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Posted to common-issues@hadoop.apache.org by "DeepakVohra (JIRA)" <ji...@apache.org> on 2013/07/03 16:32:21 UTC

[jira] [Created] (HADOOP-9697) Mapper example

DeepakVohra created HADOOP-9697:
-----------------------------------

             Summary: Mapper example
                 Key: HADOOP-9697
                 URL: https://issues.apache.org/jira/browse/HADOOP-9697
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: DeepakVohra
            Priority: Minor


The org.apache.hadoop.mapreduce 
Class Mapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

has an example with 
public void map(Object key, Text value, Context context)

But, "Any type which is to be used as a key in the Hadoop Map-Reduce framework should implement this interface."
org.apache.hadoop.io 
Interface WritableComparable<T>

The example has Object for key type. Object doesn't implement WritableComparable.

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