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 }