hdfs/src/test/hdfs/org/apache/hadoop/hdfs/TestDFSUtil.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;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.Arrays;
import java.util.List;

import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
import org.apache.hadoop.fs.BlockLocation;

public class TestDFSUtil {
  /**
   * Test conversion of LocatedBlock to BlockLocation
   */
  @Test
  public void testLocatedBlocks2Locations() {
    DatanodeInfo d = new DatanodeInfo();
    DatanodeInfo[] ds = new DatanodeInfo[1];
    ds[0] = d;

    // ok
    Block b1 = new Block(1, 1, 1);
    LocatedBlock l1 = new LocatedBlock(b1, ds, 0, false);

    // corrupt
    Block b2 = new Block(2, 1, 1);
    LocatedBlock l2 = new LocatedBlock(b2, ds, 0, true);

    List<LocatedBlock> ls = Arrays.asList(l1, l2);
    LocatedBlocks lbs = new LocatedBlocks(10, false, ls, l2, true);

    BlockLocation[] bs = DFSUtil.locatedBlocks2Locations(lbs);

    assertTrue("expected 2 blocks but got " + bs.length,
               bs.length == 2);

    int corruptCount = 0;
    for (BlockLocation b: bs) {
      if (b.isCorrupt()) {
        corruptCount++;
      }
    }

    assertTrue("expected 1 corrupt files but got " + corruptCount, 
               corruptCount == 1);
    
    // test an empty location
    bs = DFSUtil.locatedBlocks2Locations(new LocatedBlocks());
    assertEquals(0, bs.length);
  }
}