datanode 未启动

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/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = java.net.UnknownHostException: Slave1.Hadoop: Slave1.Hadoop
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.0.4
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by 'hortonfo'
on Wed Oct 3 05:13:58 UTC 2012
************************************************************/
2014-03-28 22:18:55,133 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2014-03-28 22:18:55,158 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats r
egistered.
2014-03-28 22:18:55,161 ERROR org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Error getting localhost name. Using 'localho
st'...
java.net.UnknownHostException: Slave1.Hadoop: Slave1.Hadoop
        at java.net.InetAddress.getLocalHost(InetAddress.java:1360)
        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.getHostname(MetricsSystemImpl.java:463)
        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.configureSystem(MetricsSystemImpl.java:394)
        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.configure(MetricsSystemImpl.java:390)
        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.start(MetricsSystemImpl.java:152)
        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.init(MetricsSystemImpl.java:133)
        at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.init(DefaultMetricsSystem.java:40)
        at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.initialize(DefaultMetricsSystem.java:50)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1520)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1539)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1682)
2014-03-28 22:18:55,163 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2014-03-28 22:18:55,163 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2014-03-28 22:18:55,281 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.
2014-03-28 22:18:55,341 INFO org.apache.hadoop.util.NativeCodeLoader: Loaded the native-hadoop library
2014-03-28 22:18:55,489 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.net.UnknownHostException: Slave1.Hadoop:
Slave1.Hadoop
        at java.net.InetAddress.getLocalHost(InetAddress.java:1360)
        at org.apache.hadoop.security.SecurityUtil.getLocalHostName(SecurityUtil.java:252)
        at org.apache.hadoop.security.SecurityUtil.login(SecurityUtil.java:270)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:291)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1582)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1521)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1539)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665)

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

我的主机名字设置未：Hostname=Slave1.Hadoop

出现以上的错误，是因为/etc/hosts中没有设置

应添加一句

192.168.71.12 Slave1.Hadoop

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