Does it matter if reducer is set even if the no of reducers is 0? Is there
a way to get more clear reason?
On Mon, Feb 27, 2012 at 8:23 PM, Subir S <subir.sasiku...@gmail.com> wrote:
> On Tue, Feb 28, 2012 at 4:30 AM, Mohit Anchlia <mohitanch...@gmail.com
> >wrote:
>
> > For some reason I am getting invocation exception and I don't see any
> more
> > details other than this exception:
> >
> > My job is configured as:
> >
> >
> > JobConf conf = *new* JobConf(FormMLProcessor.*class*);
> >
> > conf.addResource("hdfs-site.xml");
> >
> > conf.addResource("core-site.xml");
> >
> > conf.addResource("mapred-site.xml");
> >
> > conf.set("mapred.reduce.tasks", "0");
> >
> > conf.setJobName("mlprocessor");
> >
> > DistributedCache.*addFileToClassPath*(*new* Path("/jars/analytics.jar"),
> > conf);
> >
> > DistributedCache.*addFileToClassPath*(*new* Path("/jars/common.jar"),
> > conf);
> >
> > conf.setOutputKeyClass(Text.*class*);
> >
> > conf.setOutputValueClass(Text.*class*);
> >
> > conf.setMapperClass(Map.*class*);
> >
> > conf.setCombinerClass(Reduce.*class*);
> >
> > conf.setReducerClass(IdentityReducer.*class*);
> >
>
> Why would you set the Reducer when the number of reducers is set to zero.
> Not sure if this is the real cause.
>
>
> >
> > conf.setInputFormat(SequenceFileAsTextInputFormat.*class*);
> >
> > conf.setOutputFormat(TextOutputFormat.*class*);
> >
> > FileInputFormat.*setInputPaths*(conf, *new* Path(args[0]));
> >
> > FileOutputFormat.*setOutputPath*(conf, *new* Path(args[1]));
> >
> > JobClient.*runJob*(conf);
> >
> > ---------
> > *
> >
> > java.lang.RuntimeException*: Error in configuring object
> >
> > at org.apache.hadoop.util.ReflectionUtils.setJobConf(*
> > ReflectionUtils.java:93*)
> >
> > at
> > org.apache.hadoop.util.ReflectionUtils.setConf(*ReflectionUtils.java:64*)
> >
> > at org.apache.hadoop.util.ReflectionUtils.newInstance(*
> > ReflectionUtils.java:117*)
> >
> > at org.apache.hadoop.mapred.MapTask.runOldMapper(*MapTask.java:387*)
> >
> > at org.apache.hadoop.mapred.MapTask.run(*MapTask.java:325*)
> >
> > at org.apache.hadoop.mapred.Child$4.run(*Child.java:270*)
> >
> > at java.security.AccessController.doPrivileged(*Native Method*)
> >
> > at javax.security.auth.Subject.doAs(*Subject.java:396*)
> >
> > at org.apache.hadoop.security.UserGroupInformation.doAs(*
> > UserGroupInformation.java:1157*)
> >
> > at org.apache.hadoop.mapred.Child.main(*Child.java:264*)
> >
> > Caused by: *java.lang.reflect.InvocationTargetException
> > *
> >
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(*Native Method*)
> >
> > at sun.reflect.NativeMethodAccessorImpl.invoke(*
> > NativeMethodAccessorImpl.java:39*)
> >
> > at
> >
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
> >
>
