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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