TestSafeMode.java
上传用户:quxuerui
上传日期:2018-01-08
资源大小:41811k
文件大小:3k
- /**
- * 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.FileSystem;
- import org.apache.hadoop.fs.Path;
- import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction;
- import org.apache.hadoop.hdfs.server.namenode.NameNode;
- import junit.framework.TestCase;
- /**
- * This test makes sure that if SafeMode is manually entered, NameNode does not
- * come out of safe mode even after the startup safemode conditions are met.
- */
- public class TestSafeMode extends TestCase {
-
- static Log LOG = LogFactory.getLog(TestSafeMode.class);
-
- public void testManualSafeMode() throws IOException {
- MiniDFSCluster cluster = null;
- FileSystem fs = null;
- try {
- Configuration conf = new Configuration();
- // disable safemode extension to make the test run faster.
- conf.set("dfs.safemode.extension", "1");
- cluster = new MiniDFSCluster(conf, 1, true, null);
- cluster.waitActive();
-
- fs = 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);
- cluster.shutdown();
-
- // now bring up just the NameNode.
- cluster = new MiniDFSCluster(conf, 0, false, null);
- cluster.waitActive();
-
- LOG.info("Restarted cluster with just the NameNode");
-
- NameNode namenode = cluster.getNameNode();
-
- assertTrue("No datanode is started. Should be in SafeMode",
- namenode.isInSafeMode());
-
- // manually set safemode.
- namenode.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.");
-
- try {
- Thread.sleep(2000);
- } catch (InterruptedException ignored) {}
-
- assertTrue("should still be in SafeMode", namenode.isInSafeMode());
-
- namenode.setSafeMode(SafeModeAction.SAFEMODE_LEAVE);
- assertFalse("should not be in SafeMode", namenode.isInSafeMode());
- } finally {
- if(fs != null) fs.close();
- if(cluster!= null) cluster.shutdown();
- }
- }
- }