hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestBlocksScanned.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 import java.util.ArrayList;
  20 import java.util.List;
  21
  22 import org.apache.hadoop.hbase.Cell;
  23 import org.apache.hadoop.hbase.HBaseTestCase;
  24 import org.apache.hadoop.hbase.HBaseTestingUtility;
  25 import org.apache.hadoop.hbase.HColumnDescriptor;
  26 import org.apache.hadoop.hbase.HTableDescriptor;
  27 import org.apache.hadoop.hbase.KeyValueUtil;
  28 import org.apache.hadoop.hbase.TableName;
  29 import org.apache.hadoop.hbase.client.Scan;
  30 import org.apache.hadoop.hbase.io.compress.Compression;
  31 import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
  32 import org.apache.hadoop.hbase.io.hfile.CacheConfig;
  33 import org.apache.hadoop.hbase.io.hfile.CacheStats;
  34 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
  35 import org.apache.hadoop.hbase.testclassification.SmallTests;
  36 import org.apache.hadoop.hbase.util.Bytes;
  37 import org.junit.Assert;
  38 import org.junit.Before;
  39 import org.junit.Test;
  40 import org.junit.experimental.categories.Category;
  41
  42 @SuppressWarnings("deprecation")
  43 @Category({RegionServerTests.class, SmallTests.class})
  44 public class TestBlocksScanned extends HBaseTestCase {
  45   private static byte [] FAMILY = Bytes.toBytes("family");
  46   private static byte [] COL = Bytes.toBytes("col");
  47   private static byte [] START_KEY = Bytes.toBytes("aaa");
  48   private static byte [] END_KEY = Bytes.toBytes("zzz");
  49   private static int BLOCK_SIZE = 70;
  50
  51   private static HBaseTestingUtility TEST_UTIL = null;
  52
  53   @Override
  54   @Before
  55   public void setUp() throws Exception {
  56     super.setUp();
  57
  58     TEST_UTIL = new HBaseTestingUtility();
  59   }
  60
  61   @Test
  62   public void testBlocksScanned() throws Exception {
  63     byte [] tableName = Bytes.toBytes("TestBlocksScanned");
  64     HTableDescriptor table = new HTableDescriptor(TableName.valueOf(tableName));
  65
  66     table.addFamily(
  67         new HColumnDescriptor(FAMILY)
  68         .setMaxVersions(10)
  69         .setBlockCacheEnabled(true)
  70         .setBlocksize(BLOCK_SIZE)
  71         .setCompressionType(Compression.Algorithm.NONE)
  72         );
  73     _testBlocksScanned(table);
  74   }
  75
  76   @Test
  77   public void testBlocksScannedWithEncoding() throws Exception {
  78     byte [] tableName = Bytes.toBytes("TestBlocksScannedWithEncoding");
  79     HTableDescriptor table = new HTableDescriptor(TableName.valueOf(tableName));
  80
  81     table.addFamily(
  82         new HColumnDescriptor(FAMILY)
  83         .setMaxVersions(10)
  84         .setBlockCacheEnabled(true)
  85         .setDataBlockEncoding(DataBlockEncoding.FAST_DIFF)
  86         .setBlocksize(BLOCK_SIZE)
  87         .setCompressionType(Compression.Algorithm.NONE)
  88         );
  89     _testBlocksScanned(table);
  90   }
  91
  92   private void _testBlocksScanned(HTableDescriptor table) throws Exception {
  93     HRegion r = createNewHRegion(table, START_KEY, END_KEY, TEST_UTIL.getConfiguration());
  94     addContent(r, FAMILY, COL);
  95     r.flush(true);
  96
  97     CacheStats stats = new CacheConfig(TEST_UTIL.getConfiguration()).getBlockCache().getStats();
  98     long before = stats.getHitCount() + stats.getMissCount();
  99     // Do simple test of getting one row only first.
 100     Scan scan = new Scan().withStartRow(Bytes.toBytes("aaa")).withStopRow(Bytes.toBytes("aaz"))
 101         .setReadType(Scan.ReadType.PREAD);
 102     scan.addColumn(FAMILY, COL);
 103     scan.setMaxVersions(1);
 104
 105     InternalScanner s = r.getScanner(scan);
 106     List<Cell> results = new ArrayList<>();
 107     while (s.next(results));
 108     s.close();
 109
 110     int expectResultSize = 'z' - 'a';
 111     assertEquals(expectResultSize, results.size());
 112
 113     int kvPerBlock = (int) Math.ceil(BLOCK_SIZE /
 114         (double) KeyValueUtil.ensureKeyValue(results.get(0)).getLength());
 115     Assert.assertEquals(2, kvPerBlock);
 116
 117     long expectDataBlockRead = (long) Math.ceil(expectResultSize / (double) kvPerBlock);
 118     long expectIndexBlockRead = expectDataBlockRead;
 119
 120     assertEquals(expectIndexBlockRead+expectDataBlockRead, stats.getHitCount() + stats.getMissCount() - before);
 121   }
 122 }