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