Hbase 2.0 RegionObserver使用

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参考：http://hbase.apache.org/2.0/book.html#cp

   Hbase2.0 不支持 1.x版本的RegionObserver  ，查看hbase官网更新说明，自己做了测试并通过

• Hbase RegionObserver 

import java.io.IOException;
import java.util.List;
import java.util.Optional;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Durability;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.coprocessor.RegionObserver;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.wal.WALEdit;
import org.apache.yetus.audience.InterfaceAudience;

import com.izhonghong.util.Md5Utils;

//注：2.0版本之前使用extends BaseRegionObserver 实现，
public class ObserverTest implements   RegionObserver,RegionCoprocessor  {
	private static final Log LOG = LogFactory.getLog(ObserverTest.class);
	static Connection  connection = null;  
	static Table table = null;
	static{
		Configuration conf = HBaseConfiguration.create(); 
		conf.set("hbase.zookeeper.quorum",
				"test:2181");
		try {
			connection = ConnectionFactory.createConnection(conf);  
			table = connection.getTable(TableName.valueOf("tableName"));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}


	private RegionCoprocessorEnvironment env = null;

	private static final String FAMAILLY_NAME = "fn";
	private static final String UID = "uid";
	private static final String BIZ = "biz";


//2.0加入该方法，否则无法生效
	@Override
	public Optional<RegionObserver> getRegionObserver() {
		// Extremely important to be sure that the coprocessor is invoked as a RegionObserver
		return Optional.of(this);
	}

	@Override
	public void start(CoprocessorEnvironment e) throws IOException {
		env = (RegionCoprocessorEnvironment) e;
	}


	@Override
	public void stop(CoprocessorEnvironment e) throws IOException {
		// nothing to do here
	}
	
	
	@Override
	public void prePut(final ObserverContext<RegionCoprocessorEnvironment> e,
			final Put put, final WALEdit edit, final Durability durability)
					throws IOException {
		try {
			List<Cell> list = put.get(Bytes.toBytes(FAMAILLY_NAME),
					Bytes.toBytes(UID));
			if (list == null || list.size() == 0) {
				return;
			}
			Cell cell2 = list.get(0);
			String uid = Bytes.toString(CellUtil.cloneValue(cell2));
			Put put2 = new Put(Bytes.toBytes(Md5Utils.getMd5ByStr(uid)));
			put2.addColumn(Bytes.toBytes(FAMAILLY_NAME), Bytes.toBytes(BIZ),  Bytes.toBytes(uid));
			put2.setTTL(1000l * 60 * 60 *24 *30);
			table.put(put2);
			table.close();
		} catch (Exception e1) {
			LOG.error("异常------->>>>>> "+e1.getMessage());
			return ;
		}
	}


}

•  协处理器安装-表级别安装

disable 'tableName'
alter 'tableName' , METHOD =>'table_att','coprocessor'=>'/hbase/coprocessor/hbase-coprocessor-1.0.0.jar|com.xxx.hbase.coprocessor.xxx|1001'
enable 'tableName'

• 协处理器卸载

disable 'tableName'
alter 'tableName', METHOD => 'table_att_unset', NAME => 'coprocessor$1'
enable 'tableName'