在VMware虚拟机下搭建了hadoop集群，ubuntu-12.04，一台master，三台slave。hadoop-0.20.2版本。在 master机器上利用eclipse-3.3连接hadoop并运行mapreduce实例可以成功。但是当在windows下eclipse-3.3 远程连接hadoop，DFS locations可以连接上，但运行mapreduce实例时报错，如下：
13/07/02 13:37:04 WARN conf.Configuration: DEPRECATED: hadoop-site.xml found in the classpath.
Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, mapred-site.xml and hdfs-site.xml to override properties of core-default.xml, mapred-default.xml and hdfs-default.xml respectively Exception in thread "main" java.io.IOException: Call to Master.Hadoop/172.20.145.22:9000 failed on local exception: java.io.EOFException at org.apache.hadoop.ipc.Client.wrapException(Client.java:1107) at org.apache.hadoop.ipc.Client.call(Client.java:1075) at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225) at $Proxy1.getProtocolVersion(Unknown Source) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:379) at org.apache.hadoop.hdfs.DFSClient.createRPCNamenode(DFSClient.java:119) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:238) at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:203) at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89) at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1386) at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:66) at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1404) at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254) at org.apache.hadoop.fs.Path.getFileSystem(Path.java:187) at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.addInputPath(FileInputFormat.java:372) at org.apache.hadoop.examples.WordCount.main(WordCount.java:68) Caused by: java.io.EOFException at java.io.DataInputStream.readInt(Unknown Source) at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:804) at org.apache.hadoop.ipc.Client$Connection.run(Client.java:749)
分析原因和解决方案:
导致这个问题的原因是由于eclipse上面引入的hadoop版本和linux虚拟机上面安装的hadoop版本不一致导致，把两边环境的版本换成一致就可以了。