[jira] Updated: (HADOOP-449) Generalize the SequenceFileInputFilter to apply to any InputFormat

["Enis Soztutar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Enis Soztutar updated HADOOP-449:
---------------------------------

    Affects Version/s:     (was: 0.17.0)
                       0.18.0
        Fix Version/s:     (was: 0.17.0)
                       0.18.0

We cannot make this into 0.17, moving to 0.18. 

> Generalize the SequenceFileInputFilter to apply to any InputFormat
> ------------------------------------------------------------------
>
>                 Key: HADOOP-449
>                 URL: https://issues.apache.org/jira/browse/HADOOP-449
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Owen O'Malley
>            Assignee: Enis Soztutar
>             Fix For: 0.18.0
>
>         Attachments: filtering_v2.patch, filtering_v3.patch, filterinputformat_v1.patch
>
>
> 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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