松江新城建设集团有限公司网站/网络推广技巧

上一篇已经写了 MapReduce之WordCount案例云服务器编码（含完整源码及实现），本地编码只是在原来的基础上做了一点改动。
这里只讲改动的几个点：
上篇文章链接： MapReduce之WordCount案例云服务器编码（含完整源码及实现）

Windows版Hadoop资源 hadoop-2.6.0-cdh5.14.0：
链接：https://pan.baidu.com/s/1cRhLvHPthmc6KM2vRqzSDQ
提取码：u116

一.改动点：

 //集群运行模式，从hdfs上面读取文件
//TextInputFormat.addInputPath(job,new Path("hdfs://hadooptest:8020/xu"));//使用本地模式来运行，从本地磁盘读取文件进行处理
TextInputFormat.addInputPath(job,new Path("file:///C:\\xu\\xuexi\\hadoop\\test\\wordcount\\input"));..........
..........//TextOutputFormat.setOutputPath(job,new Path("hdfs://hadooptest:8020/wordcountout"));//使用本地模式来运行
TextOutputFormat.setOutputPath(job,new Path("file:///C:\\xu\\xuexi\\hadoop\\test\\wordcount\\output"));

其他代码与云上代码一致。

2. windows版Hadoop的配置：

2.1 将下载的软件解压到某个目录，配置环境变量：

变量名：HADOOP_HOME
变量值：C:\xu\xuexi\hadoop\hadoop-2.6.0-cdh5.14.0
在PATH里添加：%HADOOP_HOME%\bin

