branch-0.23.1/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestUnderReplicatedBlocks.java

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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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,
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package org.apache.hadoop.hdfs.server.blockmanagement;

import junit.framework.TestCase;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FsShell;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;

public class TestUnderReplicatedBlocks extends TestCase {
  public void testSetrepIncWithUnderReplicatedBlocks() throws Exception {
    Configuration conf = new HdfsConfiguration();
    final short REPLICATION_FACTOR = 2;
    final String FILE_NAME = "/testFile";
    final Path FILE_PATH = new Path(FILE_NAME);
    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION_FACTOR + 1).build();
    try {
      // create a file with one block with a replication factor of 2
      final FileSystem fs = cluster.getFileSystem();
      DFSTestUtil.createFile(fs, FILE_PATH, 1L, REPLICATION_FACTOR, 1L);
      DFSTestUtil.waitReplication(fs, FILE_PATH, REPLICATION_FACTOR);
      
      // remove one replica from the blocksMap so block becomes under-replicated
      // but the block does not get put into the under-replicated blocks queue
      final BlockManager bm = cluster.getNamesystem().getBlockManager();
      ExtendedBlock b = DFSTestUtil.getFirstBlock(fs, FILE_PATH);
      DatanodeDescriptor dn = bm.blocksMap.nodeIterator(b.getLocalBlock()).next();
      bm.addToInvalidates(b.getLocalBlock(), dn);
      bm.blocksMap.removeNode(b.getLocalBlock(), dn);
      
      // increment this file's replication factor
      FsShell shell = new FsShell(conf);
      assertEquals(0, shell.run(new String[]{
          "-setrep", "-w", Integer.toString(1+REPLICATION_FACTOR), FILE_NAME}));
    } finally {
      cluster.shutdown();
    }
    
  }

}