| /** |
| * 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.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.client.HdfsDataInputStream; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** Test the fileLength on cluster restarts */ |
| public class TestFileLengthOnClusterRestart { |
| /** |
| * Tests the fileLength when we sync the file and restart the cluster and |
| * Datanodes not report to Namenode yet. |
| */ |
| @Test(timeout = 60000) |
| public void testFileLengthWithHSyncAndClusterRestartWithOutDNsRegister() |
| throws Exception { |
| final Configuration conf = new HdfsConfiguration(); |
| // create cluster |
| conf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 512); |
| |
| final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf) |
| .numDataNodes(2).build(); |
| HdfsDataInputStream in = null; |
| try { |
| Path path = new Path("/tmp/TestFileLengthOnClusterRestart", "test"); |
| DistributedFileSystem dfs = cluster |
| .getFileSystem(); |
| FSDataOutputStream out = dfs.create(path); |
| int fileLength = 1030; |
| out.write(new byte[fileLength]); |
| out.hsync(); |
| cluster.restartNameNode(); |
| cluster.waitActive(); |
| in = (HdfsDataInputStream) dfs.open(path, 1024); |
| // Verify the length when we just restart NN. DNs will register |
| // immediately. |
| Assert.assertEquals(fileLength, in.getVisibleLength()); |
| cluster.shutdownDataNodes(); |
| cluster.restartNameNode(false); |
| // This is just for ensuring NN started. |
| verifyNNIsInSafeMode(dfs); |
| |
| try { |
| in = (HdfsDataInputStream) dfs.open(path); |
| Assert.fail("Expected IOException"); |
| } catch (IOException e) { |
| Assert.assertTrue(e.getLocalizedMessage().indexOf( |
| "Name node is in safe mode") >= 0); |
| } |
| } finally { |
| if (null != in) { |
| in.close(); |
| } |
| cluster.shutdown(); |
| |
| } |
| } |
| |
| private void verifyNNIsInSafeMode(DistributedFileSystem dfs) |
| throws IOException { |
| while (true) { |
| try { |
| if (dfs.isInSafeMode()) { |
| return; |
| } else { |
| throw new IOException("Expected to be in SafeMode"); |
| } |
| } catch (IOException e) { |
| // NN might not started completely Ignore |
| } |
| } |
| } |
| } |