2.2 常见问题：
运行程序出现的问题有：

C:\xu\xuexi\soft\jdk1.8\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5\lib\idea_rt.jar=63044:C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath C:\xu\xuexi\soft\jdk1.8\jre\lib\charsets.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\deploy.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\access-bridge-64.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\cldrdata.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\dnsns.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\jaccess.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\jfxrt.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\localedata.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\nashorn.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunec.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunjce_provider.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunmscapi.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunpkcs11.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\zipfs.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\javaws.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jce.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jfr.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jfxswt.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jsse.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\management-agent.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\plugin.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\resources.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\rt.jar;C:\xu\xuexi\workspace\hdfsDemo\target\classes;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-client\2.6.0-mr1-cdh5.14.0\hadoop-client-2.6.0-mr1-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-core\2.6.0-mr1-cdh5.14.0\hadoop-core-2.6.0-mr1-cdh5.14.0.jar;C:\Users\25308\.m2\repository\hsqldb\hsqldb\1.8.0.10\hsqldb-1.8.0.10.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-common\2.6.0-cdh5.14.0\hadoop-common-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-annotations\2.6.0-cdh5.14.0\hadoop-annotations-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\com\google\guava\guava\11.0.2\guava-11.0.2.jar;C:\Users\25308\.m2\repository\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;C:\Users\25308\.m2\repository\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;C:\Users\25308\.m2\repository\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;C:\Users\25308\.m2\repository\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;C:\Users\25308\.m2\repository\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;C:\Users\25308\.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\25308\.m2\repository\commons-net\commons-net\3.1\commons-net-3.1.jar;C:\Users\25308\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\25308\.m2\repository\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;C:\Users\25308\.m2\repository\org\mortbay\jetty\jetty\6.1.26.cloudera.4\jetty-6.1.26.cloudera.4.jar;C:\Users\25308\.m2\repository\org\mortbay\jetty\jetty-util\6.1.26.cloudera.4\jetty-util-6.1.26.cloudera.4.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-json\1.9\jersey-json-1.9.jar;C:\Users\25308\.m2\repository\org\codehaus\jettison\jettison\1.1\jettison-1.1.jar;C:\Users\25308\.m2\repository\com\sun\xml\bind\jaxb-impl\2.2.3-1\jaxb-impl-2.2.3-1.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-jaxrs\1.8.3\jackson-jaxrs-1.8.3.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-xc\1.8.3\jackson-xc-1.8.3.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-server\1.9\jersey-server-1.9.jar;C:\Users\25308\.m2\repository\asm\asm\3.1\asm-3.1.jar;C:\Users\25308\.m2\repository\tomcat\jasper-compiler\5.5.23\jasper-compiler-5.5.23.jar;C:\Users\25308\.m2\repository\tomcat\jasper-runtime\5.5.23\jasper-runtime-5.5.23.jar;C:\Users\25308\.m2\repository\javax\servlet\jsp\jsp-api\2.1\jsp-api-2.1.jar;C:\Users\25308\.m2\repository\commons-el\commons-el\1.0\commons-el-1.0.jar;C:\Users\25308\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\25308\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\25308\.m2\repository\net\java\dev\jets3t\jets3t\0.9.0\jets3t-0.9.0.jar;C:\Users\25308\.m2\repository\org\apache\httpcomponents\httpclient\4.1.2\httpclient-4.1.2.jar;C:\Users\25308\.m2\repository\org\apache\httpcomponents\httpcore\4.1.2\httpcore-4.1.2.jar;C:\Users\25308\.m2\repository\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;C:\Users\25308\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\25308\.m2\repository\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;C:\Users\25308\.m2\repository\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;C:\Users\25308\.m2\repository\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;C:\Users\25308\.m2\repository\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;C:\Users\25308\.m2\repository\org\slf4j\slf4j-api\1.7.5\slf4j-api-1.7.5.jar;C:\Users\25308\.m2\repository\org\slf4j\slf4j-log4j12\1.7.5\slf4j-log4j12-1.7.5.