| /** |
| * 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.fs; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.util.Shell; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.IOException; |
| |
| /** Filesystem disk space usage statistics. Uses the unix 'du' program */ |
| @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) |
| @InterfaceStability.Evolving |
| public class DU extends CachingGetSpaceUsed { |
| private final DUShell duShell; |
| |
| @VisibleForTesting |
| public DU(File path, long interval, long jitter, long initialUsed) |
| throws IOException { |
| super(path, interval, jitter, initialUsed); |
| this.duShell = new DUShell(); |
| } |
| |
| public DU(CachingGetSpaceUsed.Builder builder) throws IOException { |
| this(builder.getPath(), |
| builder.getInterval(), |
| builder.getJitter(), |
| builder.getInitialUsed()); |
| } |
| |
| @Override |
| protected synchronized void refresh() { |
| try { |
| duShell.startRefresh(); |
| } catch (IOException ioe) { |
| LOG.warn("Could not get disk usage information for path {}", |
| getDirPath(), ioe); |
| } |
| } |
| |
| private final class DUShell extends Shell { |
| void startRefresh() throws IOException { |
| run(); |
| } |
| @Override |
| public String toString() { |
| return |
| "du -sk " + getDirPath() + "\n" + used.get() + "\t" + getDirPath(); |
| } |
| |
| @Override |
| protected String[] getExecString() { |
| return new String[]{"du", "-sk", getDirPath()}; |
| } |
| |
| @Override |
| protected void parseExecResult(BufferedReader lines) throws IOException { |
| String line = lines.readLine(); |
| if (line == null) { |
| throw new IOException("Expecting a line not the end of stream"); |
| } |
| String[] tokens = line.split("\t"); |
| if (tokens.length == 0) { |
| throw new IOException("Illegal du output"); |
| } |
| setUsed(Long.parseLong(tokens[0]) * 1024); |
| } |
| |
| } |
| |
| |
| public static void main(String[] args) throws Exception { |
| String path = "."; |
| if (args.length > 0) { |
| path = args[0]; |
| } |
| |
| GetSpaceUsed du = new GetSpaceUsed.Builder().setPath(new File(path)) |
| .setConf(new Configuration()) |
| .build(); |
| String duResult = du.toString(); |
| System.out.println(duResult); |
| } |
| } |