(一)通过UI界面查看Hadoop运行状态
·Hadoop集群正常启动后,它默认开放了两个端口9870
和8088
,分别用于监控HDFS集群和YARN集群。通过UI界面可以方便地进行集群的管理和查看,只需要在本地操作系统的浏览器输入集群服务的IP和对应的端口号即可访问。
1、hadoop2和hadoop3端口区别表
2、查看HDFS集群状态
·在浏览器里访问http://master1:9870
·
不能通过主机名master1加端口9870
的方式,原因在于没有在hosts
文件里IP与主机名的映射,现在只能通过IP地址加端口号的方式访问:http://192.168.219.19:9870(地址为实例中的浮动ip)
如果无法加载,查看防火墙是否关闭
·执行命令:systemctl status firewalld
`临时关闭:systemctl stop firewalld
·永久关闭:systemctl disable firewalld
·修改宿主机的C:\Windows\System32\drivers\etc\hosts
文件,增加hadoop集群主机名与IP地址的映射
·此时,访问http://master1:9870
,从图中可以看出HDFS集群状态显示正常。
·单击导航条上的【Datanodes】,查看数据节点信息
·点开【Utilities】下拉菜单,选择【Browse the file system】
·此时HDFS上什么都无
·在HDFS上创建一个目录BigData
,执行命令:hdfs dfs -mkdir /BigData
·在Hadoop WebUI界面查看刚才创建的目录
3、查看YARN集群状态
·访问http://master1:8088/cluster
,从图中可以看出YARN集群状态显示正常。
·单击[About]链接
(二)Hadoop集群初体验 —— 词频统计
1、启动Hadoop集群
·在master虚拟机上执行命令:start-all.sh
2、在虚拟机上准备文件
·在master虚拟机上创建test.txt
文件
3、文件上传到HDFS指定目录
·上传test.txt
文件到HDFS的/BigData
目录
·利用HDFS命令查看文件是否上传成功
·利用Hadoop WebUI查看文件是否上传成功
4、运行词频统计程序的jar包
·查看Hadoop自带示例的jar包
·执行命令:cd $HADOOP_HOME/share/hadoop/mapreduce
·执行:ll
·执行命令:hadoop jar ./hadoop-mapreduce-examples-3.3.4.jar wordcount /BigData/test.txt /wc_result
[root@master mapreduce]# hadoop jar ./hadoop-mapreduce-examples-3.3.4.jar wordcount /BigData/test.txt /wc_result
2022-10-04 12:40:30,559 INFO client.DefaultNoHARMFailoverProxyProvider: Connecting to ResourceManager at master/192.168.1.101:8032
2022-10-04 12:40:31,501 INFO mapreduce.JobResourceUploader: Disabling Erasure Coding for path: /tmp/hadoop-yarn/staging/root/.staging/job_1664901602347_0001
2022-10-04 12:40:32,416 INFO input.FileInputFormat: Total input files to process : 1
2022-10-04 12:40:32,911 INFO mapreduce.JobSubmitter: number of splits:1
2022-10-04 12:40:33,204 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1664901602347_0001
2022-10-04 12:40:33,205 INFO mapreduce.JobSubmitter: Executing with tokens: []
2022-10-04 12:40:33,418 INFO conf.Configuration: resource-types.xml not found
2022-10-04 12:40:33,418 INFO resource.ResourceUtils: Unable to find 'resource-types.xml'.
2022-10-04 12:40:33,939 INFO impl.YarnClientImpl: Submitted application application_1664901602347_0001
2022-10-04 12:40:33,974 INFO mapreduce.Job: The url to track the job: http://master:8088/proxy/application_1664901602347_0001/
2022-10-04 12:40:33,974 INFO mapreduce.Job: Running job: job_1664901602347_0001
2022-10-04 12:40:45,146 INFO mapreduce.Job: Job job_1664901602347_0001 running in uber mode : false
2022-10-04 12:40:45,147 INFO mapreduce.Job: map 0% reduce 0%
2022-10-04 12:40:52,319 INFO mapreduce.Job: map 100% reduce 0%
2022-10-04 12:40:59,512 INFO mapreduce.Job: map 100% reduce 100%
2022-10-04 12:41:00,531 INFO mapreduce.Job: Job job_1664901602347_0001 completed successfully
2022-10-04 12:41:00,694 INFO mapreduce.Job: Counters: 54
File System Counters
FILE: Number of bytes read=98
FILE: Number of bytes written=552153
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
HDFS: Number of bytes read=191
HDFS: Number of bytes written=60
HDFS: Number of read operations=8
HDFS: Number of large read operations=0
HDFS: Number of write operations=2
HDFS: Number of bytes read erasure-coded=0
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)=4860
Total time spent by all reduces in occupied slots (ms)=5021
Total time spent by all map tasks (ms)=4860
Total time spent by all reduce tasks (ms)=5021
Total vcore-milliseconds taken by all map tasks=4860
Total vcore-milliseconds taken by all reduce tasks=5021
Total megabyte-milliseconds taken by all map tasks=4976640
Total megabyte-milliseconds taken by all reduce tasks=5141504
Map-Reduce Framework
Map input records=6
Map output records=16
Map output bytes=154
Map output materialized bytes=98
Input split bytes=100
Combine input records=16
Combine output records=8
Reduce input groups=8
Reduce shuffle bytes=98
Reduce input records=8
Reduce output records=8
Spilled Records=16
Shuffled Maps =1
Failed Shuffles=0
Merged Map outputs=1
GC time elapsed (ms)=235
CPU time spent (ms)=1180
Physical memory (bytes) snapshot=318394368
Virtual memory (bytes) snapshot=5478535168
Total committed heap usage (bytes)=141692928
Peak Map Physical memory (bytes)=211103744
Peak Map Virtual memory (bytes)=2734690304
Peak Reduce Physical memory (bytes)=107290624
Peak Reduce Virtual memory (bytes)=2743844864
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=91
File Output Format Counters
Bytes Written=60
·查看输出目录/wc_result
,执行命令:hdfs dfs -ls /wc_result
·查看词频统计结果,执行命令:hdfs dfs -cat /wc_result/*
5、在HDFS集群UI界面查看结果文件
·在HDFS集群UI界面,查看/wc_result
目录
·单击结果文件part-r-00000
·单击【Download】,下载结果文件到本地
·利用记事本打开该文件
6、在YARN集群UI界面查看程序运行状态
·访问http://master:8088
,看到FINISHED
和SUCCEEDED
·单击应用标识application_1664901602347_0001
,查看应用的运行详情