mapreduce运行的bug收录

在8088端口可以看到日志文件（主要看error），操作如下：

1.window jdk版本最好和linux jdk 版本一致，不然容易出现莫名奇妙的bug

之前出现一个bug: UnsupportedClassVersionError: .......

就是版本错误引起的，花了好长的时间才搞定

2.当出现ClassNotFoundException 时，需要将src的文件export成jar包放入如下路径，然后在主函数加入代码如下：

3.如果出现  INFO mapreduce.Job: Job job_1398669840354_0003 failed with state FAILED due to:

Application application_1398669840354_0003 failed 2 times due to AM Container for appattempt_1398669840354_0003_000002 exited with exitCode: 1

due to: Exception from container-launch: org.apache.hadoop.util.Shell$ExitCodeException: .......

是mapred-default.xml，yarn-default.xml 没加如下参数（在最后添加即可）：

mapred-default.xml：

<property>
    <name>mapreduce.application.classpath</name>
    <value>
        $HADOOP_CONF_DIR,
        $HADOOP_COMMON_HOME/share/hadoop/common/*,
        $HADOOP_COMMON_HOME/share/hadoop/common/lib/*,
        $HADOOP_HDFS_HOME/share/hadoop/hdfs/*,
        $HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*,
        $HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*,

        $HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*,
        $HADOOP_YARN_HOME/share/hadoop/yarn/*,
        $HADOOP_YARN_HOME/share/hadoop/yarn/lib/*
    </value>
</property>

yarn-default.xml ：

 <property>
    <name>mapreduce.application.classpath</name>
    <value>
        $HADOOP_CONF_DIR,
        $HADOOP_COMMON_HOME/share/hadoop/common/*,
        $HADOOP_COMMON_HOME/share/hadoop/common/lib/*,
        $HADOOP_HDFS_HOME/share/hadoop/hdfs/*,
        $HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*,
        $HADOOP_MAPRED_HOME/share/hadoop/mapreduce/*,
        $HADOOP_MAPRED_HOME/share/hadoop/mapreduce/lib/*,
        $HADOOP_YARN_HOME/share/hadoop/yarn/*,
        $HADOOP_YARN_HOME/share/hadoop/yarn/lib/*
    </value>
</property>

（这两个文件分别在hadoop-mapreduce-client-core-2.8.5.jar，hadoop-yarn-api-2.8.5.jar 中）

注：得先将这两个jar包remove bulid Path ,然后才能修改 .xml文件

注：！！！如果你在eclipse启动mapreduce,则改window的jar包，在linux机则改hadoop的mapred-site.xml和yarn-site.xml文件

mapred-site.xml:

yarn-site.xml:

4.若出现AccessContorlException:Permisson denied:.........

应该是用户权限问题，加入如下代码:

//1.设置yarn处理数据时的user
        System.setProperty("HADOOP_USER_NAME","root");

5.如出现ExitCodeException：exit code =1 : /bin/bash .........

是因为Job 任务是在window提交的，而接受方是yarn,编辑脚本命令时是以window为标准，所以运行脚本命令时就出错了

加如下代码：

//4.跨平台提交时，需要加这个参数
        conf.set("mapreduce.app-submission.cross-platform", "true");

6.出现ExitCodeException exitCode=127:

For more detailed output, check application tracking page:http://dev-hadoop6:8088/cluster/app/application_15447
Diagnostics: Exception from container-launch.
Container id: container_1544766080243_0018_02_000001
Exit code: 127
Stack trace: ExitCodeException exitCode=127:
        at org.apache.hadoop.util.Shell.runCommand(Shell.java:585)
        at org.apache.hadoop.util.Shell.run(Shell.java:482)
        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:776)
        at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerE
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLa
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLa
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

Container exited with a non-zero exit code 127
Failing this attempt. Failing the application.
18/12/14 17:48:56 INFO mapreduce.Job: Counters: 0
18/12/14 17:48:56 WARN mapreduce.HdfsMapReduce: Path /mapred-temp/job-user-analysis-statistic/01/top_in is not
java.io.IOException: Set input path failed !
        at com.tracker.offline.common.mapreduce.HdfsMapReduce.setInputPath(HdfsMapReduce.java:165)
        at com.tracker.offline.common.mapreduce.HdfsMapReduce.buildJob(HdfsMapReduce.java:122)
        at com.tracker.offline.common.mapreduce.HdfsMapReduce.waitForCompletion(HdfsMapReduce.java:65)
        at com.tracker.offline.business.job.user.JobAnalysisStatisticMR.main(JobAnalysisStatisticMR.java:88)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

这是编码报错，yarn-env.sh不对

修改yarn-env.sh的java_home即可