問題導讀:
1.如何根據rowkey模糊查詢?
2.如何使用Comparator過濾rowkey?
3.如何查詢rowkey中包含有某字符串的數據?
RowFilter用於過濾row keyjava
Operator | Description |
LESS | 小於 |
LESS_OR_EQUAL | 小於等於 |
[EQUAL | 等於 |
NOT_EQUAL | 不等於 |
GREATER_OR_EQUAL | 大於等於 |
GREATER | 大於 |
NO_OP | 排除全部 |
Comparator | Description |
BinaryComparator | 使用Bytes.compareTo()比較 |
BinaryPrefixComparator | 和BinaryComparator差很少,從前面開始比較 |
NullComparator | Does not compare against an actual value but whether a given one is null, or not null. |
BitComparator | Performs a bitwise comparison, providing a BitwiseOp class with OR, and XOR operators. |
RegexStringComparator | 正則表達式 |
SubstringComparator | 把數據當成字符串,用contains()來判斷 |
import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.client.HBaseAdmin; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.client.Result; import org.apache.hadoop.hbase.client.ResultScanner; import org.apache.hadoop.hbase.client.Scan; import org.apache.hadoop.hbase.filter.BinaryComparator; import org.apache.hadoop.hbase.filter.BinaryPrefixComparator; import org.apache.hadoop.hbase.filter.CompareFilter; import org.apache.hadoop.hbase.filter.Filter; import org.apache.hadoop.hbase.filter.RegexStringComparator; import org.apache.hadoop.hbase.filter.RowFilter; import org.apache.hadoop.hbase.filter.SubstringComparator; public class TestHbaseRowFilter { String tableName = "test_row_filter"; Configuration config = HBaseConfiguration.create(); /** * 部分代碼來自hbase權威指南 * @throws IOException */ public void testRowFilter() throws IOException { HTable table = new HTable(config, tableName); Scan scan = new Scan(); System.out.println("小於等於row010的行"); Filter filter1 = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL, new BinaryComparator("row010".getBytes())); scan.setFilter(filter1); ResultScanner scanner1 = table.getScanner(scan); for (Result res : scanner1) { System.out.println(res); } scanner1.close(); System.out.println("正則獲取結尾爲5的行"); Filter filter2 = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator(".*5)); scan.setFilter(filter2); ResultScanner scanner2 = table.getScanner(scan); for (Result res : scanner2) { System.out.println(res); } scanner2.close(); System.out.println("包含有5的行"); Filter filter3 = new RowFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator("5")); scan.setFilter(filter3); ResultScanner scanner3 = table.getScanner(scan); for (Result res : scanner3) { System.out.println(res); } scanner3.close(); System.out.println("開頭是row01的"); Filter filter4 = new RowFilter(CompareFilter.CompareOp.EQUAL, new BinaryPrefixComparator("row01".getBytes())); scan.setFilter(filter4); ResultScanner scanner4 = table.getScanner(scan); for (Result res : scanner4) { System.out.println(res); } scanner3.close(); } /** * 初始化數據 */ public void init() { // 建立表和初始化數據 try { HBaseAdmin admin = new HBaseAdmin(config); if (!admin.tableExists(tableName)) { HTableDescriptor htd = new HTableDescriptor(tableName); HColumnDescriptor hcd1 = new HColumnDescriptor("data"); htd.addFamily(hcd1); HColumnDescriptor hcd2 = new HColumnDescriptor("url"); htd.addFamily(hcd2); admin.createTable(htd); } HTable table = new HTable(config, tableName); table.setAutoFlush(false); int count = 50; for (int i = 1; i <= count; ++i) { Put p = new Put(String.format("row%03d", i).getBytes()); p.add("data".getBytes(), String.format("col%01d", i % 10) .getBytes(), String.format("data%03d", i).getBytes()); p.add("url".getBytes(), String.format("col%01d", i % 10) .getBytes(), String.format("url%03d", i).getBytes()); table.put(p); } table.close(); } catch (IOException e) { e.printStackTrace(); } } /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { TestHbaseRowFilter test = new TestHbaseRowFilter(); test.init(); test.testRowFilter(); } }
