Nick Dimiduk created HBASE-8074:
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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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