And your custom input shd also be a static class.
The warning suggests you to implement the Tool interface. It is another way
to start your MR job.
The syntax is:
public class <YourClass> extends Configured implements Tool {
/// Define mapper/reducer classes....
and override the run(String s[]) method (in this method, you configure your
job object and then invoke the runJob method of JobClient class.
// in the main method, invoke the run method.
HTH,
Himanshu
On Wed, Jul 28, 2010 at 10:02 AM, Erik Test <[email protected]> wrote:
> Thank you for the answer. I am aware of this and have been looking how to
> solve this issue in other places because I'm already providing a no arg
> constructor.
>
> However, I'm still curious what this warning message means. Can someone
> tell
> me what this warning means?
>
> Erik
>
>
> On 28 July 2010 11:57, Himanshu Vashishtha <[email protected]> wrote:
>
> > Hello,
> > The exception is not related to the warning message.
> >
> > It is a Reflection error. You have defined a custom Input format. Provide
> a
> > no arg constructor and then test.
> >
> > On Wed, Jul 28, 2010 at 9:42 AM, Erik Test <[email protected]>
> wrote:
> >
> > > Hello,
> > >
> > > I'm getting the following messages when I try to run a job I've
> > developed.
> > >
> > > hadoop jar distanceCalc.jar DistanceCalc distanceCalculations
> > > distanceCalculations/output9
> > >
> > > 10/07/28 09:25:37 WARN mapred.JobClient: Use GenericOptionsParser for
> > > parsing the arguments. Applications should implement Tool for the same.
> > >
> > > Exception in thread "main" java.lang.RuntimeException:
> > > java.lang.NoSuchMethodException:
> > > DistanceCalc$DistanceValuesInputFormat.<init>()
> > > at
> > >
> > >
> >
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:115)
> > > at
> > org.apache.hadoop.mapred.JobConf.getInputFormat(JobConf.java:400)
> > > at
> > > org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:810)
> > > at
> > >
> org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:781)
> > > at
> > org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:730)
> > > at
> org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1249)
> > > at DistanceCalc.main(DistanceCalc.java:228)
> > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > > at
> > >
> > >
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > > at
> > >
> > >
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > > at java.lang.reflect.Method.invoke(Method.java:597)
> > > at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> > > Caused by: java.lang.NoSuchMethodException:
> > > DistanceCalc$DistanceValuesInputFormat.<init>()
> > > at java.lang.Class.getConstructor0(Class.java:2706)
> > > at java.lang.Class.getDeclaredConstructor(Class.java:1985)
> > > at
> > >
> > >
> >
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:109)
> > > ... 11 more
> > >
> > > I'm obviously doing something wrong in the code but my question for
> this
> > > thread is the warning message I'm receiving. I'm not quite sure what
> it
> > > means and what I've seen on google so far is the warning has something
> to
> > > do
> > > with Pig but I'm not using Pig. Can someone tell me what the warning
> > means
> > > please?
> > >
> > > Thanks for your time
> > >
> > > Erik
> > >
> >
>
