Hey,
I'm beginner in the hadoop world, and more specifically in Hive (I work on
hive-0.9.0 on Ubuntu). I work on MapR M3 in standalone mode. I'm training
on hive and have some issues with one query :
> SELECT year FROM records;
Automatically selecting local only mode for query
Total MapReduce jobs = 1
Launching Job 1 out of 1
Num 'java.io.FileNotFoundException"ber of reduce tasks is set to 0
since there's no reduce operator
Execution log at:
/tmp/mapr/mapr_20130506044545_e2ba972e-84a5-4e68-a33b-580be4a8d866.log
java.io.FileNotFoundException:
/var/mapr/cluster/mapred/jobTracker/staging/mapr406767829/.staging ()
at org.apache.hadoop.io.nativeio.NativeIO.chmod(Native Method)
at
org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:518)
at
org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:330)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:189)
at
org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:126)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:875)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:869)
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:1126)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:869)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:843)
at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:435)
at org.apache.hadoop.hive.ql.exec.ExecDriver.main(ExecDriver.java:693)
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:197)
Job Submission failed with exception
'java.io.FileNotFoundException(/var/mapr/cluster/mapred/jobTracker/staging/mapr406767829/.staging
())'
Execution failed with exit status: 2
Obtaining error information
Task failed!
Task ID:
Stage-1
Logs:
/tmp/mapr/hive.log
FAILED: Execution Error, return code 2 from
org.apache.hadoop.hive.ql.exec.MapRedTask
But when I tried :
> select * from records;
It works fine. I read that's because there is no reduce tasks in this query.
Any idea?
Thank's
Gautier
