从hbase表1中读取数据，最终结果写入到hbase表2 ，如何通过MapReduce实现 ？

需要一：
将hbase中‘student’表中的info：name和info：age两列数据取出并写入到hbase中‘user’表中的basic：XM和basic：NL

class ReadStudentMapper extends TableMapper

package hbaseapi.hbase;import java.io.IOException;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.conf.Configured;import org.apache.hadoop.hbase.Cell;import org.apache.hadoop.hbase.CellUtil;import org.apache.hadoop.hbase.HBaseConfiguration;import org.apache.hadoop.hbase.client.Put;import org.apache.hadoop.hbase.client.Result;import org.apache.hadoop.hbase.client.Scan;import org.apache.hadoop.hbase.io.ImmutableBytesWritable;import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;import org.apache.hadoop.hbase.mapreduce.TableMapper;import org.apache.hadoop.hbase.mapreduce.TableReducer;import org.apache.hadoop.hbase.util.Bytes;import org.apache.hadoop.io.NullWritable;import org.apache.hadoop.mapreduce.Job;import org.apache.hadoop.mapreduce.Mapper.Context;import org.apache.hadoop.util.Tool;import org.apache.hadoop.util.ToolRunner;public class Student2UserMapReduce extends Configured implements Tool {    // Step 1 : Mapper    public static class ReadStudentMapper extends            TableMapper<ImmutableBytesWritable, Put> {        @Override        protected void map(ImmutableBytesWritable key, Result value,                Context context) throws IOException, InterruptedException {            // create put ,            Put put = new Put(key.get());            // add cell/data to put            for (Cell cell : value.rawCells()) {                // get info family                if ("info".equals(Bytes.toString(CellUtil.cloneFamily(cell)))) {                    // add name to put                    if ("name".equals(Bytes.toString(CellUtil                            .cloneQualifier(cell)))) {                        put.add(Bytes.toBytes("info"), Bytes.toBytes("XM"),                                CellUtil.cloneValue(cell));                    } else if ("age".equals(Bytes.toString(CellUtil                            .cloneQualifier(cell)))) {                        put.add(Bytes.toBytes("info"), Bytes.toBytes("NL"),                                CellUtil.cloneValue(cell));                    }                }            }            // context output            context.write(key, put);        }    }    // Step 2 : Reducer    public static class WriteUserReducer extends            TableReducer<ImmutableBytesWritable, Put, NullWritable> {        @Override        protected void reduce(ImmutableBytesWritable key, Iterable<Put> values,                Context context) throws IOException, InterruptedException {            for (Put put : values) {                context.write(NullWritable.get(), put);            }        }    }    // Step 3 : Driver    public int run(String[] args) throws Exception {        // 1) Configuration        Configuration conf = this.getConf();        // 2) create job        Job job = Job.getInstance(conf, this.getClass().getSimpleName());        job.setJarByClass(Student2UserMapReduce.class);        // 3) set job        // set scan 设置一个查询范围或条件        Scan scan = new Scan();        // 设置只扫描某些列或列簇        scan.addFamily(Bytes.toBytes("info"));        // set Mapper        TableMapReduceUtil.initTableMapperJob("student",                 scan,                 ReadStudentMapper.class,                ImmutableBytesWritable.class,                 Put.class,                 job);        // set Reducer         TableMapReduceUtil.initTableReducerJob(                "user",                WriteUserReducer.class,                 job);        //set reduce nums         job.setNumReduceTasks(1); //at least one ,adjust as required!!        boolean isSuccess = job.waitForCompletion(true);        if (!isSuccess) {            throw new IOException("error with job!");        }        return isSuccess ? 0 : 1;    }    public static void main(String[] args) throws Exception {        Configuration conf = HBaseConfiguration.create();        int status = ToolRunner.run(//                conf, //                new Student2UserMapReduce(), //                args //                );        System.exit(status);    }}