"hadoop fs -text" does not give a useful text representation of MapWritable 
objects
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                 Key: HADOOP-6842
                 URL: https://issues.apache.org/jira/browse/HADOOP-6842
             Project: Hadoop Common
          Issue Type: Improvement
    Affects Versions: 0.20.0
            Reporter: Steven Wong


If a sequence file contains MapWritable objects, running "hadoop fs -text" on 
the file prints the following for each MapWritable:

org.apache.hadoop.io.mapwrita...@4f8235ed

To be more useful, it should print out the contents of the map instead. This 
can be done by adding a toString method to MapWritable, i.e. something like:

public String toString() {
    return (new TreeMap<Writable, Writable>(instance)).toString();
}


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