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HBASE-15560 TinyLFU-based BlockCache (Ben Manes)

This commit is contained in:
tedyu 2016-10-04 05:15:51 -07:00
parent 2508edcd4e
commit 9e0c2562a9
13 changed files with 897 additions and 79 deletions
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5
hbase-common/src/main/resources/hbase-default.xml
View File

@ -806,6 +806,11 @@ possible configurations would overwhelm and obscure the important.
<description>
The default thread pool size if parallel-seeking feature enabled.</description>
</property>
<property>
<name>hfile.block.cache.policy</name>
<value>LRU</value>
<description>The eviction policy for the L1 block cache (LRU or TinyLFU).</description>
</property>
<property>
<name>hfile.block.cache.size</name>
<value>0.4</value>

14
hbase-resource-bundle/src/main/resources/supplemental-models.xml
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@ -150,6 +150,20 @@ under the License.
</licenses>
</project>
</supplement>
<supplement>
<project>
<groupId>com.github.ben-manes.caffeine</groupId>
<artifactId>caffeine</artifactId>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
</project>
</supplement>
<supplement>
<project>
<groupId>com.lmax</groupId>

4
hbase-server/pom.xml
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@ -434,6 +434,10 @@
<artifactId>findbugs-annotations</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.github.ben-manes.caffeine</groupId>
<artifactId>caffeine</artifactId>
</dependency>
<dependency>
<groupId>io.dropwizard.metrics</groupId>
<artifactId>metrics-core</artifactId>

