Hbase的安装与测试

实验环境

虚拟机伪分布式

Ubuntu 17.10

JDK 1.8

Hadoop 2.7.6

Hbase 1.3.3

①安装和配置HBase。

首先从官网http://archive.apache.org/dist/hbase/下载HBase安装包，为了兼容性，这里选择HBase-1.3.3。然后解压到文件夹。

②配置环境变量

将hbase下的bin目录添加到path中

编辑~/.bashrc文件添加 export PATH=$PATH:bin路径

③伪分布式模式配置

配置hbase/conf/hbase-env.sh

配置hbase/conf/hbase-site.xml

假设当前Hadoop集群运行在伪分布式模式下，在本机上运行，且NameNode运行在9000端口。

④启动Hadoop

启动Hbase

⑤根据表格，用Hbase Shell命令模式设计student学生表格。

⑥查询zhangsan 的Computer成绩。

⑦修改lisi的Math成绩，改为95。

⑧根据上面的student表，用Hbase Java API编程

新建一个工程，将hbase/lib中的所有jar包添加到项目

a)    添加数据：English:45 Math:89  Computer:100

 import java.io.IOException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 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.client.Put;
 import org.apache.hadoop.hbase.client.Table;

 public class Hbase {
     public static Configuration configuration;
     public static Connection connection;
     public static Admin admin;

     public static void main(String[] args) {
         configuration = HBaseConfiguration.create();
         configuration.set("hbase.rootdir", "hdfs://localhost:9000/hbase");
         try {
             connection = ConnectionFactory.createConnection(configuration);
             admin = connection.getAdmin();
         } catch (IOException e) {
             e.printStackTrace();
         }
         try {
             insertRow("student", "scofield", "score", "English", "45");
             insertRow("student", "scofield", "score", "Math", "89");
             insertRow("student", "scofield", "score", "Computer", "100");
         } catch (IOException e) {
             e.printStackTrace();
         }
         close();
     }

     public static void insertRow(String tableName, String rowKey, String colFamily, String col, String val)
             throws IOException {
         Table table = connection.getTable(TableName.valueOf(tableName));
         Put put = new Put(rowKey.getBytes());
         put.addColumn(colFamily.getBytes(), col.getBytes(), val.getBytes());
         table.put(put);
         table.close();
     }

     public static void close() {
         try {
             if (admin != null) {
                 admin.close();
             }
             if (null != connection) {
                 connection.close();
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

Hbase添加数据

b)    获取scofield的English成绩信息

 import java.io.IOException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.Cell;
 import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 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.client.Get;
 import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.Table;

 public class GetScofieid {
     public static Configuration configuration;
     public static Connection connection;
     public static Admin admin;

     public static void main(String[] args) {
         configuration = HBaseConfiguration.create();
         configuration.set("hbase.rootdir", "hdfs://localhost:9000/hbase");
         try {
             connection = ConnectionFactory.createConnection(configuration);
             admin = connection.getAdmin();
             getData("student", "scofield", "score", "English");
         } catch (IOException e) {
             e.printStackTrace();
         }
         close();
     }

     public static void getData(String tableName, String rowKey, String colFamily, String col) throws IOException {
         Table table = connection.getTable(TableName.valueOf(tableName));
         Get get = new Get(rowKey.getBytes());
         get.addColumn(colFamily.getBytes(), col.getBytes());
         Result result = table.get(get);
         Cell[] cells = result.rawCells();
         for (Cell cell : cells) {
             System.out.println("RowName:" + new String(CellUtil.cloneRow(cell)));
             System.out.println("timestamp:" + cell.getTimestamp());
             System.out.println("column Family:" + new String(CellUtil.cloneFamily(cell)));
             System.out.println("row Name:" + new String(CellUtil.cloneQualifier(cell)));
             System.out.println("value:" + new String(CellUtil.cloneValue(cell)));
         }
         table.close();
     }

     public static void close() {
         try {
             if (admin != null) {
                 admin.close();
             }
             if (null != connection) {
                 connection.close();
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

Hbase获取数据

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