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http://issues.apache.org/jira/browse/HADOOP-449?page=comments#action_12427572 ]
Owen O'Malley commented on HADOOP-449:
--------------------------------------
Oops, I should use the structure of SequencFileInputFilter and do:
public class FilterInputFormat implements InputFormat {
public static interface Filter {
boolean accept(Writable key);
}
...
}
> Generalize the SequenceFileInputFilter to apply to any InputFormat
> ------------------------------------------------------------------
>
> Key: HADOOP-449
> URL: http://issues.apache.org/jira/browse/HADOOP-449
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.5.0
> Reporter: Owen O'Malley
> Assigned To: Owen O'Malley
> Fix For: 0.6.0
>
>
> I'd like to generalize the SequenceFileInputFormat that was introduced in
> HADOOP-412 so that it can be applied to any InputFormat. To do this, I
> propose:
> interface WritableFilter {
> boolean accept(Writable item);
> }
> class FilterInputFormat implements InputFormat {
> ...
> }
> FilterInputFormat would look in the JobConf for:
> mapred.input.filter.source = the underlying input format
> mapred.input.filter.filters = a list of class names that implement
> WritableFilter
> The FilterInputFormat will work like the current SequenceFilter, but use an
> internal RecordReader rather than the SequenceFile. This will require adding
> a next(key) and getCurrentValue(value) to the RecordReader interface, but
> that will be addressed in a different issue.
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