datanode无法启动

datanode无法启动，datanode.log报如下异常：

2013-01-17 15:56:59,188 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.lang.IndexOutOfBoundsException: Index: 0, Size:

 0
at java.util.ArrayList.RangeCheck(ArrayList.java:547)
at java.util.ArrayList.get(ArrayList.java:322)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.resolveNetworkLocation(FSNamesystem.java:2515)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:2479)
at org.apache.hadoop.hdfs.server.namenode.NameNode.register(NameNode.java:973)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382)


at org.apache.hadoop.ipc.Client.call(Client.java:1070)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
at $Proxy5.register(Unknown Source)
at org.apache.hadoop.hdfs.server.datanode.DataNode.register(DataNode.java:673)
at org.apache.hadoop.hdfs.server.datanode.DataNode.runDatanodeDaemon(DataNode.java:1480)
at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1540)
at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665)

at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1682)

原因：/etc/hosts内容配置不对，在第一行，第二行的尾部多配置了主机名。

如127.0.0.1 localhost.localdomainlocalhost.localdomain localhost4localhost4.localdomain4 localhost host200
::1 localhost.localdomainlocalhost.localdomain localhost6localhost6.localdomain6 localhost host200

解决方法：去除上面的host200即可。