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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-1722) Make streaming to handle non-utf8 byte array
Date Sun, 01 Jul 2012 16:11:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404754#comment-13404754
] 

eric baldeschwieler commented on HADOOP-1722:
---------------------------------------------

This does seem like a bug.  I'd expect the combiner to ignore the output property and always
issue its output in the same format as its input.  So this shouldn't require new properties
unless I'm confused.
                
> Make streaming to handle non-utf8 byte array
> --------------------------------------------
>
>                 Key: HADOOP-1722
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1722
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Runping Qi
>            Assignee: Klaas Bosteels
>             Fix For: 1.0.2, 0.21.0
>
>         Attachments: HADOOP-1722-branch-0.18.patch, HADOOP-1722-branch-0.19.patch, HADOOP-1722-v0.20.1.patch,
HADOOP-1722-v2.patch, HADOOP-1722-v3.patch, HADOOP-1722-v4.patch, HADOOP-1722-v4.patch, HADOOP-1722-v5.patch,
HADOOP-1722-v6.patch, HADOOP-1722.patch
>
>
> Right now, the streaming framework expects the output sof the steam process (mapper or
reducer) are line 
> oriented UTF-8 text. This limit makes it impossible to use those programs whose outputs
may be non-UTF-8
>  (international encoding, or maybe even binary data). Streaming can overcome this limit
by introducing a simple
> encoding protocol. For example, it can allow the mapper/reducer to hexencode its keys/values,

> the framework decodes them in the Java side.
> This way, as long as the mapper/reducer executables follow this encoding protocol, 
> they can output arabitary bytearray and the streaming framework can handle them.

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