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Date: Wed, 21 Jul 2010 17:21:50 -0400 (EDT)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: dev@avro.apache.org
Subject: [jira] Updated: (AVRO-581) java: add reducer that separates keys
 and values when map output is pairs
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     [ https://issues.apache.org/jira/browse/AVRO-581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Doug Cutting updated AVRO-581:
------------------------------

          Status: Resolved  (was: Patch Available)
    Hadoop Flags: [Reviewed]
      Resolution: Fixed

> Could we do a similar thing for the Avro API?

Sure.  I made it so that, with a map-only job, you can call either setOutputSchema() or setMapOutputSchema().

> Otherwise, I'm +1 on this.

Thanks for the reviews!

I just committed this.

> java: add reducer that separates keys and values when map output is pairs
> -------------------------------------------------------------------------
>
>                 Key: AVRO-581
>                 URL: https://issues.apache.org/jira/browse/AVRO-581
>             Project: Avro
>          Issue Type: New Feature
>          Components: java
>            Reporter: Doug Cutting
>            Assignee: Doug Cutting
>             Fix For: 1.4.0
>
>         Attachments: AVRO-581.patch, AVRO-581.patch, AVRO-581.patch, AVRO-581.patch, weather-sorted.avro, weather.avro
>
>
> We should add a Pair<K,V> class, implementing SpecificRecord, that combines instances of two schemas (specific or generic).  Pairs would be compared by key, ignoring value.  The template for its schema would be:
> {code}
> {"type": "record", "name": "org.apache.avro.mapred.Pair", "fields":[
>   {"name": "key", "type":" <<insert key schema here>>},
>   {"name": "value", "order": "ignore", "type": <<insert value schema>>}
> ]}
> {code}
> When map outputs are instances of this class, a reducer may be used whose reduce method is something like:
> public abstract void reduce(K key, Iterable<V> values);

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