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From "Trevor Strohman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-525) Need raw comparators for hadoop record types
Date Wed, 11 Oct 2006 20:16:36 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-525?page=all ]

Trevor Strohman updated HADOOP-525:
-----------------------------------

    Attachment: TypeBuilder.java

TypeBuilder class used in another MapReduce implementation.

> Need raw comparators for hadoop record types
> --------------------------------------------
>
>                 Key: HADOOP-525
>                 URL: http://issues.apache.org/jira/browse/HADOOP-525
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: record
>    Affects Versions: 0.6.0
>            Reporter: Sameer Paranjpye
>         Assigned To: Milind Bhandarkar
>            Priority: Minor
>             Fix For: 0.8.0
>
>         Attachments: TypeBuilder.java
>
>
> Raw comparators are not generated for types that are generated with the Hadoop record
framework. This could have a substantial performance impact when using hadoop record generated
types in Map/Reduce. The record i/o framework should auto-generate raw comparators for types.
> Comparison for hadoop record i/o types is defined to be member wise comparison of objects.
A possible implementation could only deserialize one member from each object at a time, compare
them and either return or move on to the next member if the values are equal.

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