/**
* 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;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Random;
import junit.framework.TestCase;
import org.apache.hadoop.hdfs.DFSClient.DFSDataInputStream;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.BlockLocation;
/**
*/
public class DFSTestUtil extends TestCase {
private static Random gen = new Random();
private static String[] dirNames = {
"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"
};
private int maxLevels;// = 3;
private int maxSize;// = 8*1024;
private int nFiles;
private MyFile[] files;
/** Creates a new instance of DFSTestUtil
*
* @param testName Name of the test from where this utility is used
* @param nFiles Number of files to be created
* @param maxLevels Maximum number of directory levels
* @param maxSize Maximum size for file
*/
public DFSTestUtil(String testName, int nFiles, int maxLevels, int maxSize) {
this.nFiles = nFiles;
this.maxLevels = maxLevels;
this.maxSize = maxSize;
}
/** class MyFile contains enough information to recreate the contents of
* a single file.
*/
private class MyFile {
private String name = "";
private int size;
private long seed;
MyFile() {
int nLevels = gen.nextInt(maxLevels);
if (nLevels != 0) {
int[] levels = new int[nLevels];
for (int idx = 0; idx < nLevels; idx++) {
levels[idx] = gen.nextInt(10);
}
StringBuffer sb = new StringBuffer();
for (int idx = 0; idx < nLevels; idx++) {
sb.append(dirNames[levels[idx]]);
sb.append("/");
}
name = sb.toString();
}
long fidx = -1;
while (fidx < 0) { fidx = gen.nextLong(); }
name = name + Long.toString(fidx);
size = gen.nextInt(maxSize);
seed = gen.nextLong();
}
String getName() { return name; }
int getSize() { return size; }
long getSeed() { return seed; }
}
public void createFiles(FileSystem fs, String topdir) throws IOException {
createFiles(fs, topdir, (short)3);
}
/** create nFiles with random names and directory hierarchies
* with random (but reproducible) data in them.
*/
void createFiles(FileSystem fs, String topdir,
short replicationFactor) throws IOException {
files = new MyFile[nFiles];
for (int idx = 0; idx < nFiles; idx++) {
files[idx] = new MyFile();
}
Path root = new Path(topdir);
for (int idx = 0; idx < nFiles; idx++) {
createFile(fs, new Path(root, files[idx].getName()), files[idx].getSize(),
replicationFactor, files[idx].getSeed());
}
}
public static void createFile(FileSystem fs, Path fileName, long fileLen,
short replFactor, long seed) throws IOException {
if (!fs.mkdirs(fileName.getParent())) {
throw new IOException("Mkdirs failed to create " +
fileName.getParent().toString());
}
FSDataOutputStream out = null;
try {
out = fs.create(fileName, replFactor);
byte[] toWrite = new byte[1024];
Random rb = new Random(seed);
long bytesToWrite = fileLen;
while (bytesToWrite>0) {
rb.nextBytes(toWrite);
int bytesToWriteNext = (1024<bytesToWrite)?1024:(int)bytesToWrite;
out.write(toWrite, 0, bytesToWriteNext);
bytesToWrite -= bytesToWriteNext;
}
out.close();
out = null;
} finally {
IOUtils.closeStream(out);
}
}
/** check if the files have been copied correctly. */
public boolean checkFiles(FileSystem fs, String topdir) throws IOException {
//Configuration conf = new Configuration();
Path root = new Path(topdir);
for (int idx = 0; idx < nFiles; idx++) {
Path fPath = new Path(root, files[idx].getName());
FSDataInputStream in = fs.open(fPath);
byte[] toRead = new byte[files[idx].getSize()];
byte[] toCompare = new byte[files[idx].getSize()];
Random rb = new Random(files[idx].getSeed());
rb.nextBytes(toCompare);
in.readFully(0, toRead);
in.close();
for (int i = 0; i < toRead.length; i++) {
if (toRead[i] != toCompare[i]) {
return false;
}
}
toRead = null;
toCompare = null;
}
return true;
}
void setReplication(FileSystem fs, String topdir, short value)
throws IOException {
Path root = new Path(topdir);
for (int idx = 0; idx < nFiles; idx++) {
Path fPath = new Path(root, files[idx].getName());
fs.setReplication(fPath, value);
}
}
// waits for the replication factor of all files to reach the
// specified target
//
public void waitReplication(FileSystem fs, String topdir, short value)
throws IOException {
Path root = new Path(topdir);
/** wait for the replication factor to settle down */
for (int idx = 0; idx < nFiles; idx++) {
waitReplication(fs, new Path(root, files[idx].getName()), value);
}
}
/** return list of filenames created as part of createFiles */
public String[] getFileNames(String topDir) {
if (nFiles == 0)
return new String[]{};
else {
String[] fileNames = new String[nFiles];
for (int idx=0; idx < nFiles; idx++) {
fileNames[idx] = topDir + "/" + files[idx].getName();
}
return fileNames;
}
}
/** wait for the file's replication to be done */
public static void waitReplication(FileSystem fs, Path fileName,
short replFactor) throws IOException {
boolean good;
do {
good = true;
BlockLocation locs[] = fs.getFileBlockLocations(
fs.getFileStatus(fileName), 0, Long.MAX_VALUE);
for (int j = 0; j < locs.length; j++) {
String[] loc = locs[j].getHosts();
if (loc.length != replFactor) {
System.out.println("File " + fileName + " has replication factor " +
loc.length);
good = false;
try {
System.out.println("Waiting for replication factor to drain");
Thread.sleep(100);
} catch (InterruptedException e) {}
break;
}
}
} while(!good);
}
/** delete directory and everything underneath it.*/
public void cleanup(FileSystem fs, String topdir) throws IOException {
Path root = new Path(topdir);
fs.delete(root, true);
files = null;
}
public static Block getFirstBlock(FileSystem fs, Path path) throws IOException {
DFSDataInputStream in =
(DFSDataInputStream) ((DistributedFileSystem)fs).open(path);
in.readByte();
return in.getCurrentBlock();
}
static void setLogLevel2All(org.apache.commons.logging.Log log) {
((org.apache.commons.logging.impl.Log4JLogger)log
).getLogger().setLevel(org.apache.log4j.Level.ALL);
}
static String readFile(File f) throws IOException {
StringBuilder b = new StringBuilder();
BufferedReader in = new BufferedReader(new FileReader(f));
for(int c; (c = in.read()) != -1; b.append((char)c));
in.close();
return b.toString();
}
// Returns url content as string.
public static String urlGet(URL url) throws IOException {
URLConnection conn = url.openConnection();
ByteArrayOutputStream out = new ByteArrayOutputStream();
IOUtils.copyBytes(conn.getInputStream(), out, 4096, true);
return out.toString();
}
}