Hi, When I tried to run the demo of Rowcounter.java, which is a demo of mapreduce, the console printed something beblow.
20/03/24 14:19:29 INFO mapreduce.JobSubmitter: number of splits:1 20/03/24 14:19:31 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1585019845649_0001 20/03/24 14:19:31 INFO mapreduce.JobSubmitter: java.lang.NullPointerException 20/03/24 14:19:34 INFO mapreduce.JobSubmitter: Cleaning up the staging area /tmp/hadoop-yarn/staging/root/.staging/job_1585019845649_0001 Exception in thread "main" java.lang.NullPointerException at org.apache.hadoop.security.token.Token.write(Token.java:221) at org.apache.hadoop.security.Credentials.write(Credentials.java:252) at org.apache.hadoop.security.Credentials.writeTokenStorageToStream(Credentials.java:230) at org.apache.hadoop.mapred.YARNRunner.createApplicationSubmissionContext(YARNRunner.java:397) at org.apache.hadoop.mapred.YARNRunner.submitJob(YARNRunner.java:296) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:240) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1746) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308) at com.tools.mr.RowCounter.run(RowCounter.java:129) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84) at com.tools.mr.RowCounter.main(RowCounter.java:173) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.util.RunJar.run(RunJar.java:221) at org.apache.hadoop.util.RunJar.main(RunJar.java:136) Information about my development environment, Jkd 1.7, Haoop 2.7.4, Kudu 1.5. There is configuration about authentication of the kudu cluster. The demo could run by using cmd like 'java -jar xxx.jar'. But when I submitted it to the Hadoop cluster by using 'hadoop jar', the application's log show "java.lang.NullPointerException", and the application ended. Any tips about how to solve the null point exception when running the demo at Hadoop cluster? Best Regards, zhu si cheng.