85
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/CacheConfig.java
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@ -22,13 +22,14 @@ import static org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_SIZE_KEY;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.concurrent.ForkJoinPool;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.hfile.BlockType.BlockCategory;
import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
import org.apache.hadoop.hbase.util.ReflectionUtils;
@ -43,6 +44,12 @@ import com.google.common.annotations.VisibleForTesting;
public class CacheConfig {
private static final Log LOG = LogFactory.getLog(CacheConfig.class.getName());
/**
* Configuration key to cache block policy (Lru, TinyLfu).
*/
public static final String HFILE_BLOCK_CACHE_POLICY_KEY = "hfile.block.cache.policy";
public static final String HFILE_BLOCK_CACHE_POLICY_DEFAULT = "LRU";
/**
* Configuration key to cache data blocks on read. Bloom blocks and index blocks are always be
* cached if the block cache is enabled.
@ -154,6 +161,7 @@ public class CacheConfig {
memcached("org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache");
// TODO(eclark): Consider more. Redis, etc.
Class<? extends BlockCache> clazz;
@SuppressWarnings("unchecked")
ExternalBlockCaches(String clazzName) {
try {
clazz = (Class<? extends BlockCache>) Class.forName(clazzName);
@ -449,7 +457,9 @@ public class CacheConfig {
* @return true if this {@link BlockCategory} should be compressed in blockcache, false otherwise
*/
public boolean shouldCacheCompressed(BlockCategory category) {
if (!isBlockCacheEnabled()) return false;
if (!isBlockCacheEnabled()) {
return false;
}
switch (category) {
case DATA:
return this.cacheDataOnRead && this.cacheDataCompressed;
@ -531,13 +541,13 @@ public class CacheConfig {
// Clear this if in tests you'd make more than one block cache instance.
@VisibleForTesting
static BlockCache GLOBAL_BLOCK_CACHE_INSTANCE;
private static LruBlockCache GLOBAL_L1_CACHE_INSTANCE;
private static FirstLevelBlockCache GLOBAL_L1_CACHE_INSTANCE;
/** Boolean whether we have disabled the block cache entirely. */
@VisibleForTesting
static boolean blockCacheDisabled = false;
static long getLruCacheSize(final Configuration conf, final long xmx) {
static long getFirstLevelCacheSize(final Configuration conf, final long xmx) {
float cachePercentage = conf.getFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY,
HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
if (cachePercentage <= 0.0001f) {
@ -555,26 +565,37 @@ public class CacheConfig {
/**
* @param c Configuration to use.
* @return An L1 instance. Currently an instance of LruBlockCache.
* @return An L1 instance
*/
public static LruBlockCache getL1(final Configuration c) {
return getL1(c, ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getMax());
public static FirstLevelBlockCache getL1(final Configuration c) {
long xmx = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getMax();
long l1CacheSize = getFirstLevelCacheSize(c, xmx);
return getL1(l1CacheSize, c);
}
/**
* @param c Configuration to use.
* @param xmx Max heap memory
* @return An L1 instance. Currently an instance of LruBlockCache.
* @return An L1 instance.
*/
private synchronized static LruBlockCache getL1(final Configuration c, final long xmx) {
private synchronized static FirstLevelBlockCache getL1(long cacheSize, Configuration c) {
if (GLOBAL_L1_CACHE_INSTANCE != null) return GLOBAL_L1_CACHE_INSTANCE;
if (blockCacheDisabled) return null;
long lruCacheSize = getLruCacheSize(c, xmx);
if (lruCacheSize < 0) return null;
if (cacheSize < 0) return null;
String policy = c.get(HFILE_BLOCK_CACHE_POLICY_KEY, HFILE_BLOCK_CACHE_POLICY_DEFAULT);
int blockSize = c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);
LOG.info("Allocating LruBlockCache size=" +
StringUtils.byteDesc(lruCacheSize) + ", blockSize=" + StringUtils.byteDesc(blockSize));
GLOBAL_L1_CACHE_INSTANCE = new LruBlockCache(lruCacheSize, blockSize, true, c);
LOG.info("Allocating BlockCache size=" +
StringUtils.byteDesc(cacheSize) + ", blockSize=" + StringUtils.byteDesc(blockSize));
if (policy.equalsIgnoreCase("LRU")) {
GLOBAL_L1_CACHE_INSTANCE = new LruBlockCache(cacheSize, blockSize, true, c);
} else if (policy.equalsIgnoreCase("TinyLFU")) {
GLOBAL_L1_CACHE_INSTANCE = new TinyLfuBlockCache(
cacheSize, blockSize, ForkJoinPool.commonPool(), c);
} else {
throw new IllegalArgumentException("Unknown policy: " + policy);
}
return GLOBAL_L1_CACHE_INSTANCE;
}
@ -601,7 +622,7 @@ public class CacheConfig {
}
private static BlockCache getExternalBlockcache(Configuration c) {
Class klass = null;
Class<?> klass = null;
// Get the class, from the config. s
try {
@ -629,7 +650,9 @@ public class CacheConfig {
private static BlockCache getBucketCache(Configuration c, long xmx) {
// Check for L2. ioengine name must be non-null.
String bucketCacheIOEngineName = c.get(BUCKET_CACHE_IOENGINE_KEY, null);
if (bucketCacheIOEngineName == null || bucketCacheIOEngineName.length() <= 0) return null;
if (bucketCacheIOEngineName == null || bucketCacheIOEngineName.length() <= 0) {
return null;
}
int blockSize = c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);
float bucketCachePercentage = c.getFloat(BUCKET_CACHE_SIZE_KEY, 0F);
@ -679,29 +702,37 @@ public class CacheConfig {
* @return The block cache or <code>null</code>.
*/
public static synchronized BlockCache instantiateBlockCache(Configuration conf) {
if (GLOBAL_BLOCK_CACHE_INSTANCE != null) return GLOBAL_BLOCK_CACHE_INSTANCE;
if (blockCacheDisabled) return null;
if (GLOBAL_BLOCK_CACHE_INSTANCE != null) {
return GLOBAL_BLOCK_CACHE_INSTANCE;
}
if (blockCacheDisabled) {
return null;
}
// blockCacheDisabled is set as a side-effect of getFirstLevelCacheSize()
// so check it again after the call
long xmx = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getMax();
LruBlockCache l1 = getL1(conf, xmx);
// blockCacheDisabled is set as a side-effect of getL1(), so check it again after the call.
if (blockCacheDisabled) return null;
long l1CacheSize = getFirstLevelCacheSize(conf, xmx);
if (blockCacheDisabled) {
return null;
}
BlockCache l2 = getL2(conf, xmx);
FirstLevelBlockCache l1 = getL1(l1CacheSize, conf);
if (l2 == null) {
GLOBAL_BLOCK_CACHE_INSTANCE = l1;
} else {
boolean useExternal = conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);
boolean combinedWithLru = conf.getBoolean(BUCKET_CACHE_COMBINED_KEY,
boolean combinedWithL1 = conf.getBoolean(BUCKET_CACHE_COMBINED_KEY,
DEFAULT_BUCKET_CACHE_COMBINED);
if (useExternal) {
GLOBAL_BLOCK_CACHE_INSTANCE = new InclusiveCombinedBlockCache(l1, l2);
} else {
if (combinedWithLru) {
if (combinedWithL1) {
GLOBAL_BLOCK_CACHE_INSTANCE = new CombinedBlockCache(l1, l2);
} else {
// L1 and L2 are not 'combined'. They are connected via the LruBlockCache victimhandler
// mechanism. It is a little ugly but works according to the following: when the
// background eviction thread runs, blocks evicted from L1 will go to L2 AND when we get
// a block from the L1 cache, if not in L1, we will search L2.
// L1 and L2 are not 'combined'. They are connected via the FirstLevelBlockCache
// victimhandler mechanism. It is a little ugly but works according to the following:
// when the background eviction thread runs, blocks evicted from L1 will go to L2 AND when
// we get a block from the L1 cache, if not in L1, we will search L2.
GLOBAL_BLOCK_CACHE_INSTANCE = l1;
}
}

40
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/CombinedBlockCache.java
View File

