| /* |
| * 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.metadata; |
| |
| import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos; |
| import org.apache.hadoop.hdds.utils.db.Codec; |
| import org.apache.hadoop.ozone.container.common.helpers.ChunkInfoList; |
| import org.apache.ratis.thirdparty.com.google.protobuf.InvalidProtocolBufferException; |
| |
| import java.io.IOException; |
| |
| /** |
| * Codec for parsing {@link ContainerProtos.ChunkInfoList} objects from data |
| * that may have been written using schema version one. Before upgrading |
| * schema versions, deleted block IDs were stored with a duplicate copy of |
| * their ID as the value in the database. After upgrading the code, any |
| * deletes that happen on the DB will save the chunk information with the |
| * deleted blocks instead, even if those deletes are performed on a database |
| * created with schema version one. |
| * <p> |
| * Since the resulting database may contain a mix of values that could either |
| * be block IDs or chunk information, this codec will attempt to parse bytes as |
| * chunk information, and on failure, throw an exception with a message about |
| * the old schema format. |
| * <p> |
| * Note that there is currently no where in the code (except for tests) where |
| * the values associated with deleted block IDs are used. If it is added in the |
| * future, callers should be aware that the associated chunk information may not |
| * always be present. |
| */ |
| public class SchemaOneChunkInfoListCodec implements Codec<ChunkInfoList> { |
| @Override |
| public byte[] toPersistedFormat(ChunkInfoList chunkList) { |
| return chunkList.getProtoBufMessage().toByteArray(); |
| } |
| |
| @Override |
| public ChunkInfoList fromPersistedFormat(byte[] rawData) throws IOException { |
| try { |
| return ChunkInfoList.getFromProtoBuf( |
| ContainerProtos.ChunkInfoList.parseFrom(rawData)); |
| } catch (InvalidProtocolBufferException ex) { |
| throw new IOException("Invalid chunk information. " + |
| "This data may have been written using datanode " + |
| "schema version one, which did not save chunk information.", ex); |
| } |
| } |
| |
| @Override |
| public ChunkInfoList copyObject(ChunkInfoList object) { |
| throw new UnsupportedOperationException(); |
| } |
| } |