| /** |
| * 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 junit.framework.TestCase; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.util.Random; |
| |
| /** This test makes sure that "DU" does not get to run on each call to getUsed */ |
| public class TestDU extends TestCase { |
| final static private File DU_DIR = new File( |
| System.getProperty("test.build.data","/tmp"), "dutmp"); |
| |
| public void setUp() throws IOException { |
| FileUtil.fullyDelete(DU_DIR); |
| assertTrue(DU_DIR.mkdirs()); |
| } |
| |
| public void tearDown() throws IOException { |
| FileUtil.fullyDelete(DU_DIR); |
| } |
| |
| private void createFile(File newFile, int size) throws IOException { |
| // write random data so that filesystems with compression enabled (e.g., ZFS) |
| // can't compress the file |
| Random random = new Random(); |
| byte[] data = new byte[size]; |
| random.nextBytes(data); |
| |
| newFile.createNewFile(); |
| RandomAccessFile file = new RandomAccessFile(newFile, "rws"); |
| |
| file.write(data); |
| |
| file.getFD().sync(); |
| file.close(); |
| } |
| |
| /** |
| * Verify that du returns expected used space for a file. |
| * We assume here that if a file system crates a file of size |
| * that is a multiple of the block size in this file system, |
| * then the used size for the file will be exactly that size. |
| * This is true for most file systems. |
| * |
| * @throws IOException |
| * @throws InterruptedException |
| */ |
| public void testDU() throws IOException, InterruptedException { |
| int writtenSize = 32*1024; // writing 32K |
| File file = new File(DU_DIR, "data"); |
| createFile(file, writtenSize); |
| |
| Thread.sleep(5000); // let the metadata updater catch up |
| |
| DU du = new DU(file, 10000); |
| du.start(); |
| long duSize = du.getUsed(); |
| du.shutdown(); |
| |
| assertEquals(writtenSize, duSize); |
| |
| //test with 0 interval, will not launch thread |
| du = new DU(file, 0); |
| du.start(); |
| duSize = du.getUsed(); |
| du.shutdown(); |
| |
| assertEquals(writtenSize, duSize); |
| |
| //test without launching thread |
| du = new DU(file, 10000); |
| duSize = du.getUsed(); |
| |
| assertEquals(writtenSize, duSize); |
| } |
| } |