HBase-修改表结构

HBase修改表结构

package com.hbase.HBaseAdmin;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.util.Bytes;

/**
* @author:FengZhen
* @create:2018年9月12日
* 修改表结构
*/
public class ModifyTable {

	private static String addr="HDP233,HDP232,HDP231";
	private static String port="2181";
	private static Connection connection;

	/**
	 * 获取连接
	 */
	public static void getConnection(){
		Configuration conf = HBaseConfiguration.create();

		conf.set("hbase.zookeeper.quorum",addr);
		conf.set("hbase.zookeeper.property.clientPort", port);
		try {
			connection = ConnectionFactory.createConnection(conf);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/*
	 * 关闭连接
	 */
	public static void close() {
		/**
		 * close connection
		 **/
		if (connection != null) {
			try {
				connection.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 *  Equals: true
		New schema: 'test_modify', {TABLE_ATTRIBUTES => {MAX_FILESIZE => '1073741824'}, {NAME => 'colfam1', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}, {NAME => 'colfam2', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}
	 */
	/**
	 * modifyTable方法只提供了异步的操作模式，没有提供同步的操作模式。
	 * 如果用户需要确认是否已经成功，需要在客户端代码中显式循环地调用getTableDescriptor方法获取元数据
	 * 直到结果与本地实例匹配。
	 * @param args
	 */
	public static void main(String[] args) {
		getConnection();
		try {
			String tableName = "test_modify";
			Admin admin = connection.getAdmin();
			HTableDescriptor tableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
			HColumnDescriptor columnDescriptor = new HColumnDescriptor(Bytes.toBytes("colfam1"));
			tableDescriptor.addFamily(columnDescriptor);
			//使用旧结构建表
			admin.createTable(tableDescriptor);

			HTableDescriptor tableDescriptor2 = admin.getTableDescriptor(TableName.valueOf(tableName));
			HColumnDescriptor columnDescriptor2 = new HColumnDescriptor(Bytes.toBytes("colfam2"));
			tableDescriptor2.addFamily(columnDescriptor2);
			tableDescriptor2.setMaxFileSize(1024 * 1024 * 1024L);

			admin.disableTable(TableName.valueOf(tableName));
			admin.modifyTable(TableName.valueOf(tableName), tableDescriptor2);
			admin.enableTable(TableName.valueOf(tableName));

			HTableDescriptor tableDescriptor3 = admin.getTableDescriptor(TableName.valueOf(tableName));
			System.out.println("Equals: " + tableDescriptor2.equals(tableDescriptor3));
			System.out.println("New schema: " + tableDescriptor3);
		} catch (IOException e) {
			e.printStackTrace();
		}
		close();
	}

}