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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3380) need comparators in serializer framework
Date Tue, 13 May 2008 17:51:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596470#action_12596470
] 

Doug Cutting commented on HADOOP-3380:
--------------------------------------

> So a configuration would be involved [...]

That was a little glib.  We need to make Serialization a Configurable, so that SerializationFactory
can pass the configuration down to the Serialization implementation, which can then use it
as it pleases.  I think we ought to do this too, as a part of this issue, in order to support
configurable comparators, etc.

> 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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