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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1230) Replace parameters with context objects in Mapper, Reducer, Partitioner, InputFormat, and OutputFormat classes
Date Thu, 26 Jun 2008 12:49:45 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-1230:
------------------------------

    Attachment: context-objs-3.patch

Quick update to i) fix paths, ii) add abstract RecordReader with new methods as discussed
in HADOOP-3566.

> Replace parameters with context objects in Mapper, Reducer, Partitioner, InputFormat,
and OutputFormat classes
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1230
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1230
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>         Attachments: context-objs-2.patch, context-objs-3.patch, context-objs.patch
>
>
> This is a big change, but it will future-proof our API's. To maintain backwards compatibility,
I'd suggest that we move over to a new package name (org.apache.hadoop.mapreduce) and deprecate
the old interfaces and package. Basically, it will replace:
> package org.apache.hadoop.mapred;
> public interface Mapper extends JobConfigurable, Closeable {
>   void map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
throws IOException;
> }
> with:
> package org.apache.hadoop.mapreduce;
> public interface Mapper extends Closable {
>   void map(MapContext context) throws IOException;
> }
> where MapContext has the methods like getKey(), getValue(), collect(Key, Value), progress(),
etc.

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