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From Shahab Yunus <shahab.yu...@gmail.com>
Subject Re: java.io.IOException: Type mismatch in value from map: expected org.apache.hadoop.hbase.client.Put, recieved org.apache.hadoop.io.BytesWritable
Date Thu, 29 Aug 2013 17:31:14 GMT
Exactly I had the same though as Ashwanth too, that is why I asked whether
@Override annotation is being used or not.

Regards,
Shahab


On Thu, Aug 29, 2013 at 1:09 PM, Ashwanth Kumar <
ashwanthkumar@googlemail.com> wrote:

> Hey Praveenesh, I am not sure if this would help.
>
> But can you try moving your mapper to an inner class / separate class and
> try the code? I somehow get a feeling that default Mapper (IdentityMapper)
> is being used (may be you can check the mapreduce.map.class value?), that
> would be the only reason why your value (BytesWritable) gets emitted out in
> context.write().
>
>
>
> On Thu, Aug 29, 2013 at 3:16 PM, praveenesh kumar <praveenesh@gmail.com
> >wrote:
>
> > Hi all,
> >
> > I am trying to write a MR code to load a HBase table.
> >
> > I have a mapper that emits (null,put object) and I am using
> > TableMapReduceUtil.initTableReducerJob() to write it into a HBase table.
> >
> > Following is my code snippet
> >
> > public class MYHBaseLoader extends
> > Mapper<NullWritable,BytesWritable,NullWritable,Put> {
> >
> >      protected void map (LongWritable key, BytesWritable value, Context
> > context) throws IOException, InterruptedException {
> >
> >       /****----- Some processing here.. Create put object and pushing it
> > into Put object).
> >         context.write(null, put);// Pushing the put object.
> >
> >     }
> >
> >     public static void main (String args[]) throws IOException,
> > ClassNotFoundException, InterruptedException{
> >         Configuration conf = new Configuration();
> >         Job job = new Job(conf);
> >         job.setJarByClass(MYHBaseLoader.class);
> >         job.setMapperClass(MYHBaseLoader.class);
> >
> >
> >
> TableMapReduceUtil.initTableReducerJob(MY_IMPORT_TABLE_NAME,IdentityTableReducer.class,job);
> >         job.setMapOutputKeyClass(NullWritable.class);
> >         job.setMapOutputValueClass(Put.class);
> >         job.setInputFormatClass(SequenceFileInputFormat.class);
> >         //job.setNumReduceTasks(0);
> >
> >         FileInputFormat.setInputPaths(job, new Path("test"));
> >         Path outputPath = new Path("test_output");
> >         FileOutputFormat.setOutputPath(job,outputPath);
> >
> >         //outputPath.getFileSystem(conf).delete(outputPath, true);
> >
> >         job.waitForCompletion(true);
> >         System.out.println("Done");
> >     }
> >
> >
> > I am getting the following error while running. Any help/guidance:
> >
> >
> > java.io.IOException: Type mismatch in value from map: expected
> > org.apache.hadoop.hbase.client.Put, recieved
> > org.apache.hadoop.io.BytesWritable
> >     at
> >
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:1023)
> >     at
> >
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:689)
> >     at
> >
> >
> org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
> >     at org.apache.hadoop.mapreduce.Mapper.map(Mapper.java:124)
> >     at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
> >     at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)
> >     at org.apache.hadoop.mapred.MapTask.run(MapTask.java:363)
> >     at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> >     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:1232)
> >     at org.apache.hadoop.mapred.Child.main(Child.java:249)
> >
> >
> > Regards
> > Praveenesh
> >
>
>
>
> --
>
> Ashwanth Kumar / ashwanthkumar.in
>

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