| /** |
| * 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.server.namenode; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.util.StringUtils; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| /** |
| * Test the EditLogFileOutputStream |
| */ |
| public class TestEditLogFileOutputStream { |
| private final static File TEST_DIR = |
| new File(System.getProperty("test.build.data", "/tmp")); |
| private static final File TEST_EDITS = |
| new File(TEST_DIR, "testEditLogFileOutput.log"); |
| final static int MIN_PREALLOCATION_LENGTH = |
| EditLogFileOutputStream.MIN_PREALLOCATION_LENGTH; |
| |
| static { |
| // No need to fsync for the purposes of tests. This makes |
| // the tests run much faster. |
| EditLogFileOutputStream.setShouldSkipFsyncForTesting(true); |
| } |
| |
| @Before |
| @After |
| public void deleteEditsFile() { |
| if (TEST_EDITS.exists()) TEST_EDITS.delete(); |
| } |
| |
| static void flushAndCheckLength(EditLogFileOutputStream elos, |
| long expectedLength) throws IOException { |
| elos.setReadyToFlush(); |
| elos.flushAndSync(true); |
| assertEquals(expectedLength, elos.getFile().length()); |
| } |
| |
| /** |
| * Tests writing to the EditLogFileOutputStream. Due to preallocation, the |
| * length of the edit log will usually be longer than its valid contents. |
| */ |
| @Test |
| public void testRawWrites() throws IOException { |
| EditLogFileOutputStream elos = new EditLogFileOutputStream(TEST_EDITS, 0); |
| try { |
| byte[] small = new byte[] {1,2,3,4,5,8,7}; |
| elos.create(); |
| // The first (small) write we make extends the file by 1 MB due to |
| // preallocation. |
| elos.writeRaw(small, 0, small.length); |
| flushAndCheckLength(elos, MIN_PREALLOCATION_LENGTH); |
| // The next small write we make goes into the area that was already |
| // preallocated. |
| elos.writeRaw(small, 0, small.length); |
| flushAndCheckLength(elos, MIN_PREALLOCATION_LENGTH); |
| // Now we write enough bytes so that we exceed the minimum preallocated |
| // length. |
| final int BIG_WRITE_LENGTH = 3 * MIN_PREALLOCATION_LENGTH; |
| byte[] buf = new byte[4096]; |
| for (int i = 0; i < buf.length; i++) { |
| buf[i] = 0; |
| } |
| int total = BIG_WRITE_LENGTH; |
| while (total > 0) { |
| int toWrite = (total > buf.length) ? buf.length : total; |
| elos.writeRaw(buf, 0, toWrite); |
| total -= toWrite; |
| } |
| flushAndCheckLength(elos, 4 * MIN_PREALLOCATION_LENGTH); |
| } finally { |
| if (elos != null) elos.close(); |
| } |
| } |
| |
| /** |
| * Tests EditLogFileOutputStream doesn't throw NullPointerException on |
| * close/abort sequence. See HDFS-2011. |
| */ |
| @Test |
| public void testEditLogFileOutputStreamCloseAbort() throws IOException { |
| // abort after a close should just ignore |
| EditLogFileOutputStream editLogStream = |
| new EditLogFileOutputStream(TEST_EDITS, 0); |
| editLogStream.close(); |
| editLogStream.abort(); |
| } |
| |
| /** |
| * Tests EditLogFileOutputStream doesn't throw NullPointerException on |
| * close/close sequence. See HDFS-2011. |
| */ |
| @Test |
| public void testEditLogFileOutputStreamCloseClose() throws IOException { |
| // close after a close should result in an IOE |
| EditLogFileOutputStream editLogStream = |
| new EditLogFileOutputStream(TEST_EDITS, 0); |
| editLogStream.close(); |
| try { |
| editLogStream.close(); |
| } catch (IOException ioe) { |
| String msg = StringUtils.stringifyException(ioe); |
| assertTrue(msg, msg.contains("Trying to use aborted output stream")); |
| } |
| } |
| |
| /** |
| * Tests EditLogFileOutputStream doesn't throw NullPointerException on being |
| * abort/abort sequence. See HDFS-2011. |
| */ |
| @Test |
| public void testEditLogFileOutputStreamAbortAbort() throws IOException { |
| // abort after a close should just ignore |
| EditLogFileOutputStream editLogStream = |
| new EditLogFileOutputStream(TEST_EDITS, 0); |
| editLogStream.abort(); |
| editLogStream.abort(); |
| } |
| } |