i have some java systems that i want to use hadoop in with it, but whenever i connect to localhost with this command

hadoop fs -ls /

it will always prompt that

java.net.UnknownHostException: local.localdomain: diginiqlinux.localdomain

at java.net.InetAddress.getLocalHost(InetAddress.java:1466)

edit

here is my //etc/hosts

127.0.0.1 localhost

full trace log

[root@diginiqlinux ~]# hadoop fs -ls

13/12/30 16:44:36 INFO metrics.MetricsUtil: Unable to obtain hostName

java.net.UnknownHostException: diginiqlinux.localdomain: diginiqlinux.localdomai                                                                                        n

        at java.net.InetAddress.getLocalHost(InetAddress.java:1466)

        at org.apache.hadoop.metrics.MetricsUtil.getHostName(MetricsUtil.java:91                                                                                        )

        at org.apache.hadoop.metrics.MetricsUtil.createRecord(MetricsUtil.java:8                                                                                        0)

        at org.apache.hadoop.security.UserGroupInformation$UgiMetrics.<init>(Use                                                                                        rGroupInformation.java:102)

        at org.apache.hadoop.security.UserGroupInformation.<clinit>(UserGroupInf                                                                                        ormation.java:208)

        at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1757                                                                                        )

        at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:1750                                                                                        )

        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1618)

        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:255)

        at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:124)

        at org.apache.hadoop.fs.FsShell.init(FsShell.java:86)

        at org.apache.hadoop.fs.FsShell.run(FsShell.java:1813)

        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)

        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)

        at org.apache.hadoop.fs.FsShell.main(FsShell.java:1974)

Caused by: java.net.UnknownHostException: diginiqlinux.localdomain

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

        at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:894)

        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:128                                                                                        6)

        at java.net.InetAddress.getLocalHost(InetAddress.java:1462)

        ... 14 more

ls: Cannot access .: No such file or directory.

any solution how to connect localhost?