hadoop pagerank运行时出错答案

【问题标题】：hadoop pagerank error when runninghadoop pagerank运行时出错
【发布时间】：2017-12-01 18:55:00
【问题描述】：

我已经在我的 vmware 上安装了 hadoop 并设计了我的 jar 文件 pagerank。运行以下命令：

hadoop jar PageRank-1.0.0.jar PageRankDriver init input output 2，出现如下错误；

Failing this attempt.Diagnostics: [2017-12-01 12:55:58.278]Exception from container-launch.
Container id: container_1512069161738_0011_02_000001
Exit code: 1
Stack trace: ExitCodeException exitCode=1: 
        at org.apache.hadoop.util.Shell.runCommand(Shell.java:994)
        at org.apache.hadoop.util.Shell.run(Shell.java:887)
        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:1212)
        at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:295)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.launchContainer(ContainerLaunch.java:457)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:277)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:90)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

[2017-12-01 12:55:58.278]
[2017-12-01 12:55:58.279]Container exited with a non-zero exit code 1. Last 4096 bytes of stderr :
Error: Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

Please check whether your etc/hadoop/mapred-site.xml contains the below configuration:
<property>
  <name>yarn.app.mapreduce.am.env</name>
  <value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
<property>
  <name>mapreduce.map.env</name>
  <value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
<property>
  <name>mapreduce.reduce.e nv</name>
  <value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
[2017-12-01 12:55:58.279]
[2017-12-01 12:55:58.279]Container exited with a non-zero exit code 1. Last 4096 bytes of stderr :
Error: Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

Please check whether your etc/hadoop/mapred-site.xml contains the below configuration:
<property>
  <name>yarn.app.mapreduce.am.env</name>
  <value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
<property>
  <name>mapreduce.map.env</name>
  <value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
<property>
  <name>mapreduce.reduce.e nv</name>
  <value>HADOOP_MAPRED_HOME=${full path of your hadoop distribution directory}</value>
</property>
[2017-12-01 12:55:58.279]
For more detailed output, check the application tracking page: http://number9.cs.stevens.edu:8088/cluster/app/application_1512069161738_0011 Then click on links to logs of each attempt.
. Failing the application.
2017-12-01 12:55:59,219 INFO mapreduce.Job: Counters: 0
Init Job Error

有谁知道我该如何解决这个问题？

【问题讨论】：

标签： java hadoop pagerank

【解决方案1】：

在mapred-site.xml 中进行如下配置更改

<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
    <property>
        <name>yarn.app.mapreduce.am.env</name>
        <value>HADOOP_MAPRED_HOME=${HADOOP_HOME}</value>
    </property>
    <property>
        <name>mapreduce.map.env</name>
        <value>HADOOP_MAPRED_HOME=${HADOOP_HOME}</value>
    </property>
    <property>
        <name>mapreduce.reduce.env</name>
        <value>HADOOP_MAPRED_HOME=${HADOOP_HOME}</value>
    </property>
</configuration>

【讨论】：

我有同样的问题，我按照描述做了，但问题仍然存在
@HugoOshiro 尝试使用 stop-all.sh 停止所有 hadoop 守护程序，然后使用 start-all.sh 重新启动它们，然后它对我有用。
@HugoOshiro 此外，您应该已经在 bash 配置文件（.bashrc 或 .bash_profile）中定义了 HADOOP_HOME。喜欢export HADOOP_HOME="/usr/local/hadoop"

【解决方案2】：

在编辑您需要重新启动所有服务后，上面的对我有用。

使用：

stop-all.sh
start-all.sh

【讨论】：