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From "Brandon Forehand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-6842) "hadoop fs -text" does not give a useful text representation of MapWritable objects
Date Thu, 18 Jul 2013 22:02:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712939#comment-13712939

Brandon Forehand commented on HADOOP-6842:

I too would find this patch really useful. I've ran into this exact issue using sequence files
containing MapWritables. I think delegating to the {{instance.toString()}} will just work
even without using the {{new TreeMap}} invocation.

It's been 3 years since this bug was reported, and it appears to be a one line fix. Is there
anyone willing to make this change?
> "hadoop fs -text" does not give a useful text representation of MapWritable objects
> -----------------------------------------------------------------------------------
>                 Key: HADOOP-6842
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6842
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    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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