hadoop伪分布式搭建

hadoop搭建方式有三种：
Local (Standalone) Mode ——本地模式
Pseudo-Distributed Mode ——伪分布式
Fully-Distributed Mode ——分布式

伪分布式集群的搭建是hadoop入门最先接触的模式：
环境：

      jdk：jdk1.7.0_79
      hadoop： hadoop-2.5.0
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需自定义配置的xml文件：

HDFS:core-site.xml,hdfs-site.xml
TARN:yarn-site.xml
MAPREDUCE:mpred-site.xml
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———-

配置文件 hadoop-2.5.0/etc/hadoop/core-site.xml ：
设置namenode RPC交互端口，在本机地址

配置文件 hadoop-2.5.0/etc/hadoop/hdfs-site.xml
hdfs数据块的复制份数（备份数据），默认3，但为分布式搭建我们只有一台机器，所以设定为1就可以

配置文件 hadoop-2.5.0/etc/hadoop/yarn-site.xml

增加配置文件 hadoop-2.5.0/etc/mapred-site.xml
把hdfs加载到yarn上，下面那个是历史端口，，

以上配置信息配置完之后基本就可以启动了
启动hdfs：namenode，datanode，


启动yarn：resourcemanager，namemanager

启动之后使用JPS命令查看

命令出现以下内容就表示启动成功,可以使用
主机名+50070，主机名+8088，，，两个端口来查看web界面


出现以上两个界面说明启动成功，伪分布是搭建成功！

测试：
准备一个本地input文本文件，上传到hadoop，并通过wordcount测试运行查看结果
上传
/opt/datas/wc.input01

通过web可以查看到红线的地址连接的目录都是自己在hdfs中创建的，在这个目录中我们能看到刚才上传到文件wc.input01

测试
通过以下命令使用worddount来测试运行这个文件，并输出结果到output01的文件中

[hadoop-hao@hadoop-study hadoop-2.5.0]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/hadoopTest/inputFile/wc.input01 /user/hadoopTest/inputFile/wc.output01
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> [hadoop-hao@hadoop-study hadoop-2.5.0]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/hadoopTest/inputFile/wc.input01 /user/hadoopTest/inputFile/wc.output01
16/01/12 10:09:45 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
16/01/12 10:09:46 INFO client.RMProxy: Connecting to ResourceManager at hadoop-study.com/192.168.212.129:8032
16/01/12 10:09:48 INFO input.FileInputFormat: Total input paths to process : 1
16/01/12 10:09:48 INFO mapreduce.JobSubmitter: number of splits:1
16/01/12 10:09:48 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1452561625006_0001
16/01/12 10:09:49 INFO impl.YarnClientImpl: Submitted application application_1452561625006_0001
16/01/12 10:09:49 INFO mapreduce.Job: The url to track the job: http://hadoop-study.com:8088/proxy/application_1452561625006_0001/
16/01/12 10:09:49 INFO mapreduce.Job: Running job: job_1452561625006_0001
16/01/12 10:10:04 INFO mapreduce.Job: Job job_1452561625006_0001 running in uber mode : false
16/01/12 10:10:04 INFO mapreduce.Job:  map 0% reduce 0%
16/01/12 10:10:17 INFO mapreduce.Job:  map 100% reduce 0%
16/01/12 10:10:35 INFO mapreduce.Job:  map 100% reduce 100%
16/01/12 10:10:36 INFO mapreduce.Job: Job job_1452561625006_0001 completed successfully
16/01/12 10:10:36 INFO mapreduce.Job: Counters: 49
    File System Counters
        FILE: Number of bytes read=641
        FILE: Number of bytes written=195383
        FILE: Number of read operations=0
        FILE: Number of large read operations=0
        FILE: Number of write operations=0
        HDFS: Number of bytes read=622
        HDFS: Number of bytes written=491
        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)=11588
        Total time spent by all reduces in occupied slots (ms)=14533
        Total time spent by all map tasks (ms)=11588
        Total time spent by all reduce tasks (ms)=14533
        Total vcore-seconds taken by all map tasks=11588
        Total vcore-seconds taken by all reduce tasks=14533
        Total megabyte-seconds taken by all map tasks=11866112
        Total megabyte-seconds taken by all reduce tasks=14881792
    Map-Reduce Framework
        Map input records=1
        Map output records=52
        Map output bytes=700
        Map output materialized bytes=641
        Input split bytes=130
        Combine input records=52
        Combine output records=36
        Reduce input groups=36
        Reduce shuffle bytes=641
        Reduce input records=36
        Reduce output records=36
        Spilled Records=72
        Shuffled Maps =1
        Failed Shuffles=0
        Merged Map outputs=1
        GC time elapsed (ms)=167
        CPU time spent (ms)=1940
        Physical memory (bytes) snapshot=304365568
        Virtual memory (bytes) snapshot=1680384000
        Total committed heap usage (bytes)=136450048
    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=492
    File Output Format Counters 
        Bytes Written=491
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注意：输出结果的文件是在运行时系统自行创建的，在运行前不得有相同名的文件

在运行过程中我们可以在yarn的web界面看到进程运行的情况

通过bin/hdfs dfs -cat /user/hadoopTest/inputFile/wc.output01/pa*来输出查看结果，我们能看到输出的结果中各单词的数量

以上就是hadoop伪分布式搭建及测试的过程