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https://issues.apache.org/jira/browse/HIVE-2778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229698#comment-13229698
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Carl Steinbach commented on HIVE-2778:
--------------------------------------
@Navis: Can you please grant license rights to the ASF? Patch looks good
otherwise. Thanks.
> 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
> Environment: Reproduced only on hadoop-0.20.2-CDH3u1, work fine on
> hadoop-0.20.2
> Reporter: Navis
> Assignee: Navis
> Fix For: 0.9.0
>
> Attachments: HIVE-2778.D1593.1.patch, HIVE-2778.D1593.2.patch
>
>
> 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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