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Posted to common-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2007/01/02 22:14:27 UTC
[jira] Commented: (HADOOP-525) Need raw comparators for hadoop
record types
[ http://issues.apache.org/jira/browse/HADOOP-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12461824 ]
Owen O'Malley commented on HADOOP-525:
--------------------------------------
Why are the generated files being checked into svn? It would be a much better test if they were generated, wouldn't it?
> 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
> Fix For: 0.10.0
>
> Attachments: raw-comparators.patch, TypeBuilder-support.tar, TypeBuilder.java, WordCountType.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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