/*
* 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 gobblin.data.management.trash;
import gobblin.util.Decorator;
import gobblin.util.ExecutorsUtils;
import gobblin.util.executors.ScalingThreadPoolExecutor;
import java.io.Closeable;
import java.io.IOException;
import java.util.Properties;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.security.UserGroupInformation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Optional;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
/**
* Implementation of {@link Trash} that deletes files asynchronously and in parallel.
*
* <p>
* This implementation is not built through {@link TrashFactory} because coder must be aware that the trash
* implementation is asynchronous. However, internally it uses {@link TrashFactory} to instantiate the trash
* implementation that will actually perform the deletes. This class acts as a {@link Decorator} of the
* inner trash.
* </p>
*
* <p>
* Trash methods will always return true, regardless of success of the actual trash operation. However, additional
* methods are provided to get a future for the operation.
* </p>
*/
public class AsyncTrash implements GobblinProxiedTrash, Closeable, Decorator {
public static final String MAX_DELETING_THREADS_KEY = "gobblin.trash.async.max.deleting.threads";
public static final int DEFAULT_MAX_DELETING_THREADS = 100;
private static final Logger LOGGER = LoggerFactory.getLogger(AsyncTrash.class);
private final ProxiedTrash innerTrash;
private final ListeningExecutorService executor;
public AsyncTrash(FileSystem fs, Properties properties) throws IOException {
this(fs, properties, UserGroupInformation.getCurrentUser().getShortUserName());
}
public AsyncTrash(FileSystem fs, Properties properties, String user) throws IOException {
int maxDeletingThreads = DEFAULT_MAX_DELETING_THREADS;
if (properties.containsKey(MAX_DELETING_THREADS_KEY)) {
maxDeletingThreads = Integer.parseInt(properties.getProperty(MAX_DELETING_THREADS_KEY));
}
this.innerTrash = TrashFactory.createProxiedTrash(fs, properties, user);
this.executor = ExecutorsUtils.loggingDecorator(
MoreExecutors.getExitingExecutorService(ScalingThreadPoolExecutor.newScalingThreadPool(0, maxDeletingThreads,
100, ExecutorsUtils.newThreadFactory(Optional.of(LOGGER), Optional.of("Async-trash-delete-pool-%d")))));
}
@Override
public boolean moveToTrashAsUser(Path path, String user) throws IOException {
moveToTrashAsUserFuture(path, user);
return true;
}
/**
* Schedules a {@link ProxiedTrash#moveToTrashAsUser} and returns a future for this operation.
* @param path {@link Path} to delete.
* @param user User to execute the operation as.
* @return true if operation succeeded.
*/
public ListenableFuture<Boolean> moveToTrashAsUserFuture(final Path path, final String user) {
return this.executor.submit(new Callable<Boolean>() {
@Override
public Boolean call() throws IOException {
return AsyncTrash.this.innerTrash.moveToTrashAsUser(path, user);
}
});
}
public boolean moveToTrashAsOwner(Path path) {
moveToTrashAsOwnerFuture(path);
return true;
}
/**
* Schedules a {@link ProxiedTrash#moveToTrashAsOwner} and returns a future for this operation.
* @param path {@link Path} to delete.
* @return true if operation succeeded.
*/
public ListenableFuture<Boolean> moveToTrashAsOwnerFuture(final Path path) {
return this.executor.submit(new Callable<Boolean>() {
@Override
public Boolean call() throws IOException {
return AsyncTrash.this.innerTrash.moveToTrashAsOwner(path);
}
});
}
@Override
public boolean moveToTrash(Path path) throws IOException {
moveToTrashFuture(path);
return true;
}
/**
* Schedules a {@link ProxiedTrash#moveToTrash} and returns a future for this operation.
* @param path {@link Path} to delete.
* @return true if operation succeeded.
*/
public ListenableFuture<Boolean> moveToTrashFuture(final Path path) {
return this.executor.submit(new Callable<Boolean>() {
@Override
public Boolean call() throws IOException {
return AsyncTrash.this.innerTrash.moveToTrash(path);
}
});
}
@Override
public Object getDecoratedObject() {
return this.innerTrash;
}
@Override
public void close() throws IOException {
try {
this.executor.shutdown();
this.executor.awaitTermination(5, TimeUnit.HOURS);
} catch (InterruptedException ie) {
this.executor.shutdownNow();
}
}
}