1 /** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 20 package org.apache.hadoop.hbase.regionserver.compactions; 21 22 import java.io.IOException; 23 import java.util.Collection; 24 import java.util.List; 25 26 import org.apache.hadoop.classification.InterfaceAudience; 27 import org.apache.hadoop.conf.Configuration; 28 import org.apache.hadoop.hbase.regionserver.StoreConfigInformation; 29 import org.apache.hadoop.hbase.regionserver.StoreFile; 30 31 /** 32 * A compaction policy determines how to select files for compaction, 33 * how to compact them, and how to generate the compacted files. 34 */ 35 @InterfaceAudience.Private 36 public abstract class CompactionPolicy { 37 protected CompactionConfiguration comConf; 38 protected StoreConfigInformation storeConfigInfo; 39 40 public CompactionPolicy(Configuration conf, StoreConfigInformation storeConfigInfo) { 41 this.storeConfigInfo = storeConfigInfo; 42 this.comConf = new CompactionConfiguration(conf, this.storeConfigInfo); 43 } 44 45 /** 46 * @param filesToCompact Files to compact. Can be null. 47 * @return True if we should run a major compaction. 48 */ 49 public abstract boolean isMajorCompaction( 50 final Collection<StoreFile> filesToCompact) throws IOException; 51 52 /** 53 * @param compactionSize Total size of some compaction 54 * @return whether this should be a large or small compaction 55 */ 56 public abstract boolean throttleCompaction(long compactionSize); 57 58 /** 59 * Inform the policy that some configuration has been change, 60 * so cached value should be updated it any. 61 */ 62 public void setConf(Configuration conf) { 63 this.comConf = new CompactionConfiguration(conf, this.storeConfigInfo); 64 } 65 }