/**
* 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 java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.Shell;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;
import org.junit.Test;
import static org.junit.Assert.*;
/** This test LocalDirAllocator works correctly;
* Every test case uses different buffer dirs to
* enforce the AllocatorPerContext initialization.
* This test does not run on Cygwin because under Cygwin
* a directory can be created in a read-only directory
* which breaks this test.
*/
@RunWith(Parameterized.class)
public class TestLocalDirAllocator {
final static private Configuration conf = new Configuration();
final static private String BUFFER_DIR_ROOT = "build/test/temp";
final static private String ABSOLUTE_DIR_ROOT;
final static private String QUALIFIED_DIR_ROOT;
final static private Path BUFFER_PATH_ROOT = new Path(BUFFER_DIR_ROOT);
final static private File BUFFER_ROOT = new File(BUFFER_DIR_ROOT);
final static private String CONTEXT = "fs.client.buffer.dir";
final static private String FILENAME = "block";
final static private LocalDirAllocator dirAllocator =
new LocalDirAllocator(CONTEXT);
static LocalFileSystem localFs;
final static private boolean isWindows =
System.getProperty("os.name").startsWith("Windows");
final static int SMALL_FILE_SIZE = 100;
final static private String RELATIVE = "/RELATIVE";
final static private String ABSOLUTE = "/ABSOLUTE";
final static private String QUALIFIED = "/QUALIFIED";
final private String ROOT;
final private String PREFIX;
static {
try {
localFs = FileSystem.getLocal(conf);
rmBufferDirs();
} catch(IOException e) {
System.out.println(e.getMessage());
e.printStackTrace();
System.exit(-1);
}
ABSOLUTE_DIR_ROOT = new Path(localFs.getWorkingDirectory(),
BUFFER_DIR_ROOT).toUri().getPath();
QUALIFIED_DIR_ROOT = new Path(localFs.getWorkingDirectory(),
BUFFER_DIR_ROOT).toUri().toString();
}
public TestLocalDirAllocator(String root, String prefix) {
ROOT = root;
PREFIX = prefix;
}
@Parameters
public static Collection<Object[]> params() {
Object [][] data = new Object[][] {
{ BUFFER_DIR_ROOT, RELATIVE },
{ ABSOLUTE_DIR_ROOT, ABSOLUTE },
{ QUALIFIED_DIR_ROOT, QUALIFIED }
};
return Arrays.asList(data);
}
private static void rmBufferDirs() throws IOException {
assertTrue(!localFs.exists(BUFFER_PATH_ROOT) ||
localFs.delete(BUFFER_PATH_ROOT, true));
}
private static void validateTempDirCreation(String dir) throws IOException {
File result = createTempFile(SMALL_FILE_SIZE);
assertTrue("Checking for " + dir + " in " + result + " - FAILED!",
result.getPath().startsWith(new Path(dir, FILENAME).toUri().getPath()));
}
private static File createTempFile() throws IOException {
return createTempFile(-1);
}
private static File createTempFile(long size) throws IOException {
File result = dirAllocator.createTmpFileForWrite(FILENAME, size, conf);
result.delete();
return result;
}
private String buildBufferDir(String dir, int i) {
return dir + PREFIX + i;
}
/** Two buffer dirs. The first dir does not exist & is on a read-only disk;
* The second dir exists & is RW
* @throws Exception
*/
@Test
public void test0() throws Exception {
if (isWindows) return;
String dir0 = buildBufferDir(ROOT, 0);
String dir1 = buildBufferDir(ROOT, 1);
try {
conf.set(CONTEXT, dir0 + "," + dir1);
assertTrue(localFs.mkdirs(new Path(dir1)));
BUFFER_ROOT.setReadOnly();
validateTempDirCreation(dir1);
validateTempDirCreation(dir1);
} finally {
Shell.execCommand(new String[]{"chmod", "u+w", BUFFER_DIR_ROOT});
rmBufferDirs();
}
}
/** Two buffer dirs. The first dir exists & is on a read-only disk;
* The second dir exists & is RW
* @throws Exception
*/
@Test
public void test1() throws Exception {
if (isWindows) return;
String dir1 = buildBufferDir(ROOT, 1);
String dir2 = buildBufferDir(ROOT, 2);
try {
conf.set(CONTEXT, dir1 + "," + dir2);
assertTrue(localFs.mkdirs(new Path(dir2)));
BUFFER_ROOT.setReadOnly();
validateTempDirCreation(dir2);
validateTempDirCreation(dir2);
} finally {
Shell.execCommand(new String[]{"chmod", "u+w", BUFFER_DIR_ROOT});
rmBufferDirs();
}
}
/** Two buffer dirs. Both do not exist but on a RW disk.
