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From "Navis (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2778) Fail on table sampling
Date Mon, 06 Feb 2012 02:37:59 GMT
Fail on table sampling 
-----------------------

                 Key: HIVE-2778
                 URL: https://issues.apache.org/jira/browse/HIVE-2778
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.9.0
            Reporter: Navis
            Assignee: Navis
             Fix For: 0.9.0


Trying table sampling on any non-empty table throws NPE. This does not occur by test on mini-MR.
{noformat}
select count(*) from emp tablesample (0.1 percent);     
Total MapReduce jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
  set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
  set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
  set mapred.reduce.tasks=<number>
java.lang.NullPointerException
	at org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.sampleSplits(CombineHiveInputFormat.java:450)
	at org.apache.hadoop.hive.ql.io.CombineHiveInputFormat.getSplits(CombineHiveInputFormat.java:403)
	at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:971)
	at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:963)
	at org.apache.hadoop.mapred.JobClient.access$500(JobClient.java:170)
	at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:880)
	at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:833)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127)
	at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:833)
	at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:807)
	at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:432)
	at org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:136)
	at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:134)
	at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
	at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1332)
	at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1123)
	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:931)
	at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:255)
	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:212)
	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
	at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:671)
	at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:554)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:186)
Job Submission failed with exception 'java.lang.NullPointerException(null)'
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MapRedTask

{noformat}

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