| /** |
| * 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 java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction; |
| |
| import junit.framework.TestCase; |
| |
| /** |
| * Tests to verify safe mode correctness. |
| */ |
| public class TestSafeMode extends TestCase { |
| |
| static Log LOG = LogFactory.getLog(TestSafeMode.class); |
| |
| /** |
| * This test verifies that if SafeMode is manually entered, name-node does not |
| * come out of safe mode even after the startup safe mode conditions are met. |
| * <ol> |
| * <li>Start cluster with 1 data-node.</li> |
| * <li>Create 2 files with replication 1.</li> |
| * <li>Re-start cluster with 0 data-nodes. |
| * Name-node should stay in automatic safe-mode.</li> |
| * <li>Enter safe mode manually.</li> |
| * <li>Start the data-node.</li> |
| * <li>Wait longer than <tt>dfs.namenode.safemode.extension</tt> and |
| * verify that the name-node is still in safe mode.</li> |
| * </ol> |
| * |
| * @throws IOException |
| */ |
| public void testManualSafeMode() throws IOException { |
| MiniDFSCluster cluster = null; |
| DistributedFileSystem fs = null; |
| try { |
| Configuration conf = new HdfsConfiguration(); |
| // disable safemode extension to make the test run faster. |
| conf.set(DFSConfigKeys.DFS_NAMENODE_SAFEMODE_EXTENSION_KEY, "1"); |
| cluster = new MiniDFSCluster.Builder(conf).build(); |
| cluster.waitActive(); |
| |
| fs = (DistributedFileSystem)cluster.getFileSystem(); |
| Path file1 = new Path("/tmp/testManualSafeMode/file1"); |
| Path file2 = new Path("/tmp/testManualSafeMode/file2"); |
| |
| LOG.info("Created file1 and file2."); |
| |
| // create two files with one block each. |
| DFSTestUtil.createFile(fs, file1, 1000, (short)1, 0); |
| DFSTestUtil.createFile(fs, file2, 2000, (short)1, 0); |
| fs.close(); |
| cluster.shutdown(); |
| |
| // now bring up just the NameNode. |
| cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).format(false).build(); |
| cluster.waitActive(); |
| fs = (DistributedFileSystem)cluster.getFileSystem(); |
| |
| LOG.info("Restarted cluster with just the NameNode"); |
| |
| assertTrue("No datanode is started. Should be in SafeMode", |
| fs.setSafeMode(SafeModeAction.SAFEMODE_GET)); |
| |
| // manually set safemode. |
| fs.setSafeMode(SafeModeAction.SAFEMODE_ENTER); |
| |
| // now bring up the datanode and wait for it to be active. |
| cluster.startDataNodes(conf, 1, true, null, null); |
| cluster.waitActive(); |
| |
| LOG.info("Datanode is started."); |
| |
| // wait longer than dfs.namenode.safemode.extension |
| try { |
| Thread.sleep(2000); |
| } catch (InterruptedException ignored) {} |
| |
| assertTrue("should still be in SafeMode", |
| fs.setSafeMode(SafeModeAction.SAFEMODE_GET)); |
| |
| fs.setSafeMode(SafeModeAction.SAFEMODE_LEAVE); |
| assertFalse("should not be in SafeMode", |
| fs.setSafeMode(SafeModeAction.SAFEMODE_GET)); |
| } finally { |
| if(fs != null) fs.close(); |
| if(cluster!= null) cluster.shutdown(); |
| } |
| } |
| } |