@ -30,24 +30,24 @@ import com.google.common.annotations.VisibleForTesting;
/**
* CombinedBlockCache is an abstraction layer that combines
* {@link LruBlockCache} and {@link BucketCache}. The smaller lruCache is used
* {@link FirstLevelBlockCache} and {@link BucketCache}. The smaller lruCache is used
* to cache bloom blocks and index blocks. The larger l2Cache is used to
* cache data blocks. {@link #getBlock(BlockCacheKey, boolean, boolean, boolean)} reads
* first from the smaller lruCache before looking for the block in the l2Cache. Blocks evicted
* from lruCache are put into the bucket cache.
* first from the smaller l1Cache before looking for the block in the l2Cache. Blocks evicted
* from l1Cache are put into the bucket cache.
* Metrics are the combined size and hits and misses of both caches.
*
*/
@InterfaceAudience.Private
public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
protected final LruBlockCache lruCache;
protected final FirstLevelBlockCache l1Cache;
protected final BlockCache l2Cache;
protected final CombinedCacheStats combinedCacheStats;
public CombinedBlockCache(LruBlockCache lruCache, BlockCache l2Cache) {
this.lruCache = lruCache;
public CombinedBlockCache(FirstLevelBlockCache l1Cache, BlockCache l2Cache) {
this.l1Cache = l1Cache;
this.l2Cache = l2Cache;
this.combinedCacheStats = new CombinedCacheStats(lruCache.getStats(),
this.combinedCacheStats = new CombinedCacheStats(l1Cache.getStats(),
l2Cache.getStats());
}
@ -57,7 +57,7 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
if (l2Cache instanceof HeapSize) {
l2size = ((HeapSize) l2Cache).heapSize();
}
return lruCache.heapSize() + l2size;
return l1Cache.heapSize() + l2size;
}
@Override
@ -65,7 +65,7 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
final boolean cacheDataInL1) {
boolean metaBlock = buf.getBlockType().getCategory() != BlockCategory.DATA;
if (metaBlock || cacheDataInL1) {
lruCache.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
l1Cache.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
} else {
l2Cache.cacheBlock(cacheKey, buf, inMemory, false);
}
@ -81,19 +81,19 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
boolean repeat, boolean updateCacheMetrics) {
// TODO: is there a hole here, or just awkwardness since in the lruCache getBlock
// we end up calling l2Cache.getBlock.
return lruCache.containsBlock(cacheKey)?
lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics):
return l1Cache.containsBlock(cacheKey)?
l1Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics):
l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
}
@Override
public boolean evictBlock(BlockCacheKey cacheKey) {
return lruCache.evictBlock(cacheKey) || l2Cache.evictBlock(cacheKey);
return l1Cache.evictBlock(cacheKey) || l2Cache.evictBlock(cacheKey);
}
@Override
public int evictBlocksByHfileName(String hfileName) {
return lruCache.evictBlocksByHfileName(hfileName)
return l1Cache.evictBlocksByHfileName(hfileName)
+ l2Cache.evictBlocksByHfileName(hfileName);
}
@ -104,28 +104,28 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
@Override
public void shutdown() {
lruCache.shutdown();
l1Cache.shutdown();
l2Cache.shutdown();
}
@Override
public long size() {
return lruCache.size() + l2Cache.size();
return l1Cache.size() + l2Cache.size();
}
@Override
public long getFreeSize() {
return lruCache.getFreeSize() + l2Cache.getFreeSize();
return l1Cache.getFreeSize() + l2Cache.getFreeSize();
}
@Override
public long getCurrentSize() {
return lruCache.getCurrentSize() + l2Cache.getCurrentSize();
return l1Cache.getCurrentSize() + l2Cache.getCurrentSize();
}
@Override
public long getBlockCount() {
return lruCache.getBlockCount() + l2Cache.getBlockCount();
return l1Cache.getBlockCount() + l2Cache.getBlockCount();
}
public static class CombinedCacheStats extends CacheStats {
@ -348,12 +348,12 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
@Override
public BlockCache[] getBlockCaches() {
return new BlockCache [] {this.lruCache, this.l2Cache};
return new BlockCache [] {this.l1Cache, this.l2Cache};
}
@Override
public void setMaxSize(long size) {
this.lruCache.setMaxSize(size);
this.l1Cache.setMaxSize(size);
}
@Override

45
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.java Normal file
View File

@ -0,0 +1,45 @@
/**
* 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.io.hfile;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.HeapSize;
/**
* In-memory BlockCache that may be backed by secondary layer(s).
*/
@InterfaceAudience.Private
public interface FirstLevelBlockCache extends ResizableBlockCache, HeapSize {
/**
* Whether the cache contains the block with specified cacheKey
*
* @param cacheKey
* @return true if it contains the block
*/
boolean containsBlock(BlockCacheKey cacheKey);
/**
* Specifies the secondary cache. An entry that is evicted from this cache due to a size
* constraint will be inserted into the victim cache.
*
* @param victimCache the second level cache
* @throws IllegalArgumentException if the victim cache had already been set
*/
void setVictimCache(BlockCache victimCache);
}

6
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/InclusiveCombinedBlockCache.java
View File

@ -24,7 +24,7 @@ import org.apache.hadoop.hbase.classification.InterfaceAudience;
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
public class InclusiveCombinedBlockCache extends CombinedBlockCache implements BlockCache {
public InclusiveCombinedBlockCache(LruBlockCache l1, BlockCache l2) {
public InclusiveCombinedBlockCache(FirstLevelBlockCache l1, BlockCache l2) {
super(l1,l2);
}
@ -34,7 +34,7 @@ public class InclusiveCombinedBlockCache extends CombinedBlockCache implements B
// On all external cache set ups the lru should have the l2 cache set as the victimHandler
// Because of that all requests that miss inside of the lru block cache will be
// tried in the l2 block cache.
return lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
return l1Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
}
/**
@ -50,7 +50,7 @@ public class InclusiveCombinedBlockCache extends CombinedBlockCache implements B
final boolean cacheDataInL1) {
// This is the inclusive part of the combined block cache.
// Every block is placed into both block caches.
lruCache.cacheBlock(cacheKey, buf, inMemory, true);
l1Cache.cacheBlock(cacheKey, buf, inMemory, true);
// This assumes that insertion into the L2 block cache is either async or very fast.
l2Cache.cacheBlock(cacheKey, buf, inMemory, true);

