| /** |
| * 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.metrics; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.util.Random; |
| |
| import junit.framework.TestCase; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.Options.Rename; |
| import org.apache.hadoop.hdfs.DFSTestUtil; |
| import org.apache.hadoop.hdfs.DistributedFileSystem; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.protocol.LocatedBlock; |
| import org.apache.hadoop.hdfs.server.namenode.BlockManager; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
| import org.apache.hadoop.hdfs.server.namenode.NameNode; |
| import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| |
| /** |
| * Test for metrics published by the Namenode |
| */ |
| public class TestNameNodeMetrics extends TestCase { |
| private static final Configuration CONF = new HdfsConfiguration(); |
| private static final int DFS_REPLICATION_INTERVAL = 1; |
| private static final Path TEST_ROOT_DIR_PATH = |
| new Path(System.getProperty("test.build.data", "build/test/data")); |
| |
| // Number of datanodes in the cluster |
| private static final int DATANODE_COUNT = 3; |
| static { |
| CONF.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 100); |
| CONF.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, 1); |
| CONF.setLong(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, |
| DFS_REPLICATION_INTERVAL); |
| CONF.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, |
| DFS_REPLICATION_INTERVAL); |
| } |
| |
| private MiniDFSCluster cluster; |
| private FSNamesystemMetrics metrics; |
| private DistributedFileSystem fs; |
| private Random rand = new Random(); |
| private FSNamesystem namesystem; |
| private NameNodeMetrics nnMetrics; |
| |
| private static Path getTestPath(String fileName) { |
| return new Path(TEST_ROOT_DIR_PATH, fileName); |
| } |
| |
| @Override |
| protected void setUp() throws Exception { |
| cluster = new MiniDFSCluster(CONF, DATANODE_COUNT, true, null); |
| cluster.waitActive(); |
| namesystem = cluster.getNamesystem(); |
| fs = (DistributedFileSystem) cluster.getFileSystem(); |
| metrics = namesystem.getFSNamesystemMetrics(); |
| nnMetrics = NameNode.getNameNodeMetrics(); |
| } |
| |
| @Override |
| protected void tearDown() throws Exception { |
| cluster.shutdown(); |
| } |
| |
| /** create a file with a length of <code>fileLen</code> */ |
| private void createFile(Path file, long fileLen, short replicas) throws IOException { |
| DFSTestUtil.createFile(fs, file, fileLen, replicas, rand.nextLong()); |
| } |
| |
| private void updateMetrics() throws Exception { |
| // Wait for metrics update (corresponds to dfs.replication.interval |
| // for some block related metrics to get updated) |
| Thread.sleep(1000); |
| metrics.doUpdates(null); |
| nnMetrics.doUpdates(null); |
| } |
| |
| private void readFile(FileSystem fileSys,Path name) throws IOException { |
| //Just read file so that getNumBlockLocations are incremented |
| DataInputStream stm = fileSys.open(name); |
| byte [] buffer = new byte[4]; |
| stm.read(buffer,0,4); |
| stm.close(); |
| } |
| |
| /** Test metrics associated with addition of a file */ |
| public void testFileAdd() throws Exception { |
| // Add files with 100 blocks |
| final Path file = getTestPath("testFileAdd"); |
| createFile(file, 3200, (short)3); |
| final int blockCount = 32; |
| int blockCapacity = namesystem.getBlockCapacity(); |
| updateMetrics(); |
| assertEquals(blockCapacity, metrics.blockCapacity.get()); |
| |
| // File create operations is 1 |
| // Number of files created is depth of <code>file</code> path |
| assertEquals(1, nnMetrics.numCreateFileOps.getPreviousIntervalValue()); |
| assertEquals(file.depth(), nnMetrics.numFilesCreated.getPreviousIntervalValue()); |
| |
| // Blocks are stored in a hashmap. Compute its capacity, which |
| // doubles every time the number of entries reach the threshold. |
| int threshold = (int)(blockCapacity * BlockManager.DEFAULT_MAP_LOAD_FACTOR); |
| while (threshold < blockCount) { |
| blockCapacity <<= 1; |
| } |
| updateMetrics(); |
| int filesTotal = file.depth() + 1; // Add 1 for root |
| assertEquals(filesTotal, metrics.filesTotal.get()); |
| assertEquals(blockCount, metrics.blocksTotal.get()); |
| assertEquals(blockCapacity, metrics.blockCapacity.get()); |
| fs.delete(file, true); |
| filesTotal--; // reduce the filecount for deleted file |
| |
| // Wait for more than DATANODE_COUNT replication intervals to ensure all |
| // the blocks pending deletion are sent for deletion to the datanodes. |
| Thread.sleep(DFS_REPLICATION_INTERVAL * (DATANODE_COUNT + 1) * 1000); |
| updateMetrics(); |
| assertEquals(filesTotal, metrics.filesTotal.get()); |
| assertEquals(0, metrics.blocksTotal.get()); |
| assertEquals(0, metrics.pendingDeletionBlocks.get()); |
| |
| // Delete file operations and number of files deleted must be 1 |
| assertEquals(1, nnMetrics.numDeleteFileOps.getPreviousIntervalValue()); |
| assertEquals(1, nnMetrics.numFilesDeleted.getPreviousIntervalValue()); |
| } |
| |
| /** Corrupt a block and ensure metrics reflects it */ |
| public void testCorruptBlock() throws Exception { |
| // Create a file with single block with two replicas |
| final Path file = getTestPath("testCorruptBlock"); |
| createFile(file, 100, (short)2); |
| |
