hadoop on windows with Eclipse

http://ebiquity.umbc.edu/Tutorials/Hadoop/00%20-%20Intro.html

 

 

hadoop无法正常启动(1)

执行  $ bin/hadoop start-all.sh之后,无法启动.

异常一

 

 Exception in thread "main" java.lang.IllegalArgumentException: Invalid URI for NameNode address (check fs.defaultFS): file:/// has no authority.

localhost:      at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:214)

localhost:      at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:135)

localhost:      at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:119)

localhost:      at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:481)

解决方法：

此时是没有配置conf/mapred-site.xml的缘故.  在0.21.0版本上是配置mapred-site.xml,在之前的版本是配置core-site.xml,0.20.2版本中配置mapred-site.xml无效,只能配置core-site.xml文件

<configuration>

  <property>

    <name>fs.default.name</name>

    <value>hdfs://localhost:9000</value>

  </property>

  <property>

    <name>mapred.job.tracker</name>

    <value>hdfs://localhost:9001</value>

  </property>

  <property>

    <name>dfs.replication</name>

    <value>1</value>

  </property>

</configuration>

 

hadoop无法正常启动(2)

异常二、

 

starting namenode, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-namenode-aist.out

localhost: starting datanode, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-datanode-aist.out

localhost: starting secondarynamenode, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-secondarynamenode-aist.out

localhost: Exception in thread "main" java.lang.NullPointerException

localhost:      at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:134)

localhost:      at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:156)

localhost:      at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:160)

localhost:      at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:131)

localhost:      at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:115)

localhost:      at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:469)

starting jobtracker, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-jobtracker-aist.out

localhost: starting tasktracker, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-tasktracker-aist.out

 

 

解决方法： 同上

 

 

 

 

hadoop无法正常启动(3)

异常三、

 

starting namenode, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-namenode-aist.out

localhost: starting datanode, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-datanode-aist.out

localhost: Error: JAVA_HOME is not set.

localhost: starting secondarynamenode, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-secondarynamenode-aist.out

localhost: Error: JAVA_HOME is not set.

starting jobtracker, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-jobtracker-aist.out

localhost: starting tasktracker, logging to /home/xixitie/hadoop/bin/../logs/hadoop-root-tasktracker-aist.out

localhost: Error: JAVA_HOME is not set.

 

解决方法:

请在$hadoop/conf/hadoop-env.sh文件中配置JDK的环境变量

 

export  JAVA_HOME=/home/xixitie/jdk

export  CLASSPATH=$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

 

hadoop无法正常启动(4)

 

异常四:mapred-site.xml配置中使用hdfs://localhost:9001，而不使用localhost:9001的配置

异常信息如下：

11/04/20 23:33:25 INFO security.Groups: Group mapping impl=org.apache.hadoop.sec                                                                             urity.ShellBasedUnixGroupsMapping; cacheTimeout=300000

11/04/20 23:33:25 WARN fs.FileSystem: "localhost:9000" is a deprecated filesyste                                                                             m name. Use "hdfs://localhost:9000/" instead.

11/04/20 23:33:25 WARN conf.Configuration: mapred.task.id is deprecated. Instead                                                                             , use mapreduce.task.attempt.id

11/04/20 23:33:25 WARN fs.FileSystem: "localhost:9000" is a deprecated filesyste                                                                             m name. Use "hdfs://localhost:9000/" instead.

11/04/20 23:33:25 WARN fs.FileSystem: "localhost:9000" is a deprecated filesyste                                                                             m name. Use "hdfs://localhost:9000/" instead.

 

解决方法：

mapred-site.xml配置中使用hdfs://localhost:9000，而不使用localhost:9000的配置

 

  <property>

    <name>fs.default.name</name>

    <value>hdfs://localhost:9000</value>

  </property>

  <property>

    <name>mapred.job.tracker</name>

    <value>hdfs://localhost:9001</value>

  </property>

 

 

hadoop无法正常启动(5)

异常五、no namenode to stop 问题的解决:

异常信息如下：

11/04/20 21:48:50 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 0 time(s).

11/04/20 21:48:51 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 1 time(s).

11/04/20 21:48:52 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 2 time(s).

11/04/20 21:48:53 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 3 time(s).

11/04/20 21:48:54 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 4 time(s).

11/04/20 21:48:55 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 5 time(s).

11/04/20 21:48:56 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 6 time(s).

11/04/20 21:48:57 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 7 time(s).

11/04/20 21:48:58 INFO ipc.Client: Retrying connect to server: localhost/127.0.0                                                                             .1:9000. Already tried 8 time(s).

 

解决方法:

这个问题是由namenode没有启动起来引起的,为什么no namenode to stop,可能之前的一些数据对namenode有影响,

$ bin/hadoop namenode -format

$bin/hadoop start-all.sh

 

hadoop无法正常启动(6)

异常五、no datanode to stop 问题的解决:

有时数据结构出现问题会产生无法启动datanode的问题。

然后用 hadoop namenode -format  重新格式化后仍然无效，/tmp中的文件并没有清楚。

其实还需要清除/tmp/hadoop*里的文件。

 

      hadoop  fs -rmr /tmp

 

         stop-all.sh

 

        rm -rf /tmp/hadoop*

 

        hadoop namenode -format

 

         start-all.sh

 

搞了好几天终于把window下hadoop配置给搞好了，真不是搞技术的料啊！！！！