mr任务之从多个Hbase表中读取数据进行处理

从两个不同的Hbase表中读取数据：

在reduce中根据数据结构 判断数据是来源于那个Hbase表即可

// 设置查询条件
		List scans = new ArrayList();
		Scan scan1 = new Scan();
		scan1.setCaching(100);
		scan1.setCacheBlocks(false);
		scan1.setAttribute(Scan.SCAN_ATTRIBUTES_TABLE_NAME, inTable.getBytes());
		scans.add(scan1);
		
		Scan scan2 = new Scan();
		scan2.setCaching(100);
		scan2.setCacheBlocks(false);
		scan2.setAttribute(Scan.SCAN_ATTRIBUTES_TABLE_NAME, inPhoneImsiTable.getBytes());
		scans.add(scan2);
		
		try {
			Job job=new Job(conf);
			job.setJobName("HistoryDataPhonetoImsiTasker");
			job.setInputFormatClass(MultiTableInputFormat.class);
			TableMapReduceUtil.initTableMapperJob(scans, ReadHbaseMapper.class, Text.class,Result.class, job);
			TableMapReduceUtil.initTableReducerJob(outTable, WritetoHbaseReducer.class, job);
			TableMapReduceUtil.addDependencyJars(job.getConfiguration(), SortKey.class);

			job.setJarByClass(HistoryDataPhonetoImsiCategoryTasker.class);
			job.setMapOutputKeyClass(SortKey.class);
			job.setMapOutputValueClass(CustomOutWritable.class);
			
			job.setSortComparatorClass(SecondSortCompartor.class);
			job.setGroupingComparatorClass(SecondSortGroupCompartor.class);
			job.setPartitionerClass(SecondSortPartitioner.class);
			
			job.waitForCompletion(true);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}