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From "Chris K Wensel (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3380) need comparators in serializer framework
Date Tue, 13 May 2008 19:17:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596505#action_12596505

Chris K Wensel commented on HADOOP-3380:

Ok, I think I get the gist of the new Serialization stuff. 

If I'm correct, I only would need RawComparator to be Configurable. And I can continue to
override the comparator via JobConf. I don't see that I would need to implement Serialization,
since Writable is suitable...

> 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
> 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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