hadoop NullPointerException [英] hadoop NullPointerException

问题描述

我试图设置一个hadoop多节点群集 NullPointerException 。

  hadoop @ psycho-O：〜/ project / hadoop-0.20.2 $ bin / start-dfs.sh 
开始namenode，记录到/home/hadoop/project/hadoop-0.20.2/bin/../logs/hadoop-hadoop-namenode-psycho-O.out 
 slave：bash：line 0：cd： /home/hadoop/project/hadoop-0.20.2/bin/ ..：没有这样的文件或目录
 slave：bash：/home/hadoop/project/hadoop-0.20.2/bin/hadoop-daemon。 sh：没有这样的文件或目录
 master：启动datanode，记录到/home/hadoop/project/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-psycho-O.out 
 master：启动secondarynamenode，记录到/home/hadoop/project/hadoop-0.20.2/bin/../logs/hadoop-hadoop-secondarynamenode-psycho-O.out 
 master：线程中的异常mainjava.lang.NullPointerException 
 master：在org.apache.hadoop.net.NetUtils.createSocketAddr（NetUtils.java:134）
 master：在org.apache.hadoop.hdfs.server。 namenode.NameNode.getAddress（NameNode.java:156）
 master：在org.apache.hadoop.hdfs.server.namenode.NameNode.ge tAddress（NameNode.java:160）
 master：在org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize（SecondaryNameNode.java:131）
 master：在org.apache.hadoop。 < init>（SecondaryNameNode.java:115）
 master：at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main（SecondaryNameNode.java:469）
 hadoop @ psycho-O：〜/ project / hadoop-0.20.2 
  

我不知道造成这种情况。请帮我弄清楚这个问题。我不是一个新鲜的话题，所以请尽可能减少你的答案。 ：）

如果需要更多信息，请告诉我。

解决方案

看来你还没有在你的datanode（slave）中安装hadoop（或）路径。您的案例中的正确路径应该是/home/hadoop/project/hadoop-0.20.2 /

I was trying to setup a multi node cluster of hadoop michael-noll's way using two computers.

When I tried to format the hdfs it showed a NullPointerException.

hadoop@psycho-O:~/project/hadoop-0.20.2$ bin/start-dfs.sh
starting namenode, logging to /home/hadoop/project/hadoop-0.20.2/bin/../logs/hadoop-hadoop-namenode-psycho-O.out
slave: bash: line 0: cd: /home/hadoop/project/hadoop-0.20.2/bin/..: No such file or directory
slave: bash: /home/hadoop/project/hadoop-0.20.2/bin/hadoop-daemon.sh: No such file or directory
master: starting datanode, logging to /home/hadoop/project/hadoop-0.20.2/bin/../logs/hadoop-hadoop-datanode-psycho-O.out
master: starting secondarynamenode, logging to /home/hadoop/project/hadoop-0.20.2/bin/../logs/hadoop-hadoop-secondarynamenode-psycho-O.out
master: Exception in thread "main" java.lang.NullPointerException
master:     at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:134)
master:     at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:156)
master:     at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:160)
master:     at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:131)
master:     at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:115)
master:     at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:469)
hadoop@psycho-O:~/project/hadoop-0.20.2$ 

I dunno what is causing this. Please help me figure out the problem. I am not a fresher in the topic, so please make your answer less techy as possible. :)

If some more information is needed kindly tell me.

解决方案

It seems you have not installed hadoop in your datanode(slave) at all (or) you have done it in a wrong path. The correct path in your case should be /home/hadoop/project/hadoop-0.20.2/

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