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/*
* 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.runtime.io.disk;
import org.apache.flink.runtime.io.disk.iomanager.FileIOChannel.Enumerator;
import org.apache.flink.runtime.io.disk.iomanager.FileIOChannel.ID;
import org.apache.flink.util.FileUtils;
import org.apache.flink.util.IOUtils;
import org.apache.flink.util.ShutdownHookUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Collectors;
import static org.apache.flink.util.Preconditions.checkArgument;
import static org.apache.flink.util.Preconditions.checkNotNull;
import static org.apache.flink.util.Preconditions.checkState;
/** The manager used for creating/deleting file channels based on config temp dirs. */
public class FileChannelManagerImpl implements FileChannelManager {
private static final Logger LOG = LoggerFactory.getLogger(FileChannelManagerImpl.class);
/** The temporary directories for files. */
private final File[] paths;
/** A random number generator for the anonymous Channel IDs. */
private final Random random;
/** The number of the next path to use. */
private volatile int nextPath;
/** Prefix of the temporary directories to create. */
private final String prefix;
/**
* Flag to signal that the file channel manager has been shutdown already. The flag should
* support concurrent access for cases like multiple shutdown hooks.
*/
private final AtomicBoolean isShutdown = new AtomicBoolean();
/** Shutdown hook to make sure that the directories are removed on exit. */
private final Thread shutdownHook;
public FileChannelManagerImpl(String[] tempDirs, String prefix) {
checkNotNull(tempDirs, "The temporary directories must not be null.");
checkArgument(tempDirs.length > 0, "The temporary directories must not be empty.");
this.random = new Random();
this.nextPath = 0;
this.prefix = prefix;
shutdownHook =
ShutdownHookUtil.addShutdownHook(
this, String.format("%s-%s", getClass().getSimpleName(), prefix), LOG);
// Creates directories after registering shutdown hook to ensure the directories can be
// removed if required.
this.paths = createFiles(tempDirs, prefix);
}
private static File[] createFiles(String[] tempDirs, String prefix) {
File[] files = new File[tempDirs.length];
for (int i = 0; i < tempDirs.length; i++) {
File baseDir = new File(tempDirs[i]);
String subfolder = String.format("flink-%s-%s", prefix, UUID.randomUUID().toString());
File storageDir = new File(baseDir, subfolder);
if (!storageDir.exists() && !storageDir.mkdirs()) {
throw new RuntimeException(
"Could not create storage directory for FileChannelManager: "
+ storageDir.getAbsolutePath());
}
files[i] = storageDir;
LOG.info(
"FileChannelManager uses directory {} for spill files.",
storageDir.getAbsolutePath());
}
return files;
}
@Override
public ID createChannel() {
checkState(!isShutdown.get(), "File channel manager has shutdown.");
int num = getNextPathNum();
return new ID(paths[num], num, random);
}
@Override
public Enumerator createChannelEnumerator() {
checkState(!isShutdown.get(), "File channel manager has shutdown.");
return new Enumerator(paths, random);
}
@Override
public File[] getPaths() {
checkState(!isShutdown.get(), "File channel manager has shutdown.");
return Arrays.copyOf(paths, paths.length);
}
/** Remove all the temp directories. */
@Override
public void close() throws Exception {
// Marks shutdown and exits if it has already shutdown.
if (!isShutdown.compareAndSet(false, true)) {
return;
}
IOUtils.closeAll(
Arrays.stream(paths)
.filter(File::exists)
.map(FileChannelManagerImpl::getFileCloser)
.collect(Collectors.toList()));
ShutdownHookUtil.removeShutdownHook(
shutdownHook, String.format("%s-%s", getClass().getSimpleName(), prefix), LOG);
}
private static AutoCloseable getFileCloser(File path) {
return () -> {
try {
FileUtils.deleteDirectory(path);
LOG.info(
"FileChannelManager removed spill file directory {}",
path.getAbsolutePath());
} catch (IOException e) {
String errorMessage =
String.format(
"FileChannelManager failed to properly clean up temp file directory: %s",
path);
throw new IOException(errorMessage, e);
}
};
}
private int getNextPathNum() {
int next = nextPath;
int newNext = next + 1;
nextPath = newNext >= paths.length ? 0 : newNext;
return next;
}
}
