环境准备
需 要环境:
PC-1 Suse Linux 9 10.192.1.1
PC-2 Suse Linux 9 10.192.1.2
PC-3 Suse Linux 9 10.192.1.3
PC-4 Suse Linux 9 10.192.1.4
其中,PC-1做namenode节点,PC-2、PC-3和PC-4做datanode节点。
并且已经安装成功Hadoop-0.20.1及以上版本。
安装包准备
需要安装包:
zookeeper-3.2.1.tar.gz(stable版本)
hbase-0.20.1.tar.gz(stable版本)
安装步骤
安 装和配置ZooKeeper
HBase从0.20.0开始,需要首先安装ZooKeeper。从apache上下载zookeeper-3.2.1.tar.gz(Stable版本),解压到/home/hdfs/目录下。
(1),在namenode节点新建zookeeper目录,在该目录下新建myid文件。
(2),在zookeeper-3.2.1/conf目录下,拷贝zoo_sample.cfg为zoo.cfg。在zoo.cfg中将dataDir改为/home/hdfs/zookeeper,在文件末位添加所有的主机:
server.1=10.192.1.1:2888:3888
server.2=10.192.1.2:2888:3888
server.3=10.192.1.3:2888:3888
server.4=10.192.1.4:2888:3888
server.5=10.192.1.5:2888:3888
server.6=10.192.1.62888:3888
(3)用scp命令将namenode节点的的/home/hdfs/ zookeeper-3.2.1和/home/hdfs/ zookeeper拷贝到其余所有主机的/home/hdfs目录下。
(4)参照zoo.cfg中的配置,在各主机myid文件中写入各自的编号。如:10.192.1.1入1,10.192.1.2写入2
(5)在所有节点上执行bin/zkServer.sh start, 分别启动。
执行bin/zkCli.sh -server xxx.xxx.xxx.xxx:2181,检查指定服务器是否成功启动。
安装和配置HBase
下载HBase
0.20.1版本,解压到namenode节点的/home/hdfs目录下。
配置说明
(1)系统所有配置项的默认设置在hbase-default.xml中查看,如果需要修改配置项的值,在hbase-site.xml中添加配置项。
在分布式模式下安装HBase,需要添加的最基本的配置项如下:
<property>
<name>hbase.rootdir</name>
<value>hdfs://namenode.hdfs:54310/hbase</value>
<description>The directory shared by region servers.</description>
</property>
<property>
<name>hbase.cluster.distributed</name>
<value>true</value>
<description>The mode the cluster will be in. Possible values are
false: standalone and pseudo-distributed setups with managed Zookeeper
true: fully-distributed with unmanaged Zookeeper Quorum (see hbase-env.sh)
</description>
</property>
(2)在conf/hbase-env.sh中修改添加配置项:
export JAVA_HOME=/usr/java/jdk1.6.0_16
export HBASE_MANAGES_ZK=false
export HBASE_CLASSPATH=/home/hdfs/hadoop-0.20.1/conf
并把~/hadoop-0.20.1/conf/hdfs-site.xml拷贝至~/hbase-3.2.1/conf/目录下。
(3)将ZooKeeper的配置文件zoo.cfg添加到HBase所有主机的CLASSPATH中。
(4)在conf/regionservers中添加hadoop-0.20.1/conf/slaves中所有的datanode节点。
启动
Hadoop、ZooKeeper和HBase之间应该按照顺序启动和关闭:启动Hadoop―>启动ZooKeeper集群―>启动HBase―>停止HBase―>停止ZooKeeper集群―>停止Hadoop。
在namenode节点执行bin/hbase-daemon.sh,启动master。执行bin/start-hbase.sh和bin/stop-hbase.sh 脚本启动和停止HBase服务。
接口说明
HBase按列存储结构化数据,支持建表、插入记录、查询记录、删除记录和索引操作等等,不支持连接和更新操 作。
开发步骤
引入JAR包
在Windows客户端编写JAVA程序操作HBase,需要引入一些JAR包。需要引入的JAR如下:hadoop-0.20.1-core.jar,commons-logging-1.0.4.jar,commons-logging-api-1.0.4.jar,zookeeper-3.2.1.jar,hbase-0.20.1.jar,log4j-1.2.15.jar。
开发模式
在分布式模式下开发,在程序中 配置与HDFS和ZooKeeper的连接,即可对数据进行操作。
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- import java.util.Date;
- import java.text.SimpleDateFormat;
- import java.io.IOException;
- import java.awt.List;
- import java.util.Map;
- import java.util.NavigableMap;
-
- import org.apache.hadoop.hbase.HBaseConfiguration;
- import org.apache.hadoop.hbase.HTableDescriptor;
- import org.apache.hadoop.hbase.HColumnDescriptor;
- import org.apache.hadoop.hbase.client.HBaseAdmin;
- import org.apache.hadoop.hbase.client.HTable;
-
- import org.apache.hadoop.hbase.client.Put;
- import org.apache.hadoop.hbase.client.Get;
- import org.apache.hadoop.hbase.client.Scan;
- import org.apache.hadoop.hbase.client.ResultScanner;
- import org.apache.hadoop.hbase.client.Delete;
- import org.apache.hadoop.hbase.client.Result;
- import org.apache.hadoop.hbase.util.Bytes;
-
- public class HBaseManager {
- public static void main(String[] args) throws Exception{
- HBaseManager manager = new HBaseManager();
- manager.testGet();
- }
-
- public void testQueryRS()throws Exception{
- HBaseConfiguration config = new HBaseConfiguration();
- config.set("hbase.master", "10.192.1.1:60000");
