我找了两天的解决办法。但什么都没用。
首先，我不熟悉整个hadoop/yarn/hdfs主题，希望配置一个小集群。
上面的消息并不是每次我从mapreduce-examples.jar运行一个示例时都会显示出来，有时teragen可以工作，有时不行。在某些情况下，整个作业失败，而在另一些情况下，作业成功完成。有时作业失败，而不打印上面的消息。

14/06/08 15:42:46 INFO ipc.Client: Retrying connect to server: FQDN-HOSTNAME/XXX.XX.XX.XXX:53022. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=3, sleepTime=1000 MILLISECONDS)

此邮件打印30次。此外，端口（在代码示例：53022中）在每次启动作业时都会发生变化。如果作业成功完成，则这是打印

14/06/08 15:34:20 INFO mapred.ClientServiceDelegate: Application state is completed. FinalApplicationStatus=SUCCEEDED. Redirecting to job history server
14/06/08 15:34:20 INFO mapreduce.Job: Job job_1402234146062_0002 running in uber mode : false
14/06/08 15:34:20 INFO mapreduce.Job:  map 100% reduce 100%
14/06/08 15:34:20 INFO mapreduce.Job: Job job_1402234146062_0002 completed successfully

如果失败，则会显示。

INFO mapreduce.Job: Job job_1402234146062_0005 failed with state FAILED due to: Task failed task_1402234146062_0005_m_000002
Job failed as tasks failed. failedMaps:1 failedReduces:0

在本例中，某些任务失败。但是在nodemanager、datanode、resourcemanager的日志文件中。。。找不到任何理由或信息。

INFO mapreduce.Job: Task Id : attempt_1402234146062_0006_m_000002_1, Status : FAILED

有关我的配置的其他信息：used os:centos 6.5 java版本：openjdk runtime environment（rhel-2.4.7.1.el6_5-x86_64 u55-b13）openjdk 64位服务器vm（内部版本24.51-b03，混合模式）
yarn-site.xml文件

<configuration>

<!-- Site specific YARN configuration properties -->
        <property>
                <name>yarn.nodemanager.address</name>
                <value>FQDN-HOSTNAME:8050</value>
        </property>
        <property>
                <name>yarn.nodemanager.aux-services</name>
                <value>mapreduce_shuffle</value>
        </property>
        <property>
                  <name>yarn.nodemanager.localizer.address</name>
                  <value>FQDN-HOSTNAME:8040</value>
        </property>
        <property>
                <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
                <value>org.apache.hadoop.mapred.ShuffleHandler</value>
        </property>
        <property>
                  <name>yarn.resourcemanager.resource-tracker.address</name>
                  <value>FQDN-HOSTNAME:8025</value>
        </property>
        <property>
                  <name>yarn.resourcemanager.scheduler.address</name>
                  <value>FQDN-HOSTNAME:8030</value>
        </property>
        <property>
                  <name>yarn.resourcemanager.address</name>
                  <value>FQDN-HOSTNAME:8032</value>
        </property>
</configuration>

hdfs-site.xml文件

<configuration>
        <property>
                <name>dfs.replication</name>
                <value>2</value>
        </property>
        <property>
                   <name>dfs.permissions </name>
                   <value>false </value>
        </property>
        <property>
                <name>dfs.namenode.name.dir</name>
                <value>file:///var/data/hadoop/hdfs/nn</value>
        </property>
        <property>
                <name>fs.checkpoint.dir</name>
                <value>file:///var/data/hadoop/hdfs/snn</value>
        </property>
        <property>
                <name>fs.checkpoint.edits.dir</name>
                <value>file:///var/data/hadoop/hdfs/snn</value>
                <name>fs.checkpoint.edits.dir</name>
                <value>file:///var/data/hadoop/hdfs/snn</value>
        </property>
        <property>
                <name>dfs.datanode.data.dir</name>
                <value>file:///var/data/hadoop/hdfs/dn</value>
        </property>
</configuration>

mapred-site.xml文件

<configuration>
        <property>
                <name>mapreduce.framework.name</name>
                <value>yarn</value>
        </property>
        <property>
                <name>mapreduce.cluster.temp.dir</name>
                <value>/mapred/tempDir</value>
        </property>
        <property>
                <name>mapreduce.cluster.local.dir</name>
                <value>/mapred/localDir</value>
        </property>
        <property>
                <name>mapreduce.jobhistory.address</name>
                <value>FQDN-HOSTNAME:10020</value>
        </property>
</configuration>

我希望有人能帮助我谢谢你，诺曼