TestRestartDFS.java
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- /**
- * 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 org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.fs.FileStatus;
- import org.apache.hadoop.fs.FileSystem;
- import org.apache.hadoop.fs.Path;
- /**
- * A JUnit test for checking if restarting DFS preserves integrity.
- */
- public class TestRestartDFS extends TestCase {
- /** check if DFS remains in proper condition after a restart */
- public void testRestartDFS() throws Exception {
- final Configuration conf = new Configuration();
- MiniDFSCluster cluster = null;
- DFSTestUtil files = new DFSTestUtil("TestRestartDFS", 20, 3, 8*1024);
- final String dir = "/srcdat";
- final Path rootpath = new Path("/");
- final Path dirpath = new Path(dir);
- long rootmtime;
- FileStatus rootstatus;
- FileStatus dirstatus;
- try {
- cluster = new MiniDFSCluster(conf, 4, true, null);
- FileSystem fs = cluster.getFileSystem();
- files.createFiles(fs, dir);
- rootmtime = fs.getFileStatus(rootpath).getModificationTime();
- rootstatus = fs.getFileStatus(dirpath);
- dirstatus = fs.getFileStatus(dirpath);
- fs.setOwner(rootpath, rootstatus.getOwner() + "_XXX", null);
- fs.setOwner(dirpath, null, dirstatus.getGroup() + "_XXX");
- } finally {
- if (cluster != null) { cluster.shutdown(); }
- }
- try {
- // Here we restart the MiniDFScluster without formatting namenode
- cluster = new MiniDFSCluster(conf, 4, false, null);
- FileSystem fs = cluster.getFileSystem();
- assertTrue("Filesystem corrupted after restart.",
- files.checkFiles(fs, dir));
- final FileStatus newrootstatus = fs.getFileStatus(rootpath);
- assertEquals(rootmtime, newrootstatus.getModificationTime());
- assertEquals(rootstatus.getOwner() + "_XXX", newrootstatus.getOwner());
- assertEquals(rootstatus.getGroup(), newrootstatus.getGroup());
- final FileStatus newdirstatus = fs.getFileStatus(dirpath);
- assertEquals(dirstatus.getOwner(), newdirstatus.getOwner());
- assertEquals(dirstatus.getGroup() + "_XXX", newdirstatus.getGroup());
- files.cleanup(fs, dir);
- } finally {
- if (cluster != null) { cluster.shutdown(); }
- }
- }
- }