| /** |
| * 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 junit.framework.TestCase; |
| import java.io.*; |
| import java.util.Random; |
| 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; |
| |
| /** |
| * This class tests if FSOutputSummer works correctly. |
| */ |
| public class TestFSOutputSummer extends TestCase { |
| private static final long seed = 0xDEADBEEFL; |
| private static final int BYTES_PER_CHECKSUM = 10; |
| private static final int BLOCK_SIZE = 2*BYTES_PER_CHECKSUM; |
| private static final int HALF_CHUNK_SIZE = BYTES_PER_CHECKSUM/2; |
| private static final int FILE_SIZE = 2*BLOCK_SIZE-1; |
| private static final short NUM_OF_DATANODES = 2; |
| private byte[] expected = new byte[FILE_SIZE]; |
| private byte[] actual = new byte[FILE_SIZE]; |
| private FileSystem fileSys; |
| |
| /* create a file, write all data at once */ |
| private void writeFile1(Path name) throws Exception { |
| FSDataOutputStream stm = fileSys.create(name, true, |
| fileSys.getConf().getInt("io.file.buffer.size", 4096), |
| NUM_OF_DATANODES, BLOCK_SIZE); |
| stm.write(expected); |
| stm.close(); |
| checkFile(name); |
| cleanupFile(name); |
| } |
| |
| /* create a file, write data chunk by chunk */ |
| private void writeFile2(Path name) throws Exception { |
| FSDataOutputStream stm = fileSys.create(name, true, |
| fileSys.getConf().getInt("io.file.buffer.size", 4096), |
| NUM_OF_DATANODES, BLOCK_SIZE); |
| int i=0; |
| for( ;i<FILE_SIZE-BYTES_PER_CHECKSUM; i+=BYTES_PER_CHECKSUM) { |
| stm.write(expected, i, BYTES_PER_CHECKSUM); |
| } |
| stm.write(expected, i, FILE_SIZE-3*BYTES_PER_CHECKSUM); |
| stm.close(); |
| checkFile(name); |
| cleanupFile(name); |
| } |
| |
| /* create a file, write data with vairable amount of data */ |
| private void writeFile3(Path name) throws Exception { |
| FSDataOutputStream stm = fileSys.create(name, true, |
| fileSys.getConf().getInt("io.file.buffer.size", 4096), |
| NUM_OF_DATANODES, BLOCK_SIZE); |
| stm.write(expected, 0, HALF_CHUNK_SIZE); |
| stm.write(expected, HALF_CHUNK_SIZE, BYTES_PER_CHECKSUM+2); |
| stm.write(expected, HALF_CHUNK_SIZE+BYTES_PER_CHECKSUM+2, 2); |
| stm.write(expected, HALF_CHUNK_SIZE+BYTES_PER_CHECKSUM+4, HALF_CHUNK_SIZE); |
| stm.write(expected, BLOCK_SIZE+4, BYTES_PER_CHECKSUM-4); |
| stm.write(expected, BLOCK_SIZE+BYTES_PER_CHECKSUM, |
| FILE_SIZE-3*BYTES_PER_CHECKSUM); |
| stm.close(); |
| checkFile(name); |
| cleanupFile(name); |
| } |
| private void checkAndEraseData(byte[] actual, int from, byte[] expected, |
| String message) throws Exception { |
| for (int idx = 0; idx < actual.length; idx++) { |
| assertEquals(message+" byte "+(from+idx)+" differs. expected "+ |
| expected[from+idx]+" actual "+actual[idx], |
| actual[idx], expected[from+idx]); |
| actual[idx] = 0; |
| } |
| } |
| |
| private void checkFile(Path name) throws Exception { |
| FSDataInputStream stm = fileSys.open(name); |
| // do a sanity check. Read the file |
| stm.readFully(0, actual); |
| checkAndEraseData(actual, 0, expected, "Read Sanity Test"); |
| stm.close(); |
| } |
| |
| private void cleanupFile(Path name) throws IOException { |
| assertTrue(fileSys.exists(name)); |
| fileSys.delete(name, true); |
| assertTrue(!fileSys.exists(name)); |
| } |
| |
| /** |
| * Test write opeation for output stream in DFS. |
| */ |
| public void testFSOutputSummer() throws Exception { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCK_SIZE); |
| conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, BYTES_PER_CHECKSUM); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf) |
| .numDataNodes(NUM_OF_DATANODES) |
| .build(); |
| fileSys = cluster.getFileSystem(); |
| try { |
| Path file = new Path("try.dat"); |
| Random rand = new Random(seed); |
| rand.nextBytes(expected); |
| writeFile1(file); |
| writeFile2(file); |
| writeFile3(file); |
| } finally { |
| fileSys.close(); |
| cluster.shutdown(); |
| } |
| } |
| } |