Although the framework currently allows one HBase table as input to a MapReduce job, other HBase tables can be accessed as lookup tables, etc., in a MapReduce job via creating an HTable instance in the setup method of the Mapper.
public class MyMapper extends TableMapper<Text, LongWritable> { private HTable myOtherTable; @Override public void setup(Context context) { myOtherTable = new HTable("myOtherTable"); }