| /** |
| * 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.OutputStream; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.IOUtils; |
| import org.junit.Test; |
| |
| /** |
| * Regression test for HDFS-1542, a deadlock between the main thread |
| * and the DFSOutputStream.DataStreamer thread caused because |
| * Configuration.writeXML holds a lock on itself while writing to DFS. |
| */ |
| public class TestWriteConfigurationToDFS { |
| @Test(timeout=60000) |
| public void testWriteConf() throws Exception { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 4096); |
| System.out.println("Setting conf in: " + System.identityHashCode(conf)); |
| MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build(); |
| FileSystem fs = null; |
| OutputStream os = null; |
| try { |
| fs = cluster.getFileSystem(); |
| Path filePath = new Path("/testWriteConf.xml"); |
| os = fs.create(filePath); |
| StringBuilder longString = new StringBuilder(); |
| for (int i = 0; i < 100000; i++) { |
| longString.append("hello"); |
| } // 500KB |
| conf.set("foobar", longString.toString()); |
| conf.writeXml(os); |
| os.close(); |
| os = null; |
| fs.close(); |
| fs = null; |
| } finally { |
| IOUtils.cleanup(null, os, fs); |
| cluster.shutdown(); |
| } |
| } |
| } |