001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.io.hfile;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021
022import java.util.concurrent.TimeUnit;
023import org.apache.hadoop.hbase.testclassification.MiscTests;
024import org.apache.hadoop.hbase.testclassification.SmallTests;
025import org.junit.jupiter.api.Tag;
026import org.junit.jupiter.api.Test;
027
028@Tag(MiscTests.TAG)
029@Tag(SmallTests.TAG)
030public class TestCacheStats {
031
032  @Test
033  public void testPeriodicMetrics() throws Exception {
034    CacheStats cacheStats = new CacheStats("test", 5, 1, TimeUnit.SECONDS);
035    cacheStats.hit(false, false, BlockType.DATA);
036    cacheStats.hit(false, false, BlockType.DATA);
037    cacheStats.hit(false, false, BlockType.DATA);
038    cacheStats.miss(false, false, BlockType.DATA);
039    // first period should have a 75% hit, 25% miss
040    Thread.sleep(1001);
041    cacheStats.hit(false, false, BlockType.DATA);
042    cacheStats.hit(false, false, BlockType.DATA);
043    cacheStats.miss(false, false, BlockType.DATA);
044    cacheStats.miss(false, false, BlockType.DATA);
045    Thread.sleep(1001);
046    cacheStats.hit(false, false, BlockType.DATA);
047    cacheStats.miss(false, false, BlockType.DATA);
048    cacheStats.miss(false, false, BlockType.DATA);
049    cacheStats.miss(false, false, BlockType.DATA);
050    Thread.sleep(1001);
051    cacheStats.hit(false, false, BlockType.DATA);
052    cacheStats.hit(false, false, BlockType.DATA);
053    cacheStats.hit(false, false, BlockType.DATA);
054    cacheStats.hit(false, false, BlockType.DATA);
055    Thread.sleep(1001);
056    cacheStats.miss(false, false, BlockType.DATA);
057    cacheStats.miss(false, false, BlockType.DATA);
058    cacheStats.miss(false, false, BlockType.DATA);
059    cacheStats.miss(false, false, BlockType.DATA);
060    Thread.sleep(1001);
061    cacheStats.getMetricsRollerScheduler().shutdownNow();
062    long[] hitCounts = cacheStats.getHitCounts();
063    long[] requestCounts = cacheStats.getRequestCounts();
064    assertEquals(5, hitCounts.length);
065    assertEquals(5, requestCounts.length);
066    assertEquals(3, hitCounts[0]);
067    assertEquals(2, hitCounts[1]);
068    assertEquals(1, hitCounts[2]);
069    assertEquals(4, hitCounts[3]);
070    assertEquals(0, hitCounts[4]);
071    assertEquals(10, cacheStats.getHitCount());
072    assertEquals(0.5, cacheStats.getHitRatioPastNPeriods(), 0.01);
073  }
074}