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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 17:09:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596453#action_12596453
] 

Chris K Wensel commented on HADOOP-3380:
----------------------------------------

Would be useful for the RawComparator to be Configurable (or something similar) so that it
can be configured during runtime.

This would be very useful for multi-part keys that need to arbitrarily sort on different positions.

> 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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