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https://issues.apache.org/jira/browse/HADOOP-3380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12598348#action_12598348
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Doug Cutting commented on HADOOP-3380:
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> Note that getComparator() takes the class as an argument [ ... ]
That makes sense, but I had assumed that the Serialization could keep a pointer
to the class and then use that in its implementation of getComparator() to look
up a registered comparator. Applications would not need to pass a class to
Serialization#getComparator(), since Serializeation is already parameterized by
class.
> need comparators in serializer framework
> ----------------------------------------
>
> Key: HADOOP-3380
> URL: https://issues.apache.org/jira/browse/HADOOP-3380
> Project: Hadoop Core
> Issue Type: New Feature
> Components: io
> Reporter: Doug Cutting
> Attachments: comparator_wip1.patch, comparator_wip1.patch
>
>
> The new serialization framework permits Hadoop to incorporate different
> serialization systems, including Hadoop's Writable, Thrift, Java
> Serialization, etc. It provides a generic, extensible means
> (SerializationFactory) to create serializers and deserializers for arbitrary
> Java classes. However it does not include a generic means to create
> comparators for these classes. Comparators are required for MapReduce keys
> and many other computations. Thus we should enhance the serialization
> framwork to provide comparators too.
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