| /* |
| * 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.ratis.server.storage; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.concurrent.atomic.AtomicReference; |
| import org.apache.ratis.proto.RaftProtos.LogEntryProto; |
| import org.apache.ratis.server.RaftConfiguration; |
| import org.apache.ratis.server.RaftServerConfigKeys.Log.CorruptionPolicy; |
| import org.apache.ratis.server.raftlog.LogProtoUtils; |
| import org.apache.ratis.server.storage.RaftStorageDirectoryImpl.StorageState; |
| import org.apache.ratis.util.AtomicFileOutputStream; |
| import org.apache.ratis.util.FileUtils; |
| import org.apache.ratis.util.JavaUtils; |
| import org.apache.ratis.util.SizeInBytes; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.util.Optional; |
| |
| /** The storage of a {@link org.apache.ratis.server.RaftServer}. */ |
| public class RaftStorageImpl implements RaftStorage { |
| private final RaftStorageDirectoryImpl storageDir; |
| private final StartupOption startupOption; |
| private final CorruptionPolicy logCorruptionPolicy; |
| private volatile StorageState state = StorageState.UNINITIALIZED; |
| private final MetaFile metaFile = new MetaFile(); |
| |
| RaftStorageImpl(File dir, SizeInBytes freeSpaceMin, StartupOption option, CorruptionPolicy logCorruptionPolicy) { |
| LOG.debug("newRaftStorage: {}, freeSpaceMin={}, option={}, logCorruptionPolicy={}", |
| dir, freeSpaceMin, option, logCorruptionPolicy); |
| this.storageDir = new RaftStorageDirectoryImpl(dir, freeSpaceMin); |
| this.logCorruptionPolicy = Optional.ofNullable(logCorruptionPolicy).orElseGet(CorruptionPolicy::getDefault); |
| this.startupOption = option; |
| } |
| |
| @Override |
| public void initialize() throws IOException { |
| try { |
| if (startupOption == StartupOption.FORMAT) { |
| if (storageDir.analyzeStorage(false) == StorageState.NON_EXISTENT) { |
| throw new IOException("Cannot format " + storageDir); |
| } |
| storageDir.lock(); |
| format(); |
| state = storageDir.analyzeStorage(false); |
| } else { |
| // metaFile is initialized here |
| state = analyzeAndRecoverStorage(true); |
| } |
| } catch (Throwable t) { |
| unlockOnFailure(storageDir); |
| throw t; |
| } |
| |
| if (state != StorageState.NORMAL) { |
| unlockOnFailure(storageDir); |
| throw new IOException("Failed to load " + storageDir + ": " + state); |
| } |
| } |
| |
| static void unlockOnFailure(RaftStorageDirectoryImpl dir) { |
| try { |
| dir.unlock(); |
| } catch (Throwable t) { |
| LOG.warn("Failed to unlock " + dir, t); |
| } |
| } |
| |
| StorageState getState() { |
| return state; |
| } |
| |
| public CorruptionPolicy getLogCorruptionPolicy() { |
| return logCorruptionPolicy; |
| } |
| |
| private void format() throws IOException { |
| storageDir.clearDirectory(); |
| metaFile.set(storageDir.getMetaFile()).persist(RaftStorageMetadata.getDefault()); |
| LOG.info("Storage directory {} has been successfully formatted.", storageDir.getRoot()); |
| } |
| |
| private void cleanMetaTmpFile() throws IOException { |
| FileUtils.deleteIfExists(storageDir.getMetaTmpFile()); |
| } |
| |
| private StorageState analyzeAndRecoverStorage(boolean toLock) throws IOException { |
| StorageState storageState = storageDir.analyzeStorage(toLock); |
| // Existence of raft-meta.tmp means the change of votedFor/term has not |
| // been committed. Thus we should delete the tmp file. |
| if (storageState != StorageState.NON_EXISTENT) { |
| cleanMetaTmpFile(); |
| } |
| if (storageState == StorageState.NORMAL) { |
| final File f = storageDir.getMetaFile(); |
| if (!f.exists()) { |
| throw new FileNotFoundException("Metadata file " + f + " does not exists."); |
| } |
| final RaftStorageMetadata metadata = metaFile.set(f).getMetadata(); |
| LOG.info("Read {} from {}", metadata, f); |
| return StorageState.NORMAL; |
| } else if (storageState == StorageState.NOT_FORMATTED && |
| storageDir.isCurrentEmpty()) { |
| format(); |
| return StorageState.NORMAL; |
| } else { |
| return storageState; |
| } |
| } |
| |
| @Override |
| public RaftStorageDirectoryImpl getStorageDir() { |
| return storageDir; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| storageDir.unlock(); |
| } |
| |
| @Override |
| public RaftStorageMetadataFile getMetadataFile() { |
| return metaFile.get(); |
| } |
| |
| public void writeRaftConfiguration(LogEntryProto conf) { |
| File confFile = storageDir.getMetaConfFile(); |
| try (OutputStream fio = new AtomicFileOutputStream(confFile)) { |
| conf.writeTo(fio); |
| } catch (Exception e) { |
| LOG.error("Failed writing configuration to file:" + confFile, e); |
| } |
| } |
| |
| public RaftConfiguration readRaftConfiguration() { |
| File confFile = storageDir.getMetaConfFile(); |
| if (!confFile.exists()) { |
| return null; |
| } else { |
| try (InputStream fio = FileUtils.newInputStream(confFile)) { |
| LogEntryProto confProto = LogEntryProto.newBuilder().mergeFrom(fio).build(); |
| return LogProtoUtils.toRaftConfiguration(confProto); |
| } catch (Exception e) { |
| LOG.error("Failed reading configuration from file:" + confFile, e); |
| return null; |
| } |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return JavaUtils.getClassSimpleName(getClass()) + ":" + getStorageDir(); |
| } |
| |
| static class MetaFile { |
| private final AtomicReference<RaftStorageMetadataFileImpl> ref = new AtomicReference<>(); |
| |
| RaftStorageMetadataFile get() { |
| return ref.get(); |
| } |
| |
| RaftStorageMetadataFile set(File file) { |
| final RaftStorageMetadataFileImpl impl = new RaftStorageMetadataFileImpl(file); |
| ref.set(impl); |
| return impl; |
| } |
| } |
| } |