| /** |
| * 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.ozone.container.keyvalue.impl; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.ozone.container.keyvalue.interfaces.ChunkManager; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_CONTAINER_PERSISTDATA; |
| import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_CONTAINER_PERSISTDATA_DEFAULT; |
| import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_CONTAINER_SCRUB_ENABLED; |
| import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_CONTAINER_SCRUB_ENABLED_DEFAULT; |
| |
| /** |
| * Select an appropriate ChunkManager implementation as per config setting. |
| * Ozone ChunkManager is a Singleton |
| */ |
| public final class ChunkManagerFactory { |
| static final Logger LOG = LoggerFactory.getLogger(ChunkManagerFactory.class); |
| |
| private static volatile ChunkManager instance = null; |
| private static boolean syncChunks = false; |
| |
| private ChunkManagerFactory() { |
| } |
| |
| public static ChunkManager getChunkManager(Configuration config, |
| boolean sync) { |
| if (instance == null) { |
| synchronized (ChunkManagerFactory.class) { |
| if (instance == null) { |
| instance = createChunkManager(config, sync); |
| syncChunks = sync; |
| } |
| } |
| } |
| |
| Preconditions.checkArgument((syncChunks == sync), |
| "value of sync conflicts with previous invocation"); |
| return instance; |
| } |
| |
| private static ChunkManager createChunkManager(Configuration config, |
| boolean sync) { |
| ChunkManager manager = null; |
| boolean persist = config.getBoolean(HDDS_CONTAINER_PERSISTDATA, |
| HDDS_CONTAINER_PERSISTDATA_DEFAULT); |
| |
| if (!persist) { |
| boolean scrubber = config.getBoolean( |
| HDDS_CONTAINER_SCRUB_ENABLED, |
| HDDS_CONTAINER_SCRUB_ENABLED_DEFAULT); |
| if (scrubber) { |
| // Data Scrubber needs to be disabled for non-persistent chunks. |
| LOG.warn("Failed to set " + HDDS_CONTAINER_PERSISTDATA + " to false." |
| + " Please set " + HDDS_CONTAINER_SCRUB_ENABLED |
| + " also to false to enable non-persistent containers."); |
| persist = true; |
| } |
| } |
| |
| if (persist) { |
| manager = new ChunkManagerImpl(sync); |
| } else { |
| LOG.warn(HDDS_CONTAINER_PERSISTDATA |
| + " is set to false. This should be used only for testing." |
| + " All user data will be discarded."); |
| manager = new ChunkManagerDummyImpl(sync); |
| } |
| |
| return manager; |
| } |
| } |