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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1126) shuffle should use serialization to get comparator
Date Wed, 16 Dec 2009 02:10:18 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Aaron Kimball updated MAPREDUCE-1126:

    Attachment: MAPREDUCE-1126.2.patch

Attaching a new patch for this issue that incorporates the API changes initially proposed
as HADOOP-6438.

This adds a package {{org.apache.hadoop.mapreduce.lib.jobdata}} which contains static classes
to set class-based or schema-based metadata. Explicit subclasses exist for particular serialization
frameworks (e.g., WritableSerialization) to allow users to denote which framework they are
using; in general their behavior is the same as their superclasses.

This keeps the mapreduce-specific job configuration data in the MapReduce project, but does
not clutter JobContext with per-serialization-framework setters for clients to use. 

> 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
>         Attachments: MAPREDUCE-1126.2.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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