| /** |
| * 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.blockmanagement; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.DFSTestUtil; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.protocol.Block; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlock; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
| import org.junit.Test; |
| |
| import static org.hamcrest.CoreMatchers.is; |
| import static org.junit.Assert.*; |
| import static org.mockito.Mockito.*; |
| |
| /** |
| * Tests the sequential block ID generation mechanism and block ID |
| * collision handling. |
| */ |
| public class TestSequentialBlockId { |
| private static final Logger LOG = |
| LoggerFactory.getLogger("TestSequentialBlockId"); |
| |
| final int BLOCK_SIZE = 1024; |
| final int IO_SIZE = BLOCK_SIZE; |
| final short REPLICATION = 1; |
| final long SEED = 0; |
| |
| /** |
| * Test that block IDs are generated sequentially. |
| * |
| * @throws IOException |
| */ |
| @Test |
| public void testBlockIdGeneration() throws IOException { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setInt(DFSConfigKeys.DFS_REPLICATION_KEY, 1); |
| MiniDFSCluster cluster = |
| new MiniDFSCluster.Builder(conf).numDataNodes(1).build(); |
| |
| try { |
| cluster.waitActive(); |
| FileSystem fs = cluster.getFileSystem(); |
| |
| // Create a file that is 10 blocks long. |
| Path path = new Path("testBlockIdGeneration.dat"); |
| DFSTestUtil.createFile( |
| fs, path, IO_SIZE, BLOCK_SIZE * 10, BLOCK_SIZE, REPLICATION, SEED); |
| List<LocatedBlock> blocks = DFSTestUtil.getAllBlocks(fs, path); |
| LOG.info("Block0 id is " + blocks.get(0).getBlock().getBlockId()); |
| long nextBlockExpectedId = blocks.get(0).getBlock().getBlockId() + 1; |
| |
| // Ensure that the block IDs are sequentially increasing. |
| for (int i = 1; i < blocks.size(); ++i) { |
| long nextBlockId = blocks.get(i).getBlock().getBlockId(); |
| LOG.info("Block" + i + " id is " + nextBlockId); |
| assertThat(nextBlockId, is(nextBlockExpectedId)); |
| ++nextBlockExpectedId; |
| } |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| /** |
| * Test that collisions in the block ID space are handled gracefully. |
| * |
| * @throws IOException |
| */ |
| @Test |
| public void testTriggerBlockIdCollision() throws IOException { |
| Configuration conf = new HdfsConfiguration(); |
| conf.setInt(DFSConfigKeys.DFS_REPLICATION_KEY, 1); |
| MiniDFSCluster cluster = |
| new MiniDFSCluster.Builder(conf).numDataNodes(1).build(); |
| |
| try { |
| cluster.waitActive(); |
| FileSystem fs = cluster.getFileSystem(); |
| FSNamesystem fsn = cluster.getNamesystem(); |
| final int blockCount = 10; |
| |
| |
| // Create a file with a few blocks to rev up the global block ID |
| // counter. |
| Path path1 = new Path("testBlockIdCollisionDetection_file1.dat"); |
| DFSTestUtil.createFile( |
| fs, path1, IO_SIZE, BLOCK_SIZE * blockCount, |
| BLOCK_SIZE, REPLICATION, SEED); |
| List<LocatedBlock> blocks1 = DFSTestUtil.getAllBlocks(fs, path1); |
| |
| |
| // Rewind the block ID counter in the name system object. This will result |
| // in block ID collisions when we try to allocate new blocks. |
| SequentialBlockIdGenerator blockIdGenerator = fsn.getBlockManager() |
| .getBlockIdManager().getBlockIdGenerator(); |
| blockIdGenerator.setCurrentValue(blockIdGenerator.getCurrentValue() - 5); |
| |
| // Trigger collisions by creating a new file. |
| Path path2 = new Path("testBlockIdCollisionDetection_file2.dat"); |
| DFSTestUtil.createFile( |
| fs, path2, IO_SIZE, BLOCK_SIZE * blockCount, |
| BLOCK_SIZE, REPLICATION, SEED); |
| List<LocatedBlock> blocks2 = DFSTestUtil.getAllBlocks(fs, path2); |
| assertThat(blocks2.size(), is(blockCount)); |
| |
| // Make sure that file2 block IDs start immediately after file1 |
| assertThat(blocks2.get(0).getBlock().getBlockId(), |
| is(blocks1.get(9).getBlock().getBlockId() + 1)); |
| |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| |
| /** |
| * Test that the block type (legacy or not) can be correctly detected |
| * based on its generation stamp. |
| * |
| * @throws IOException |
| */ |
| @Test |
| public void testBlockTypeDetection() throws IOException { |
| |
| // Setup a mock object and stub out a few routines to |
| // retrieve the generation stamp counters. |
| BlockIdManager bid = mock(BlockIdManager.class); |
| final long maxGenStampForLegacyBlocks = 10000; |
| |
| when(bid.getLegacyGenerationStampLimit()) |
| .thenReturn(maxGenStampForLegacyBlocks); |
| |
| Block legacyBlock = spy(new Block()); |
| when(legacyBlock.getGenerationStamp()) |
| .thenReturn(maxGenStampForLegacyBlocks/2); |
| |
| Block newBlock = spy(new Block()); |
| when(newBlock.getGenerationStamp()) |
| .thenReturn(maxGenStampForLegacyBlocks+1); |
| |
| // Make sure that isLegacyBlock() can correctly detect |
| // legacy and new blocks. |
| when(bid.isLegacyBlock(any(Block.class))).thenCallRealMethod(); |
| assertThat(bid.isLegacyBlock(legacyBlock), is(true)); |
| assertThat(bid.isLegacyBlock(newBlock), is(false)); |
| } |
| |
| /** |
| * Test that the generation stamp for legacy and new blocks is updated |
| * as expected. |
| * |
| * @throws IOException |
| */ |
| @Test |
| public void testGenerationStampUpdate() throws IOException { |
| // Setup a mock object and stub out a few routines to |
| // retrieve the generation stamp counters. |
| BlockIdManager bid = mock(BlockIdManager.class); |
| final long nextLegacyGenerationStamp = 5000; |
| final long nextGenerationStamp = 20000; |
| |
| when(bid.getNextLegacyGenerationStamp()) |
| .thenReturn(nextLegacyGenerationStamp); |
| when(bid.getNextGenerationStamp()) |
| .thenReturn(nextGenerationStamp); |
| |
| // Make sure that the generation stamp is set correctly for both |
| // kinds of blocks. |
| when(bid.nextGenerationStamp(anyBoolean())).thenCallRealMethod(); |
| assertThat(bid.nextGenerationStamp(true), is(nextLegacyGenerationStamp)); |
| assertThat(bid.nextGenerationStamp(false), is(nextGenerationStamp)); |
| } |
| } |