【从零开始写MapReduce】四处是坑

痛定思痛。 2022-12-10 04:51 73阅读 0赞

# 本地安装jdk1.8 #

下载地址 [https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html][https_www.oracle.com_java_technologies_javase_javase-jdk8-downloads.html]

# 本地下载安装idea编辑器你 #

# 配置本地maven #

更改为阿里源

# 写入配置pom #

reimport

# 下载对应版本的hadoop.dll #

[下载地址][Link 1]  
如果不添加就会报错  
[还有一个地址更全一些][Link 2]

Exception in thread "main" java.lang.NullPointerException
    	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
    	at org.apache.hadoop.util.Shell.runCommand(Shell.java:482)
    	at org.apache.hadoop.util.Shell.run(Shell.java:455)
    	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:715)
    	at org.apache.hadoop.util.Shell.execCommand(Shell.java:808)
    	at org.apache.hadoop.util.Shell.execCommand(Shell.java:791)
    	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:656)
    	at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:444)
    	at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:293)
    	at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133)
    	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:437)
    	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1296)
    	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1293)
    	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:1628)
    	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1293)
    	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1314)
    	at driver.main(driver.java:37)

# 又报错了 #

Exception in thread "main" java.lang.IllegalAccessError: tried to access method com.google.common.base.Stopwatch.<init>()V from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat
    	at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:379)
    	at org.apache.hadoop.mapreduce.JobSubmitter.writeNewSplits(JobSubmitter.java:597)
    	at org.apache.hadoop.mapreduce.JobSubmitter.writeSplits(JobSubmitter.java:614)
    	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:492)
    	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1296)
    	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1293)
    	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:1628)
    	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1293)
    	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1314)
    	at driver.main(driver.java:37)

仔细一看我用的是cdh版本的hadoop集群，但是maven中配置的是源码的，改一下maven的配置版本，顺便带上cdh的源

<repository>
                <id>cloudera-releases</id>
                <url>https://repository.cloudera.com/artifactory/cloudera-repos</url>
                <releases>
                    <enabled>true</enabled>
                </releases>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>

