hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.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;

import static org.apache.hadoop.hdfs.DFSConfigKeys.*;
import static org.junit.Assert.*;

import java.io.IOException;
import java.net.URI;
import java.util.Collection;

import org.apache.hadoop.conf.Configuration;
import org.junit.Test;

public class TestFSNamesystem {

  /**
   * Tests that the namenode edits dirs are gotten with duplicates removed
   */
  @Test
  public void testUniqueEditDirs() throws IOException {
    Configuration config = new Configuration();

    config.set(DFS_NAMENODE_EDITS_DIR_KEY, "file://edits/dir, "
        + "file://edits/dir1,file://edits/dir1"); // overlapping internally

    // getNamespaceEditsDirs removes duplicates
    Collection<URI> editsDirs = FSNamesystem.getNamespaceEditsDirs(config);
    assertEquals(2, editsDirs.size());
  }

}