| /* |
| * 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.flink.core.fs.local; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.core.fs.RecoverableFsDataOutputStream; |
| import org.apache.flink.core.fs.RecoverableWriter.CommitRecoverable; |
| import org.apache.flink.core.fs.RecoverableWriter.ResumeRecoverable; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.nio.channels.Channels; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.AtomicMoveNotSupportedException; |
| import java.nio.file.FileAlreadyExistsException; |
| import java.nio.file.Files; |
| import java.nio.file.StandardCopyOption; |
| import java.nio.file.StandardOpenOption; |
| |
| import static org.apache.flink.util.Preconditions.checkNotNull; |
| |
| /** |
| * A {@link RecoverableFsDataOutputStream} for the {@link LocalFileSystem}. |
| */ |
| @Internal |
| class LocalRecoverableFsDataOutputStream extends RecoverableFsDataOutputStream { |
| |
| private final File targetFile; |
| |
| private final File tempFile; |
| |
| private final FileChannel fileChannel; |
| |
| private final OutputStream fos; |
| |
| LocalRecoverableFsDataOutputStream(File targetFile, File tempFile) throws IOException { |
| this.targetFile = checkNotNull(targetFile); |
| this.tempFile = checkNotNull(tempFile); |
| |
| this.fileChannel = FileChannel.open(tempFile.toPath(), StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW); |
| this.fos = Channels.newOutputStream(fileChannel); |
| } |
| |
| LocalRecoverableFsDataOutputStream(LocalRecoverable resumable) throws IOException { |
| this.targetFile = checkNotNull(resumable.targetFile()); |
| this.tempFile = checkNotNull(resumable.tempFile()); |
| |
| if (!tempFile.exists()) { |
| throw new FileNotFoundException("File Not Found: " + tempFile.getAbsolutePath()); |
| } |
| |
| this.fileChannel = FileChannel.open(tempFile.toPath(), StandardOpenOption.WRITE, StandardOpenOption.APPEND); |
| if (this.fileChannel.position() < resumable.offset()) { |
| throw new IOException("Missing data in tmp file: " + tempFile.getAbsolutePath()); |
| } |
| this.fileChannel.truncate(resumable.offset()); |
| this.fos = Channels.newOutputStream(fileChannel); |
| } |
| |
| @Override |
| public void write(int b) throws IOException { |
| fos.write(b); |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| fos.write(b, off, len); |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| fos.flush(); |
| } |
| |
| @Override |
| public void sync() throws IOException { |
| fileChannel.force(true); |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return fileChannel.position(); |
| } |
| |
| @Override |
| public ResumeRecoverable persist() throws IOException { |
| // we call both flush and sync in order to ensure persistence on mounted |
| // file systems, like NFS, EBS, EFS, ... |
| flush(); |
| sync(); |
| |
| return new LocalRecoverable(targetFile, tempFile, getPos()); |
| } |
| |
| @Override |
| public Committer closeForCommit() throws IOException { |
| final long pos = getPos(); |
| close(); |
| return new LocalCommitter(new LocalRecoverable(targetFile, tempFile, pos)); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| fos.close(); |
| } |
| |
| // ------------------------------------------------------------------------ |
| |
| static class LocalCommitter implements Committer { |
| |
| private final LocalRecoverable recoverable; |
| |
| LocalCommitter(LocalRecoverable recoverable) { |
| this.recoverable = checkNotNull(recoverable); |
| } |
| |
| @Override |
| public void commit() throws IOException { |
| final File src = recoverable.tempFile(); |
| final File dest = recoverable.targetFile(); |
| |
| // sanity check |
| if (src.length() != recoverable.offset()) { |
| // something was done to this file since the committer was created. |
| // this is not the "clean" case |
| throw new IOException("Cannot clean commit: File has trailing junk data."); |
| } |
| |
| // rather than fall into default recovery, handle errors explicitly |
| // in order to improve error messages |
| try { |
| Files.move(src.toPath(), dest.toPath(), StandardCopyOption.ATOMIC_MOVE); |
| } |
| catch (UnsupportedOperationException | AtomicMoveNotSupportedException e) { |
| if (!src.renameTo(dest)) { |
| throw new IOException("Committing file failed, could not rename " + src + " -> " + dest); |
| } |
| } |
| catch (FileAlreadyExistsException e) { |
| throw new IOException("Committing file failed. Target file already exists: " + dest); |
| } |
| } |
| |
| @Override |
| public void commitAfterRecovery() throws IOException { |
| final File src = recoverable.tempFile(); |
| final File dest = recoverable.targetFile(); |
| final long expectedLength = recoverable.offset(); |
| |
| if (src.exists()) { |
| if (src.length() > expectedLength) { |
| // can happen if we co from persist to recovering for commit directly |
| // truncate the trailing junk away |
| try (FileOutputStream fos = new FileOutputStream(src, true)) { |
| fos.getChannel().truncate(expectedLength); |
| } |
| } else if (src.length() < expectedLength) { |
| throw new IOException("Missing data in tmp file: " + src); |
| } |
| |
| // source still exists, so no renaming happened yet. do it! |
| Files.move(src.toPath(), dest.toPath(), StandardCopyOption.ATOMIC_MOVE); |
| } |
| else if (!dest.exists()) { |
| // neither exists - that can be a sign of |
| // - (1) a serious problem (file system loss of data) |
| // - (2) a recovery of a savepoint that is some time old and the users |
| // removed the files in the meantime. |
| |
| // TODO how to handle this? |
| // We probably need an option for users whether this should log, |
| // or result in an exception or unrecoverable exception |
| } |
| } |
| |
| @Override |
| public CommitRecoverable getRecoverable() { |
| return recoverable; |
| } |
| } |
| } |