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-core-asl\1.8.8\jackson-core-asl-1.8.8.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-mapper-asl\1.8.8\jackson-mapper-asl-1.8.8.jar;C:\Users\25308\.m2\repository\org\apache\avro\avro\1.7.6-cdh5.14.0\avro-1.7.6-cdh5.14.0.jar;C:\Users\25308\.m2\repository\com\thoughtworks\paranamer\paranamer\2.3\paranamer-2.3.jar;C:\Users\25308\.m2\repository\org\xerial\snappy\snappy-java\1.0.4.1\snappy-java-1.0.4.1.jar;C:\Users\25308\.m2\repository\com\google\protobuf\protobuf-java\2.5.0\protobuf-java-2.5.0.jar;C:\Users\25308\.m2\repository\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-auth\2.6.0-cdh5.14.0\hadoop-auth-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\directory\server\apacheds-kerberos-codec\2.0.0-M15\apacheds-kerberos-codec-2.0.0-M15.jar;C:\Users\25308\.m2\repository\org\apache\directory\server\apacheds-i18n\2.0.0-M15\apacheds-i18n-2.0.0-M15.jar;C:\Users\25308\.m2\repository\org\apache\directory\api\api-asn1-api\1.0.0-M20\api-asn1-api-1.0.0-M20.jar;C:\Users\25308\.m2\repository\org\apache\directory\api\api-util\1.0.0-M20\api-util-1.0.0-M20.jar;C:\Users\25308\.m2\repository\org\apache\curator\curator-framework\2.7.1\curator-framework-2.7.1.jar;C:\Users\25308\.m2\repository\com\jcraft\jsch\0.1.42\jsch-0.1.42.jar;C:\Users\25308\.m2\repository\org\apache\curator\curator-client\2.7.1\curator-client-2.7.1.jar;C:\Users\25308\.m2\repository\org\apache\curator\curator-recipes\2.7.1\curator-recipes-2.7.1.jar;C:\Users\25308\.m2\repository\com\google\code\findbugs\jsr305\3.0.0\jsr305-3.0.0.jar;C:\Users\25308\.m2\repository\org\apache\htrace\htrace-core4\4.0.1-incubating\htrace-core4-4.0.1-incubating.jar;C:\Users\25308\.m2\repository\org\apache\zookeeper\zookeeper\3.4.5-cdh5.14.0\zookeeper-3.4.5-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\commons\commons-compress\1.4.1\commons-compress-1.4.1.jar;C:\Users\25308\.m2\repository\org\tukaani\xz\1.0\xz-1.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-hdfs\2.6.0-cdh5.14.0\hadoop-hdfs-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;C:\Users\25308\.m2\repository\io\netty\netty\3.10.5.Final\netty-3.10.5.Final.jar;C:\Users\25308\.m2\repository\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;C:\Users\25308\.m2\repository\xerces\xercesImpl\2.9.1\xercesImpl-2.9.1.jar;C:\Users\25308\.m2\repository\xml-apis\xml-apis\1.3.04\xml-apis-1.3.04.jar;C:\Users\25308\.m2\repository\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-core\2.6.0-cdh5.14.0\hadoop-mapreduce-client-core-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-yarn-common\2.6.0-cdh5.14.0\hadoop-yarn-common-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-yarn-api\2.6.0-cdh5.14.0\hadoop-yarn-api-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\javax\xml\bind\jaxb-api\2.2.2\jaxb-api-2.2.2.jar;C:\Users\25308\.m2\repository\javax\xml\stream\stax-api\1.0-2\stax-api-1.0-2.jar;C:\Users\25308\.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-client\1.9\jersey-client-1.9.jar;C:\Users\25308\.m2\repository\com\google\inject\guice\3.0\guice-3.0.jar;C:\Users\25308\.m2\repository\javax\inject\javax.inject\1\javax.inject-1.jar;C:\Users\25308\.m2\repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;C:\Users\25308\.m2\repository\com\sun\jersey\contribs\jersey-guice\1.9\jersey-guice-1.9.jar;C:\Users\25308\.m2\repository\com\google\inject\extensions\guice-servlet\3.0\guice-servlet-3.0.jar com.xu.bd.JobMain
19/11/06 22:31:41 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/11/06 22:31:41 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.createDirectoryWithMode0(Ljava/lang/String;I)Vat org.apache.hadoop.io.nativeio.NativeIO$Windows.createDirectoryWithMode0(Native Method)at org.apache.hadoop.io.nativeio.NativeIO$Windows.createDirectoryWithMode(NativeIO.java:524)at org.apache.hadoop.fs.RawLocalFileSystem.mkOneDirWithMode(RawLocalFileSystem.java:465)at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission(RawLocalFileSystem.java:518)at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:496)at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:316)at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:126)at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:982)at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:976)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:422)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1917)at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:976)at org.apache.hadoop.mapreduce.Job.submit(Job.java:582)at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:612)at com.xu.bd.JobMain.run(JobMain.java:66)at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)at com.xu.bd.JobMain.main(JobMain.java:75)Process finished with exit code 1

