| /** |
| * 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.dfs; |
| |
| import java.io.IOException; |
| import java.net.URI; |
| import java.util.Random; |
| import junit.framework.TestCase; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| /** |
| */ |
| 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 static Configuration conf = new Configuration(); |
| |
| 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; } |
| } |
| |
| 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++) { |
| Path fPath = new Path(root, files[idx].getName()); |
| if (!fs.mkdirs(fPath.getParent())) { |
| throw new IOException("Mkdirs failed to create " + |
| fPath.getParent().toString()); |
| } |
| FSDataOutputStream out = fs.create(fPath, replicationFactor); |
| byte[] toWrite = new byte[files[idx].getSize()]; |
| Random rb = new Random(files[idx].getSeed()); |
| rb.nextBytes(toWrite); |
| out.write(toWrite); |
| out.close(); |
| toWrite = null; |
| } |
| } |
| |
| /** check if the files have been copied correctly. */ |
| 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 |
| // |
| void waitReplication(FileSystem fs, String topdir, short value) |
| throws IOException { |
| Path root = new Path(topdir); |
| |
| /** wait for the replication factor to settle down */ |
| while (true) { |
| boolean good = true; |
| for (int idx = 0; idx < nFiles; idx++) { |
| Path fPath = new Path(root, files[idx].getName()); |
| String locs[][] = fs.getFileCacheHints(fPath, 0, Long.MAX_VALUE); |
| for (int j = 0; j < locs.length; j++) { |
| String[] loc = locs[j]; |
| if (loc.length != value) { |
| System.out.println("File " + fPath + " has replication factor " + |
| loc.length); |
| good = false; |
| break; |
| } |
| } |
| if (!good) { |
| break; |
| } |
| } |
| if (!good) { |
| try { |
| System.out.println("Waiting for replication factor to drain"); |
| Thread.sleep(1000); |
| } catch (InterruptedException e) {} |
| continue; |
| } |
| break; |
| } |
| } |
| |
| /** delete directory and everything underneath it.*/ |
| void cleanup(FileSystem fs, String topdir) throws IOException { |
| Path root = new Path(topdir); |
| fs.delete(root); |
| files = null; |
| } |
| } |