30
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java
View File

@ -18,6 +18,8 @@
*/
package org.apache.hadoop.hbase.io.hfile;
import static java.util.Objects.requireNonNull;
import java.lang.ref.WeakReference;
import java.nio.ByteBuffer;
import java.util.EnumMap;
@ -95,7 +97,7 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
*/
@InterfaceAudience.Private
@JsonIgnoreProperties({"encodingCountsForTest"})
public class LruBlockCache implements ResizableBlockCache, HeapSize {
public class LruBlockCache implements FirstLevelBlockCache {
private static final Log LOG = LogFactory.getLog(LruBlockCache.class);
@ -238,8 +240,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
DEFAULT_MEMORY_FACTOR,
DEFAULT_HARD_CAPACITY_LIMIT_FACTOR,
false,
DEFAULT_MAX_BLOCK_SIZE
);
DEFAULT_MAX_BLOCK_SIZE);
}
public LruBlockCache(long maxSize, long blockSize, boolean evictionThread, Configuration conf) {
@ -254,8 +255,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
conf.getFloat(LRU_MEMORY_PERCENTAGE_CONFIG_NAME, DEFAULT_MEMORY_FACTOR),
conf.getFloat(LRU_HARD_CAPACITY_LIMIT_FACTOR_CONFIG_NAME, DEFAULT_HARD_CAPACITY_LIMIT_FACTOR),
conf.getBoolean(LRU_IN_MEMORY_FORCE_MODE_CONFIG_NAME, DEFAULT_IN_MEMORY_FORCE_MODE),
conf.getLong(LRU_MAX_BLOCK_SIZE, DEFAULT_MAX_BLOCK_SIZE)
);
conf.getLong(LRU_MAX_BLOCK_SIZE, DEFAULT_MAX_BLOCK_SIZE));
}
public LruBlockCache(long maxSize, long blockSize, Configuration conf) {
@ -321,6 +321,14 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
statThreadPeriod, statThreadPeriod, TimeUnit.SECONDS);
}
@Override
public void setVictimCache(BlockCache victimCache) {
if (victimHandler != null) {
throw new IllegalArgumentException("The victim cache has already been set");
}
victimHandler = requireNonNull(victimCache);
}
@Override
public void setMaxSize(long maxSize) {
this.maxSize = maxSize;
@ -434,6 +442,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
* @param cacheKey block's cache key
* @param buf block buffer
*/
@Override
public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {
cacheBlock(cacheKey, buf, false, false);
}
@ -498,6 +507,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
* @param cacheKey
* @return true if contains the block
*/
@Override
public boolean containsBlock(BlockCacheKey cacheKey) {
return map.containsKey(cacheKey);
}
@ -785,6 +795,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
return totalSize;
}
@Override
public int compareTo(BlockBucket that) {
return Long.compare(this.overflow(), that.overflow());
}
@ -946,6 +957,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
* <p>Includes: total accesses, hits, misses, evicted blocks, and runs
* of the eviction processes.
*/
@Override
public CacheStats getStats() {
return this.stats;
}
@ -1074,6 +1086,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
return (long)Math.floor(this.maxSize * this.memoryFactor * this.minFactor);
}
@Override
public void shutdown() {
if (victimHandler != null)
victimHandler.shutdown();
@ -1122,7 +1135,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
Map<BlockType, Integer> counts =
new EnumMap<BlockType, Integer>(BlockType.class);
for (LruCachedBlock cb : map.values()) {
BlockType blockType = ((Cacheable)cb.getBuffer()).getBlockType();
BlockType blockType = cb.getBuffer().getBlockType();
Integer count = counts.get(blockType);
counts.put(blockType, (count == null ? 0 : count) + 1);
}
@ -1142,11 +1155,6 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
return counts;
}
public void setVictimCache(BlockCache handler) {
assert victimHandler == null;
victimHandler = handler;
}
@VisibleForTesting
Map<BlockCacheKey, LruCachedBlock> getMapForTests() {
return map;

402
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/TinyLfuBlockCache.java Normal file
View File