把hadood.dll和winutils.exe复制到C:\Windows\System32目录下即可！

问题2：

C:\xu\xuexi\soft\jdk1.8\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5\lib\idea_rt.jar=63300:C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath C:\xu\xuexi\soft\jdk1.8\jre\lib\charsets.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\deploy.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\access-bridge-64.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\cldrdata.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\dnsns.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\jaccess.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\jfxrt.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\localedata.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\nashorn.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunec.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunjce_provider.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunmscapi.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\sunpkcs11.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\ext\zipfs.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\javaws.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jce.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jfr.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jfxswt.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\jsse.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\management-agent.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\plugin.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\resources.jar;C:\xu\xuexi\soft\jdk1.8\jre\lib\rt.jar;C:\xu\xuexi\workspace\hdfsDemo\target\classes;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-client\2.6.0-mr1-cdh5.14.0\hadoop-client-2.6.0-mr1-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-core\2.6.0-mr1-cdh5.14.0\hadoop-core-2.6.0-mr1-cdh5.14.0.jar;C:\Users\25308\.m2\repository\hsqldb\hsqldb\1.8.0.10\hsqldb-1.8.0.10.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-common\2.6.0-cdh5.14.0\hadoop-common-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\org\apache\hadoop\hadoop-annotations\2.6.0-cdh5.14.0\hadoop-annotations-2.6.0-cdh5.14.0.jar;C:\Users\25308\.m2\repository\com\google\guava\guava\11.0.2\guava-11.0.2.jar;C:\Users\25308\.m2\repository\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;C:\Users\25308\.m2\repository\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;C:\Users\25308\.m2\repository\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;C:\Users\25308\.m2\repository\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;C:\Users\25308\.m2\repository\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;C:\Users\25308\.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\25308\.m2\repository\commons-net\commons-net\3.1\commons-net-3.1.jar;C:\Users\25308\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\25308\.m2\repository\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;C:\Users\25308\.m2\repository\org\mortbay\jetty\jetty\6.1.26.cloudera.4\jetty-6.1.26.cloudera.4.jar;C:\Users\25308\.m2\repository\org\mortbay\jetty\jetty-util\6.1.26.cloudera.4\jetty-util-6.1.26.cloudera.4.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-json\1.9\jersey-json-1.9.jar;C:\Users\25308\.m2\repository\org\codehaus\jettison\jettison\1.1\jettison-1.1.jar;C:\Users\25308\.m2\repository\com\sun\xml\bind\jaxb-impl\2.2.3-1\jaxb-impl-2.2.3-1.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-jaxrs\1.8.3\jackson-jaxrs-1.8.3.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-xc\1.8.3\jackson-xc-1.8.3.jar;C:\Users\25308\.m2\repository\com\sun\jersey\jersey-server\1.9\jersey-server-1.9.jar;C:\Users\25308\.m2\repository\asm\asm\3.1\asm-3.1.jar;C:\Users\25308\.m2\repository\tomcat\jasper-compiler\5.5.23\jasper-compiler-5.5.23.jar;C:\Users\25308\.m2\repository\tomcat\jasper-runtime\5.5.23\jasper-runtime-5.5.23.jar;C:\Users\25308\.m2\repository\javax\servlet\jsp\jsp-api\2.1\jsp-api-2.1.jar;C:\Users\25308\.m2\repository\commons-el\commons-el\1.0\commons-el-1.0.jar;C:\Users\25308\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\25308\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\25308\.m2\repository\net\java\dev\jets3t\jets3t\0.9.0\jets3t-0.9.0.jar;C:\Users\25308\.m2\repository\org\apache\httpcomponents\httpclient\4.1.2\httpclient-4.1.2.jar;C:\Users\25308\.m2\repository\org\apache\httpcomponents\httpcore\4.1.2\httpcore-4.1.2.jar;C:\Users\25308\.m2\repository\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;C:\Users\25308\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\25308\.m2\repository\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;C:\Users\25308\.m2\repository\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;C:\Users\25308\.m2\repository\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;C:\Users\25308\.m2\repository\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;C:\Users\25308\.m2\repository\org\slf4j\slf4j-api\1.7.5\slf4j-api-1.7.5.jar;C:\Users\25308\.m2\repository\org\slf4j\slf4j-log4j12\1.7.5\slf4j-log4j12-1.7.5.jar;C:\Users\25308\.m2\repository\org\codehaus\jackson\jackson-core-asl\1.8.8\jackson-core-asl-1.8.8.jar;C:\Users\25308\.m2\repository\org\codehaus\jacks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com.xu.bd.JobMain
19/11/06 22:38:22 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/11/06 22:38:22 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/11/06 22:38:22 WARN mapred.JobClient: No job jar file set.  User classes may not be found. See JobConf(Class) or JobConf#setJar(String).
19/11/06 22:38:22 INFO mapred.JobClient: Cleaning up the staging area file:/tmp/hadoop-25308/mapred/staging/25308921499379/.staging/job_local921499379_0001
19/11/06 22:38:22 WARN security.UserGroupInformation: PriviledgedActionException as:25308 (auth:SIMPLE) cause:org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory file:/C:/xu/xuexi/hadoop/test/wordcount/output already exists
Exception in thread "main" org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory file:/C:/xu/xuexi/hadoop/test/wordcount/output already existsat org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:132)at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:1015)at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:976)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:422)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1917)at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:976)at org.apache.hadoop.mapreduce.Job.submit(Job.java:582)at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:612)at com.xu.bd.JobMain.run(JobMain.java:66)at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)at com.xu.bd.JobMain.main(JobMain.java:75)Process finished with exit code 1

