org.apache.hadoop.hdfs.tools.snapshot.LsSnapshottableDir Maven / Gradle / Ivy
/**
* 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.hadoop.hdfs.tools.snapshot;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
/**
* A tool used to list all snapshottable directories that are owned by the
* current user. The tool returns all the snapshottable directories if the user
* is a super user.
*/
@InterfaceAudience.Private
public class LsSnapshottableDir extends Configured implements Tool {
@Override
public int run(String[] argv) throws Exception {
String description = "hdfs lsSnapshottableDir: \n" +
"\tGet the list of snapshottable directories that are owned by the current user.\n" +
"\tReturn all the snapshottable directories if the current user is a super user.\n";
if(argv.length != 0) {
System.err.println("Usage: \n" + description);
return 1;
}
FileSystem fs = FileSystem.get(getConf());
if (! (fs instanceof DistributedFileSystem)) {
System.err.println(
"LsSnapshottableDir can only be used in DistributedFileSystem");
return 1;
}
DistributedFileSystem dfs = (DistributedFileSystem) fs;
try {
SnapshottableDirectoryStatus[] stats = dfs.getSnapshottableDirListing();
SnapshottableDirectoryStatus.print(stats, System.out);
} catch (IOException e) {
String[] content = e.getLocalizedMessage().split("\n");
System.err.println("lsSnapshottableDir: " + content[0]);
return 1;
}
return 0;
}
public static void main(String[] argv) throws Exception {
int rc = ToolRunner.run(new LsSnapshottableDir(), argv);
System.exit(rc);
}
}