| // Corrupt first replica of the block |
| LocatedBlock block = NameNodeAdapter.getBlockLocations( |
| cluster.getNameNode(), file.toString(), 0, 1).get(0); |
| namesystem.markBlockAsCorrupt(block.getBlock(), block.getLocations()[0]); |
| updateMetrics(); |
| assertEquals(1, metrics.corruptBlocks.get()); |
| assertEquals(1, metrics.pendingReplicationBlocks.get()); |
| assertEquals(1, metrics.scheduledReplicationBlocks.get()); |
| fs.delete(file, true); |
| updateMetrics(); |
| assertEquals(0, metrics.corruptBlocks.get()); |
| assertEquals(0, metrics.pendingReplicationBlocks.get()); |
| assertEquals(0, metrics.scheduledReplicationBlocks.get()); |
| } |
| |
| /** Create excess blocks by reducing the replication factor for |
| * for a file and ensure metrics reflects it |
| */ |
| public void testExcessBlocks() throws Exception { |
| Path file = getTestPath("testExcessBlocks"); |
| createFile(file, 100, (short)2); |
| int totalBlocks = 1; |
| namesystem.setReplication(file.toString(), (short)1); |
| updateMetrics(); |
| assertEquals(totalBlocks, metrics.excessBlocks.get()); |
| fs.delete(file, true); |
| } |
| |
| /** Test to ensure metrics reflects missing blocks */ |
| public void testMissingBlock() throws Exception { |
| // Create a file with single block with two replicas |
| Path file = getTestPath("testMissingBlocks"); |
| createFile(file, 100, (short)1); |
| |
| // Corrupt the only replica of the block to result in a missing block |
| LocatedBlock block = NameNodeAdapter.getBlockLocations( |
| cluster.getNameNode(), file.toString(), 0, 1).get(0); |
| namesystem.markBlockAsCorrupt(block.getBlock(), block.getLocations()[0]); |
| updateMetrics(); |
| assertEquals(1, metrics.underReplicatedBlocks.get()); |
| assertEquals(1, metrics.missingBlocks.get()); |
| fs.delete(file, true); |
| updateMetrics(); |
| assertEquals(0, metrics.underReplicatedBlocks.get()); |
| } |
| |
| public void testRenameMetrics() throws Exception { |
| Path src = getTestPath("src"); |
| createFile(src, 100, (short)1); |
| Path target = getTestPath("target"); |
| createFile(target, 100, (short)1); |
| fs.rename(src, target, Rename.OVERWRITE); |
| updateMetrics(); |
| assertEquals(1, nnMetrics.numFilesRenamed.getPreviousIntervalValue()); |
| assertEquals(1, nnMetrics.numFilesDeleted.getPreviousIntervalValue()); |
| } |
| |
| /** |
| * Test numGetBlockLocations metric |
| * |
| * Test initiates and performs file operations (create,read,close,open file ) |
| * which results in metrics changes. These metrics changes are updated and |
| * tested for correctness. |
| * |
| * create file operation does not increment numGetBlockLocation |
| * one read file operation increments numGetBlockLocation by 1 |
| * |
| * @throws IOException in case of an error |
| */ |
| public void testGetBlockLocationMetric() throws Exception{ |
| Path file1_Path = new Path(TEST_ROOT_DIR_PATH, "file1.dat"); |
| |
| // When cluster starts first time there are no file (read,create,open) |
| // operations so metric numGetBlockLocations should be 0. |
| // Verify that numGetBlockLocations for current interval |
| // and previous interval are 0 |
| assertEquals("numGetBlockLocations for previous interval is incorrect", |
| 0,nnMetrics.numGetBlockLocations.getPreviousIntervalValue()); |
| assertEquals("numGetBlockLocations for current interval is incorrect", |
| 0,nnMetrics.numGetBlockLocations.getCurrentIntervalValue()); |
| |
| //Perform create file operation |
| createFile(file1_Path,100,(short)2); |
| updateMetrics(); |
| |
| //Create file does not change numGetBlockLocations metric |
| //expect numGetBlockLocations = 0 for previous and current interval |
| assertEquals("numGetBlockLocations for previous interval is incorrect", |
| 0,nnMetrics.numGetBlockLocations.getPreviousIntervalValue()); |
| // Verify numGetBlockLocations for current interval is 0 |
| assertEquals("numGetBlockLocations for current interval is incorrect", |
| 0,nnMetrics.numGetBlockLocations.getCurrentIntervalValue()); |
| |
| // Open and read file operation increments numGetBlockLocations |
| // Perform read file operation on earlier created file |
| readFile(fs, file1_Path); |
| updateMetrics(); |
| // Verify read file operation has incremented numGetBlockLocations by 1 |
| assertEquals("numGetBlockLocations for previous interval is incorrect", |
| 1,nnMetrics.numGetBlockLocations.getPreviousIntervalValue()); |
| // Verify numGetBlockLocations for current interval is 0 |
| assertEquals("numGetBlockLocations for current interval is incorrect", |
| 0,nnMetrics.numGetBlockLocations.getCurrentIntervalValue()); |
| |
| // opening and reading file twice will increment numGetBlockLocations by 2 |
| readFile(fs, file1_Path); |
| readFile(fs, file1_Path); |
| updateMetrics(); |
| assertEquals("numGetBlockLocations for previous interval is incorrect", |
| 2,nnMetrics.numGetBlockLocations.getPreviousIntervalValue()); |
| // Verify numGetBlockLocations for current interval is 0 |
| assertEquals("numGetBlockLocations for current interval is incorrect", |
| 0,nnMetrics.numGetBlockLocations.getCurrentIntervalValue()); |
| |
| // Verify total load metrics, total load = Data Node started. |
| updateMetrics(); |
| assertEquals("Metrics TotalLoad is incorrect" |
| ,DATANODE_COUNT,metrics.totalLoad.get()); |
| } |
| } |