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https://issues.apache.org/jira/browse/MAPREDUCE-1126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830222#action_12830222
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Doug Cutting commented on MAPREDUCE-1126:
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> Doug, neither this or my previous patch use any deprecated APIs.
They use a method (SerializationBase.getMetadataFromClass) that's not intended
as a primary, serialization-independent means for the framework to create a
serialization. That's a utility intended to be shared by serialization systems
that use a class to create their metadata. The only other calls to it are from
deprecated, back-compatibility methods and contexts where serialization is
class-based. It *should* have been deprecated. New framework code should not
use this method as a primary means to create a serialization, as it does not
support all serializations.
> shuffle should use serialization to get comparator
> --------------------------------------------------
>
> Key: MAPREDUCE-1126
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1126
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task
> Reporter: Doug Cutting
> Assignee: Aaron Kimball
> Fix For: 0.22.0
>
> Attachments: m-1126-2.patch, m-1126-3.patch, MAPREDUCE-1126.2.patch,
> MAPREDUCE-1126.3.patch, MAPREDUCE-1126.4.patch, MAPREDUCE-1126.5.patch,
> MAPREDUCE-1126.6.patch, MAPREDUCE-1126.patch, MAPREDUCE-1126.patch
>
>
> Currently the key comparator is defined as a Java class. Instead we should
> use the Serialization API to create key comparators. This would permit,
> e.g., Avro-based comparators to be used, permitting efficient sorting of
> complex data types without having to write a RawComparator in Java.
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