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.regionserver.compactions; 019 020import java.io.IOException; 021import java.util.Collection; 022import org.apache.hadoop.conf.Configuration; 023import org.apache.hadoop.hbase.regionserver.HStoreFile; 024import org.apache.hadoop.hbase.regionserver.StoreConfigInformation; 025import org.apache.yetus.audience.InterfaceAudience; 026 027/** 028 * A compaction policy determines how to select files for compaction, how to compact them, and how 029 * to generate the compacted files. 030 */ 031@InterfaceAudience.Private 032public abstract class CompactionPolicy { 033 protected CompactionConfiguration comConf; 034 protected StoreConfigInformation storeConfigInfo; 035 036 public CompactionPolicy(Configuration conf, StoreConfigInformation storeConfigInfo) { 037 this.storeConfigInfo = storeConfigInfo; 038 this.comConf = new CompactionConfiguration(conf, this.storeConfigInfo); 039 } 040 041 /** 042 * @param filesToCompact Files to compact. Can be null. 043 * @return True if we should run a major compaction. 044 */ 045 public abstract boolean shouldPerformMajorCompaction(Collection<HStoreFile> filesToCompact) 046 throws IOException; 047 048 /** 049 * @param compactionSize Total size of some compaction 050 * @return whether this should be a large or small compaction 051 */ 052 public abstract boolean throttleCompaction(long compactionSize); 053 054 /** 055 * Inform the policy that some configuration has been change, so cached value should be updated it 056 * any. 057 */ 058 public void setConf(Configuration conf) { 059 this.comConf = new CompactionConfiguration(conf, this.storeConfigInfo); 060 } 061 062 /** Returns The current compaction configuration settings. */ 063 public CompactionConfiguration getConf() { 064 return this.comConf; 065 } 066}