原因：文件已经存在，删除即可！

运行成功的结果：

C:\xu\xuexi\soft\jdk1.8\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5\lib\idea_rt.jar=63360:C:\Program Files\JetBrains\IntelliJ IDEA 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath 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com.xu.bd.JobMain
19/11/06 22:40:59 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
19/11/06 22:40:59 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
19/11/06 22:40:59 WARN mapred.JobClient: No job jar file set.  User classes may not be found. See JobConf(Class) or JobConf#setJar(String).
19/11/06 22:40:59 INFO input.FileInputFormat: Total input paths to process : 1
19/11/06 22:40:59 INFO mapred.LocalJobRunner: OutputCommitter set in config null
19/11/06 22:40:59 INFO mapred.JobClient: Running job: job_local693279646_0001
19/11/06 22:40:59 INFO mapred.LocalJobRunner: OutputCommitter is org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
19/11/06 22:40:59 INFO mapred.LocalJobRunner: Waiting for map tasks
19/11/06 22:40:59 INFO mapred.LocalJobRunner: Starting task: attempt_local693279646_0001_m_000000_0
19/11/06 22:40:59 WARN mapreduce.Counters: Group org.apache.hadoop.mapred.Task$Counter is deprecated. Use org.apache.hadoop.mapreduce.TaskCounter instead
19/11/06 22:40:59 INFO mapred.Task:  Using ResourceCalculatorPlugin : null
19/11/06 22:40:59 INFO mapred.MapTask: Processing split: file:/C:/xu/xuexi/hadoop/test/wordcount/input/wordcount.txt:0+115
19/11/06 22:40:59 INFO mapred.MapTask: Map output collector class = org.apache.hadoop.mapred.MapTask$MapOutputBuffer
19/11/06 22:40:59 INFO mapred.MapTask: io.sort.mb = 100
19/11/06 22:40:59 INFO mapred.MapTask: data buffer = 79691776/99614720
19/11/06 22:40:59 INFO mapred.MapTask: record buffer = 262144/327680
19/11/06 22:40:59 INFO mapred.LocalJobRunner: 
19/11/06 22:40:59 INFO mapred.MapTask: Starting flush of map output
19/11/06 22:40:59 INFO mapred.MapTask: Finished spill 0
19/11/06 22:40:59 INFO mapred.Task: Task:attempt_local693279646_0001_m_000000_0 is done. And is in the process of commiting
19/11/06 22:40:59 INFO mapred.LocalJobRunner: 
19/11/06 22:40:59 INFO mapred.Task: Task 'attempt_local693279646_0001_m_000000_0' done.
19/11/06 22:40:59 INFO mapred.LocalJobRunner: Finishing task: attempt_local693279646_0001_m_000000_0
19/11/06 22:40:59 INFO mapred.LocalJobRunner: Map task executor complete.
19/11/06 22:40:59 WARN mapreduce.Counters: Group org.apache.hadoop.mapred.Task$Counter is deprecated. Use org.apache.hadoop.mapreduce.TaskCounter instead
19/11/06 22:40:59 INFO mapred.Task:  Using ResourceCalculatorPlugin : null
19/11/06 22:40:59 INFO mapred.LocalJobRunner: 
19/11/06 22:40:59 INFO mapred.Merger: Merging 1 sorted segments
19/11/06 22:40:59 INFO mapred.Merger: Down to the last merge-pass, with 1 segments left of total size: 218 bytes
19/11/06 22:40:59 INFO mapred.LocalJobRunner: 
19/11/06 22:40:59 INFO mapred.Task: Task:attempt_local693279646_0001_r_000000_0 is done. And is in the process of commiting
19/11/06 22:40:59 INFO mapred.LocalJobRunner: 
19/11/06 22:40:59 INFO mapred.Task: Task attempt_local693279646_0001_r_000000_0 is allowed to commit now
19/11/06 22:40:59 INFO output.FileOutputCommitter: Saved output of task 'attempt_local693279646_0001_r_000000_0' to file:/C:/xu/xuexi/hadoop/test/wordcount/output
19/11/06 22:40:59 INFO mapred.LocalJobRunner: reduce > reduce
19/11/06 22:40:59 INFO mapred.Task: Task 'attempt_local693279646_0001_r_000000_0' done.
19/11/06 22:41:00 INFO mapred.JobClient:  map 100% reduce 100%
19/11/06 22:41:00 INFO mapred.JobClient: Job complete: job_local693279646_0001
19/11/06 22:41:00 INFO mapred.JobClient: Counters: 17
19/11/06 22:41:00 INFO mapred.JobClient:   File System Counters
19/11/06 22:41:00 INFO mapred.JobClient:     FILE: Number of bytes read=808
19/11/06 22:41:00 INFO mapred.JobClient:     FILE: Number of bytes written=340800
19/11/06 22:41:00 INFO mapred.JobClient:     FILE: Number of read operations=0
19/11/06 22:41:00 INFO mapred.JobClient:     FILE: Number of large read operations=0
19/11/06 22:41:00 INFO mapred.JobClient:     FILE: Number of write operations=0
19/11/06 22:41:00 INFO mapred.JobClient:   Map-Reduce Framework
19/11/06 22:41:00 INFO mapred.JobClient:     Map input records=9
19/11/06 22:41:00 INFO mapred.JobClient:     Map output records=18
19/11/06 22:41:00 INFO mapred.JobClient:     Map output bytes=180
19/11/06 22:41:00 INFO mapred.JobClient:     Input split bytes=124
19/11/06 22:41:00 INFO mapred.JobClient:     Combine input records=0
19/11/06 22:41:00 INFO mapred.JobClient:     Combine output records=0
19/11/06 22:41:00 INFO mapred.JobClient:     Reduce input groups=8
19/11/06 22:41:00 INFO mapred.JobClient:     Reduce shuffle bytes=0
19/11/06 22:41:00 INFO mapred.JobClient:     Reduce input records=18
19/11/06 22:41:00 INFO mapred.JobClient:     Reduce output records=8
19/11/06 22:41:00 INFO mapred.JobClient:     Spilled Records=36
19/11/06 22:41:00 INFO mapred.JobClient:     Total committed heap usage (bytes)=514850816Process finished with exit code 0

完！