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server/src/main/java/org/apache/iotdb/db/engine/cache/ChunkCache.java
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| /* | ||
| * 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.iotdb.db.engine.cache; | ||
|
|
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| import org.apache.iotdb.db.conf.IoTDBConfig; | ||
| import org.apache.iotdb.db.conf.IoTDBDescriptor; | ||
| import org.apache.iotdb.tsfile.file.metadata.ChunkMetaData; | ||
| import org.apache.iotdb.tsfile.read.TsFileSequenceReader; | ||
| import org.apache.iotdb.tsfile.read.common.Chunk; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.concurrent.atomic.AtomicLong; | ||
| import java.util.concurrent.locks.ReadWriteLock; | ||
| import java.util.concurrent.locks.ReentrantReadWriteLock; | ||
|
|
||
| /** | ||
| * This class is used to cache <code>Chunk</code> of <code>ChunkMetaData</code> in IoTDB. The caching | ||
| * strategy is LRU. | ||
| */ | ||
| public class ChunkCache { | ||
|
|
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| private static final Logger logger = LoggerFactory.getLogger(ChunkCache.class); | ||
| private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig(); | ||
| private static final long MEMORY_THRESHOLD_IN_CHUNK_CACHE = config.getAllocateMemoryForChunkCache(); | ||
| private static boolean cacheEnable = config.isMetaDataCacheEnable(); | ||
|
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| private final LRULinkedHashMap<ChunkMetaData, Chunk> lruCache; | ||
|
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| private AtomicLong cacheHitNum = new AtomicLong(); | ||
| private AtomicLong cacheRequestNum = new AtomicLong(); | ||
|
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| private final ReadWriteLock lock = new ReentrantReadWriteLock(); | ||
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| private ChunkCache() { | ||
| lruCache = new LRULinkedHashMap<ChunkMetaData, Chunk>(MEMORY_THRESHOLD_IN_CHUNK_CACHE, true) { | ||
| @Override | ||
| protected long calEntrySize(ChunkMetaData key, Chunk value) { | ||
| return RamUsageEstimator.shallowSizeOf(key) + RamUsageEstimator.sizeOf(value); | ||
| } | ||
| }; | ||
| } | ||
|
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| public static ChunkCache getInstance() { | ||
| return ChunkCacheHolder.INSTANCE; | ||
| } | ||
|
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| public Chunk get(ChunkMetaData chunkMetaData, TsFileSequenceReader reader) throws IOException { | ||
| if (!cacheEnable) { | ||
| Chunk chunk = reader.readMemChunk(chunkMetaData); | ||
| return new Chunk(chunk.getHeader(), chunk.getData().duplicate(), chunk.getDeletedAt(), reader.getEndianType()); | ||
| } | ||
|
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| cacheRequestNum.incrementAndGet(); | ||
|
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| try { | ||
| lock.readLock().lock(); | ||
| if (lruCache.containsKey(chunkMetaData)) { | ||
| cacheHitNum.incrementAndGet(); | ||
| printCacheLog(true); | ||
| Chunk chunk = lruCache.get(chunkMetaData); | ||
| return new Chunk(chunk.getHeader(), chunk.getData().duplicate(), chunk.getDeletedAt(), reader.getEndianType()); | ||
| } | ||
| } finally { | ||
| lock.readLock().unlock(); | ||
| } | ||
|
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| lock.writeLock().lock(); | ||
| if (lruCache.containsKey(chunkMetaData)) { | ||
| lock.readLock().lock(); | ||
| lock.writeLock().unlock(); | ||
| cacheHitNum.incrementAndGet(); | ||
| printCacheLog(true); | ||
| Chunk chunk = lruCache.get(chunkMetaData); | ||
| lock.readLock().unlock(); | ||
| return new Chunk(chunk.getHeader(), chunk.getData().duplicate(), chunk.getDeletedAt(), reader.getEndianType()); | ||
| } | ||
| printCacheLog(false); | ||
| Chunk chunk = reader.readMemChunk(chunkMetaData); | ||
| lruCache.put(chunkMetaData, chunk); | ||
| lock.writeLock().unlock(); | ||
| return new Chunk(chunk.getHeader(), chunk.getData().duplicate(), chunk.getDeletedAt(), reader.getEndianType()); | ||
|
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| } | ||
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| private void printCacheLog(boolean isHit) { | ||
| if (!logger.isDebugEnabled()) { | ||
| return; | ||
| } | ||
| logger.debug( | ||
| "[ChunkMetaData cache {}hit] The number of requests for cache is {}, hit rate is {}.", | ||
| isHit ? "" : "didn't ", cacheRequestNum.get(), | ||
| cacheHitNum.get() * 1.0 / cacheRequestNum.get()); | ||
| } | ||
|
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| public double calculateChunkHitRatio() { | ||
| if (cacheRequestNum.get() != 0) { | ||
| return cacheHitNum.get() * 1.0 / cacheRequestNum.get(); | ||
| } else { | ||
| return 0; | ||
| } | ||
| } | ||
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| /** | ||
| * clear LRUCache. | ||
| */ | ||
| public void clear() { | ||
| lock.writeLock().lock(); | ||
| if (lruCache != null) { | ||
| lruCache.clear(); | ||
| } | ||
| lock.writeLock().unlock(); | ||
| } | ||
|
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| public void remove(ChunkMetaData chunkMetaData) { | ||
| lock.writeLock().lock(); | ||
| if (chunkMetaData != null) { | ||
| lruCache.remove(chunkMetaData); | ||
| } | ||
| lock.writeLock().unlock(); | ||
| } | ||
|
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| /** | ||
| * singleton pattern. | ||
| */ | ||
| private static class ChunkCacheHolder { | ||
|
|
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| private static final ChunkCache INSTANCE = new ChunkCache(); | ||
| } | ||
| } |
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