MapReduce生成HFile文件、加载HFile到HBase

MapReduce生成HFile文件、加载HFile到HBase

 

1、程序代码

public class TransformHFile  extends Configured implements Tool{
	
	public static final String COLUMN_FAMILY = "info";
	public static final String[] COLUMNS = new String[]{"rowkey","name","deptname","leader","joindate","sal","exp","deptno"};
	
	//7499    ALLEN   SALESMAN        7698    1981-2-20       1600.00 300.00  30
	static class TransFormMapper extends Mapper{
		
		ImmutableBytesWritable outkey = new ImmutableBytesWritable();

		@Override
		protected void map(LongWritable key, Text value,
				Mapper.Context context)
						throws IOException, InterruptedException {
			
			String line = value.toString();
			
			//TODO validate data
			// .... 
			
			String[] fields = new String[8];
				StringTokenizer token = new StringTokenizer(line);
			int i = 0;
			while (token.hasMoreTokens()){
				fields[i++] = token.nextToken();
			}
			
			outkey.set(Bytes.toBytes(fields[0]));
			Put put = new Put(Bytes.toBytes(fields[0]));
			
			for(int index=1;index<8 ;index++){
				if(StringUtils.isNotEmpty(fields[index]))
					put.add(Bytes.toBytes(COLUMN_FAMILY),Bytes.toBytes(COLUMNS[index]), Bytes.toBytes(fields[index]));
			}
			context.write(outkey,put);
		}
	}

	public int run(String[] args) throws Exception {
		
		Job job = Job.getInstance(this.getConf(), this.getClass().getSimpleName());
        job.setJarByClass(this.getClass());

        job.setMapperClass(TransFormMapper.class);
        
        job.setMapOutputKeyClass(ImmutableBytesWritable.class);
        job.setMapOutputValueClass(Put.class);
        
        FileInputFormat.addInputPath(job, new Path(args[1]));
        FileOutputFormat.setOutputPath(job,  new Path(args[2]));
        HFileOutputFormat2.configureIncrementalLoad(job, new HTable(getConf(),args[0]));
        
        int exitcode = job.waitForCompletion(true) ? 0 : 1;
		return exitcode;
	}
	
	public static void main(String[] args) throws Exception{

		/*args = new String[]{
				"emp2",
				"hdfs://hadoop-ehp.hyman.com:8020/user/ehp/hbase/importtsv/emp/input2",
				"hdfs://hadoop-ehp.hyman.com:8020/user/ehp/hbase/importtsv/emp/mapredHFile"
				};*/
		
		Configuration conf = HBaseConfiguration.create();
		
		int exitcode = ToolRunner.run(//
				conf, //
				new TransformHFile(), //
				args//
			);
        System.exit(exitcode);
	}
}

 2.打包运行

HADOOP_CLASSPATH=`${HBASE_HOME}/bin/hbase mapredcp`:${HBASE_HOME}/conf \
yarn jar $HADOOP_HOME/jars/mapred.jar \
com.hyman.ehp.mapred.hbase.TransformHFile \
emp \
/user/ehp/hbase/importtsv/emp/input \
/user/ehp/hbase/importtsv/emp/mapredHFile \

 3.加载HFile到HBase中

HADOOP_CLASSPATH=`${HBASE_HOME}/bin/hbase mapredcp`:${HBASE_HOME}/conf \
${HBASE_HOME}/bin/hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles \
/user/ehp/hbase/importtsv/emp/mapredHFile \
emp