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*
* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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* See the License for the specific language governing permissions and
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package org.apache.hadoop.hbase.io.hfile;
import static org.junit.Assert.assertEquals;
import org.apache.hadoop.hbase.io.hfile.CombinedBlockCache.CombinedCacheStats;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category({SmallTests.class})
public class TestCombinedBlockCache {
@Test
public void testCombinedCacheStats() {
CacheStats lruCacheStats = new CacheStats("lruCacheStats", 2);
CacheStats bucketCacheStats = new CacheStats("bucketCacheStats", 2);
CombinedCacheStats stats =
new CombinedCacheStats(lruCacheStats, bucketCacheStats);
double delta = 0.01;
// period 1:
// lru cache: 1 hit caching, 1 miss caching
// bucket cache: 2 hit non-caching,1 miss non-caching/primary,1 fail insert
lruCacheStats.hit(true, true, BlockType.DATA);
lruCacheStats.miss(true, false, BlockType.DATA);
bucketCacheStats.hit(false,true, BlockType.DATA);
bucketCacheStats.hit(false,true, BlockType.DATA);
bucketCacheStats.miss(false, true, BlockType.DATA);
assertEquals(5, stats.getRequestCount());
assertEquals(2, stats.getRequestCachingCount());
assertEquals(2, stats.getMissCount());
assertEquals(1, stats.getPrimaryMissCount());
assertEquals(1, stats.getMissCachingCount());
assertEquals(3, stats.getHitCount());
assertEquals(3, stats.getPrimaryHitCount());
assertEquals(1, stats.getHitCachingCount());
assertEquals(0.6, stats.getHitRatio(), delta);
assertEquals(0.5, stats.getHitCachingRatio(), delta);
assertEquals(0.4, stats.getMissRatio(), delta);
assertEquals(0.5, stats.getMissCachingRatio(), delta);
// lru cache: 2 evicted, 1 evict
// bucket cache: 1 evict
lruCacheStats.evicted(1000, true);
lruCacheStats.evicted(1000, false);
lruCacheStats.evict();
bucketCacheStats.evict();
assertEquals(2, stats.getEvictionCount());
assertEquals(2, stats.getEvictedCount());
assertEquals(1, stats.getPrimaryEvictedCount());
assertEquals(1.0, stats.evictedPerEviction(), delta);
// lru cache: 1 fail insert
lruCacheStats.failInsert();
assertEquals(1, stats.getFailedInserts());
// rollMetricsPeriod
stats.rollMetricsPeriod();
assertEquals(3, stats.getSumHitCountsPastNPeriods());
assertEquals(5, stats.getSumRequestCountsPastNPeriods());
assertEquals(1, stats.getSumHitCachingCountsPastNPeriods());
assertEquals(2, stats.getSumRequestCachingCountsPastNPeriods());
assertEquals(0.6, stats.getHitRatioPastNPeriods(), delta);
assertEquals(0.5, stats.getHitCachingRatioPastNPeriods(), delta);
// period 2:
// lru cache: 3 hit caching
lruCacheStats.hit(true, true, BlockType.DATA);
lruCacheStats.hit(true, true, BlockType.DATA);
lruCacheStats.hit(true, true, BlockType.DATA);
stats.rollMetricsPeriod();
assertEquals(6, stats.getSumHitCountsPastNPeriods());
assertEquals(8, stats.getSumRequestCountsPastNPeriods());
assertEquals(4, stats.getSumHitCachingCountsPastNPeriods());
assertEquals(5, stats.getSumRequestCachingCountsPastNPeriods());
assertEquals(0.75, stats.getHitRatioPastNPeriods(), delta);
assertEquals(0.8, stats.getHitCachingRatioPastNPeriods(), delta);
}
}