Add the missing test file to HDFS-2477.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1197801 13f79535-47bb-0310-9956-ffa450edef68
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Hairong Kuang
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.blockmanagement;
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import org.junit.Test;
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import static org.junit.Assert.*;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.Random;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.hdfs.protocol.Block;
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import org.apache.hadoop.hdfs.server.common.GenerationStamp;
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import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
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/**
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* This class provides tests for BlockInfo class, which is used in BlocksMap.
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* The test covers BlockList.listMoveToHead, used for faster block report
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* processing in DatanodeDescriptor.reportDiff.
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*/
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public class TestBlockInfo {
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private static final Log LOG = LogFactory
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.getLog("org.apache.hadoop.hdfs.TestBlockInfo");
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@Test
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public void testBlockListMoveToHead() throws Exception {
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LOG.info("BlockInfo moveToHead tests...");
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final int MAX_BLOCKS = 10;
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DatanodeDescriptor dd = new DatanodeDescriptor();
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ArrayList<Block> blockList = new ArrayList<Block>(MAX_BLOCKS);
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ArrayList<BlockInfo> blockInfoList = new ArrayList<BlockInfo>();
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int headIndex;
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int curIndex;
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LOG.info("Building block list...");
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for (int i = 0; i < MAX_BLOCKS; i++) {
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blockList.add(new Block(i, 0, GenerationStamp.FIRST_VALID_STAMP));
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blockInfoList.add(new BlockInfo(blockList.get(i), 3));
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dd.addBlock(blockInfoList.get(i));
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// index of the datanode should be 0
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assertEquals("Find datanode should be 0", 0, blockInfoList.get(i)
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.findDatanode(dd));
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}
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// list length should be equal to the number of blocks we inserted
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LOG.info("Checking list length...");
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assertEquals("Length should be MAX_BLOCK", MAX_BLOCKS, dd.numBlocks());
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Iterator<BlockInfo> it = dd.getBlockIterator();
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int len = 0;
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while (it.hasNext()) {
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it.next();
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len++;
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}
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assertEquals("There should be MAX_BLOCK blockInfo's", MAX_BLOCKS, len);
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headIndex = dd.getHead().findDatanode(dd);
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LOG.info("Moving each block to the head of the list...");
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for (int i = 0; i < MAX_BLOCKS; i++) {
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curIndex = blockInfoList.get(i).findDatanode(dd);
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headIndex = dd.moveBlockToHead(blockInfoList.get(i), curIndex, headIndex);
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// the moved element must be at the head of the list
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assertEquals("Block should be at the head of the list now.",
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blockInfoList.get(i), dd.getHead());
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}
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// move head of the list to the head - this should not change the list
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LOG.info("Moving head to the head...");
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BlockInfo temp = dd.getHead();
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curIndex = 0;
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headIndex = 0;
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dd.moveBlockToHead(temp, curIndex, headIndex);
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assertEquals(
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"Moving head to the head of the list shopuld not change the list",
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temp, dd.getHead());
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// check all elements of the list against the original blockInfoList
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LOG.info("Checking elements of the list...");
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temp = dd.getHead();
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assertNotNull("Head should not be null", temp);
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int c = MAX_BLOCKS - 1;
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while (temp != null) {
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assertEquals("Expected element is not on the list",
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blockInfoList.get(c--), temp);
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temp = temp.getNext(0);
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}
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LOG.info("Moving random blocks to the head of the list...");
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headIndex = dd.getHead().findDatanode(dd);
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Random rand = new Random();
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for (int i = 0; i < MAX_BLOCKS; i++) {
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int j = rand.nextInt(MAX_BLOCKS);
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curIndex = blockInfoList.get(j).findDatanode(dd);
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headIndex = dd.moveBlockToHead(blockInfoList.get(j), curIndex, headIndex);
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// the moved element must be at the head of the list
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assertEquals("Block should be at the head of the list now.",
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blockInfoList.get(j), dd.getHead());
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}
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}
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}
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