| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.client; |
| |
| import java.io.IOException; |
| import org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.HBaseTestingUtility; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.testclassification.MediumTests; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.junit.After; |
| import org.junit.AfterClass; |
| import org.junit.Assert; |
| import org.junit.BeforeClass; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Category(MediumTests.class) |
| public class TestSmallReversedScanner { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestSmallReversedScanner.class); |
| |
| public static final Logger LOG = LoggerFactory.getLogger(TestSmallReversedScanner.class); |
| private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility(); |
| |
| private static final TableName TABLE_NAME = TableName.valueOf("testReversedSmall"); |
| private static final byte[] COLUMN_FAMILY = Bytes.toBytes("columnFamily"); |
| |
| private static Table htable = null; |
| |
| @BeforeClass |
| public static void setUpBeforeClass() throws Exception { |
| TEST_UTIL.startMiniCluster(1); |
| |
| // create a table with 4 region: (-oo, b),[b,c),[c,d),[d,+oo) |
| byte[] bytes = Bytes.toBytes("bcd"); |
| byte[][] splitKeys = new byte[bytes.length][]; |
| |
| for (int i = 0; i < bytes.length; i++) { |
| splitKeys[i] = new byte[] { bytes[i] }; |
| } |
| htable = TEST_UTIL.createTable(TABLE_NAME, COLUMN_FAMILY, splitKeys); |
| } |
| |
| @AfterClass |
| public static void tearDownAfterClass() throws Exception { |
| TEST_UTIL.shutdownMiniCluster(); |
| } |
| |
| @After |
| public void tearDown() throws IOException { |
| TEST_UTIL.truncateTable(TABLE_NAME); |
| } |
| |
| /** |
| * all rowKeys are fit in the last region. |
| * @throws IOException |
| */ |
| @Test |
| public void testSmallReversedScan01() throws IOException { |
| String[][] keysCases = new String[][] { |
| { "d0", "d1", "d2", "d3" }, // all rowKeys fit in the last region. |
| { "a0", "a1", "a2", "a3" }, // all rowKeys fit in the first region. |
| { "a0", "b1", "c2", "d3" }, // each region with a rowKey |
| }; |
| |
| for (int caseIndex = 0; caseIndex < keysCases.length; caseIndex++) { |
| testSmallReversedScanInternal(keysCases[caseIndex]); |
| TEST_UTIL.truncateTable(TABLE_NAME); |
| } |
| } |
| |
| private void testSmallReversedScanInternal(String[] inputRowKeys) throws IOException { |
| int rowCount = inputRowKeys.length; |
| |
| for (int i = 0; i < rowCount; i++) { |
| Put put = new Put(Bytes.toBytes(inputRowKeys[i])); |
| put.addColumn(COLUMN_FAMILY, null, Bytes.toBytes(i)); |
| htable.put(put); |
| } |
| |
| Scan scan = new Scan(); |
| scan.setReversed(true); |
| scan.setSmall(true); |
| |
| ResultScanner scanner = htable.getScanner(scan); |
| Result r; |
| int value = rowCount; |
| while ((r = scanner.next()) != null) { |
| Assert.assertArrayEquals(r.getValue(COLUMN_FAMILY, null), Bytes.toBytes(--value)); |
| Assert.assertArrayEquals(r.getRow(), Bytes.toBytes(inputRowKeys[value])); |
| } |
| |
| Assert.assertEquals(0, value); |
| } |
| |
| /** |
| * Corner case: |
| * HBase has 4 regions, (-oo,b),[b,c),[c,d),[d,+oo), and only rowKey with byte[]={0x00} locate in region (-oo,b) . |
| * test whether reversed small scanner will return infinity results with RowKey={0x00}. |
| * @throws IOException |
| */ |
| @Test |
| public void testSmallReversedScan02() throws IOException { |
| Put put = new Put(new byte[] { (char) 0x00 }); |
| put.addColumn(COLUMN_FAMILY, null, Bytes.toBytes(0)); |
| htable.put(put); |
| |
| Scan scan = new Scan(); |
| scan.setCaching(1); |
| scan.setReversed(true); |
| scan.setSmall(true); |
| |
| ResultScanner scanner = htable.getScanner(scan); |
| Result r; |
| int count = 1; |
| while ((r = scanner.next()) != null) { |
| Assert.assertArrayEquals(r.getValue(COLUMN_FAMILY, null), Bytes.toBytes(0)); |
| Assert.assertArrayEquals(r.getRow(), new byte[] { (char) 0x00 }); |
| Assert.assertTrue(--count >= 0); |
| } |
| Assert.assertEquals(0, count); |
| } |
| } |