hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestWideScanner.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 package org.apache.hadoop.hbase.regionserver;
  19
  20 import static org.junit.Assert.assertEquals;
  21 import static org.junit.Assert.assertTrue;
  22
  23 import java.io.IOException;
  24 import java.util.ArrayList;
  25 import java.util.Collections;
  26 import java.util.Iterator;
  27 import java.util.List;
  28 import java.util.concurrent.ThreadLocalRandom;
  29 import org.apache.hadoop.fs.Path;
  30 import org.apache.hadoop.hbase.Cell;
  31 import org.apache.hadoop.hbase.CellUtil;
  32 import org.apache.hadoop.hbase.HBaseClassTestRule;
  33 import org.apache.hadoop.hbase.HBaseTestingUtil;
  34 import org.apache.hadoop.hbase.TableName;
  35 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
  36 import org.apache.hadoop.hbase.client.Durability;
  37 import org.apache.hadoop.hbase.client.Put;
  38 import org.apache.hadoop.hbase.client.RegionInfo;
  39 import org.apache.hadoop.hbase.client.RegionInfoBuilder;
  40 import org.apache.hadoop.hbase.client.Scan;
  41 import org.apache.hadoop.hbase.client.TableDescriptor;
  42 import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
  43 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
  44 import org.apache.hadoop.hbase.testclassification.SmallTests;
  45 import org.apache.hadoop.hbase.util.Bytes;
  46 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
  47 import org.junit.AfterClass;
  48 import org.junit.BeforeClass;
  49 import org.junit.ClassRule;
  50 import org.junit.Test;
  51 import org.junit.experimental.categories.Category;
  52 import org.slf4j.Logger;
  53 import org.slf4j.LoggerFactory;
  54
  55 @Category({ RegionServerTests.class, SmallTests.class })
  56 public class TestWideScanner {
  57
  58   @ClassRule
  59   public static final HBaseClassTestRule CLASS_RULE =
  60     HBaseClassTestRule.forClass(TestWideScanner.class);
  61
  62   private static final HBaseTestingUtil UTIL = new HBaseTestingUtil();
  63
  64   private static final Logger LOG = LoggerFactory.getLogger(TestWideScanner.class);
  65
  66   private static final byte[] A = Bytes.toBytes("A");
  67   private static final byte[] B = Bytes.toBytes("B");
  68   private static final byte[] C = Bytes.toBytes("C");
  69   private static byte[][] COLUMNS = { A, B, C };
  70
  71   private static final TableDescriptor TESTTABLEDESC;
  72   static {
  73     TableDescriptorBuilder builder =
  74       TableDescriptorBuilder.newBuilder(TableName.valueOf("testwidescan"));
  75     for (byte[] cfName : new byte[][] { A, B, C }) {
  76       // Keep versions to help debugging.
  77       builder.setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(cfName).setMaxVersions(100)
  78         .setBlocksize(8 * 1024).build());
  79     }
  80     TESTTABLEDESC = builder.build();
  81   }
  82
  83   /** HRegionInfo for root region */
  84   private static HRegion REGION;
  85
  86   @BeforeClass
  87   public static void setUp() throws IOException {
  88     Path testDir = UTIL.getDataTestDir();
  89     RegionInfo hri = RegionInfoBuilder.newBuilder(TESTTABLEDESC.getTableName()).build();
  90     REGION =
  91       HBaseTestingUtil.createRegionAndWAL(hri, testDir, UTIL.getConfiguration(), TESTTABLEDESC);
  92   }
  93
  94   @AfterClass
  95   public static void tearDown() throws IOException {
  96     if (REGION != null) {
  97       HBaseTestingUtil.closeRegionAndWAL(REGION);
  98       REGION = null;
  99     }
 100     UTIL.cleanupTestDir();
 101   }
 102
 103   private int addWideContent(HRegion region) throws IOException {
 104     int count = 0;
 105     for (char c = 'a'; c <= 'c'; c++) {
 106       byte[] row = Bytes.toBytes("ab" + c);
 107       int i, j;
 108       long ts = EnvironmentEdgeManager.currentTime();
 109       for (i = 0; i < 100; i++) {
 110         byte[] b = Bytes.toBytes(String.format("%10d", i));
 111         for (j = 0; j < 100; j++) {
 112           Put put = new Put(row);
 113           put.setDurability(Durability.SKIP_WAL);
 114           long ts1 = ++ts;
 115           put.addColumn(COLUMNS[ThreadLocalRandom.current().nextInt(COLUMNS.length)], b, ts1, b);
 116           region.put(put);
 117           count++;
 118         }
 119       }
 120     }
 121     return count;
 122   }
 123
 124   @Test
 125   public void testWideScanBatching() throws IOException {
 126     final int batch = 256;
 127     int inserted = addWideContent(REGION);
 128     List<Cell> results = new ArrayList<>();
 129     Scan scan = new Scan();
 130     scan.addFamily(A);
 131     scan.addFamily(B);
 132     scan.addFamily(C);
 133     scan.readVersions(100);
 134     scan.setBatch(batch);
 135     try (InternalScanner s = REGION.getScanner(scan)) {
 136       int total = 0;
 137       int i = 0;
 138       boolean more;
 139       do {
 140         more = s.next(results);
 141         i++;
 142         LOG.info("iteration #" + i + ", results.size=" + results.size());
 143
 144         // assert that the result set is no larger
 145         assertTrue(results.size() <= batch);
 146
 147         total += results.size();
 148
 149         if (results.size() > 0) {
 150           // assert that all results are from the same row
 151           byte[] row = CellUtil.cloneRow(results.get(0));
 152           for (Cell kv : results) {
 153             assertTrue(Bytes.equals(row, CellUtil.cloneRow(kv)));
 154           }
 155         }
 156
 157         results.clear();
 158
 159         // trigger ChangedReadersObservers
 160         Iterator<KeyValueScanner> scanners =
 161           ((RegionScannerImpl) s).storeHeap.getHeap().iterator();
 162         while (scanners.hasNext()) {
 163           StoreScanner ss = (StoreScanner) scanners.next();
 164           ss.updateReaders(Collections.emptyList(), Collections.emptyList());
 165         }
 166       } while (more);
 167
 168       // assert that the scanner returned all values
 169       LOG.info("inserted " + inserted + ", scanned " + total);
 170       assertEquals(total, inserted);
 171     }
 172   }
 173 }