- config.set("hbase.zookeeper.quorum", "10.192.1.1");
-
- HTable table = new HTable(config, "commodity");
-
- System.out.println("Get Spin's commodity info");
-
- Scan scanner = new Scan();
- scanner.addColumn(Bytes.toBytes("description"));
- scanner.setMaxVersions();
- ResultScanner rsScanner = table.getScanner(scanner);
- System.out.println(rsScanner.toString());
- Result rs = rsScanner.next();
- while(null != rs){
- System.out.println(rs.size());
- NavigableMap<byte[],NavigableMap<byte[],NavigableMap<Long,byte[]>>> nMap = rs.getMap();
- NavigableMap<byte[],NavigableMap<Long,byte[]>> columnMap = nMap.get(Bytes.toBytes("description"));
- NavigableMap<Long,byte[]> qualMap = columnMap.get(new byte[]{});
-
- if(qualMap.entrySet().size() > 0){
- System.out.println("---------------------------");
- for(Map.Entry<Long, byte[]> m :qualMap.entrySet())
- {
- System.out.println("Value:"+ new String(m.getValue()));
- }
- }
- rs = rsScanner.next();
- }
- }
-
- public void testQueryCommodity()throws Exception{
- HBaseConfiguration config = new HBaseConfiguration();
- config.set("hbase.master", "10.192.1.1:60000");
- config.set("hbase.zookeeper.quorum", "10.192.1.1.203");
-
- HTable table = new HTable(config, "commodity");
-
- System.out.println("Get Spin's commodity info");
- Get mathGet = new Get(new String("Spin").getBytes());
- mathGet.addColumn(Bytes.toBytes("widgetname"));
- mathGet.setMaxVersions();
- Result rs = table.get(mathGet);
-
- NavigableMap<byte[],NavigableMap<byte[],NavigableMap<Long,byte[]>>> nMap = rs.getMap();
- NavigableMap<byte[],NavigableMap<Long,byte[]>> columnMap = nMap.get(Bytes.toBytes("widgetname"));
- NavigableMap<Long,byte[]> qualMap = columnMap.get(new byte[]{});
-
- if(qualMap.entrySet().size() > 0){
- for(Map.Entry<Long, byte[]> m :qualMap.entrySet())
- {
- System.out.println("Value:"+ new String(m.getValue()));
-
- break;
- }
- }
- }
-
- public void test()throws Exception{
- HBaseConfiguration config = new HBaseConfiguration();
- config.set("hbase.master", "10.192.1.1:60000");
- config.set("hbase.zookeeper.quorum", "10.192.1.1");
- HBaseAdmin admin = new HBaseAdmin(config);
- HTable table = new HTable(config, "scores");
-
- if (admin.tableExists("scores")){
- System.out.println("drop table");
- admin.disableTable("scores");
- admin.deleteTable("scores");
- }
-
- System.out.println("create table");
- HTableDescriptor tableDescripter = new HTableDescriptor("scores".getBytes());
- tableDescripter.addFamily(new HColumnDescriptor("grade"));
- tableDescripter.addFamily(new HColumnDescriptor("course"));
-
- admin.createTable(tableDescripter);
-
- System.out.println("add Tom's data");
-
- Put tomPut = new Put(new String("Tom").getBytes());
- tomPut.add(new String("grade").getBytes(), new byte[]{}, new String("1").getBytes());
- tomPut.add(new String("grade").getBytes(), new String("math").getBytes(), new String("87").getBytes());
- tomPut.add(new String("course").getBytes(), new String("math").getBytes(), new String("97").getBytes());
- table.put(tomPut);
-
- System.out.println("add Jerry's data");
-
- Put jerryPut = new Put(new String("Jerry").getBytes());
- jerryPut.add(new String("grade").getBytes(), new byte[]{}, new String("2").getBytes());
- jerryPut.add(new String("grade").getBytes(), new String("math").getBytes(), new String("77").getBytes());
- jerryPut.add(new String("course").getBytes(), new String("math").getBytes(), new String("92").getBytes());
- table.put(jerryPut);
-
- System.out.println("Get Tom's data");
- Get tomGet = new Get(new String("Tom").getBytes());
- Result tomResult = table.get(tomGet);