@ -0,0 +1,402 @@
/**
* 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.io.hfile;
import static java.util.Objects.requireNonNull;
import java.util.Comparator;
import java.util.Iterator;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.HeapSize;
import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
import org.apache.hadoop.util.StringUtils;
import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import com.github.benmanes.caffeine.cache.Policy.Eviction;
import com.github.benmanes.caffeine.cache.RemovalCause;
import com.github.benmanes.caffeine.cache.RemovalListener;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Objects;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* A block cache that is memory-aware using {@link HeapSize}, memory bounded using the W-TinyLFU
* eviction algorithm, and concurrent. This implementation delegates to a Caffeine cache to provide
* O(1) read and write operations.
* <ul>
* <li>W-TinyLFU: http://arxiv.org/pdf/1512.00727.pdf</li>
* <li>Caffeine: https://github.com/ben-manes/caffeine</li>
* <li>Cache design: http://highscalability.com/blog/2016/1/25/design-of-a-modern-cache.html</li>
* </ul>
*/
@InterfaceAudience.Private
public final class TinyLfuBlockCache implements FirstLevelBlockCache {
private static final Log LOG = LogFactory.getLog(TinyLfuBlockCache.class);
private static final String MAX_BLOCK_SIZE = "hbase.tinylfu.max.block.size";
private static final long DEFAULT_MAX_BLOCK_SIZE = 16L * 1024L * 1024L;
private static final int STAT_THREAD_PERIOD_SECONDS = 5 * 60;
private final Eviction<BlockCacheKey, Cacheable> policy;
private final ScheduledExecutorService statsThreadPool;
private final long maxBlockSize;
private final CacheStats stats;
private BlockCache victimCache;
@VisibleForTesting
final Cache<BlockCacheKey, Cacheable> cache;
/**
* Creates a block cache.
*
* @param maximumSizeInBytes maximum size of this cache, in bytes
* @param avgBlockSize expected average size of blocks, in bytes
* @param executor the cache's executor
* @param conf additional configuration
*/
public TinyLfuBlockCache(long maximumSizeInBytes, long avgBlockSize,
Executor executor, Configuration conf) {
this(maximumSizeInBytes, avgBlockSize,
conf.getLong(MAX_BLOCK_SIZE, DEFAULT_MAX_BLOCK_SIZE), executor);
}
/**
* Creates a block cache.
*
* @param maximumSizeInBytes maximum size of this cache, in bytes
* @param avgBlockSize expected average size of blocks, in bytes
* @param maxBlockSize maximum size of a block, in bytes
* @param executor the cache's executor
*/
public TinyLfuBlockCache(long maximumSizeInBytes,
long avgBlockSize, long maxBlockSize, Executor executor) {
this.cache = Caffeine.newBuilder()
.executor(executor)
.maximumWeight(maximumSizeInBytes)
.removalListener(new EvictionListener())
.weigher((BlockCacheKey key, Cacheable value) ->
(int) Math.min(value.heapSize(), Integer.MAX_VALUE))
.initialCapacity((int) Math.ceil((1.2 * maximumSizeInBytes) / avgBlockSize))
.build();
this.maxBlockSize = maxBlockSize;
this.policy = cache.policy().eviction().get();
this.stats = new CacheStats(getClass().getSimpleName());
statsThreadPool = Executors.newSingleThreadScheduledExecutor(new ThreadFactoryBuilder()
.setNameFormat("TinyLfuBlockCacheStatsExecutor").setDaemon(true).build());
statsThreadPool.scheduleAtFixedRate(this::logStats,
STAT_THREAD_PERIOD_SECONDS, STAT_THREAD_PERIOD_SECONDS, TimeUnit.SECONDS);
}
@Override
public void setVictimCache(BlockCache victimCache) {
if (this.victimCache != null) {
throw new IllegalArgumentException("The victim cache has already been set");
}
this.victimCache = requireNonNull(victimCache);
}
@Override
public long size() {
return policy.getMaximum();
}
@Override
public long getFreeSize() {
return size() - getCurrentSize();
}
@Override
public long getCurrentSize() {
return policy.weightedSize().getAsLong();
}
@Override
public long getBlockCount() {
return cache.estimatedSize();
}
@Override
public long heapSize() {
return getCurrentSize();
}
@Override
public void setMaxSize(long size) {
policy.setMaximum(size);
}
@Override
public boolean containsBlock(BlockCacheKey cacheKey) {
return cache.asMap().containsKey(cacheKey);
}
@Override
public Cacheable getBlock(BlockCacheKey cacheKey,
boolean caching, boolean repeat, boolean updateCacheMetrics) {
Cacheable value = cache.getIfPresent(cacheKey);
if (value == null) {
if (repeat) {
return null;
}
if (updateCacheMetrics) {
stats.miss(caching, cacheKey.isPrimary(), cacheKey.getBlockType());
}
if (victimCache != null) {
value = victimCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
if ((value != null) && caching) {
if ((value instanceof HFileBlock) && ((HFileBlock) value).usesSharedMemory()) {
value = ((HFileBlock) value).deepClone();
}
cacheBlock(cacheKey, value);
}
}
} else if (updateCacheMetrics) {
stats.hit(caching, cacheKey.isPrimary(), cacheKey.getBlockType());
}
return value;
}
@Override
public void cacheBlock(BlockCacheKey cacheKey, Cacheable value,
boolean inMemory, boolean cacheDataInL1) {
cacheBlock(cacheKey, value);
}
@Override
public void cacheBlock(BlockCacheKey key, Cacheable value) {
if (value.heapSize() > maxBlockSize) {
// If there are a lot of blocks that are too big this can make the logs too noisy (2% logged)
if (stats.failInsert() % 50 == 0) {
LOG.warn(String.format(
