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From "Yanbo Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8619) WritableComparator must implement no-arg constructor
Date Mon, 30 Jul 2012 08:54:36 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424763#comment-13424763
] 

Yanbo Liang commented on HADOOP-8619:
-------------------------------------

@Radim Kolar
There are different ways to serialize data include Writable, Thrift and Protocol Buffer. But
I don't think it's necessary to serialize and transport comparator through the wire. Because
in both sides of the communication, they should have the same code which include the comparator
code. I think the comparator is part of the code rather than the data.
                
> 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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