网上能查到的hbase提高基于列的查询效率基本上是建立二级索引的方法，介绍另外一种方法，使用分布式索引技术elasticsearch来提高效率，
基本思路和二级索引差不多，都是通过对要查询的列建立索引，先根据建立的列索引查询到rowkey，再根据rowkey查询到需要的数据，步骤如下：
1. 安装elasticsearch，安装简单，网上查找安装方法
2.使用elasticsearch建立hbase的相关查询列的索引，值包括查询列与rowkey
3.使用ealsticsearch查询到列对应的rowkey值，再根据rowkey查询需要的信息
代码只包括第3步：
package hbase;import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.FilterBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
public class SearchWithElasticSearch {
public static void main(String[] args) throws IOException{
//elasticsearch相关设置
Settings settings = ImmutableSettings.settingsBuilder()
//指定集群名称
.put("cluster.name", "elasticsearch")
.put("client.transport.sniff", true).build();
// 创建客户端，
Client client = new TransportClient(settings)
//ip改为自己的ip
.addTransportAddress(new InetSocketTransportAddress("ip", 9300));
//elasticsearch查询，查询NAME为blacklau的记录
SearchResponse response = client.prepareSearch("hbase")
.setTypes("netflow")
.setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
// NAME对应hbase表的列名
.setPostFilter(FilterBuilders.termFilter("NAME", "blacklau"))
.execute()
.actionGet();
SearchHits shs = response.getHits();
//根据查询到的rowkeys构建Get
List<Get> gets = new ArrayList<Get>();
for(SearchHit hit : shs){
//ROWKEY对应hbase表的rowkey
String rowkey = (String)hit.getSource().get("ROWKEY");
Get get = new Get(Bytes.toBytes(rowkey));
gets.add(get);
}
if(gets.size() == 0) return;
HTable table=new HTable(HBaseConfiguration.create(),"netflow");
Result[] rs=table.get(gets);
//打印hbase表查询结果
for(Result r:rs){
System.out.println(r);
}
client.close();
table.close();
}
}