hadoop伪分布式系统：could only be replicated to 0 nodes, instead of 1

转自：http://blog.csdn.net/weijonathan/article/details/9162619

could only be replicated to 0 nodes, instead of 1

 2013-06-24 11:39:32,383 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:zqgame cause:java.io.IOException: File /data/zqhadoop/data/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
 2013-06-24 11:39:32,384 INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 9000, call addBlock(/data/zqhadoop/data/mapred/system/jobtracker.info, DFSClient_NONMAPREDUCE_-344066732_1, null) from 192.168.216.133:59866: error: java.io.IOException: File /data/zqhadoop/data/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
 java.io.IOException: File /data/zqhadoop/data/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1920)
         at org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:783)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
         at java.lang.reflect.Method.invoke(Method.java:601)
         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1432)
         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1428)
         at java.security.AccessController.doPrivileged(Native Method)
         at javax.security.auth.Subject.doAs(Subject.java:415)
         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)
         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1426)

这里hadoop去查找可用的节点，但是结果找不到。

问题处在/etc/hosts和$HADOOP_HOME/conf/mapred-site.xml和core-site.xml。

解决方法：

1、修改$HADOOP_HOME/conf/mapred-site.xml和core-site.xml，把host修改为IP地址

core-site.xml

 zqgame@master:~/hadoop-1.2.0/bin$ more ../conf/core-site.xml







          fs.default.name
          hdfs://192.168.216.133:9000


                 hadoop.tmp.dir
                 /data/zqhadoop/data

mapred-site.xml

 zqgame@master:~/hadoop-1.2.0/bin$ more ../conf/mapred-site.xml







          mapred.job.tracker
          192.168.216.133:9001

2、修改/etc/hosts配置，添加本机IP绑定

 zqgame@master:~/hadoop-1.2.0/bin$ more /etc/hosts
 127.0.0.1       localhost
 127.0.1.1       master
 192.168.216.133 localhost.localdomain localhost

3、关闭防火墙