我读了其他关于hadoop的hdfs配置问题的文章。但是，没有一个是有用的。所以，我发布了我的问题。我遵循了hadoopv1.2.1的教程。当我运行hadoop fs-ls命令时，出现了以下错误：

16/08/29 15:20:35 INFO ipc.Client: Retrying connect to server:   localhost/127.0.0.1:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

我的core-site.xml文件是：

<configuration>
<property>
  <name>fs.default.name</name>
    <value>hdfs://localhost:9000</value>
</property>

<property>
  <name>hadoop.tmp.dir</name>
    <value>/mnt/miczfs/hadoop/tmp/${user.name}</value>
</property>
</configuration>

另外，我的hdfs-site.xml文件如下：

<configuration>
<property>
 <name>dfs.replication</name>
 <value>1</value>
    </property>
<property>
   <name>dfs.name.dir</name>
    <value>/mnt/miczfs/hadoop/hdfs/${user.name}/namenode</value>
</property>
 <property>
    <name>dfs.secondary.http.address</name>
    <value>localhost:0</value>
 </property>
<property>
  <name>dfs.data.dir</name>
    <value>/mnt/miczfs/hadoop/hdfs/${user.name}/datanode</value>
</property>
<property>
   <name>dfs.datanode.address</name>
   <value>localhost:0</value>
</property>
<property>
   <name>dfs.datanode.http.address</name>
   <value>localhost:0</value>
</property>
<property>
   <name>dfs.datanode.ipc.address</name>
   <value>localhost:0</value>
</property>
</configuration>

而/etc/hosts是这样的：

127.0.0.1   localhost localhost.localdomain localhost4  localhost4.localdomain4
::1         localhost localhost.localdomain localhost6    localhost6.localdomain6
 172.31.1.1      micrasrelmond.local micrasrelmond #Generated-by-micctrl
 172.31.1.1      mic0.local mic0 #Generated-by-micctrl

如果可能的话，请帮助我。谢谢