Hi Barrie, We were not able to solve this issue. Hence we decided to install Apache hadoop 1.04 version.
Thanks, Rohit On Wed, Sep 18, 2013 at 8:32 AM, B Kersbergen <[email protected]> wrote: > Hi Rohit > > I also run into the IncompatibleClassChangeError when using the streaming k > means feature. Apparently this only applies to some parts of the code base > because I have not run into this issue with other distributed > functionalities of mahout. > Were you able to solve this? If so, what were the specific parameters that > you used to build mahout? > > I'm using CDH4.3.0-mr1 client and cluster. > Kind regards, > Barrie > > > 2013/9/12 Gokhan Capan <[email protected]> > > > You might also need to build mahout using hadoop-0.23 profile with > > hadoop.version parameter set to your hadoop version. > > > > Gokhan > > > > > > On Tue, Sep 10, 2013 at 10:09 PM, Parimi Rohit <[email protected] > > >wrote: > > > > > Thanks Sean. Will look into that. > > > > > > Rohit > > > > > > > > > On Tue, Sep 10, 2013 at 1:32 PM, Sean Owen <[email protected]> wrote: > > > > > > > You are trying to run on Hadoop 2 and Mahout only works with Hadoop 1 > > and > > > > related branches. This wont work. > > > > > > > > However the CDH distributions also come in an 'mr1' flavor that > stands > > a > > > > much better chance of working with something that is built for Hadoop > > 1. > > > > Use 2.0.0-mr1-4.3.1 instead. (PS 4.3.2 and 4.4.0 are available now) > > > > > > > > You will likely still have to compile Mahout again with this > different > > > > dependency to get it to work but with any luck that's it. > > > > > > > > Sean > > > > On Sep 10, 2013 6:34 PM, "Parimi Rohit" <[email protected]> > > wrote: > > > > > > > > > Hi All, > > > > > > > > > > I am used to running mahout (mahout-core-0.9-SNAPSHOT-job.jar) in > the > > > > > Apache Hadoop environment, however, we had to switch to Cloudera > > > > > distribution. > > > > > > > > > > When I try to run the item based collaborative filtering job > > > > > (org.apache.mahout.cf.taste.hadoop.item.RecommenderJob) in the > > Cloudera > > > > > distribution, I get the following error, > > > > > > > > > > Exception in thread "main" java.lang.IncompatibleClassChangeError: > > > Found > > > > > interface org.apache.hadoop.mapreduce.JobContext, but class was > > > expected > > > > > at > > > > > > > > > org.apache.mahout.common.HadoopUtil.getCustomJobName(HadoopUtil.java:174) > > > > > at > > > > > > org.apache.mahout.common.AbstractJob.prepareJob(AbstractJob.java:614) > > > > > at > > > > > > > > > > > > > > > > > > > > org.apache.mahout.cf.taste.hadoop.preparation.PreparePreferenceMatrixJob.run(PreparePreferenceMatrixJob.java:75) > > > > > at > org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) > > > > > at > > > > > > > > > > > > > > > > > > > > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:158) > > > > > at > org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) > > > > > at > > > > > > > > > > > > > > > > > > > > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.main(RecommenderJob.java:312) > > > > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native > > Method) > > > > > at > > > > > > > > > > > > > > > > > > > > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) > > > > > at > > > > > > > > > > > > > > > > > > > > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > > > > > at java.lang.reflect.Method.invoke(Method.java:606) > > > > > at org.apache.hadoop.util.RunJar.main(RunJar.java:208) > > > > > > > > > > Is there a way to run Mahout in the Cloudera environment? I mean, a > > > > > download specific to Cloudera distribution of Hadoop? > > > > > > > > > > Thanks in advance, > > > > > Rohit > > > > > > > > > > > > > > >
