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Li Lu commented on MAPREDUCE-6110: ---------------------------------- Sure, will take a look at it soon... Sorry about the delay... > JobHistoryServer CLI throws NullPointerException with job ids that do not > exist > ------------------------------------------------------------------------------- > > Key: MAPREDUCE-6110 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6110 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: jobhistoryserver > Reporter: Li Lu > Assignee: Kai Sasaki > Priority: Minor > Attachments: MAPREDUCE-6110.01.patch, MAPREDUCE-6110.02.patch > > > When using JobHistoryServer CLI to query a job id that does not exist on the > server, it may throw NullPointerException sometimes. > I tried "mapred job -events <some_wrong_jobId> 0 100", and the result was: > Exception in thread "main" java.lang.NullPointerException > at org.apache.hadoop.mapreduce.tools.CLI.listEvents(CLI.java:487) > at org.apache.hadoop.mapreduce.tools.CLI.run(CLI.java:316) > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84) > at org.apache.hadoop.mapred.JobClient.main(JobClient.java:1237) > Similar symptoms also appear with -list-attempt-ids, but were fine with > -status and -set-priority. > I traced back to CLI.listEvents, and line 487 is: > {code} > TaskCompletionEvent[] events = job. > getTaskCompletionEvents(fromEventId, numEvents); > {code} > The job object is obtained from JobID.forName(jobid)) (line 316), which will > return null if the job does not exist on server. > Maybe we want to have some behaviors consistent with -status here, by simply > reporting jobId does not exist? -- This message was sent by Atlassian JIRA (v6.3.4#6332)