Hbase基于jdbc操作批量查询写入优化及应用

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;


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.client.Durability;
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.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.MD5Hash;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import com.cslo.lsmp.hadoop.user.commom.CounterMap.Counter;




public class HbaseUtil {

private static final Logger LOGGER = LoggerFactory.getLogger(HbaseUtil.class);
static HashMap rowKeyCounterMap = new HashMap();
static Configuration hConfig;
static HTable hTable;

static {  
   hConfig = HBaseConfiguration.create();
   //本地
   hConfig.set("hbase.zookeeper.quorum", "cdh1,cdh2,cdh3");
   } 
/** 
     * 创建表 (需要删除原有数据时使用)
     * @param tableName 
     */  
    public static void createTable(String tableName,String[] familys) {  
        try {  
            HBaseAdmin hBaseAdmin = new HBaseAdmin(hConfig);  
            if (hBaseAdmin.tableExists(tableName)) {// 如果存在要创建的表，那么先删除，再创建  
                hBaseAdmin.disableTable(tableName);  
                hBaseAdmin.deleteTable(tableName);  
                System.out.println(tableName + " is exist,detele....");  
            }  
            HTableDescriptor tableDescriptor = new HTableDescriptor(tableName);
            if(familys!=null&&familys.length>0){
            for(String family:familys){
            tableDescriptor.addFamily(new HColumnDescriptor(family));
            }
           
            }
            
            hBaseAdmin.createTable(tableDescriptor);  
        } catch (Exception e) {  
        LOGGER.error("HBase获取createTable  errmsg:{}", 
        e.toString()); 
        } 
    }

/**
* @param tableName  表名
*/
public static void getTable(String tableName) {

try {
hTable = new HTable(hConfig, tableName);
hTable.setWriteBufferSize(6 * 1024 * 1024); //4MB  
hTable.setAutoFlush(false); 
} catch (IOException e) {
LOGGER.error("HBase获取getTable  errmsg:{}", 
        e.toString()); 
}
}


public static void incerment(String rowKey, String key, Object value) {
CounterMap counterMap = rowKeyCounterMap.get(rowKey);
if (counterMap == null) {
counterMap = new CounterMap();
// rowKey=Md5Util.generateRowkey(rowKey);
rowKeyCounterMap.put(rowKey, counterMap);
}
counterMap.increment(key, value);
}


/**
* 
* @param tablelie  列族名
*/
public static Boolean flushToHBase(String tablelie) {
Boolean bl=true;
List puts = new ArrayList();
Long writebufsize=0l;
try {
for (Entry entry : rowKeyCounterMap.entrySet()) {
CounterMap pastCounterMap = entry.getValue();
byte[] rowkey=HashRowKey(entry.getKey());
Put put = new Put(rowkey);
for (Entry entry2 : pastCounterMap.entrySet()) {
String key = entry2.getKey();
Counter value = entry2.getValue();
String values = "";
if (value != null) {
Object valObj = value.value;
if (valObj != null) {
values = valObj.toString();
}
}
put.addColumn(Bytes.toBytes(tablelie), Bytes.toBytes(key),
Bytes.toBytes(values));
writebufsize+=put.heapSize();
}
put.setDurability(Durability.SKIP_WAL);
// put.setWriteToWAL(false);
puts.add(put);
//Put数据超过的时候提交
if(writebufsize>6 * 1024 * 1024){
hTable.put(puts);
hTable.flushCommits();
LOGGER.info("插入到资讯表中hTable"+"_count___writebufsize--"+writebufsize+"puts--"+puts.size());
puts.clear();

writebufsize=0l;

}
}
hTable.put(puts);
hTable.flushCommits();
rowKeyCounterMap.clear();
// LOGGER.info("插入到资讯表中hTable"+"_count___"+n +"writebufsize--"+writebufsize+"puts--"+puts.size());
// }

} catch (IOException e) {
bl=false;
LOGGER.error("HBase获取flushToHBase  errmsg:{}", 
        e.toString()); 

}
return bl;
}
/**
* 查询一条记录
* @param rowKey
* @return
* @throws IOException
*/
public static String getFromHBase(String rowKey,String family,String name) {
String result="";
try {
Get get=new Get(rowKey.getBytes());

// get.addFamily(family.getBytes());
   Result res =hTable.get(get);
   if(res!=null&&res.getRow()!=null){
    result=res.getValue(family.getBytes(), name.getBytes()).toString();
   }
} catch (IOException e) { 
            e.printStackTrace(); 
        }
        return result;
}
public static void clearHbase() {
try {
if(hTable!=null){
hTable.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
LOGGER.error("clearHbase  errmsg:{}", 
        e.toString());
}finally{
hTable=null;
}
}
/**
* 
* @param hash rowkey
* @return
*/
public static byte[] HashRowKey(String rowkey) {
       
    byte[] bytes = Bytes.toBytes(rowkey);  
         String hashPrefix = MD5Hash.getMD5AsHex(bytes).substring(0, 4);  
//         System.out.println(hashPrefix);  
   
         byte[] bytes2 = Bytes.toBytes(hashPrefix);  
         //rowkey取md5(userid)的前四位+userid.前四位用来散列userid,避免写入热点。缺点，不支持顺序scan userId.  
//         System.out.println(Bytes.add(bytes2, bytes));  
         return Bytes.add(bytes2, bytes);  
        
        
    }
}