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Hadoop, mail # user - Invocation exception


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Re: Invocation exception
Mohit Anchlia 2012-02-28, 05:40
On Mon, Feb 27, 2012 at 8:58 PM, Prashant Kommireddi <[EMAIL PROTECTED]>wrote:

> Tom White's Definitive Guide book is a great reference. Answers to
> most of your questions could be found there.
>
> I've been through that book but haven't come accross how to debug this
exception. Can you point me to the topic in that book where I'll find this
information?
> Sent from my iPhone
>
> On Feb 27, 2012, at 8:54 PM, Mohit Anchlia <[EMAIL PROTECTED]> wrote:
>
> > 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 <[EMAIL PROTECTED]>
> wrote:
> >
> >> On Tue, Feb 28, 2012 at 4:30 AM, Mohit Anchlia <[EMAIL PROTECTED]
> >>> 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
> >>>
> >>
>