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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-6842) "hadoop fs -text" does not give a useful text representation of MapWritable objects
Date Wed, 06 May 2015 17:44:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Akira AJISAKA updated HADOOP-6842:
----------------------------------
    Attachment: HADOOP-6842.002.patch

v2 patch
* Make {{toString()}} method to public
* Add a regression test

> "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
>            Assignee: Akira AJISAKA
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-6842.002.patch, HADOOP-6842.patch
>
>
> 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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