hi Ted, i am using single node setup. this DNS issue turns up only incase of HBASE TableMapper , where as other map-reduce jobs running perfectly.
i don't understand the actual theory behind it. On Sat, Feb 8, 2014 at 8:21 PM, Ted Yu <yuzhih...@gmail.com> wrote: > Are you using single node deployment ? > > Please configure DNS on the node. > > Cheers > > On Feb 8, 2014, at 6:46 AM, yeshwanth kumar <yeshwant...@gmail.com> wrote: > > > hi > > > > i am using hbase 94.10 and hadoop 1.2.1 > > trying to run couple of map-reduce jobs on hbase by TableMapper, > > i am getting this exception > > > > do i really need to configure DNS on local.? > > can someone help me with this issue. > > > > Exception in thread "main" java.lang.NullPointerException > > at org.apache.hadoop.net.DNS.reverseDns(DNS.java:79) > > at > > > org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.reverseDNS(TableInputFormatBase.java:219) > > at > > > org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.getSplits(TableInputFormatBase.java:184) > > at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:1054) > > at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1071) > > at org.apache.hadoop.mapred.JobClient.access$700(JobClient.java:179) > > at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:983) > > at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:936) > > at java.security.AccessController.doPrivileged(Native Method) > > at javax.security.auth.Subject.doAs(Subject.java:415) > > at > > > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190) > > at > org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:936) > > at org.apache.hadoop.mapreduce.Job.submit(Job.java:550) > > at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580) > > at > > > com.serendio.penton.hbase.mapping.DataScrubbingMR.main(DataScrubbingMR.java:233) > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > > at > > > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) > > at > > > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > > at java.lang.reflect.Method.invoke(Method.java:606) > > at org.apache.hadoop.util.RunJar.main(RunJar.java:160) > > > > > > Thanks, > > Yeshwanth >
