FAQ
I can not run any map reduce jobs on a new hadoop cluster. I am only using
Hive at the moment. I have loaded several tables with data fromt the local
fs. Although a select count(*) or any query that kicks off a mapred job
fails with the below messages. I installed CDH4 using the cloudera manager
and I am running a two node cluster with centos 5.8. Both boxes are farily
light weight as this is a POC, they are virtual single core with 2GB of RAM
each. I have pretty much chmod 777'ed everything on the local and hdfs
side. I set my ulimit to: *hard nofile 16384. I am at a lost. Please let me
know if any additional information will be useful, this is all fairly new
to me.

Thanks much!

Hive command line error>>>>
Hadoop job information for Stage-1: number of mappers: 2; number of
reducers: 1
2012-09-12 20:42:30,460 Stage-1 map = 100%, reduce = 100%
Ended Job = job_201209122034_0001 with errors
Error during job, obtaining debugging information...
Examining task ID: task_201209122034_0001_m_000003 (and more) from job
job_201209122034_0001
null
FAILED: Execution Error, return code 2 from
org.apache.hadoop.hive.ql.exec.MapRedTask
MapReduce Jobs Launched:
Job 0: Map: 2 Reduce: 1 HDFS Read: 0 HDFS Write: 0 FAIL
Total MapReduce CPU Time Spent: 0 msec

JobTracker>>
Error from attempt_201209122034_0001_m_000002_2: java.lang.Throwable: Child
Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:242)
Caused by: java.io.IOException: Task process exit with nonzero status of
126.
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:229)

taskTracker>>
Task wrapper stderr: bash:
/data/mapred/ttprivate/taskTracker/root/jobcache/job_201209122034_0001/attempt_201209122034_0001_r_000001_0/taskjvm.sh:
Permission denied

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postedSep 12, '12 at 5:19p
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