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From "Stuart Sierra (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3944) TupleWritable listed as public class but cannot be used without methods private to the package
Date Wed, 13 Aug 2008 17:26:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622286#action_12622286
] 

Stuart Sierra commented on HADOOP-3944:
---------------------------------------

The visibility of TupleWritable in the javadocs is confusing to new users (like me), who may
be tempted to use it as a general-purpose container object in MapReduce jobs, which doesn't
work.

> TupleWritable listed as public class but cannot be used without methods private to the
package
> ----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3944
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3944
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 0.17.1
>            Reporter: Michael Andrews
>            Priority: Minor
>
> Reading the hadoop-core javadocs, it appears as though TupleWritable can be used outside
of the
> org.apache.hadoop.mapred.join.* package.  A user can import TupleWritable but cannot
use it correctly without the setWritten, and clearWritten methods being public.   It seems
as the though the intent was to make TupleWritable hidden from the user as it is dependent
on CompositeRecordReader.  As a possible solution, classes within a package can be made invisible
to the user by omitting 'public' from the class definition.  In the case of TupleWritable,
this removes the javadoc link from other classes in mapred.join and it's not clear if these
classes should be hidden from the user.

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