c语言sscanf函数的用法是什么
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2022-11-28
Linux部署hadoop2.7.7集群
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在CentOS7环境下,hadoop2.7.7集群部署的实战的步骤如下: 机器规划; Linux设置; 创建用户和用户组 SSH免密码设置; 文件下载; Java设置; 创建hadoop要用到的文件夹; hadoop设置; 格式化hdfs; 启动hadoop; 验证hadoop; 接下来就逐步开始吧;
机器规划
本次实战用到了三台CentOS7的机器,身份信息如下所示:
IP地址 | hostname(主机名) | 身份 |
---|---|---|
192.168.119.163 | node0 | NameNode、ResourceManager、HistoryServer |
192.168.119.164 | node1 | DataNode、NodeManager |
192.168.119.165 | node2 | DataNode、NodeManager、SecondaryNameNode |
Linux设置(三台电脑都要做)
修改文件/etc/hostname,将三台电脑的内容分别改为node0、node1、node2; 修改文件/etc/hosts,在尾部增加以下三行内容:
192.168.119.163 node0 192.168.119.164 node1 192.168.119.165 node2
关闭防火墙,并禁止启动:
systemctl stop firewalld.service && systemctl disable firewalld.service
关闭SELINUX,打开文件/etc/selinux/config,找到SELINUX的配置,改为SELINUX=disabled;
创建用户和用户组
执行以下命令创建用户和用户组:
groupadd hadoop && useradd -d /home/hadoop -g hadoop -m hadoop
创建完账号后记得用命令passwd初始化hadoop账号的密码;
SSH免密码设置
node0、node1、node2三台机器之间要设置SSH免密码登录,详细的设置步骤请参考《Linux配置SSH免密码登录(非root账号)》 ;
改用hadoop账号登录
后面在三台机器上的所有操作,都是用hadoop账号进行的,不再使用root账号;
文件下载
将JDK安装文件jdk-8u191-linux-x64.tar.gz下载到hadoop账号的家目录下; 将hadoop安装文件hadoop-2.7.7.tar.gz下载到hadoop账号的家目录下; 下载完毕后,家目录下的内容如下所示:
[hadoop@node0 ~]$ ls ~ hadoop-2.7.7.tar.gz jdk-8u191-linux-x64.tar.gz
JDK设置(三台电脑都要做)
解压jdk-8u191-linux-x64.tar.gz文件:
tar -zxvf ~/jdk-8u191-linux-x64.tar.gz
打开文件~/.bash_profile,在尾部追加以下内容:
export JAVA_HOME=/home/hadoop/jdk1.8.0_191 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH
执行命令source ~/.bash_profile使得JDK设置生效;v执行命令java -version确认设置成功:
[hadoop@node0 ~]$ java -version java version "1.8.0_191" Java(TM) SE Runtime Environment (build 1.8.0_191-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
创建hadoop要用到的文件夹(三台电脑都要做)
创建文件夹,后面hadoop会用到:
mkdir -p ~/work/tmp/dfs/name && mkdir -p ~/work/tmp/dfs/data
hadoop设置
以hadoop账号登录node0; 解压hadoop安装包:
tar -zxvf hadoop-2.7.7.tar.gz
进入目录~/hadoop-2.7.7/etc/hadoop; 依次编辑hadoop-env.sh、mapred-env.sh、yarn-env.sh这三个文件,确保它们的内容中都有JAVA_HOME的正确配置,如下:
export JAVA_HOME=/home/hadoop/jdk1.8.0_191
编辑core-site.xml文件,找到configuration节点,改成以下内容:
编辑hdfs-site.xml文件,找到configuration节点,改成以下内容,把node2配置成sendary namenode:
编辑slaves文件,删除里面的"localhost",增加两行内容:
node1 node2
编辑yarn-site.xml文件,找到configuration节点,改成以下内容:
将文件mapred-site.xml.template改名为mapred-site.xml:
mv mapred-site.xml.template mapred-site.xml
编辑mapred-site.xml文件,找到configuration节点,改成以下内容:
将整个hadoop-2.7.7目录同步到node1的家目录:
scp -r ~/hadoop-2.7.7 hadoop@node1:~/
将整个hadoop-2.7.7目录同步到node2的家目录:
scp -r ~/hadoop-2.7.7 hadoop@node2:~/
格式化hdfs
在node0执行以下命令格式化hdfs:
~/hadoop-2.7.7/bin/hdfs namenode -format
启动hadoop
在node0机器执行以下命令,启动hdfs:
~/hadoop-2.7.7/sbin/start-dfs.sh
在node0机器执行以下命令,启动yarn:
~/hadoop-2.7.7/sbin/start-yarn.sh
在node0机器执行以下命令,启动ResourceManager: ~/hadoop-2.7.7/sbin/yarn-daemon.sh start resourcemanager 在node0机器执行以下命令,启动日志服务: ~/hadoop-2.7.7/sbin/mr-jobhistory-daemon.sh start historyserver 启动成功后,在node0执行jps命令查看java进程,如下:
[hadoop@node0 ~]$ jps 3253 JobHistoryServer 2647 NameNode 3449 Jps 2941 ResourceManager
在node1执行jps命令查看java进程,如下:
[hadoop@node1 ~]$ jps 2176 DataNode 2292 NodeManager 2516 Jps
在node2执行jps命令查看java进程,如下:
[hadoop@node2 ~]$ jps 1991 DataNode 2439 Jps 2090 SecondaryNameNode 2174 NodeManager
至此,hadoop启动成功; 验证hadoop 下面运行一次经典的WorkCount程序来检查hadoop工作是否正常: 以hadoop账号登录node0,在家目录创建文件test.txt,内容如下:
hadoop mapreduce hive hbase spark storm sqoop hadoop hive spark hadoop
在hdfs上创建一个文件夹:
~/hadoop-2.7.7/bin/hdfs dfs -mkdir /input
将test.txt文件上传的hdfs的/input目录下:
