Hbase几种数据入库（load）方式比较

1. 预先生成HFile入库

这个地址有详细的说明http://blog.youkuaiyun.com/dajuezhao/archive/2011/04/26/6365053.aspx

2. 通过MapReduce入库

/* MapReduce 读取hdfs上的文件，以HTable.put(put)的方式在map中完成数据写入，无reduce过程*/

import java.io.IOException;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.conf.Configured;

import org.apache.hadoop.hbase.HBaseConfiguration;

import org.apache.hadoop.hbase.client.HTable;

import org.apache.hadoop.hbase.client.Put;

import org.apache.hadoop.hbase.util.Bytes;

import org.apache.hadoop.io.LongWritable;

import org.apache.hadoop.io.NullWritable;

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.TextInputFormat;

import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;

import org.apache.hadoop.util.GenericOptionsParser;

import org.apache.hadoop.util.Tool;

import org.apache.hadoop.util.ToolRunner;

public class HBaseImport extends Configured implements Tool{

static final Log LOG = LogFactory.getLog(HBaseImport.class);

public static final String JOBNAME = "MRImport ";

public static class Map extends Mapper<LongWritable , Text, NullWritable, NullWritable>{

<