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Posted to common-issues@hadoop.apache.org by "Steven Wong (JIRA)" <ji...@apache.org> on 2010/06/26 03:01:53 UTC
[jira] Created: (HADOOP-6842) "hadoop fs -text" does not give a
useful text representation of MapWritable objects
"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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