| /** |
| * 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.*; |
| import junit.framework.*; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.LocalFileSystem; |
| import org.apache.hadoop.fs.ChecksumException; |
| import org.apache.hadoop.fs.Path; |
| |
| /** |
| * A JUnit test for corrupted file handling. |
| */ |
| public class TestFileCorruption extends TestCase { |
| |
| public TestFileCorruption(String testName) { |
| super(testName); |
| } |
| |
| protected void setUp() throws Exception { |
| } |
| |
| protected void tearDown() throws Exception { |
| } |
| |
| /** check if DFS can handle corrupted blocks properly */ |
| public void testFileCorruption() throws Exception { |
| MiniDFSCluster cluster = null; |
| DFSTestUtil util = new DFSTestUtil("TestFileCorruption", 20, 3, 8*1024); |
| try { |
| Configuration conf = new Configuration(); |
| cluster = new MiniDFSCluster(conf, 3, true, null); |
| FileSystem fs = cluster.getFileSystem(); |
| util.createFiles(fs, "/srcdat"); |
| // Now deliberately remove the blocks |
| File data_dir = new File(System.getProperty("test.build.data"), |
| "dfs/data/data5/current"); |
| assertTrue("data directory does not exist", data_dir.exists()); |
| File[] blocks = data_dir.listFiles(); |
| assertTrue("Blocks do not exist in data-dir", (blocks != null) && (blocks.length > 0)); |
| for (int idx = 0; idx < blocks.length; idx++) { |
| if (!blocks[idx].getName().startsWith("blk_")) { |
| continue; |
| } |
| System.out.println("Deliberately removing file "+blocks[idx].getName()); |
| assertTrue("Cannot remove file.", blocks[idx].delete()); |
| } |
| assertTrue("Corrupted replicas not handled properly.", |
| util.checkFiles(fs, "/srcdat")); |
| util.cleanup(fs, "/srcdat"); |
| } finally { |
| if (cluster != null) { cluster.shutdown(); } |
| } |
| } |
| |
| /** check if local FS can handle corrupted blocks properly */ |
| public void testLocalFileCorruption() throws Exception { |
| Configuration conf = new Configuration(); |
| Path file = new Path(System.getProperty("test.build.data"), "corruptFile"); |
| FileSystem fs = FileSystem.getLocal(conf); |
| DataOutputStream dos = fs.create(file); |
| dos.writeBytes("original bytes"); |
| dos.close(); |
| // Now deliberately corrupt the file |
| dos = new DataOutputStream(new FileOutputStream(file.toString())); |
| dos.writeBytes("corruption"); |
| dos.close(); |
| // Now attempt to read the file |
| DataInputStream dis = fs.open(file, 512); |
| try { |
| System.out.println("A ChecksumException is expected to be logged."); |
| dis.readByte(); |
| } catch (ChecksumException ignore) { |
| //expect this exception but let any NPE get thrown |
| } |
| fs.delete(file); |
| } |
| } |