複製代碼正則表達式
輸出結果apache
小於等於row010的行 keyvalues={row001/data:col1/1364133382268/Put/vlen=7, row001/url:col1/1364133382268/Put/vlen=6} keyvalues={row002/data:col2/1364133382268/Put/vlen=7, row002/url:col2/1364133382268/Put/vlen=6} keyvalues={row003/data:col3/1364133382268/Put/vlen=7, row003/url:col3/1364133382268/Put/vlen=6} keyvalues={row004/data:col4/1364133382268/Put/vlen=7, row004/url:col4/1364133382268/Put/vlen=6} keyvalues={row005/data:col5/1364133382268/Put/vlen=7, row005/url:col5/1364133382268/Put/vlen=6} keyvalues={row006/data:col6/1364133382268/Put/vlen=7, row006/url:col6/1364133382268/Put/vlen=6} keyvalues={row007/data:col7/1364133382268/Put/vlen=7, row007/url:col7/1364133382268/Put/vlen=6} keyvalues={row008/data:col8/1364133382268/Put/vlen=7, row008/url:col8/1364133382268/Put/vlen=6} keyvalues={row009/data:col9/1364133382268/Put/vlen=7, row009/url:col9/1364133382268/Put/vlen=6} keyvalues={row010/data:col0/1364133382268/Put/vlen=7, row010/url:col0/1364133382268/Put/vlen=6} 正則獲取結尾爲5的行 keyvalues={row005/data:col5/1364133382268/Put/vlen=7, row005/url:col5/1364133382268/Put/vlen=6} keyvalues={row015/data:col5/1364133382268/Put/vlen=7, row015/url:col5/1364133382268/Put/vlen=6} keyvalues={row025/data:col5/1364133382268/Put/vlen=7, row025/url:col5/1364133382268/Put/vlen=6} keyvalues={row035/data:col5/1364133382268/Put/vlen=7, row035/url:col5/1364133382268/Put/vlen=6} keyvalues={row045/data:col5/1364133382268/Put/vlen=7, row045/url:col5/1364133382268/Put/vlen=6} 包行有5的行 keyvalues={row005/data:col5/1364133382268/Put/vlen=7, row005/url:col5/1364133382268/Put/vlen=6} keyvalues={row015/data:col5/1364133382268/Put/vlen=7, row015/url:col5/1364133382268/Put/vlen=6} keyvalues={row025/data:col5/1364133382268/Put/vlen=7, row025/url:col5/1364133382268/Put/vlen=6} keyvalues={row035/data:col5/1364133382268/Put/vlen=7, row035/url:col5/1364133382268/Put/vlen=6} keyvalues={row045/data:col5/1364133382268/Put/vlen=7, row045/url:col5/1364133382268/Put/vlen=6} keyvalues={row050/data:col0/1364133382268/Put/vlen=7, row050/url:col0/1364133382268/Put/vlen=6} 開頭是row01的 keyvalues={row010/data:col0/1364133382268/Put/vlen=7, row010/url:col0/1364133382268/Put/vlen=6} keyvalues={row011/data:col1/1364133382268/Put/vlen=7, row011/url:col1/1364133382268/Put/vlen=6} keyvalues={row012/data:col2/1364133382268/Put/vlen=7, row012/url:col2/1364133382268/Put/vlen=6} keyvalues={row013/data:col3/1364133382268/Put/vlen=7, row013/url:col3/1364133382268/Put/vlen=6} keyvalues={row014/data:col4/1364133382268/Put/vlen=7, row014/url:col4/1364133382268/Put/vlen=6} keyvalues={row015/data:col5/1364133382268/Put/vlen=7, row015/url:col5/1364133382268/Put/vlen=6} keyvalues={row016/data:col6/1364133382268/Put/vlen=7, row016/url:col6/1364133382268/Put/vlen=6} keyvalues={row017/data:col7/1364133382268/Put/vlen=7, row017/url:col7/1364133382268/Put/vlen=6} keyvalues={row018/data:col8/1364133382268/Put/vlen=7, row018/url:col8/1364133382268/Put/vlen=6} keyvalues={row019/data:col9/1364133382268/Put/vlen=7, row019/url:col9/1364133382268/Put/vlen=6}
複製代碼oop