hbase java api, NoClassDefFoundError: org/apache/hadoop/hbase/HBaseConfiguratio

1 Java api 操作hbase代码写法如下:

package hbase;

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

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.KeyValue;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.HTableInterface;
import org.apache.hadoop.hbase.client.HTablePool;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.util.Bytes;

// hbase shell 和对应 java api操作大全  http://blog.csdn.net/wulantian/article/details/41011297 
/**
 * 如果在执行  build-hbase.xml时遇到 connect的错误,请多次重复执行  虚拟机第一次连接基本都连接不上 
 * @author Administrator
 *
 */
public class MyHbaseAPI {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Configuration conf = getConf();
		
		// 查询所有表
		/*try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			HTableDescriptor[]  desors = hBaseAdmin.listTables();
			for(int i=0; i<desors.length; i++){
				HTableDescriptor desor = desors[i];
				TableName tableName = desor.getTableName();
				System.out.println("tablename is: " + tableName.getNameAsString());
			}
		} catch (Exception e) {
			e.printStackTrace();
		} */
		
		// 删除表
	/*	try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			hBaseAdmin.disableTable("tea"); // 先disable 否则会报还没有disable 异常
			hBaseAdmin.deleteTable("tea");
		} catch (Exception e) {
			e.printStackTrace();
		} */
		
		
		// 创建表
		/*try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			// 设置表名   这个类是表名和列族的容器
			HTableDescriptor hTableDescriptor = new HTableDescriptor("teacher");
			// 设置两个列族名
			HColumnDescriptor basecolumnDescriptor = new HColumnDescriptor("base");
			HColumnDescriptor morecolumnDescriptor = new HColumnDescriptor("more");
			// 列族加入到表中
			hTableDescriptor.addFamily(basecolumnDescriptor);
			hTableDescriptor.addFamily(morecolumnDescriptor);
			// 创建之
			hBaseAdmin.createTable(hTableDescriptor);
			
			boolean exist = hBaseAdmin.tableExists("teacher");
			System.out.println("创建的新表teacher成功了吗? " + exist);
			
		} catch (Exception e) {
			e.printStackTrace();
		} */
		
		/*
		 * boolean b = admin.isTableDisabled("stu");
		 * if(!b){
			hBaseAdmin.disableTable("emp");
			System.out.println("Table disabled"); 停用此表
		}esle{
			hBaseAdmin.enableTable("emp"); // 启动此表
		}*/
		
		// 向hbase表插入/更新 数据
		/*try {
			HTablePool htablepool = new HTablePool(conf, 1000);
			HTableInterface htable = htablepool.getTable("stu");
			//HTable htable = new HTable(conf, "stu");  建议用pool方式获得表
			List  puts = new ArrayList<Put>();
			Put put1 = new Put("2".getBytes());
			put1.add("base".getBytes(), "name".getBytes(), "baobao".getBytes());
			Put put2 = new Put("2".getBytes());
			put2.add("base".getBytes(), "age".getBytes(), "1".getBytes());
			//Put put3 = new Put("2".getBytes());
			//put3.add("more".getBytes(), "weigth".getBytes(), "3.5kg".getBytes());
			//Put put4 = new Put("2".getBytes());
			//put4.add("more".getBytes(), "height".getBytes(), "50cm".getBytes());
			puts.add(put1);
			puts.add(put2);
			//puts.add(put3);
			//puts.add(put4);
			htable.put(puts);
			htable.close();
		} catch (Exception e) {
			e.printStackTrace();
		} */
		
		// hbase删除一条数据的指定列
	/*	try {
			HTable htable = new HTable(conf, "stu");
			Delete delete = new Delete("3".getBytes()); // 删除整行数据
			//delete.deleteFamily("base".getBytes());  // 删除整个列族
			delete.deleteColumn("base".getBytes(), "sex".getBytes()); // 删除某个列
			htable.delete(delete);
			htable.close();
		} catch (Exception e) {
			e.printStackTrace();
		}*/
		
