（1）更改Hdfs-site.xml中的目录格式

Question

我正在跟踪此视频教程，试图在计算机上设置hadoop。

How to Install Hadoop on Windows 10

我已经成功设置：从sbin目录执行start-all.xml时没有错误。

但是当我尝试执行我的WordCount.jar文件时，发生了错误：

2/23 11:42:59 INFO localizer.ResourceLocalizationService: Created localizer for container_1550911199370_0001_02_000001
19/02/23 11:42:59 INFO localizer.ResourceLocalizationService: Localizer failed
org.apache.hadoop.util.DiskChecker$DiskErrorException: No space available in any of the local directories.
        at org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:399)
        at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:151)
        at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:132)
        at org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:116)
        at org.apache.hadoop.yarn.server.nodemanager.LocalDirsHandlerService.getLocalPathForWrite(LocalDirsHandlerService.java:545)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$LocalizerRunner.run(ResourceLocalizationService.java:1142)
19/02/23 11:42:59 ERROR nodemanager.DeletionService: Exception during execution of task in DeletionService
java.lang.NullPointerException: path cannot be null
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)
        at org.apache.hadoop.fs.FileContext.fixRelativePart(FileContext.java:281)
        at org.apache.hadoop.fs.FileContext.delete(FileContext.java:769)
        at org.apache.hadoop.yarn.server.nodemanager.DeletionService$FileDeletionTask.run(DeletionService.java:273)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        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)
19/02/23 11:42:59 INFO container.ContainerImpl: Container container_1550911199370_0001_02_000001 transitioned from LOCAL

我确定我有足够的空间来处理工作。我的系统是全新安装的：

配置信息：

这是我的配置文件：

core-site.xml

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

hdfs-site.xml

<configuration>
   <property>
       <name>dfs.replication</name>
       <value>1</value>
   </property>
   <property>
       <name>dfs.namenode.name.dir</name>
       <value>file:///C:/hadoop-2.8.0/data/namenode</value>
   </property>
   <property>
       <name>dfs.datanode.data.dir</name>
       <value>file:///C:/hadoop-2.8.0/data/datanode</value>
   </property>
</configuration>

mapred-site.xml

<configuration>
   <property>
       <name>mapreduce.framework.name</name>
       <value>yarn</value>
   </property>
</configuration>

yarn-site.xml

<configuration>
   <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
   </property>
   <property>
        <name>yarn.nodemanager.auxservices.mapreduce.shuffle.class</name>  
    <value>org.apache.hadoop.mapred.ShuffleHandler</value>
   </property>
   <property>
   <name>yarn.nodemanager.disk-health-checker.enable</name>
   <value>false</value>
</property>
</configuration>

这是我执行jar的方式（准备输入/输出目录）：

hadoop fs -mkdir /top
hadoop fs -mkdir /top/input
hadoop fs -mkdir /top/output
hadoop -put C:/hadoop-2.8.0/wordcount2.txt /top/input
hadoop jar C:/hadoop-2.8.0/WordCount.jar /top/input/wordcount2.txt /top/output/output.txt

Answer 1

主要错误是：

org.apache.hadoop.util.DiskChecker $ DiskErrorException：任何本地目录中没有可用空间。

为了解决此问题，您可以尝试：

（1）更改Hdfs-site.xml中的目录格式

在 hdfs-site.xml 文件中，尝试替换以下值：

<configuration>
   <property>
       <name>dfs.replication</name>
       <value>1</value>
   </property>
   <property>
       <name>dfs.namenode.name.dir</name>
       <value>file:///C:/hadoop-2.8.0/data/namenode</value>
   </property>
   <property>
       <name>dfs.datanode.data.dir</name>
       <value>file:///C:/hadoop-2.8.0/data/datanode</value>
   </property>
</configuration>

与

<configuration>
   <property>
       <name>dfs.replication</name>
       <value>1</value>
   </property>
   <property>
       <name>dfs.namenode.name.dir</name>
       <value>C:\hadoop-2.8.0\data\namenode</value>
   </property>
   <property>
       <name>dfs.datanode.data.dir</name>
       <value>C:\hadoop-2.8.0\data\datanode</value>
   </property>
</configuration>

（2）目录的读写权限

检查当前用户是否具有读写hadoop目录的权限。

（3）节点管理器目录

尝试将以下属性添加到yarn-site.xml文件中：

<property>
<name>yarn.nodemanager.local-dirs</name>
<value>C:/hadoop-2.8.0/yarn/local</value>
</property>
<property>
<name>yarn.nodemanager.log-dirs</name>
<value>C:/hadoop-2.8.0/yarn/logs</value>
</property>

更改目录后，尝试格式化namenode。

如果仍然无法正常工作，则可以参考以下逐步指南在Windows上安装Hadoop，它对我来说很好：

Answer 2

尝试格式化名称节点和数据节点。

Hadoop Windows安装程序。运行WordCountJob时出错：“任何本地目录中都没有可用空间”

2 个答案:

（1）更改Hdfs-site.xml中的目录格式

（2）目录的读写权限

（3）节点管理器目录