使用MapReduce将HDFS数据导入到HBase（一）

package com.bank.service;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

/**
 * 使用MapReduce批量导入Hbase（没有Reduce函数的MapReduce）
 * @author mengyao
 *
 */
public class DataImportToHbase extends Configured implements Tool {

static class DataImportToHbaseMapper extends Mapper<LongWritable, Text, ImmutableBytesWritable, Put> {
        private static String familyName = "info";
        private static String[] qualifiers = {"gzh", "currency", "version", "valuta", "qfTime", "flag", "machineID"};
        @Override
        protected void map(LongWritable key, Text value, Context context)
                throws IOException, InterruptedException {
            String line = value.toString();
            String[] values = line.split("\t");
            if (values.length == 7 && values.length == qualifiers.length) {
                String row = values[0]+"_"+values[1]+"_"+values[2]+"_"+values[3];
                long timestamp = System.currentTimeMillis();
                ImmutableBytesWritable immutable = new ImmutableBytesWritable(Bytes.toBytes(row));
                Put put = new Put(Bytes.toBytes(row));
                for (int i = 0; i < values.length; i++) {
                    String qualifier = qualifiers[i];
                    String val = values[i];
                    put.add(Bytes.toBytes(familyName), Bytes.toBytes(qualifier), timestamp, Bytes.toBytes(val));
                }
                context.write(immutable, put);
            } else {
                System.err.println(" ERROR: value length must equale qualifier length ");
            }
        }
    }

@Override
    public int run(String[] arg0) throws Exception {
        Job job = Job.getInstance(getConf(), DataImportToHbase.class.getSimpleName());
        job.setJarByClass(DataImportToHbase.class);
        
        job.setInputFormatClass(TextInputFormat.class);
        FileInputFormat.setInputPaths(job, new Path(arg0[0]));
        
        job.setMapperClass(DataImportToHbaseMapper.class);
        job.setMapOutputKeyClass(ImmutableBytesWritable.class);
        job.setMapOutputValueClass(Put.class);
        
        TableMapReduceUtil.initTableReducerJob(arg0[1], null, job);        
        job.setNumReduceTasks(0);
        TableMapReduceUtil.addDependencyJars(job);
        
        return job.waitForCompletion(true) ? 0 : 1;
    }
    
    public static void main(String[] args) throws Exception {
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "h5:2181,h6:2181,h7:2181");
        conf.set("hbase.zookeeper.property.clientPort", "2181");
        conf.set("dfs.socket.timeout", "3600000");
        String[] otherArgs = new GenericOptionsParser(args).getRemainingArgs();
        if (otherArgs.length != 2) {
            System.err.println(" ERROR: <dataInputDir> <tableName>");
            System.exit(2);
        }
        int status = ToolRunner.run(conf, new DataImportToHbase(), otherArgs);
        System.exit(status);
    }
}