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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 16:21:18 GMT
You are also using the @Override annotation to make sure that your
overridden method is being called?

Regards,
Shahab


On Thu, Aug 29, 2013 at 12:03 PM, praveenesh kumar <praveenesh@gmail.com>wrote:

> Thanks Shahab for replying. Sorry, that was  typo, while writing the code
> snippet. Even keeping the keys as NullWritable or LongWritable i.e. by
> keeping the same types of keys, I am getting the same error.
> I don't think the error is at Map Input side. Its saying "value from map".
> Can't understand where I am going wrong.
>
> Regards
> Praveenesh
>
>
> On Thu, Aug 29, 2013 at 4:58 PM, Shahab Yunus <shahab.yunus@gmail.com
> >wrote:
>
> > "....
> > public class MYHBaseLoader extends
> > Mapper<*NullWritable*,BytesWritable,NullWritable,Put> {
> >
> >      protected void map (*LongWritable* key, BytesWritable value, Context
> > context) throws IOException, InterruptedException {
> > ..."
> >
> > Why is the difference in types of the keys?
> >
> > Regards,
> > Shahab
> >
> >
> > On Thu, Aug 29, 2013 at 5:46 AM, 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
> > >
> >
>

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