 18:55:48 INFO common.Storage: Storage directory /hadoop/dfs/name has been successfully formatted.
16/07/04 18:55:48 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at iZ28c21psoeZ/10.251.57.77
************************************************************/
完美：接着做：
cd /opt/hadoop-1.2.1/bin
[root@iZ28c21psoeZ bin]# start-all.sh
Warning: $HADOOP_HOME is deprecated.
starting namenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-namenode-iZ28c21psoeZ.out
localhost: socket: Address family not supported by protocol
localhost: ssh: connect to host localhost port 22: Address family not supported by protocol
localhost: socket: Address family not supported by protocol
localhost: ssh: connect to host localhost port 22: Address family not supported by protocol
starting jobtracker, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-jobtracker-iZ28c21psoeZ.out
localhost: socket: Address family not supported by protocol
localhost: ssh: connect to host localhost port 22: Address family not supported by protocol
[root@iZ28c21psoeZ bin]#
翻译一下：
警告:$ HADOOP_HOME弃用。
namenode开始,日志/ opt / hadoop-1.2.1 / libexec / . . /日志/ hadoop-root-namenode-iZ28c21psoeZ.out
localhost:套接字:家庭地址不支持的协议
localhost:ssh连接到主机本地主机端口22:家庭地址不支持的协议
localhost:套接字:家庭地址不支持的协议
localhost:ssh连接到主机本地主机端口22:家庭地址不支持的协议
jobtracker开始,日志/ opt / hadoop-1.2.1 / libexec / . . /日志/ hadoop-root-jobtracker-iZ28c21psoeZ.out
localhost:套接字:家庭地址不支持的协议
在修改下代码：
根据日志所示是端口不对，将hadoop的端口改成和服务器的ssh端口一致即可。
在conf/hadoop-env.sh里改下 新增一条 export HADOOP_SSH_OPTS="-p 1234"
在执行一下：
[root@ldy bin]# sh start-all.sh
Warning: $HADOOP_HOME is deprecated.
starting namenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-namenode-ldy.out
localhost: starting datanode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-datanode-ldy.out
localhost: starting secondarynamenode, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-secondarynamenode-ldy.out
starting jobtracker, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-jobtracker-ldy.out
localhost: starting tasktracker, logging to /opt/hadoop-1.2.1/libexec/../logs/hadoop-root-tasktracker-ldy.out
[root@ldy bin]# jps
27054 DataNode
26946 NameNode
27374 TaskTracker
27430 Jps
27250 JobTracker
27165 SecondaryNameNode
ok现在6个端口都起来了，成功。。
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