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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8074) Consolidate map-side features across mapreduce tools into a single place
Date Tue, 12 Mar 2013 01:07:12 GMT
Nick Dimiduk created HBASE-8074:
-----------------------------------

             Summary: Consolidate map-side features across mapreduce tools into a single place
                 Key: HBASE-8074
                 URL: https://issues.apache.org/jira/browse/HBASE-8074
             Project: HBase
          Issue Type: Improvement
          Components: mapreduce, Usability
            Reporter: Nick Dimiduk


The mapreduce tools support a similar but divergent set of features for mapping over KeyValue
data:
 * {{Export}} supports specifying a version-range window, application of a rowkey regex or
prefix filter, and a "raw mode" that includes delete markers.
 * {{Import}} can apply an arbitrary filter and can also apply a "transform", renaming column
families in the emitted KeyValues.
 * {{CopyTable}} allows specifying a version-range window, limiting to a fixed number of versions,
a "raw mode", and column family transformation.
 * {{WALPlayer}} supports reading a time-range.
 * {{ImportTsv}} could incorporate a number of these features, especially the filter and transform
capabilities, allowing a user to avoid implementing a custom mapper where the existing parser
is sufficient, but for a slight massage of the data.

The proposal is to create a single implementation for these features with a single configuration
interface. Ideally, such an implementation would be exposed via the common utility classes
as well (ie, IdentityTableMapper).

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