hadoop 集群 java.net.UnknownHostException

java.net.UnknownHostException: node104: node104

        at java.net.InetAddress.getLocalHost(InetAddress.java:1475)

        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.getHostname(MetricsSystemImpl.java:547)

        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.configureSystem(MetricsSystemImpl.java:486)

        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.configure(MetricsSystemImpl.java:482)

        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.start(MetricsSystemImpl.java:189)

        at org.apache.hadoop.metrics2.impl.MetricsSystemImpl.init(MetricsSystemImpl.java:164)

        at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.init(DefaultMetricsSystem.java:54)

        at org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.initialize(DefaultMetricsSystem.java:50)

        at org.apache.hadoop.hdfs.qjournal.server.JournalNode.start(JournalNode.java:138)

        at org.apache.hadoop.hdfs.qjournal.server.JournalNode.run(JournalNode.java:126)

        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)

        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)

        at org.apache.hadoop.hdfs.qjournal.server.JournalNode.main(JournalNode.java:296)

Caused by: java.net.UnknownHostException: node104

        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)

        at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)

        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1295)

        at java.net.InetAddress.getLocalHost(InetAddress.java:1471)

        ... 12 more

2016-01-18 22:37:32,342 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).

该问题是由于主机名未改引起的，修改/etc/sysconfig/network文件即可