通过删除hbase表中的region来达到删除表中数据
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)
1 // 声明静态配置 2 static Configuration conf = null; 3 static { 4 conf = HBaseConfiguration.create(); 5 //conf.set("hbase.zookeeper.quorum", "172.16.71.171"); 6 conf.set("hbase.zookeeper.quorum", "com23.authentication,com22.authentication,com21.authentication"); 7 conf.set("hbase.zookeeper.property.clientPort", "2181"); 8 conf.set("hbase.zookeeper.quorum", "172.16.71.171"); 9 conf.set("hbase.master", "172.16.71.171:600000"); 10 conf.set("hbase.client.keyvalue.maxsize", "524288000");// 最大500m 11 conf.set("hbase.rootdir", "hdfs://h1.hadoop:8020/hbase");// 最大500m 12 }
1 @SuppressWarnings("deprecation") 2 public static boolean deletByRegions(String tableName,String startKey) { 3 boolean flag = true; 4 Connection conn = null; 5 Table meta_table =null; 6 HTable table = null; 7 try { 8 conn = ConnectionFactory.createConnection(conf); 9 meta_table = conn.getTable(TableName.META_TABLE_NAME); 10 table = new HTable(conf, Bytes.toBytes(tableName)); //HTabel负责跟记录相关的操作如增删改查 11 HBaseAdmin admin = new HBaseAdmin(conf); //HBaseAdmin负责跟表相关的操作如create,drop等 12 HRegionInfo regionInfo = table.getRegionLocation(startKey).getRegionInfo(); 13 String tableNameDataDir = "/data/default/" + tableName; 14 FileSystem fs = FileSystem.get(HdfsUtils.conn()); 15 Path rootDir = new Path(conf.get("hbase.rootdir") + tableNameDataDir); 16 HRegionFileSystem.deleteRegionFromFileSystem(conf, fs, rootDir, regionInfo); 17 18 String regionNameAsString = regionInfo.getRegionNameAsString(); 19 HConnection connection = HConnectionManager.getConnection(conf); 20 //获取region的regionServerName 21 HRegionLocation locateRegion = connection.locateRegion(Bytes.toBytes(regionNameAsString)); 22 ServerName serverName_temp = locateRegion.getServerName(); 23 admin.closeRegion(serverName_temp,regionInfo); 24 List list = new ArrayList(); 25 Delete d1 = new Delete(regionNameAsString.getBytes()); 26 list.add(d1); 27 meta_table.delete(list); 28 meta_table.close(); 29 } catch (IOException e) { 30 flag = false; 31 e.printStackTrace(); 32 } finally { 33 if ( table != null) { 34 try { 35 table.close(); 36 } catch (IOException e) { 37 flag = false; 38 e.printStackTrace(); 39 } 40 } 41 } 42 return flag; 43 }