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Date: Mon, 22 Apr 2013 19:35:15 +0000 (UTC)
From: "Mina Naguib (JIRA)" <jira@apache.org>
To: dev@avro.apache.org
Message-ID: <JIRA.12643853.1366587387303.203350.1366659315879@arcas>
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Subject: [jira] [Commented] (AVRO-1306) Clarify documentation for hadoop
 input-avro output-non-avro instructions
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    [ https://issues.apache.org/jira/browse/AVRO-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13638360#comment-13638360 ] 

Mina Naguib commented on AVRO-1306:
-----------------------------------

Hi Doug

I don't think AvroReducer is involved here.  The patch is for the section of the doc titled:
{code}
For jobs whose input is an Avro data file and which use an AvroMapper, but whose reducer is a non-Avro Reducer and whose output is a non-Avro format
{code}

In this case, I had an AvroMapper, and a vanilla hadoop reducer (input AvroKey/AvroValue, output Text/IntWritable).  Since the output is not AvroKey/AvroValue, it's not suitable for being used as a combiner, as it's output can't be re-fed into its input.

                
> Clarify documentation for hadoop input-avro output-non-avro instructions
> ------------------------------------------------------------------------
>
>                 Key: AVRO-1306
>                 URL: https://issues.apache.org/jira/browse/AVRO-1306
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>    Affects Versions: 1.7.5
>            Reporter: Mina Naguib
>            Priority: Minor
>              Labels: documentation, patch
>         Attachments: input_avro_output_nonavro_doc_update.diff
>
>
> The documentation for hadoop usage (input avro, output non-avro) is misleading, as the Reducer is likely not usable as a combiner.  Attached patch clarifies documentation.

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