//Create ArrayList
List table = new ArrayList();

//Store the first input table
Scan table1 = new Scan();
table1.setAttribute("scan.attributes.table.name", Bytes.toBytes("tablename1"));
table.add(table1);

//Store the second input table
Scan table2= new Scan();
table2.setAttribute("scan.attributes.table.name", Bytes.toBytes("tablename2"));
table.add(table2);

//Access mutiple input tables
TableMapReduceUtil.initTableMapperJob(table, mapper.class, mapper.class, job); //input tables
TableMapReduceUtil.initTableReducerJob( "outputtable", reducer.class, job); //output tables