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From Sean Owen <sro...@gmail.com>
Subject Re: Mahout startup errors
Date Wed, 02 Jan 2013 13:32:44 GMT
(I mean, CDH*4* = Hadoop 2.x)

It's not like there are big differences, and in fact it all should be
compile-time-compatible. But not necessarily run-time compatible, I
find for sure.

On Wed, Jan 2, 2013 at 1:32 PM, Sean Owen <srowen@gmail.com> wrote:
> I think you've done the right thing. The project doesn't support
> Hadoop 2.x, and CDH = Hadoop 2.x.
>
> On Wed, Jan 2, 2013 at 1:11 PM, Sloot, Hans-Peter
> <hans-peter.sloot@atos.net> wrote:
>> Hello all,
>>
>> I have installed Clouder cdh4 and added the mahout rpm afterwards.
>>
>> When starting mahout I see the following output.
>>
>> MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
>> Running on hadoop, using /usr/lib/hadoop-0.20-mapreduce/bin/hadoop and HADOOP_CONF_DIR=/etc/hadoop/conf
>> MAHOUT-JOB: /usr/lib/mahout/mahout-examples-0.6-cdh4.0.1-job.jar
>> Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/util/PlatformName
>> Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.PlatformName
>>         at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>>         at java.security.AccessController.doPrivileged(Native Method)
>>         at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>>         at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>>         at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
>> Could not find the main class: org.apache.hadoop.util.PlatformName.  Program will
exit.
>> Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/util/RunJar
>> Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.RunJar
>>         at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>>         at java.security.AccessController.doPrivileged(Native Method)
>>         at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>>         at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>>         at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
>> Could not find the main class: org.apache.hadoop.util.RunJar.  Program will exit.
>>
>> Apparently the main issue is that mahout cannot find the classes PlatformName and
RunJar
>>
>> I looked around and found that these classes are in /usr/lib/hadoop/hadoop-common-2.0.0-cdh4.0.1.jar
>>
>> Since /usr/bin/mahout is a shell script I added the jar to the HADOOP_CLASSPATH variable
in it.
>> export HADOOP_CLASSPATH="/usr/lib/mahout/mahout-examples-*-job.jar":/usr/lib/hadoop/hadoop-common-2.0.0-cdh4.0.1.jar:$HADOOP_CLASSPATH
>>
>> Is there a ‘official’ way to get the configuration right?
>>
>> When starting it without any parameters it now shows:
>> [nl19856@nlvora150 ~]$ mahout
>> MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
>> Running on hadoop, using /usr/lib/hadoop-0.20-mapreduce/bin/hadoop and HADOOP_CONF_DIR=/etc/hadoop/conf
>> MAHOUT-JOB: /usr/lib/mahout/mahout-examples-0.6-cdh4.0.1-job.jar
>> SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
>> SLF4J: Defaulting to no-operation (NOP) logger implementation
>> SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
>> An example program must be given as the first argument.
>> Valid program names are:
>>   arff.vector: : Generate Vectors from an ARFF file or directory
>>   baumwelch: : Baum-Welch algorithm for unsupervised HMM training
>>   canopy: : Canopy clustering
>>   cat: : Print a file or resource as the logistic regression models would see it
>> .. etc..
>>   vectordump: : Dump vectors from a sequence file to text
>>   viterbi: : Viterbi decoding of hidden states from given output states sequence
>>   wikipediaDataSetCreator: : Splits data set of wikipedia wrt feature like country
>>   wikipediaXMLSplitter: : Reads wikipedia data and creates ch
>> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
>>         at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:119)
>>         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:208)
>>
>> Do I need to change the configuration for this too?
>>
>> Regards Hans-Peter
>>
>>
>>
>>
>>
>>
>>
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