| /** |
| * 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 java.util.EnumSet; |
| |
| import junit.framework.Assert; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.DFSOutputStream; |
| import org.apache.hadoop.hdfs.DistributedFileSystem; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.client.HdfsDataOutputStream.SyncFlag; |
| import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction; |
| import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo; |
| import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState; |
| import org.apache.hadoop.hdfs.server.namenode.LeaseManager.Lease; |
| import org.apache.hadoop.hdfs.util.MD5FileUtils; |
| import org.junit.Test; |
| |
| public class TestFSImage { |
| |
| @Test |
| public void testPersist() throws IOException { |
| Configuration conf = new Configuration(); |
| testPersistHelper(conf); |
| } |
| |
| @Test |
| public void testCompression() throws IOException { |
| Configuration conf = new Configuration(); |
| conf.setBoolean(DFSConfigKeys.DFS_IMAGE_COMPRESS_KEY, true); |
| conf.set(DFSConfigKeys.DFS_IMAGE_COMPRESSION_CODEC_KEY, |
| "org.apache.hadoop.io.compress.GzipCodec"); |
| testPersistHelper(conf); |
| } |
| |
| private void testPersistHelper(Configuration conf) throws IOException { |
| MiniDFSCluster cluster = null; |
| try { |
| cluster = new MiniDFSCluster.Builder(conf).build(); |
| cluster.waitActive(); |
| FSNamesystem fsn = cluster.getNamesystem(); |
| DistributedFileSystem fs = cluster.getFileSystem(); |
| |
| final Path dir = new Path("/abc/def"); |
| final Path file1 = new Path(dir, "f1"); |
| final Path file2 = new Path(dir, "f2"); |
| |
| // create an empty file f1 |
| fs.create(file1).close(); |
| |
| // create an under-construction file f2 |
| FSDataOutputStream out = fs.create(file2); |
| out.writeBytes("hello"); |
| ((DFSOutputStream) out.getWrappedStream()).hsync(EnumSet |
| .of(SyncFlag.UPDATE_LENGTH)); |
| |
| // checkpoint |
| fs.setSafeMode(SafeModeAction.SAFEMODE_ENTER); |
| fs.saveNamespace(); |
| fs.setSafeMode(SafeModeAction.SAFEMODE_LEAVE); |
| |
| cluster.restartNameNode(); |
| cluster.waitActive(); |
| fs = cluster.getFileSystem(); |
| |
| assertTrue(fs.isDirectory(dir)); |
| assertTrue(fs.exists(file1)); |
| assertTrue(fs.exists(file2)); |
| |
| // check internals of file2 |
| INodeFile file2Node = fsn.dir.getINode4Write(file2.toString()).asFile(); |
| assertEquals("hello".length(), file2Node.computeFileSize()); |
| assertTrue(file2Node.isUnderConstruction()); |
| BlockInfo[] blks = file2Node.getBlocks(); |
| assertEquals(1, blks.length); |
| assertEquals(BlockUCState.UNDER_CONSTRUCTION, blks[0].getBlockUCState()); |
| // check lease manager |
| Lease lease = fsn.leaseManager.getLeaseByPath(file2.toString()); |
| Assert.assertNotNull(lease); |
| } finally { |
| if (cluster != null) { |
| cluster.shutdown(); |
| } |
| } |
| } |
| |
| /** |
| * Ensure that the digest written by the saver equals to the digest of the |
| * file. |
| */ |
| @Test |
| public void testDigest() throws IOException { |
| Configuration conf = new Configuration(); |
| MiniDFSCluster cluster = null; |
| try { |
| cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build(); |
| DistributedFileSystem fs = cluster.getFileSystem(); |
| fs.setSafeMode(SafeModeAction.SAFEMODE_ENTER); |
| fs.saveNamespace(); |
| fs.setSafeMode(SafeModeAction.SAFEMODE_LEAVE); |
| File currentDir = FSImageTestUtil.getNameNodeCurrentDirs(cluster, 0).get( |
| 0); |
| File fsimage = FSImageTestUtil.findNewestImageFile(currentDir |
| .getAbsolutePath()); |
| assertEquals(MD5FileUtils.readStoredMd5ForFile(fsimage), |
| MD5FileUtils.computeMd5ForFile(fsimage)); |
| } finally { |
| if (cluster != null) { |
| cluster.shutdown(); |
| } |
| } |
| } |
| } |