~/hadoop-2.7.7/bin/hdfs dfs -put ~/test.txt /input
直接运行hadoop安装包中自带的workcount程序:
~/hadoop-2.7.7/bin/yarn \ jar ~/hadoop-2.7.7/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.7.jar \ wordcount \ /input/test.txt \ /output
控制台输出如下:
[hadoop@node0 ~]$ ~/hadoop-2.7.7/bin/yarn \ > jar ~/hadoop-2.7.7/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.7.jar \ > wordcount \ > /input/test.txt \ > /output 19/02/08 14:34:28 INFO client.RMProxy: Connecting to ResourceManager at node1/192.168.119.164:8032 19/02/08 14:34:29 INFO input.FileInputFormat: Total input paths to process : 1 19/02/08 14:34:29 INFO mapreduce.JobSubmitter: number of splits:1 19/02/08 14:34:29 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1549606965916_0001 19/02/08 14:34:30 INFO impl.YarnClientImpl: Submitted application application_1549606965916_0001 19/02/08 14:34:30 INFO mapreduce.Job: The url to track the job: http://node1:8088/proxy/application_1549606965916_0001/ 19/02/08 14:34:30 INFO mapreduce.Job: Running job: job_1549606965916_0001 19/02/08 14:34:36 INFO mapreduce.Job: Job job_1549606965916_0001 running in uber mode : false 19/02/08 14:34:36 INFO mapreduce.Job: map 0% reduce 0% 19/02/08 14:34:41 INFO mapreduce.Job: map 100% reduce 0% 19/02/08 14:34:46 INFO mapreduce.Job: map 100% reduce 100% 19/02/08 14:34:46 INFO mapreduce.Job: Job job_1549606965916_0001 completed successfully 19/02/08 14:34:46 INFO mapreduce.Job: Counters: 49 File System Counters FILE: Number of bytes read=94 FILE: Number of bytes written=245525 FILE: Number of read operations=0 FILE: Number of large read operations=0 FILE: Number of write operations=0 HDFS: Number of bytes read=168 HDFS: Number of bytes written=60 HDFS: Number of read operations=6 HDFS: Number of large read operations=0 HDFS: Number of write operations=2 Job Counters Launched map tasks=1 Launched reduce tasks=1 Data-local map tasks=1 Total time spent by all maps in occupied slots (ms)=2958 Total time spent by all reduces in occupied slots (ms)=1953 Total time spent by all map tasks (ms)=2958 Total time spent by all reduce tasks (ms)=1953 Total vcore-milliseconds taken by all map tasks=2958 Total vcore-milliseconds taken by all reduce tasks=1953 Total megabyte-milliseconds taken by all map tasks=3028992 Total megabyte-milliseconds taken by all reduce tasks=1999872 Map-Reduce Framework Map input records=4 Map output records=11 Map output bytes=115 Map output materialized bytes=94 Input split bytes=97 Combine input records=11 Combine output records=7 Reduce input groups=7 Reduce shuffle bytes=94 Reduce input records=7 Reduce output records=7 Spilled Records=14 Shuffled Maps =1 Failed Shuffles=0 Merged Map outputs=1 GC time elapsed (ms)=93 CPU time spent (ms)=1060 Physical memory (bytes) snapshot=430956544 Virtual memory (bytes) snapshot=4203192320 Total committed heap usage (bytes)=285212672 Shuffle Errors BAD_ID=0 CONNECTION=0 IO_ERROR=0 WRONG_LENGTH=0 WRONG_MAP=0 WRONG_REDUCE=0 File Input Format Counters Bytes Read=71 File Output Format Counters Bytes Written=60
查看输出结果:
~/hadoop-2.7.7/bin/hdfs dfs -ls /output
可见hdfs的/output目录下,有两个文件:
[hadoop@node0 ~]$ ~/hadoop-2.7.7/bin/hdfs dfs -ls /output Found 2 items -rw-r--r-- 3 hadoop supergroup 0 2019-02-08 14:34 /output/_SUCCESS -rw-r--r-- 3 hadoop supergroup 60 2019-02-08 14:34 /output/part-r-00000
看一下文件part-r-00000的内容:
[hadoop@node0 ~]$ ~/hadoop-2.7.7/bin/hdfs dfs -cat /output/part-r-00000 hadoop 3 hbase 1 hive 2 mapreduce 1 spark 2 sqoop 1 storm 1
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