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From "Radim Kolar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8619) WritableComparator must implement no-arg constructor
Date Sun, 29 Jul 2012 11:22:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424523#comment-13424523
] 

Radim Kolar commented on HADOOP-8619:
-------------------------------------

Hadoop serialization framework aka Writable is not only possible way for serializing object.
We use Thrift on top on Hadoop Writables. 

Without serializable comparator its not possible to have serializable collections with ordering.
                
> WritableComparator must implement no-arg constructor
> ----------------------------------------------------
>
>                 Key: HADOOP-8619
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8619
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 3.0.0
>            Reporter: Radim Kolar
>             Fix For: 0.23.0, 2.0.0-alpha, 3.0.0
>
>         Attachments: writable-comparator.txt
>
>
> Because of reasons listed here: http://findbugs.sourceforge.net/bugDescriptions.html#SE_COMPARATOR_SHOULD_BE_SERIALIZABLE
> comparators should be serializable. To make deserialization work, it is required that
all superclasses have no-arg constructor. http://findbugs.sourceforge.net/bugDescriptions.html#SE_NO_SUITABLE_CONSTRUCTOR
> Simply add no=arg constructor to  WritableComparator.

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