* Check if tmp dirs are allocated in a round-robin
*/
@Test
public void test2() throws Exception {
if (isWindows) return;
String dir2 = buildBufferDir(ROOT, 2);
String dir3 = buildBufferDir(ROOT, 3);
try {
conf.set(CONTEXT, dir2 + "," + dir3);
// create the first file, and then figure the round-robin sequence
createTempFile(SMALL_FILE_SIZE);
int firstDirIdx = (dirAllocator.getCurrentDirectoryIndex() == 0) ? 2 : 3;
int secondDirIdx = (firstDirIdx == 2) ? 3 : 2;
// check if tmp dirs are allocated in a round-robin manner
validateTempDirCreation(buildBufferDir(ROOT, firstDirIdx));
validateTempDirCreation(buildBufferDir(ROOT, secondDirIdx));
validateTempDirCreation(buildBufferDir(ROOT, firstDirIdx));
} finally {
rmBufferDirs();
}
}
/** Two buffer dirs. Both exists and on a R/W disk.
* Later disk1 becomes read-only.
* @throws Exception
*/
@Test
public void test3() throws Exception {
if (isWindows) return;
String dir3 = buildBufferDir(ROOT, 3);
String dir4 = buildBufferDir(ROOT, 4);
try {
conf.set(CONTEXT, dir3 + "," + dir4);
assertTrue(localFs.mkdirs(new Path(dir3)));
assertTrue(localFs.mkdirs(new Path(dir4)));
// Create the first small file
createTempFile(SMALL_FILE_SIZE);
// Determine the round-robin sequence
int nextDirIdx = (dirAllocator.getCurrentDirectoryIndex() == 0) ? 3 : 4;
validateTempDirCreation(buildBufferDir(ROOT, nextDirIdx));
// change buffer directory 2 to be read only
new File(new Path(dir4).toUri().getPath()).setReadOnly();
validateTempDirCreation(dir3);
validateTempDirCreation(dir3);
} finally {
rmBufferDirs();
}
}
/**
* Two buffer dirs, on read-write disk.
*
* Try to create a whole bunch of files.
* Verify that they do indeed all get created where they should.
*
* Would ideally check statistical properties of distribution, but
* we don't have the nerve to risk false-positives here.
*
* @throws Exception
*/
static final int TRIALS = 100;
@Test
public void test4() throws Exception {
if (isWindows) return;
String dir5 = buildBufferDir(ROOT, 5);
String dir6 = buildBufferDir(ROOT, 6);
try {
conf.set(CONTEXT, dir5 + "," + dir6);
assertTrue(localFs.mkdirs(new Path(dir5)));
assertTrue(localFs.mkdirs(new Path(dir6)));
int inDir5=0, inDir6=0;
for(int i = 0; i < TRIALS; ++i) {
File result = createTempFile();
if(result.getPath().startsWith(
new Path(dir5, FILENAME).toUri().getPath())) {
inDir5++;
} else if(result.getPath().startsWith(
new Path(dir6, FILENAME).toUri().getPath())) {
inDir6++;
}
result.delete();
}
assertTrue(inDir5 + inDir6 == TRIALS);
} finally {
rmBufferDirs();
}
}
/** Two buffer dirs. The first dir does not exist & is on a read-only disk;
* The second dir exists & is RW
* getLocalPathForWrite with checkAccess set to false should create a parent
* directory. With checkAccess true, the directory should not be created.
* @throws Exception
*/
@Test
public void testLocalPathForWriteDirCreation() throws IOException {
String dir0 = buildBufferDir(ROOT, 0);
String dir1 = buildBufferDir(ROOT, 1);
try {
conf.set(CONTEXT, dir0 + "," + dir1);
assertTrue(localFs.mkdirs(new Path(dir1)));
BUFFER_ROOT.setReadOnly();
Path p1 =
dirAllocator.getLocalPathForWrite("p1/x", SMALL_FILE_SIZE, conf);
assertTrue(localFs.getFileStatus(p1.getParent()).isDirectory());
Path p2 =
dirAllocator.getLocalPathForWrite("p2/x", SMALL_FILE_SIZE, conf,
false);
try {
localFs.getFileStatus(p2.getParent());
} catch (Exception e) {
assertEquals(e.getClass(), FileNotFoundException.class);
}
} finally {
Shell.execCommand(new String[] { "chmod", "u+w", BUFFER_DIR_ROOT });
rmBufferDirs();
}
}
/** Test no side effect files are left over. After creating a temp
* temp file, remove both the temp file and its parent. Verify that
* no files or directories are left over as can happen when File objects
* are mistakenly created from fully qualified path strings.
* @throws IOException
*/
@Test
public void testNoSideEffects() throws IOException {
if (isWindows) return;
String dir = buildBufferDir(ROOT, 0);
try {
conf.set(CONTEXT, dir);
File result = dirAllocator.createTmpFileForWrite(FILENAME, -1, conf);
assertTrue(result.delete());
assertTrue(result.getParentFile().delete());
assertFalse(new File(dir).exists());
} finally {
Shell.execCommand(new String[]{"chmod", "u+w", BUFFER_DIR_ROOT});
rmBufferDirs();
}
}
}