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https://issues.apache.org/jira/browse/BIGTOP-1470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14154214#comment-14154214
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jay vyas edited comment on BIGTOP-1470 at 10/1/14 1:54 AM:
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red herring. sorry, i deleted that comment on purpose to precent distracting
you guys :)
the main info is in the comment above which confirms that im able to run romans
tes successfully, but that other jobs seem to expose the classnotfound error
readily.
was (Author: jayunit100):
red herring. sorry, i deleted that comment on purpose to precent distracting
you guys :)
> Mahout 0.9 couldn't work with hadoop 2.x
> ----------------------------------------
>
> Key: BIGTOP-1470
> URL: https://issues.apache.org/jira/browse/BIGTOP-1470
> Project: Bigtop
> Issue Type: Bug
> Components: build
> Affects Versions: 0.8.0
> Reporter: Hu Liu,
> Priority: Blocker
>
> I built Mahout 0.9 with Bigtop and found it couldn't work with hadoop 2.x.
> {code}
> 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:73)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:164)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.main(RecommenderJob.java:322)
> 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.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:72)
> at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
> at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:152)
> at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:195)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
> {code}
> The root cause is that bigtop uses the wrong parameter hadoop2.version when
> building Mahout.
> {code}
> mvn clean install -Dmahout.skip.distribution=false -DskipTests
> -Dhadoop2.version=$HADOOP_VERSION "$@"
> {code}
> For Mahout 0.9 , the correct property is hadoop.version in pom.xml of Mahout
> 0.9
> {code}
> <hadoop.version>1.2.1</hadoop.version>
> {code}
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