		// 查询单条记录所有数据
		/*try {
			HTable htable = new HTable(conf, "stu");
			Get get = new Get("2".getBytes());
			Result result = htable.get(get);
			//String name = Bytes.toString(result.getValue("base".getBytes(), "name".getBytes()));
			//String age = Bytes.toString(result.getValue("base".getBytes(), "age".getBytes()));
			//String weight = Bytes.toString(result.getValue("more".getBytes(), "weight".getBytes()));
			//String high = Bytes.toString(result.getValue("more".getBytes(), "high".getBytes()));
			for(KeyValue kv : result.raw()){ // 得到组成result的各个单元cell, 这些cell是由row, family, qualifier,value等组成, 如果id为2下有多条则遍历后将每一行的列输出
				System.out.println("rowkey: " + Bytes.toString(kv.getRow()));
				System.out.println("family: " +  Bytes.toString(kv.getFamily()));
				System.out.println("Qualifier: " +  Bytes.toString(kv.getQualifier()));
				System.out.println("value: " +  Bytes.toString(kv.getValue()));
			}
			
			//System.out.println("name: " + name + " age: " + age + " weight: " + weight + " high: " + high);
			htable.close();
		} catch (Exception e) {
			e.printStackTrace();
		}*/
		
		// 查询单条记录某一列数值
		/*try {
			HTable htable = new HTable(conf, "stu");
			Get get = new Get("2".getBytes());
			get.addColumn("base".getBytes(), "name".getBytes());
			Result result = htable.get(get);
			String name = Bytes.toString(result.getValue("base".getBytes(), "name".getBytes()));
			String age = Bytes.toString(result.getValue("base".getBytes(), "age".getBytes())); // 得到 null
			System.out.println("name: " + name + " age: " + age);
			htable.close();
		} catch (Exception e) {
			e.printStackTrace();
		}*/
		
		
		// 增加和删除表中的列族
	/*	try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			//hBaseAdmin.deleteColumn("stu", "more"); //Column family  删除表列族
			HColumnDescriptor morecolumnDescriptor = new HColumnDescriptor("more"); // 增加列族
			hBaseAdmin.addColumn("stu", morecolumnDescriptor);
		} catch (Exception e) {
			e.printStackTrace();
		}*/
		
		// 关闭hbase集群
		/*try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			//hBaseAdmin.stopMaster()
			//hBaseAdmin.stopRegionServer(hostnamePort)
			hBaseAdmin.shutdown(); // 关闭hbase
		} catch (Exception e) {
			e.printStackTrace();
		}*/
		
		// 插入列
		/*try {
			HTable htable = new HTable(conf, "stu");
			List  puts = new ArrayList<Put>();
			Put put1 = new Put("3".getBytes());
			put1.add("base".getBytes(), "sex".getBytes(), "man".getBytes());
			puts.add(put1);
			htable.put(puts);
			htable.close();
		} catch (Exception e) {
			e.printStackTrace();
		} */
		
		// scan过滤器
	/*	try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			HTable htable = new HTable(conf, "stu");
			Scan scan = new Scan();
			scan.setStartRow("1".getBytes()); // 增加开始rowkey  包含
			scan.setStopRow("3".getBytes()); //增加结束rowkey  不包含
			scan.addColumn("base".getBytes(), "name".getBytes());// 扫描中增加 列族 列名
			ResultScanner resultScanner = htable.getScanner(scan);
			for(Result result : resultScanner){ //result: HBase cell defined by the row, family, qualifier, timestamp, and value
				if(result.raw().length==0){
					System.out.println("stu 表数据为空");
				}else{
					for(KeyValue kv : result.raw()){ // 得到组成result的各个单元cell, 这些cell是由row, family, qualifier,value等组成
						System.out.println(Bytes.toString(kv.getRow()));
						System.out.println(Bytes.toString(kv.getFamily()));
						System.out.println(Bytes.toString(kv.getQualifier()));
						System.out.println(Bytes.toString(kv.getValue()));
					}
				}
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}*/
		
