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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3566) Create an InputFormat for reading lines of text as Java Strings
Date Wed, 25 Jun 2008 21:52:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608212#action_12608212
] 

Owen O'Malley commented on HADOOP-3566:
---------------------------------------

Could we use

{code}
   K getKey() throws IOException;
   V getValue() throws IOException;
{code}

We should probably change the context objects for InputFormats this way too.

The whole Long,String signature for TextInputFormat has always kind of annoyed me. No one
ever uses those offsets and they mean that TextInputFormat, IdentityMapper, IdentityReducer,
TextOutputFormat doesn't do the "sort" that people expect.



> Create an InputFormat for reading lines of text as Java Strings
> ---------------------------------------------------------------
>
>                 Key: HADOOP-3566
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3566
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Tom White
>            Assignee: Tom White
>         Attachments: hadoop-3566.patch
>
>
> Such a StringInputFormat would be like TextInputFormat but with input types of Long and
String, rather than LongWritable and Text. This would allow users to write MapReduce programs
that used only Java native types (i.e. no Writables).
> This is currently not possible to write without changes to Hadoop due to a limitation
in the RecordReader interface explained here: https://issues.apache.org/jira/browse/HADOOP-3413?focusedCommentId=12597935#action_12597935

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