| /** |
| * 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.apex.malhar.lib.wal; |
| |
| import java.io.IOException; |
| import java.util.TreeMap; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.apache.hadoop.fs.Path; |
| |
| import com.google.common.collect.TreeMultimap; |
| |
| import com.datatorrent.netlet.util.Slice; |
| |
| /** |
| * A {@link FileSystemWAL} that WindowDataManager uses to save state of every window. |
| * |
| * @since 3.5.0 |
| */ |
| public class FSWindowReplayWAL extends FileSystemWAL |
| { |
| transient boolean readOnly; |
| |
| transient TreeMultimap<Integer, FileDescriptor> fileDescriptors = TreeMultimap.create(); |
| |
| //all the readers will read to this point while replaying. |
| transient FileSystemWALPointer walEndPointerAfterRecovery; |
| transient Slice retrievedWindow; |
| |
| transient TreeMap<Long, Integer> windowWalParts = new TreeMap<>(); |
| |
| FSWindowReplayWAL() |
| { |
| super(); |
| setInBatchMode(true); |
| setFileSystemWALWriter(new WriterThatFinalizesImmediately(this)); |
| } |
| |
| FSWindowReplayWAL(boolean readOnly) |
| { |
| this(); |
| this.readOnly = readOnly; |
| } |
| |
| @Override |
| public void setup() |
| { |
| try { |
| if (getMaxLength() == 0) { |
| setMaxLength(fileContext.getDefaultFileSystem().getServerDefaults().getBlockSize()); |
| } |
| if (!readOnly) { |
| getWriter().recover(); |
| } |
| } catch (IOException e) { |
| throw new RuntimeException("while setup"); |
| } |
| } |
| |
| public FileSystemWALPointer getWalEndPointerAfterRecovery() |
| { |
| return walEndPointerAfterRecovery; |
| } |
| |
| /** |
| * Finalizes files just after rotation. Doesn't wait for the window to be committed. |
| */ |
| static class WriterThatFinalizesImmediately extends FileSystemWAL.FileSystemWALWriter |
| { |
| |
| private WriterThatFinalizesImmediately() |
| { |
| super(); |
| } |
| |
| protected WriterThatFinalizesImmediately(@NotNull FileSystemWAL fileSystemWal) |
| { |
| super(fileSystemWal); |
| } |
| |
| /** |
| * Finalize the file immediately after rotation. |
| * @param partNum part number |
| * @throws IOException |
| */ |
| @Override |
| protected void rotated(int partNum) throws IOException |
| { |
| finalize(partNum); |
| } |
| |
| @Override |
| protected void recover() throws IOException |
| { |
| restoreActivePart(); |
| } |
| } |
| |
| static class FileDescriptor implements Comparable<FileDescriptor> |
| { |
| int part; |
| boolean isTmp; |
| long time; |
| Path filePath; |
| |
| static FileDescriptor create(Path filePath) |
| { |
| FileDescriptor descriptor = new FileDescriptor(); |
| descriptor.filePath = filePath; |
| |
| String name = filePath.getName(); |
| String[] parts = name.split("\\."); |
| |
| String[] namePart = parts[0].split("_"); |
| descriptor.part = Integer.parseInt(namePart[1]); |
| |
| if (parts.length == 3) { |
| descriptor.isTmp = true; |
| descriptor.time = Long.parseLong(parts[1]); |
| } |
| |
| return descriptor; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (!(o instanceof FileDescriptor)) { |
| return false; |
| } |
| |
| FileDescriptor that = (FileDescriptor)o; |
| |
| if (part != that.part) { |
| return false; |
| } |
| if (isTmp != that.isTmp) { |
| return false; |
| } |
| return time == that.time; |
| |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int result = part; |
| result = 31 * result + (isTmp ? 1 : 0); |
| result = 31 * result + (int)(time ^ (time >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public int compareTo(FileDescriptor o) |
| { |
| if (part < o.part) { |
| return -1; |
| } else if (part > o.part) { |
| return 1; |
| } else { |
| if (isTmp && !o.isTmp) { |
| return -1; |
| } else if (!isTmp && o.isTmp) { |
| return 1; |
| } |
| return Long.compare(time, o.time); |
| } |
| } |
| } |
| } |