"Trying to cache too large a block %s @ %,d is %,d which is larger than %,d",
key.getHfileName(), key.getOffset(), value.heapSize(), DEFAULT_MAX_BLOCK_SIZE));
}
} else {
cache.put(key, value);
}
}
@Override
public boolean evictBlock(BlockCacheKey cacheKey) {
Cacheable value = cache.asMap().remove(cacheKey);
return (value != null);
}
@Override
public int evictBlocksByHfileName(String hfileName) {
int evicted = 0;
for (BlockCacheKey key : cache.asMap().keySet()) {
if (key.getHfileName().equals(hfileName) && evictBlock(key)) {
evicted++;
}
}
if (victimCache != null) {
evicted += victimCache.evictBlocksByHfileName(hfileName);
}
return evicted;
}
@Override
public CacheStats getStats() {
return stats;
}
@Override
public void shutdown() {
if (victimCache != null) {
victimCache.shutdown();
}
statsThreadPool.shutdown();
}
@Override
public BlockCache[] getBlockCaches() {
return null;
}
@Override
public Iterator<CachedBlock> iterator() {
long now = System.nanoTime();
return cache.asMap().entrySet().stream()
.map(entry -> (CachedBlock) new CachedBlockView(entry.getKey(), entry.getValue(), now))
.iterator();
}
@Override
public void returnBlock(BlockCacheKey cacheKey, Cacheable block) {
// There is no SHARED type here in L1. But the block might have been served from the L2 victim
// cache (when the Combined mode = false). So just try return this block to the victim cache.
// Note : In case of CombinedBlockCache we will have this victim cache configured for L1
// cache. But CombinedBlockCache will only call returnBlock on L2 cache.
if (victimCache != null) {
victimCache.returnBlock(cacheKey, block);
}
}
private void logStats() {
LOG.info(
"totalSize=" + StringUtils.byteDesc(heapSize()) + ", " +
"freeSize=" + StringUtils.byteDesc(getFreeSize()) + ", " +
"max=" + StringUtils.byteDesc(size()) + ", " +
"blockCount=" + getBlockCount() + ", " +
"accesses=" + stats.getRequestCount() + ", " +
"hits=" + stats.getHitCount() + ", " +
"hitRatio=" + (stats.getHitCount() == 0 ?
"0," : StringUtils.formatPercent(stats.getHitRatio(), 2) + ", ") +
"cachingAccesses=" + stats.getRequestCachingCount() + ", " +
"cachingHits=" + stats.getHitCachingCount() + ", " +
"cachingHitsRatio=" + (stats.getHitCachingCount() == 0 ?
"0,": (StringUtils.formatPercent(stats.getHitCachingRatio(), 2) + ", ")) +
"evictions=" + stats.getEvictionCount() + ", " +
"evicted=" + stats.getEvictedCount());
}
@Override
public String toString() {
return Objects.toStringHelper(this)
.add("blockCount", getBlockCount())
.add("currentSize", getCurrentSize())
.add("freeSize", getFreeSize())
.add("maxSize", size())
.add("heapSize", heapSize())
.add("victimCache", (victimCache != null))
.toString();
}
/** A removal listener to asynchronously record evictions and populate the victim cache. */
private final class EvictionListener implements RemovalListener<BlockCacheKey, Cacheable> {
@Override
public void onRemoval(BlockCacheKey key, Cacheable value, RemovalCause cause) {
if (!cause.wasEvicted()) {
// An explicit eviction (invalidation) is not added to the victim cache as the data may
// no longer be valid for subsequent queries.
return;
}
recordEviction();
if (victimCache == null) {
return;
} else if (victimCache instanceof BucketCache) {
BucketCache victimBucketCache = (BucketCache) victimCache;
victimBucketCache.cacheBlockWithWait(key, value, /* inMemory */ true, /* wait */ true);
} else {
victimCache.cacheBlock(key, value);
}
}
}
/**
* Records an eviction. The number of eviction operations and evicted blocks are identical, as
* an eviction is triggered immediately when the capacity has been exceeded. An eviction is
* performed asynchronously. See the library's documentation for details on write buffers,
* batching, and maintenance behavior.
*/
private void recordEviction() {
// FIXME: Currently does not capture the insertion time
stats.evicted(Long.MAX_VALUE, true);
stats.evict();
}
private static final class CachedBlockView implements CachedBlock {
private static final Comparator<CachedBlock> COMPARATOR = Comparator
.comparing(CachedBlock::getFilename)
.thenComparing(CachedBlock::getOffset)
.thenComparing(CachedBlock::getCachedTime);
private final BlockCacheKey key;
private final Cacheable value;
private final long now;
public CachedBlockView(BlockCacheKey key, Cacheable value, long now) {
this.now = now;
this.key = key;
this.value = value;
}
@Override
public BlockPriority getBlockPriority() {
// This does not appear to be used in any meaningful way and is irrelevant to this cache
return BlockPriority.MEMORY;
}
@Override
public BlockType getBlockType() {
return value.getBlockType();
}
@Override
public long getOffset() {
return key.getOffset();
}
@Override
public long getSize() {
return value.heapSize();
}
@Override
public long getCachedTime() {
// This does not appear to be used in any meaningful way, so not captured
return 0L;
}
@Override
public String getFilename() {
return key.getHfileName();
}
@Override
public int compareTo(CachedBlock other) {
return COMPARATOR.compare(this, other);
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
} else if (!(obj instanceof CachedBlock)) {
return false;
}
CachedBlock other = (CachedBlock) obj;
return compareTo(other) == 0;
}
@Override
public int hashCode() {
return key.hashCode();
}
@Override
public String toString() {
return BlockCacheUtil.toString(this, now);
}
}
}

