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From "Steven Wong (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6842) "hadoop fs -text" does not give a useful text representation of MapWritable objects
Date Sat, 26 Jun 2010 01:01:53 GMT
"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.MapWritable@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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