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https://issues.apache.org/jira/browse/MAPREDUCE-1126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830191#action_12830191
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Doug Cutting commented on MAPREDUCE-1126:
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Owen, your patch uses a deprecated means to create a serialization that does
not work for all serializations. As such, it is not a complete patch for this
issue. The intended way to use the serialization API is for the application to
use Map<String,String> metadata. This was established by HADOOP-6165 and was
the rationale for HADOOP-6420. The method
SerializationBase.getMetadataFromClass should not be called by the framework,
but is a utility for class-based serialization implementations.
> 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, 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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