		// scan + filter过滤器
		try {
			HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);
			HTable htable = new HTable(conf, "stu");
			Scan scan = new Scan();
			scan.setStartRow("1".getBytes()); // 增加开始rowkey  包含
			scan.setStopRow("3".getBytes()); //增加结束rowkey  不包含
			scan.addColumn("base".getBytes(), "name".getBytes());// 扫描中增加 列族 列名
			ResultScanner resultScanner = htable.getScanner(scan);
			for(Result result : resultScanner){ //result: HBase cell defined by the row, family, qualifier, timestamp, and value
				if(result.raw().length==0){
					System.out.println("stu 表数据为空");
				}else{
					for(KeyValue kv : result.raw()){ // 得到组成result的各个单元cell, 这些cell是由row, family, qualifier,value等组成
						System.out.println(Bytes.toString(kv.getRow()));
						System.out.println(Bytes.toString(kv.getFamily()));
						System.out.println(Bytes.toString(kv.getQualifier()));
						System.out.println(Bytes.toString(kv.getValue()));
					}
				}
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	
		
		// filter过滤器  见别的链接
		
		
	}

	
	private static Configuration getConf() {
		Configuration conf = null;
		conf = HBaseConfiguration.create();
		conf.set("hbase.zookeeper.quorum", "hadoop3");  
		conf.set("hbase.rootdir", "hdfs://hadoop3:9000/hbase"); 
		return conf;
	}

}

 filter过滤器, 实际上定义好你过滤规则filter后, 直接丢给 scan即可然后让scan扫描:

 scan.setFilter(filter); // 增加过滤器

关于过滤器,见:  hbase scan filter以及hbase逻辑存储图和hbase打印数据效果 编辑

2  在 hbase + hadoop2 + zk 构建的集群的时候注意事项:

hbase: h2master主  h2sliver113 从  h2sliver114从

hadoop: h2single

zookeeper:  h2master h2sliver113  h2sliver114

将上面代码打包后 放在hadoop上通过执行:

bin/hadoop jar XX.jar 包.类执行的时候,报错如下:



 

错误原因:  hadoop2节点无法加载到hbase包

处理方式1:

将hbase jar拷贝到hadoop 节点上,注意请将hbase/lib下的所有包都拷贝过去,比如 /usr/local/hbaselib。

曾经尝试过只将

hbase client, hbase common, hbase server拷贝过去,但是在build-hbase.xml执行时报错:

NoClassDefFoundError: org/cloudera/htrace/Trace

然后在 hadooop/etc/hadoop/hadoop-env.sh中 增加如下:

for f in /usr/local/hbaselib/*.jar; do
  if [ "$HADOOP_CLASSPATH" ]; then
    export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$f
  else
    export HADOOP_CLASSPATH=$f
  fi
done

最后 可以在 hadoop/bin/mapred classpath下 查看是否已经将hbase lib 加载进来。

处理方式2:

或者直接都不需要拷贝hase jar包,  hadooop/etc/hadoop/hadoop-env.sh中 增加

export HADOOP_CLASSPATH=/opt/hbase-0.98.12/lib/*

这两种方式都测试过,现在用方式2, 下面截图是这两种方式的设置:



 

 

 处理方式3:   下面写法是执行 bulkload引入外部jar的写法

 使用shell脚本执行jar程序

使用shell脚本执行jar程序
pt='.'
for jar in `ls /某路径/*.jar  /某路径/*.jar  /某路径/*.jar`
do
 pt=$pt:$jar
done
echo $pt

贴上以前这种使用方式写法: 

jars=`ls $PROJECT_HOME/lib`
for jar in $jars
do
    CLASSPATH="$CLASSPATH:$PROJECT_HOME/lib/$jar"   
done

CLASSPATH=/etc/hdfs1/conf:/etc/hadoop/conf:/etc/hbase/conf:$CLASSPATH  

java -Djava.library.path=/usr/lib/hadoop/lib/native -cp $CLASSPATH com.transwarp.hbase.bulkload.ImportTextFile2HBase $CONF_FILE -test

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转载自chengjianxiaoxue.iteye.com/blog/2169688
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