hbase学习笔记-----REST客户端
1. 启动REST服务
a.启动一个非守护进程模式的REST服务器(ctrl+c 终止)
bin/hbase rest start
b.启动守护进程模式的REST服务器
bin/hbase-daemon.sh start rest
默认启动的是8080端口(可以使用参数在启动时指定端口)，可以被访问。eg. curl http://<servername>:8080/
2.访问服务端的数据
3.使用Java API访问
1 package rest; 2 3 import org.apache.hadoop.conf.Configuration; 4 import org.apache.hadoop.hbase.HBaseConfiguration; 5 import org.apache.hadoop.hbase.client.Get; 6 import org.apache.hadoop.hbase.client.Result; 7 import org.apache.hadoop.hbase.client.ResultScanner; 8 import org.apache.hadoop.hbase.client.Scan; 9 import org.apache.hadoop.hbase.rest.client.Client; 10 import org.apache.hadoop.hbase.rest.client.Cluster; 11 import org.apache.hadoop.hbase.rest.client.RemoteHTable; 12 import org.apache.hadoop.hbase.util.Bytes; 13 import util.HBaseHelper; 14 15 import java.io.IOException; 16 17 /** 18 * Created by root on 15-1-9. 19 */ 20 public class RestExample { 21 public static void main(String[] args) throws IOException { 22 Configuration conf = HBaseConfiguration.create(); 23 24 HBaseHelper helper = HBaseHelper.getHelper(conf); 25 helper.dropTable("testtable"); 26 helper.createTable("testtable", "colfam1"); 27 System.out.println("Adding rows to table..."); 28 helper.fillTable("testtable", 1, 10, 5, "colfam1"); 29 30 Cluster cluster=new Cluster(); 31 cluster.add("hadoop",8080); 32 33 Client client=new Client(cluster); 34 35 RemoteHTable table=new RemoteHTable(client,"testtable"); 36 37 Get get = new Get(Bytes.toBytes("row-30")); 38 get.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("col-3")); 39 Result result1 = table.get(get); 40 41 System.out.println("Get result1: " + result1); 42 43 Scan scan = new Scan(); 44 scan.setStartRow(Bytes.toBytes("row-10")); 45 scan.setStopRow(Bytes.toBytes("row-15")); 46 scan.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("col-5")); 47 ResultScanner scanner = table.getScanner(scan); 48 for (Result result2 : scanner) { 49 System.out.println("Scan row[" + Bytes.toString(result2.getRow()) + 50 "]: " + result2); 51 } 52 53 } 54 55 }
