branch-2.0.4-alpha/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestHarFileSystemWithHA.java

/**
 * 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.server.namenode.ha;

import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.HarFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.junit.Test;

public class TestHarFileSystemWithHA {
  
  private static final Path TEST_HAR_PATH = new Path("/input.har");

  /**
   * Test that the HarFileSystem works with underlying HDFS URIs that have no
   * port specified, as is often the case with an HA setup.
   */
  @Test
  public void testHarUriWithHaUriWithNoPort() throws Exception {
    Configuration conf = new HdfsConfiguration();
    MiniDFSCluster cluster = null;
    try {
      cluster = new MiniDFSCluster.Builder(conf)
          .numDataNodes(1)
          .nnTopology(MiniDFSNNTopology.simpleHATopology())
          .build();
      cluster.transitionToActive(0);
      HATestUtil.setFailoverConfigurations(cluster, conf);
      
      createEmptyHarArchive(HATestUtil.configureFailoverFs(cluster, conf),
          TEST_HAR_PATH);
      
      URI failoverUri = FileSystem.getDefaultUri(conf);
      Path p = new Path("har://hdfs-" + failoverUri.getAuthority() + TEST_HAR_PATH);
      p.getFileSystem(conf);
    } finally {
      cluster.shutdown();
    }
  }
  
  /**
   * Create an empty Har archive in the FileSystem fs at the Path p.
   * 
   * @param fs the file system to create the Har archive in
   * @param p the path to create the Har archive at
   * @throws IOException in the event of error
   */
  private static void createEmptyHarArchive(FileSystem fs, Path p)
      throws IOException {
    fs.mkdirs(p);
    OutputStream out = fs.create(new Path(p, "_masterindex"));
    out.write(Integer.toString(HarFileSystem.VERSION).getBytes());
    out.close();
    fs.create(new Path(p, "_index")).close();
  }
  
}