最近遇到的问题，需要删除指定列族下的指定列，考虑到原理就是扫描hbase表，获取rowkey，进行删除，value值的返回没有意义。但是怎么能快速扫描呢？高性能肯定是第一考虑点，废话不说，上代码：
public static void delete(Configuration config, String tableName, String cf, String qualifier) {Connection connection = null;HTable hTable = null;try {connection = ConnectionFactory.createConnection(config);hTable = new HTable(TableName.valueOf(tableName), connection);Scan scan = new Scan();// 参数根据情况自行设置 以下三个参数最好设置 提高速度scan.setCaching(10000);scan.setCacheBlocks(false);// KeyOnlyFilter只返回行键列族和列 不返回值 对于此种情况删除来说不需要值scan.setFilter(new KeyOnlyFilter());scan.addColumn(cf.getBytes(), qualifier.getBytes());Iterator<Result> iterator = hTable.getScanner(scan).iterator();for (int i = 0; i < 1000; i++) {ArrayList<Delete> deletes = new ArrayList<>();while (iterator.hasNext() && deletes.size() <= 100000) {Result next = iterator.next();Delete delete = new Delete(next.getRow());if (next.containsColumn(cf.getBytes(), qualifier.getBytes())) {delete.deleteColumn(cf.getBytes(), qualifier.getBytes());deletes.add(delete);}}if (deletes.size() != 0){hTable.delete(deletes);}else {break;}}hTable.close();connection.close();} catch (IOException e) {e.printStackTrace();}}