How to solve "The HADOOP job failed to complete. Check the HADOOP log files for job 1 for more information."

Hadoop version 1.2.1 Matlab version 2015a

Linux ubuntu 14.

At first, I try to run them at a cluster (one master and two slaves). I can run the example 'wordcount'in Hadoop. And it is success to read the data from the HDFS through the Matlab.

But when I try to run the example in Matlab 'Run mapreduce on a Hadoop Cluster',I failed.

It shows that the Map 0% and Reduce 0%.

Error using mapreduce (line 100)

The HADOOP job failed to complete. Check the HADOOP log files for job 1 for more information.

Error in run_mapreduce_on_a_hadoop (line 24)

meanDelay = mapreduce(ds,@meanArrivalDelayMapper,@meanArrivalDelayReducer,mr,...

There is my Matlab codes

setenv('HADOOP_HOME','/usr/local/hadoop');

cluster = parallel.cluster.Hadoop;

cluster.HadoopProperties('mapred.job.tracker') = 'ubuntu:50031';

cluster.HadoopProperties('fs.default.name') = 'hdfs://ubuntu:8020';

outputFolder = '/home/rjy/logs/hadooplog';

mr = mapreducer(cluster);

ds = datastore('airlinesmall.csv','TreatAsMissing','NA',... 'SelectedVariableNames','ArrDelay','ReadSize',1000);

preview(ds)

meanDelay = mapreduce(ds,@meanArrivalDelayMapper,@meanArrivalDelayReducer,mr,... 'OutputFolder',outputFolder)

I don't know what it means in this logs as follows,

2015-08-14 22:41:40,981 INFO org.apache.hadoop.mapred.JobInProgress: Choosing a failed task

task_201508142238_0001_m_000000

2015-08-14 22:41:40,982 INFO org.apache.hadoop.mapred.JobTracker: Adding task (MAP)

'attempt_201508142238_0001_m_000000_3' to tip task_201508142238_0001_m_000000, for tracker

'tracker_slave1:localhost/127.0.0.1:41664'

2015-08-14 22:41:40,982 INFO org.apache.hadoop.mapred.JobInProgress: Choosing rack-local task

task_201508142238_0001_m_000000

2015-08-14 22:41:40,982 INFO org.apache.hadoop.mapred.JobTracker: Removing task 'attempt_201508142238_0001_m_000000_2'

2015-08-14 22:41:42,855 INFO org.apache.hadoop.mapred.TaskInProgress: Error from attempt_201508142238_0001_m_000000_3:

com.mathworks.toolbox.parallel.hadoop.MatlabStartupFailureException: parallel:mapreduce:HadoopTaskCouldNotFindMatlab

Caused by: java.lang.ClassNotFoundException: com.mathworks.toolbox.distcomp.util.Version

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

How to solve this problem? Thanks a lot.

I attach my Hadoop logs and Matlab logs.