## 但是又报错了 ##

"C:\Program Files\Java\jdk1.8.0_261\bin\java.exe" "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2020.1.1\lib\idea_rt.jar=7539:D:\Program Files\JetBrains\IntelliJ IDEA 2020.1.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_261\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_261\jre\lib\rt.jar;C:\Program 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core-2.6.0-cdh5.8.0.jar;C:\Users\E480\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-jobclient\2.6.0-cdh5.8.0\hadoop-mapreduce-client-jobclient-2.6.0-cdh5.8.0.jar;C:\Users\E480\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-shuffle\2.6.0-cdh5.8.0\hadoop-mapreduce-client-shuffle-2.6.0-cdh5.8.0.jar;C:\Users\E480\.m2\repository\org\apache\hadoop\hadoop-yarn-server-nodemanager\2.6.0-cdh5.8.0\hadoop-yarn-server-nodemanager-2.6.0-cdh5.8.0.jar;C:\Users\E480\.m2\repository\org\apache\hadoop\hadoop-hdfs\2.6.0-cdh5.8.0\hadoop-hdfs-2.6.0-cdh5.8.0.jar;C:\Users\E480\.m2\repository\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;C:\Users\E480\.m2\repository\xerces\xercesImpl\2.9.1\xercesImpl-2.9.1.jar;C:\Users\E480\.m2\repository\xml-apis\xml-apis\1.3.04\xml-apis-1.3.04.jar;C:\Users\E480\.m2\repository\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-server\1.3.1\hbase-server-1.3.1.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-common\1.3.1\hbase-common-1.3.1.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-procedure\1.3.1\hbase-procedure-1.3.1.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-common\1.3.1\hbase-common-1.3.1-tests.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-prefix-tree\1.3.1\hbase-prefix-tree-1.3.1.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-hadoop-compat\1.3.1\hbase-hadoop-compat-1.3.1.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-hadoop2-compat\1.3.1\hbase-hadoop2-compat-1.3.1.jar;C:\Users\E480\.m2\repository\com\yammer\metrics\metrics-core\2.2.0\metrics-core-2.2.0.jar;C:\Users\E480\.m2\repository\org\apache\commons\commons-math\2.2\commons-math-2.2.jar;C:\Users\E480\.m2\repository\org\mortbay\jetty\jetty-sslengine\6.1.26\jetty-sslengine-6.1.26.jar;C:\Users\E480\.m2\repository\org\mortbay\jetty\jsp-2.1\6.1.14\jsp-2.1-6.1.14.jar;C:\Users\E480\.m2\repository\org\mortbay\jetty\jsp-api-2.1\6.1.14\jsp-api-2.1-6.1.14.jar;C:\Users\E480\.m2\repository\org\mortbay\jetty\servlet-api-2.5\6.1.14\servlet-api-2.5-6.1.14.jar;C:\Users\E480\.m2\repository\org\codehaus\jackson\jackson-jaxrs\1.9.13\jackson-jaxrs-1.9.13.jar;C:\Users\E480\.m2\repository\org\jamon\jamon-runtime\2.4.1\jamon-runtime-2.4.1.jar;C:\Users\E480\.m2\repository\org\apache\htrace\htrace-core\3.1.0-incubating\htrace-core-3.1.0-incubating.jar;C:\Users\E480\.m2\repository\com\lmax\disruptor\3.3.0\disruptor-3.3.0.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-client\1.3.1\hbase-client-1.3.1.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-annotations\1.3.1\hbase-annotations-1.3.1.jar;C:\Users\E480\.m2\repository\org\jruby\jcodings\jcodings\1.0.8\jcodings-1.0.8.jar;C:\Users\E480\.m2\repository\org\jruby\joni\joni\2.1.2\joni-2.1.2.jar;C:\Users\E480\.m2\repository\org\apache\hbase\hbase-protocol\1.3.1\hbase-protocol-1.3.1.jar;C:\Users\E480\.m2\repository\com\github\stephenc\findbugs\findbugs-annotations\1.3.9-1\findbugs-annotations-1.3.9-1.jar" driver
    log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
    log4j:WARN Please initialize the log4j system properly.
    log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
    Exception in thread "main" java.lang.UnsatisfiedLinkError: org.apache.hadoop.io.nativeio.NativeIO$Windows.createDirectoryWithMode0(Ljava/lang/String;I)V
    	at org.apache.hadoop.io.nativeio.NativeIO$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:457)
    	at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission(RawLocalFileSystem.java:510)
    	at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:488)
    	at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:309)
    	at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133)
    	at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:148)
    	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1307)
    	at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1304)
    	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:1693)
    	at org.apache.hadoop.mapreduce.Job.submit(Job.java:1304)
    	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1325)
    	at driver.main(driver.java:37)
    
    Process finished with exit code 1

这个已经很接近我的真实环境了，主要意思说没有权限去创建目录，但是我已经将文件权限取消了，那就说明现在连不上。。。  
连不上的主要原因是上面下载的winutil的目录不对！！

他nnd最后，没办法一个版本一个版本的试，最后我的版本是2.6.0竟然要使用2.7.1的版本的。可能这中间有bug，2.7以后版本就优化了吧。  
最后，增加一个在代码中强制加载这个winutil的方法，当然也是有前人之鉴，我也就是抛砖引玉了，带上链接带上代码：  
[感谢这位老哥][Link 3]

static { 
            try { 
                System.load("C:\\file\\hadoop2.7.6\\bin\\hadoop.dll"); //hadoop.dll文件地址
            } catch (UnsatisfiedLinkError e) { 
                System.err.println("Native code library failed to load.\n" + e);
                System.exit(1);
            }
        }

## 运行一下，发现哎。。。没结果？？？ ##

直接给我就三行日志，就没了？我写的输出内容呢？我写的map输出结果呢？我写的那一堆东西好像都没有跑啊，到底是怎么了？

又是漫长紧张的一段找问题，后来发现自己本地配置的hadoop\_home中没有winutil.ext执行文件，加上。

发现没有执行hadoop.home.dir，加上

然后，小心翼翼的点着运行。

--------------------

至此，可以开心的跑我第一个wordcount了

[https_www.oracle.com_java_technologies_javase_javase-jdk8-downloads.html]: https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
[Link 1]: https://gitee.com/tay3223/winutils
[Link 2]: https://gitee.com/lroyplus/winutils
[Link 3]: https://www.cnblogs.com/supershuai/p/12461907.html