公司最近在搞一个hbase删除数据，由于在建表的时候是通过region来对每日的数据进行存储的，所以要求在删除的时候直接通过删除region的来删除数据
（最好的方案是只删除region中的数据，不把region删掉，但是百度了很久没找到只删除region中数据的解决方法，实在遗憾，最终也就通过删除region来删除数据了
 这样的弊端是在hbase 中执行scan全表的时候 会报错，找不到某某region，只能通过rowkey来查询别的数据 真的很烦~~~ 以后有时间在来研究这个region吧）

  // 声明静态配置

     static Configuration conf = null;

     static {

         conf = HBaseConfiguration.create();

         //conf.set("hbase.zookeeper.quorum", "172.16.71.171");

         conf.set("hbase.zookeeper.quorum", "com23.authentication,com22.authentication,com21.authentication");

         conf.set("hbase.zookeeper.property.clientPort", "2181");

         conf.set("hbase.zookeeper.quorum", "172.16.71.171");

         conf.set("hbase.master", "172.16.71.171:600000");

         conf.set("hbase.client.keyvalue.maxsize", "524288000");// 最大500m

         conf.set("hbase.rootdir", "hdfs://h1.hadoop:8020/hbase");// 最大500m

     }

 1 @SuppressWarnings("deprecation")

     public static boolean deletByRegions(String tableName,String startKey) {

         boolean flag = true;

         Connection conn = null;

         Table meta_table =null;

         HTable table = null;

         try {

             conn = ConnectionFactory.createConnection(conf);

             meta_table = conn.getTable(TableName.META_TABLE_NAME);

             table = new HTable(conf, Bytes.toBytes(tableName)); //HTabel负责跟记录相关的操作如增删改查

             HBaseAdmin admin = new HBaseAdmin(conf); //HBaseAdmin负责跟表相关的操作如create,drop等

             HRegionInfo regionInfo = table.getRegionLocation(startKey).getRegionInfo();

             String tableNameDataDir = "/data/default/" + tableName;

             FileSystem fs = FileSystem.get(HdfsUtils.conn());

             Path rootDir = new Path(conf.get("hbase.rootdir") + tableNameDataDir);

             HRegionFileSystem.deleteRegionFromFileSystem(conf, fs, rootDir, regionInfo); 

             String regionNameAsString = regionInfo.getRegionNameAsString();

             HConnection connection = HConnectionManager.getConnection(conf);

             //获取region的regionServerName

             HRegionLocation locateRegion = connection.locateRegion(Bytes.toBytes(regionNameAsString));

             ServerName serverName_temp = locateRegion.getServerName();

             admin.closeRegion(serverName_temp,regionInfo);

             List list = new ArrayList();

             Delete d1 = new Delete(regionNameAsString.getBytes());

             list.add(d1);

             meta_table.delete(list);

             meta_table.close();

         } catch (IOException e) {

             flag = false;

             e.printStackTrace();

         }    finally {

             if ( table != null) {

                 try {

                     table.close();

                 } catch (IOException e) {

                     flag = false;

                     e.printStackTrace();

                 }

             }

         }

         return flag;

     }