5
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java
View File

@ -88,11 +88,10 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
*
* <p>BucketCache can be used as mainly a block cache (see
* {@link org.apache.hadoop.hbase.io.hfile.CombinedBlockCache}), combined with
* LruBlockCache to decrease CMS GC and heap fragmentation.
* a BlockCache to decrease CMS GC and heap fragmentation.
*
* <p>It also can be used as a secondary cache (e.g. using a file on ssd/fusionio to store
* blocks) to enlarge cache space via
* {@link org.apache.hadoop.hbase.io.hfile.LruBlockCache#setVictimCache}
* blocks) to enlarge cache space via a victim cache.
*/
@InterfaceAudience.Private
public class BucketCache implements BlockCache, HeapSize {

8
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestCacheConfig.java
View File

@ -37,12 +37,12 @@ import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.testclassification.IOTests;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.io.hfile.BlockType.BlockCategory;
import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;
import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
import org.apache.hadoop.hbase.nio.ByteBuff;
import org.apache.hadoop.hbase.testclassification.IOTests;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.util.Threads;
import org.junit.After;
import org.junit.Before;
@ -328,7 +328,7 @@ public class TestCacheConfig {
BlockCache [] bcs = cbc.getBlockCaches();
assertTrue(bcs[0] instanceof LruBlockCache);
LruBlockCache lbc = (LruBlockCache)bcs[0];
assertEquals(CacheConfig.getLruCacheSize(this.conf,
assertEquals(CacheConfig.getFirstLevelCacheSize(this.conf,
ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getMax()), lbc.getMaxSize());
assertTrue(bcs[1] instanceof BucketCache);
BucketCache bc = (BucketCache)bcs[1];
@ -347,7 +347,7 @@ public class TestCacheConfig {
// from L1 happens, it does not fail because L2 can't take the eviction because block too big.
this.conf.setFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, 0.001f);
MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
long lruExpectedSize = CacheConfig.getLruCacheSize(this.conf, mu.getMax());
long lruExpectedSize = CacheConfig.getFirstLevelCacheSize(this.conf, mu.getMax());
final int bcSize = 100;
long bcExpectedSize = 100 * 1024 * 1024; // MB.
assertTrue(lruExpectedSize < bcExpectedSize);

