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 org.apache.yetus.audience.InterfaceAudience; 021 022@InterfaceAudience.Private 023public class InclusiveCombinedBlockCache extends CombinedBlockCache { 024 public InclusiveCombinedBlockCache(FirstLevelBlockCache l1, BlockCache l2) { 025 super(l1, l2); 026 l1.setVictimCache(l2); 027 } 028 029 @Override 030 public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching, boolean repeat, 031 boolean updateCacheMetrics) { 032 // On all external cache set ups the lru should have the l2 cache set as the victimHandler 033 // Because of that all requests that miss inside of the lru block cache will be 034 // tried in the l2 block cache. 035 return l1Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics); 036 } 037 038 /** 039 * @param cacheKey The block's cache key. 040 * @param buf The block contents wrapped in a ByteBuffer. 041 * @param inMemory Whether block should be treated as in-memory. This parameter is only useful for 042 * the L1 lru cache. 043 */ 044 @Override 045 public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) { 046 // This is the inclusive part of the combined block cache. 047 // Every block is placed into both block caches. 048 l1Cache.cacheBlock(cacheKey, buf, inMemory); 049 050 // This assumes that insertion into the L2 block cache is either async or very fast. 051 l2Cache.cacheBlock(cacheKey, buf, inMemory); 052 } 053 054 @Override 055 public boolean evictBlock(BlockCacheKey cacheKey) { 056 boolean l1Result = this.l1Cache.evictBlock(cacheKey); 057 boolean l2Result = this.l2Cache.evictBlock(cacheKey); 058 return l1Result || l2Result; 059 } 060}