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From "Michael Fuchs (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5084) Output data not written to disk
Date Tue, 20 Jan 2009 09:45:59 GMT
Output data not written to disk

                 Key: HADOOP-5084
                 URL: https://issues.apache.org/jira/browse/HADOOP-5084
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.18.2
         Environment: Linux version 2.6.22-12-generic (buildd@vernadsky) (gcc version 4.1.3
20070831 (prerelease) (Ubuntu 4.1.2-16ubuntu1)) #1 SMP Sun Sep 23 18:11:30 GMT 2007 running
Hadoop 18.2 on two nodes
            Reporter: Michael Fuchs
            Priority: Critical

I run into an critical issues with Hadoop 18.2 on my Linux boxes:

The jobs executes without any complains and they are listed in the
succeeded list but there is no output data beside the "_logs" directory.
The same code works with .17.2.1

Here are some sections of the logs:

hadoop@bock:~/logs$ tail hadoop-hadoop-jobtracker-bock.log

2008-12-23 13:30:56,707 INFO org.apache.hadoop.mapred.JobInProgress:
Choosing a data-local task task_200812231229_0031_m_000001 for

2008-12-23 13:30:56,707 INFO org.apache.hadoop.mapred.JobTracker: Adding
task 'attempt_200812231229_0031_m_000001_1' to tip
task_200812231229_0031_m_000001, for tracker

2008-12-23 13:31:01,065 INFO org.apache.hadoop.mapred.JobInProgress:
Task 'attempt_200812231229_0031_m_000001_1' has completed
task_200812231229_0031_m_000001 successfully.

2008-12-23 13:31:03,177 INFO org.apache.hadoop.mapred.TaskRunner: Saved
output of task 'attempt_200812231229_0031_r_000000_0' to


But the folder contains only a "_logs" folder which has a history file
which contains:


Job JOBID="job_200812231415_0001" FINISH_TIME="1230038377844"
FAILED_MAPS="0" FAILED_REDUCES="0" COUNTERS="Job Counters .Data-local
map tasks:2,Job Counters .Launched reduce tasks:1,Job Counters .Launched
map tasks:3,Map-Reduce Framework.Reduce input records:61,Map-Reduce
Framework.Map output records:61,Map-Reduce Framework.Map output
bytes:7194,Map-Reduce Framework.Combine output records:0,Map-Reduce
Framework.Map input records:61,Map-Reduce Framework.Reduce input
groups:12,Map-Reduce Framework.Combine input records:0,Map-Reduce
Framework.Map input bytes:36396,Map-Reduce Framework.Reduce output
records:12,File Systems.HDFS bytes written:1533,File Systems.Local bytes
written:14858,File Systems.HDFS bytes read:38679,File Systems.Local

So what I see is that the system runs successful and it even says it
writes data! ("Map-Reduce Framework.Reduce output records:12,File Systems.HDFS bytes written:1533")

If I run the same code with .17.2.1 or in local mode with .18.2 it works
and I get a part-0000 file with the expected data.

Please tell me if you need additional information.

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