MapReduce-从HBase读取数据处理后再写入HBase

MapReduce-从HBase读取处理后再写入HBase

代码如下

package com.hbase.mapreduce;

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.KeyValue;
import org.apache.hadoop.hbase.client.Mutation;
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.TableInputFormat;
import org.apache.hadoop.hbase.mapreduce.TableMapper;
import org.apache.hadoop.hbase.mapreduce.TableOutputFormat;
import org.apache.hadoop.hbase.mapreduce.TableReducer;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

/**
* @author:FengZhen
* @create:2018年9月17日
* 从HBase读写入HBase
* zip -d HBaseToHBase.jar 'META-INF/.SF' 'META-INF/.RSA' 'META-INF/*SF'
*/
public class HBaseToHBase extends Configured implements Tool{

	private static String addr="HDP233,HDP232,HDP231";
	private static String port="2181";
	
	public enum Counters { ROWS, COLS, VALID, ERROR, EMPTY, NOT_EMPTY}
	
	static class ParseMapper extends TableMapper<ImmutableBytesWritable, Put>{
		private byte[] columnFamily = null;
		@Override
		protected void setup(Mapper<ImmutableBytesWritable, Result, ImmutableBytesWritable, Put>.Context context)
				throws IOException, InterruptedException {
			columnFamily = Bytes.toBytes(context.getConfiguration().get("conf.columnfamily"));
		}
		@Override
		protected void map(ImmutableBytesWritable key, Result value,
				Mapper<ImmutableBytesWritable, Result, ImmutableBytesWritable, Put>.Context context)
				throws IOException, InterruptedException {
			context.getCounter(Counters.ROWS).increment(1);
			String hbaseValue = null;
			
			Put put = new Put(key.get());
			for (Cell cell : value.listCells()) {
				context.getCounter(Counters.COLS).increment(1);
				hbaseValue = Bytes.toString(CellUtil.cloneValue(cell));
				if (hbaseValue.length() > 0) {
					String top = hbaseValue.substring(0, hbaseValue.length()/2);
					String detail = hbaseValue.substring(hbaseValue.length()/2, hbaseValue.length() - 1);
					put.addColumn(columnFamily, Bytes.toBytes("top"), Bytes.toBytes(top));
					put.addColumn(columnFamily, Bytes.toBytes("detail"), Bytes.toBytes(detail));
					context.getCounter(Counters.NOT_EMPTY).increment(1);
				}else {
					put.addColumn(columnFamily, Bytes.toBytes("empty"), Bytes.toBytes(hbaseValue));
					context.getCounter(Counters.EMPTY).increment(1);
				}
			}
			try {
				context.write(key, put);
				context.getCounter(Counters.VALID).increment(1);
			} catch (Exception e) {
				e.printStackTrace();
				context.getCounter(Counters.ERROR).increment(1);
			}
		}
	}
	
	static class ParseTableReducer extends TableReducer<ImmutableBytesWritable, Put, ImmutableBytesWritable>{
		@Override
		protected void reduce(ImmutableBytesWritable key, Iterable<Put> values,
				Reducer<ImmutableBytesWritable, Put, ImmutableBytesWritable, Mutation>.Context context)
				throws IOException, InterruptedException {
			for (Put put : values) {
				context.write(key, put);
			}
		}
	}
	
	public int run(String[] arg0) throws Exception {
		String table = arg0[0];
		String column = arg0[1];
		String destTable = arg0[2];
		
		Configuration configuration = HBaseConfiguration.create();
		configuration.set("hbase.zookeeper.quorum",addr);
		configuration.set("hbase.zookeeper.property.clientPort", port);
		
		Scan scan = new Scan();
		if (null != column) {
			byte[][] colkey = KeyValue.parseColumn(Bytes.toBytes(column));
			if (colkey.length > 1) {
				scan.addColumn(colkey[0], colkey[1]);
				configuration.set("conf.columnfamily", Bytes.toString(colkey[0]));
				configuration.set("conf.columnqualifier", Bytes.toString(colkey[1]));
			}else {
				scan.addFamily(colkey[0]);
				configuration.set("conf.columnfamily", Bytes.toString(colkey[0]));
			}
		}
		
		Job job = Job.getInstance(configuration);
		job.setJobName("HBaseToHBase2");
		job.setJarByClass(HBaseToHBase2.class);
		
		job.getConfiguration().set(TableInputFormat.INPUT_TABLE, table);
		job.getConfiguration().set(TableOutputFormat.OUTPUT_TABLE, destTable);
		
		job.setMapperClass(ParseMapper.class);
		job.setMapOutputKeyClass(ImmutableBytesWritable.class);
		job.setMapOutputValueClass(Put.class);
		
//		job.setReducerClass(ParseTableReducer.class);
		job.setOutputKeyClass(ImmutableBytesWritable.class);
		job.setOutputValueClass(Put.class);
		
		job.setInputFormatClass(TableInputFormat.class);
		TableInputFormat.addColumns(scan, KeyValue.parseColumn(Bytes.toBytes(column)));
		job.setOutputFormatClass(TableOutputFormat.class);
		
		job.setNumReduceTasks(0);
		
		//使用TableMapReduceUtil会报类找不到错误
		//Caused by: java.lang.ClassNotFoundException: com.yammer.metrics.core.MetricsRegistry
//		TableMapReduceUtil.initTableMapperJob(table, scan, ParseMapper.class, ImmutableBytesWritable.class, Put.class, job);
//		TableMapReduceUtil.initTableReducerJob(table, IdentityTableReducer.class, job);
		
		return job.waitForCompletion(true) ? 0 : 1;
	}
	public static void main(String[] args) throws Exception {
		String[] params = new String[] {"test_table_mr", "data:info", "test_table_dest"};
		int exitCode = ToolRunner.run(new HBaseToHBase2(), params);
		System.exit(exitCode);
	}
}

　打包测试

zip -d HBaseToHBase.jar 'META-INF/.SF' 'META-INF/.RSA' 'META-INF/*SF'
hadoop jar HBaseToHBase.jar com.hbase.mapreduce.HBaseToHBase

出现的问题

一开始使用额TableMapReduceUtil,但是报下面这个错

Exception in thread "main" java.lang.NoClassDefFoundError: com/yammer/metrics/core/MetricsRegistry
	at org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.addHBaseDependencyJars(TableMapReduceUtil.java:732)
	at org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.addDependencyJars(TableMapReduceUtil.java:777)
	at org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob(TableMapReduceUtil.java:212)
	at org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob(TableMapReduceUtil.java:168)
	at org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob(TableMapReduceUtil.java:291)
	at org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob(TableMapReduceUtil.java:92)
	at com.hbase.mapreduce.HBaseToHBase.run(HBaseToHBase.java:108)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
	at com.hbase.mapreduce.HBaseToHBase.main(HBaseToHBase.java:115)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.util.RunJar.run(RunJar.java:233)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:148)
Caused by: java.lang.ClassNotFoundException: com.yammer.metrics.core.MetricsRegistry
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 16 more

　解决，不使用TableMapReduceUtil，分布设置便可解决此问题