Hadoop 2.2.0 中的 MapReduce 不工作答案

【问题标题】：MapReduce in Hadoop 2.2.0 not workingHadoop 2.2.0 中的 MapReduce 不工作
【发布时间】：2014-04-22 22:27:26
【问题描述】：

在伪分布式模式下安装和配置我的Hadoop 2.2.0 后，一切都在运行，您可以在jps 中看到：

$ jps
2287 JobHistoryServer
1926 ResourceManager
2162 NodeManager
1834 DataNode
1756 NameNode
3013 Jps

然后我用

运行 wordcount 示例

hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /user/hdfs/file /output

执行冻结（？）如下：

$ hadoop jar $HADOOP_HOME/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /user/hdfs/file /output                                          
OpenJDK 64-Bit Server VM warning: You have loaded library /home/hduser/hadoop-src/hadoop-2.2.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
14/04/22 22:17:24 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
14/04/22 22:17:25 INFO client.RMProxy: Connecting to ResourceManager at /192.168.33.10:8032
14/04/22 22:17:25 INFO input.FileInputFormat: Total input paths to process : 1
14/04/22 22:17:25 INFO mapreduce.JobSubmitter: number of splits:1
14/04/22 22:17:25 INFO Configuration.deprecation: user.name is deprecated. Instead, use mapreduce.job.user.name
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.jar is deprecated. Instead, use mapreduce.job.jar
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.output.value.class is deprecated. Instead, use mapreduce.job.output.value.class
14/04/22 22:17:25 INFO Configuration.deprecation: mapreduce.combine.class is deprecated. Instead, use mapreduce.job.combine.class
14/04/22 22:17:25 INFO Configuration.deprecation: mapreduce.map.class is deprecated. Instead, use mapreduce.job.map.class
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.job.name is deprecated. Instead, use mapreduce.job.name
14/04/22 22:17:25 INFO Configuration.deprecation: mapreduce.reduce.class is deprecated. Instead, use mapreduce.job.reduce.class
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.input.dir is deprecated. Instead, use mapreduce.input.fileinputformat.inputdir
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.output.dir is deprecated. Instead, use mapreduce.output.fileoutputformat.outputdir
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.output.key.class is deprecated. Instead, use mapreduce.job.output.key.class
14/04/22 22:17:25 INFO Configuration.deprecation: mapred.working.dir is deprecated. Instead, use mapreduce.job.working.dir
14/04/22 22:17:26 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1398204897594_0002
14/04/22 22:17:26 INFO impl.YarnClientImpl: Submitted application application_1398204897594_0002 to ResourceManager at /192.168.33.10:8032
14/04/22 22:17:26 INFO mapreduce.Job: The url to track the job: http://vagrant-ubuntu-saucy-64:8088/proxy/application_1398204897594_0002/
14/04/22 22:17:26 INFO mapreduce.Job: Running job: job_1398204897594_0002
14/04/22 22:17:36 INFO mapreduce.Job: Job job_1398204897594_0002 running in uber mode : false
14/04/22 22:17:36 INFO mapreduce.Job:  map 0% reduce 0%

有什么想法吗？

【问题讨论】：

似乎与stackoverflow.com/questions/18525354/…有关，但建议的答案是针对hadoop 1x而不是针对hadoop 2.2.0

标签： hadoop mapreduce hadoop2

【解决方案1】：

问题出在文件yarn-site.xml 中。 property必须大于3072 Mb，而我把它配置为1024 Mb，所以正确的方法是

<property>
    <name>yarn.nodemanager.resource.memory-mb</name>
    <value>4096</value>
    <description>Physical memory, in MB, to be made available to running containers</description>
</property>

【讨论】：

我按照你说的增加了内存。但它仍然对我冻结？
能否请您发布该容器的用户日志？

【解决方案2】：

我觉得日志不够详细，可以先打开调试模式：

export HADOOP_ROOT_LOGGER=DEBUG,console

然后运行 wordcount 作业以查看更多日志和粘贴

【讨论】：