304
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestTinyLfuBlockCache.java Normal file
View File

@ -0,0 +1,304 @@
/**
*
* 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.io.hfile;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.nio.ByteBuffer;
import java.util.Random;
import org.apache.hadoop.hbase.io.HeapSize;
import org.apache.hadoop.hbase.testclassification.IOTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.apache.hadoop.hbase.util.ClassSize;
import org.junit.Test;
import org.junit.experimental.categories.Category;
/**
* Tests the concurrent TinyLfuBlockCache.
*/
@Category({IOTests.class, SmallTests.class})
public class TestTinyLfuBlockCache {
@Test
public void testCacheSimple() throws Exception {
long maxSize = 1000000;
long blockSize = calculateBlockSizeDefault(maxSize, 101);
TinyLfuBlockCache cache = new TinyLfuBlockCache(maxSize, blockSize, blockSize, Runnable::run);
CachedItem [] blocks = generateRandomBlocks(100, blockSize);
long expectedCacheSize = cache.heapSize();
// Confirm empty
for (CachedItem block : blocks) {
assertTrue(cache.getBlock(block.cacheKey, true, false, true) == null);
}
// Add blocks
for (CachedItem block : blocks) {
cache.cacheBlock(block.cacheKey, block);
expectedCacheSize += block.heapSize();
}
// Verify correctly calculated cache heap size
assertEquals(expectedCacheSize, cache.heapSize());
// Check if all blocks are properly cached and retrieved
for (CachedItem block : blocks) {
HeapSize buf = cache.getBlock(block.cacheKey, true, false, true);
assertTrue(buf != null);
assertEquals(buf.heapSize(), block.heapSize());
}
// Re-add same blocks and ensure nothing has changed
long expectedBlockCount = cache.getBlockCount();
for (CachedItem block : blocks) {
cache.cacheBlock(block.cacheKey, block);
}
assertEquals(
"Cache should ignore cache requests for blocks already in cache",
expectedBlockCount, cache.getBlockCount());
// Verify correctly calculated cache heap size
assertEquals(expectedCacheSize, cache.heapSize());
// Check if all blocks are properly cached and retrieved
for (CachedItem block : blocks) {
HeapSize buf = cache.getBlock(block.cacheKey, true, false, true);
assertTrue(buf != null);
assertEquals(buf.heapSize(), block.heapSize());
}
// Expect no evictions
assertEquals(0, cache.getStats().getEvictionCount());
}
@Test
public void testCacheEvictionSimple() throws Exception {
long maxSize = 100000;
long blockSize = calculateBlockSizeDefault(maxSize, 10);
TinyLfuBlockCache cache = new TinyLfuBlockCache(maxSize, blockSize, blockSize, Runnable::run);
CachedItem [] blocks = generateFixedBlocks(11, blockSize, "block");
// Add all the blocks
for (CachedItem block : blocks) {
cache.cacheBlock(block.cacheKey, block);
}
// A single eviction run should have occurred
assertEquals(1, cache.getStats().getEvictionCount());
// The cache did not grow beyond max
assertTrue(cache.heapSize() < maxSize);
// All blocks except one should be in the cache
assertEquals(10, cache.getBlockCount());
}
@Test
public void testScanResistance() throws Exception {
long maxSize = 100000;
long blockSize = calculateBlockSize(maxSize, 10);
TinyLfuBlockCache cache = new TinyLfuBlockCache(maxSize, blockSize, blockSize, Runnable::run);
CachedItem [] singleBlocks = generateFixedBlocks(20, blockSize, "single");
CachedItem [] multiBlocks = generateFixedBlocks(5, blockSize, "multi");
// Add 5 blocks from each
for(int i=0; i<5; i++) {
cache.cacheBlock(singleBlocks[i].cacheKey, singleBlocks[i]);
cache.cacheBlock(multiBlocks[i].cacheKey, multiBlocks[i]);
}
// Add frequency
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 10; j++) {
CachedItem block = multiBlocks[i];
cache.getBlock(block.cacheKey, true, false, true);
}
}
// Let's keep "scanning" by adding single blocks. From here on we only
// expect evictions from the single bucket.
for(int i=5;i<18;i++) {
cache.cacheBlock(singleBlocks[i].cacheKey, singleBlocks[i]);
}
for (CachedItem block : multiBlocks) {
assertTrue(cache.cache.asMap().containsKey(block.cacheKey));
}
assertEquals(10, cache.getBlockCount());
assertEquals(13, cache.getStats().getEvictionCount());
}
@Test
public void testMaxBlockSize() throws Exception {
long maxSize = 100000;
long blockSize = calculateBlockSize(maxSize, 10);
TinyLfuBlockCache cache = new TinyLfuBlockCache(maxSize, blockSize, blockSize, Runnable::run);
CachedItem [] tooLong = generateFixedBlocks(10, 2 * blockSize, "long");
CachedItem [] small = generateFixedBlocks(15, blockSize / 2, "small");
for (CachedItem i:tooLong) {
cache.cacheBlock(i.cacheKey, i);
}
for (CachedItem i:small) {
cache.cacheBlock(i.cacheKey, i);
}
assertEquals(15,cache.getBlockCount());
for (CachedItem i:small) {
assertNotNull(cache.getBlock(i.cacheKey, true, false, false));
}
for (CachedItem i:tooLong) {
assertNull(cache.getBlock(i.cacheKey, true, false, false));
}
assertEquals(10, cache.getStats().getFailedInserts());
}
@Test
public void testResizeBlockCache() throws Exception {
long maxSize = 100000;
long blockSize = calculateBlockSize(maxSize, 10);
TinyLfuBlockCache cache = new TinyLfuBlockCache(maxSize, blockSize, blockSize, Runnable::run);
CachedItem [] blocks = generateFixedBlocks(10, blockSize, "block");
for(CachedItem block : blocks) {
cache.cacheBlock(block.cacheKey, block);
}
// Do not expect any evictions yet
assertEquals(10, cache.getBlockCount());
assertEquals(0, cache.getStats().getEvictionCount());
// Resize to half capacity plus an extra block (otherwise we evict an extra)
cache.setMaxSize(maxSize / 2);
// And we expect 1/2 of the blocks to be evicted
assertEquals(5, cache.getBlockCount());
assertEquals(5, cache.getStats().getEvictedCount());
}
private CachedItem [] generateFixedBlocks(int numBlocks, int size, String pfx) {
CachedItem [] blocks = new CachedItem[numBlocks];
for(int i=0;i<numBlocks;i++) {
blocks[i] = new CachedItem(pfx + i, size);
}
return blocks;
}
private CachedItem [] generateFixedBlocks(int numBlocks, long size, String pfx) {
return generateFixedBlocks(numBlocks, (int)size, pfx);
}
private CachedItem [] generateRandomBlocks(int numBlocks, long maxSize) {
CachedItem [] blocks = new CachedItem[numBlocks];
Random r = new Random();
for(int i=0;i<numBlocks;i++) {
blocks[i] = new CachedItem("block" + i, r.nextInt((int)maxSize)+1);
}
return blocks;
}
private long calculateBlockSize(long maxSize, int numBlocks) {
long roughBlockSize = maxSize / numBlocks;
int numEntries = (int)Math.ceil((1.2)*maxSize/roughBlockSize);
long totalOverhead = LruBlockCache.CACHE_FIXED_OVERHEAD +
ClassSize.CONCURRENT_HASHMAP +
(numEntries * ClassSize.CONCURRENT_HASHMAP_ENTRY) +
(LruBlockCache.DEFAULT_CONCURRENCY_LEVEL * ClassSize.CONCURRENT_HASHMAP_SEGMENT);
long negateBlockSize = totalOverhead/numEntries;
negateBlockSize += LruCachedBlock.PER_BLOCK_OVERHEAD;
return ClassSize.align((long)Math.floor((roughBlockSize - negateBlockSize)*0.99f));
}
private long calculateBlockSizeDefault(long maxSize, int numBlocks) {
long roughBlockSize = maxSize / numBlocks;
int numEntries = (int)Math.ceil((1.2)*maxSize/roughBlockSize);
long totalOverhead = LruBlockCache.CACHE_FIXED_OVERHEAD +
ClassSize.CONCURRENT_HASHMAP +
(numEntries * ClassSize.CONCURRENT_HASHMAP_ENTRY) +
(LruBlockCache.DEFAULT_CONCURRENCY_LEVEL * ClassSize.CONCURRENT_HASHMAP_SEGMENT);
long negateBlockSize = totalOverhead / numEntries;
negateBlockSize += LruCachedBlock.PER_BLOCK_OVERHEAD;
return ClassSize.align((long)Math.floor((roughBlockSize - negateBlockSize)*
LruBlockCache.DEFAULT_ACCEPTABLE_FACTOR));
}
private static class CachedItem implements Cacheable {
BlockCacheKey cacheKey;
int size;
CachedItem(String blockName, int size) {
this.cacheKey = new BlockCacheKey(blockName, 0);
this.size = size;
}
/** The size of this item reported to the block cache layer */
@Override
public long heapSize() {
return ClassSize.align(size);
}
@Override
public int getSerializedLength() {
return 0;
}
@Override
public CacheableDeserializer<Cacheable> getDeserializer() {
return null;
}
@Override
public void serialize(ByteBuffer destination) {
}
@Override
public BlockType getBlockType() {
return BlockType.DATA;
}
@Override
public MemoryType getMemoryType() {
return MemoryType.EXCLUSIVE;
}
}
}

6
pom.xml
View File

@ -1198,6 +1198,7 @@
<httpclient.version>4.5.2</httpclient.version>
<httpcore.version>4.4.4</httpcore.version>
<metrics-core.version>3.1.2</metrics-core.version>
<caffeine.version>2.3.3</caffeine.version>
<guava.version>12.0.1</guava.version>
<jackson.version>1.9.13</jackson.version>
<jasper.version>5.5.23</jasper.version>
@ -1481,6 +1482,11 @@
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>com.github.ben-manes.caffeine</groupId>
<artifactId>caffeine</artifactId>
<version>${caffeine.version}</version>
</dependency>
<dependency>
<groupId>io.dropwizard.metrics</groupId>
<artifactId>metrics-core</artifactId>