- System.out.println(tomResult.toString());
-
- System.out.println("Get Tom's Math grade");
- Get mathGet = new Get(new String("Tom").getBytes());
- mathGet.addColumn(Bytes.toBytes("grade"));
- mathGet.setMaxVersions();
- Result rs = table.get(mathGet);
-
- NavigableMap<byte[],NavigableMap<byte[],NavigableMap<Long,byte[]>>> nMap = rs.getMap();
- NavigableMap<byte[],NavigableMap<Long,byte[]>> columnMap = nMap.get(Bytes.toBytes("grade"));
- NavigableMap<Long,byte[]> qualMap = columnMap.get(Bytes.toBytes("math"));
-
- for(Map.Entry<Long, byte[]> m :qualMap.entrySet())
- {
-
- System.out.println("TimeStamp:"+m.getKey());
- System.out.println("Value:"+ new String(m.getValue()));
- }
-
- System.out.println("Delete a column");
- Delete deleteArt = new Delete(Bytes.toBytes("Tom"));
- deleteArt.deleteColumn(Bytes.toBytes("grade"), Bytes.toBytes("math"));
- table.delete(deleteArt);
- }
-
- public void testScanner() throws IOException{
- HBaseConfiguration config = new HBaseConfiguration();
- config.set("hbase.master", "10.192.1.1:60000");
- config.set("hbase.zookeeper.quorum", "10.192.1.1");
-
- HTable table = new HTable(config, "commodity");
-
- System.out.println("Scan commodity info");
-
- Scan scanner = new Scan();
- scanner.addColumn(Bytes.toBytes("widgetname"));
- scanner.addColumn(Bytes.toBytes("filename"));
- scanner.addColumn(Bytes.toBytes("description"));
- scanner.addColumn(Bytes.toBytes("createtime"));
-
-
- ResultScanner rsScanner = table.getScanner(scanner);
-
- Result rs = rsScanner.next();
- for(;null != rs; rs = rsScanner.next()){
- System.out.println("rs.getRow()[" + new String(rs.getRow()) + "]");
- System.out.println("[" + new String(rs.getValue(Bytes.toBytes("widgetname"))) + "]");
- System.out.println("[" + new String(rs.getValue(Bytes.toBytes("filename"))) + "]");
- System.out.println("[" + new String(rs.getValue(Bytes.toBytes("description"))) + "]");
- String timeStr = new String(rs.getValue(Bytes.toBytes("createtime")));
- System.out.println("[" + timeStr + "]");
-
- SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
- try{
- Date after = dateFormat.parse(timeStr);
- System.out.println(after);
- }
- catch(Exception exp){
- exp.printStackTrace();
- }
- }
- }
-
- public void testGet()throws IOException{
- HBaseConfiguration config = new HBaseConfiguration();
- config.set("hbase.master", "10.192.1.1:60000");
- config.set("hbase.zookeeper.quorum", "10.192.1.1");
-
- HTable table = new HTable(config, "commodity");
-
- Get get = new Get(new String("xxxx.wgt").getBytes());
- get.addColumn(Bytes.toBytes("widgetname"));
- get.addColumn(Bytes.toBytes("filename"));
- get.addColumn(Bytes.toBytes("description"));
- get.addColumn(Bytes.toBytes("createtime"));
-
- get.setMaxVersions(2);
- System.out.println("00000000000000");
- Result dbResult = table.get(get);
-
- System.out.println("11111111111111");
- System.out.println(dbResult.size());
- System.out.println("2222222222222222");
- System.out.println(new String(dbResult.value()));
- System.out.println("3333333333333333");
- System.out.println(dbResult.containsColumn(Bytes.toBytes("description"), new byte[]{}));
- System.out.println("44444444444444444");
- System.out.println(dbResult.isEmpty());
- System.out.println("55555555555555555");
- System.out.println(dbResult.list());
- System.out.println("66666666666666666");
- System.out.println(dbResult.raw());
- System.out.println("77777777777777777");
- System.out.println(dbResult.toString());
- System.out.println("88888888888888888");
- System.out.println(dbResult.raw().clone());
- System.out.println("99999999999999999");
- }
- }