刪除hbase的region步驟和代碼

1、初始化hbase連接

Configuration conf = HbaseCommonsUnit.initConfiguration();
Connection conn = ConnectionFactory.createConnection(conf);
Table meta_table = conn.getTable(TableName.META_TABLE_NAME);
HTable table = new HTable(conf, Bytes.toBytes(tablename)); //HTabel負責跟記錄相關的操作如增刪改查
HBaseAdmin admin = new HBaseAdmin(conf); //HBaseAdmin負責跟表相關的操作如create,drop等

2、刪除Hbase表中Region中StartKey為2014000的Region及Meta中Region的元數據

A、先關閉regionserver中的Region
B、刪除Region在HDFS上的文件
C、刪除Meta表中Region數據記錄信息

String startKey = "2014000";
HRegionInfo regionInfo = table.getRegionLocation(startKey).getRegionInfo();
String tableNameDataDir = "/data/default/" + tablename; 
FileSystem fs = FileSystem.get(conf); 
Path rootDir = new Path(conf.get("hbase.rootdir") + tableNameDataDir);
HRegionFileSystem.deleteRegionFromFileSystem(conf, fs, rootDir, regionInfo); 
String regionNameAsString = regionInfo.getRegionNameAsString(); 
ServerName serverName_temp = StrategyImplementUnit.getServerNameByRegionName(regionNameAsString);//獲取region的regionServerName 
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();

3、創建一個新的region，其中Startkey為NULL

String new_end_key = "2013222";
TableName tableName = TableName.valueOf(tablename);
HRegionInfo regionInfo = new HRegionInfo(tableName, Bytes.toBytes(""), Bytes.toBytes(new_end_key));
HRegionFileSystem.createRegionOnFileSystem(conf, fs, rootDir, regionInfo);

Put put = MetaTableAccessor.makePutFromRegionInfo(regionInfo);
meta_table.put(put);
meta_table.close();

4、關閉hbase的連接

   if ( table != null) {
                try {
                    table.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }