HDFS-6990. Add unit test for evict/delete RAM_DISK block with open handle. (Contributed by Xiaoyu Yao)
Conflicts: hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-6581.txt
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arp
Jitendra Pandey
parent
bf1b84abe1
commit
70f70f845f
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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.datanode.fsdataset.impl;
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import org.apache.commons.io.IOUtils;
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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.commons.logging.impl.Log4JLogger;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.CreateFlag;
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import org.apache.hadoop.fs.FSDataInputStream;
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import org.apache.hadoop.fs.FSDataOutputStream;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.fs.permission.FsPermission;
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import org.apache.hadoop.hdfs.*;
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import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
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import org.apache.hadoop.hdfs.protocol.LocatedBlock;
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import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
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import org.apache.hadoop.hdfs.server.datanode.DataNode;
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import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
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import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
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import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
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import org.apache.hadoop.hdfs.server.namenode.NameNode;
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import org.apache.hadoop.net.unix.DomainSocket;
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import org.apache.hadoop.net.unix.TemporarySocketDirectory;
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import org.apache.hadoop.security.UserGroupInformation;
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import org.apache.hadoop.test.GenericTestUtils;
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import org.apache.hadoop.util.NativeCodeLoader;
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import org.apache.log4j.Level;
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import org.junit.*;
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import java.io.File;
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.EnumSet;
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import java.util.List;
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import java.util.UUID;
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import static org.apache.hadoop.fs.CreateFlag.CREATE;
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import static org.apache.hadoop.fs.CreateFlag.LAZY_PERSIST;
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import static org.apache.hadoop.hdfs.DFSConfigKeys.*;
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import static org.apache.hadoop.hdfs.StorageType.DEFAULT;
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import static org.apache.hadoop.hdfs.StorageType.RAM_DISK;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.hamcrest.core.Is.is;
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import static org.junit.Assert.assertThat;
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public class TestScrLazyPersistFiles {
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public static final Log LOG = LogFactory.getLog(TestLazyPersistFiles.class);
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static {
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((Log4JLogger) NameNode.blockStateChangeLog).getLogger().setLevel(Level.ALL);
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((Log4JLogger) NameNode.stateChangeLog).getLogger().setLevel(Level.ALL);
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((Log4JLogger) FsDatasetImpl.LOG).getLogger().setLevel(Level.ALL);
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}
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private static short REPL_FACTOR = 1;
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private static final int BLOCK_SIZE = 10485760; // 10 MB
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private static final int LAZY_WRITE_FILE_SCRUBBER_INTERVAL_SEC = 3;
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private static final long HEARTBEAT_INTERVAL_SEC = 1;
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private static final int HEARTBEAT_RECHECK_INTERVAL_MSEC = 500;
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private static final int LAZY_WRITER_INTERVAL_SEC = 1;
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private static final int BUFFER_LENGTH = 4096;
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private static TemporarySocketDirectory sockDir;
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private MiniDFSCluster cluster;
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private DistributedFileSystem fs;
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private DFSClient client;
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private Configuration conf;
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@BeforeClass
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public static void init() {
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sockDir = new TemporarySocketDirectory();
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DomainSocket.disableBindPathValidation();
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}
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@AfterClass
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public static void shutdown() throws IOException {
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sockDir.close();
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}
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@Before
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public void before() {
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Assume.assumeThat(NativeCodeLoader.isNativeCodeLoaded() && !Path.WINDOWS,
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equalTo(true));
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Assume.assumeThat(DomainSocket.getLoadingFailureReason(), equalTo(null));
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}
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@After
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public void shutDownCluster() throws IOException {
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if (fs != null) {
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fs.close();
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fs = null;
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client = null;
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}
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if (cluster != null) {
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cluster.shutdownDataNodes();
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cluster.shutdown();
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cluster = null;
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}
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}
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/**
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* Read in-memory block with Short Circuit Read
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* Note: the test uses faked RAM_DISK from physical disk.
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*/
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@Test (timeout=300000)
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public void testRamDiskShortCircuitRead()
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throws IOException, InterruptedException {
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startUpCluster(REPL_FACTOR,
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new StorageType[]{RAM_DISK, DEFAULT},
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2 * BLOCK_SIZE - 1, true); // 1 replica + delta, SCR read
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final String METHOD_NAME = GenericTestUtils.getMethodName();
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final int SEED = 0xFADED;
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Path path = new Path("/" + METHOD_NAME + ".dat");
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makeRandomTestFile(path, BLOCK_SIZE, true, SEED);
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ensureFileReplicasOnStorageType(path, RAM_DISK);
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// Sleep for a short time to allow the lazy writer thread to do its job
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Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
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//assertThat(verifyReadRandomFile(path, BLOCK_SIZE, SEED), is(true));
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FSDataInputStream fis = fs.open(path);
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// Verify SCR read counters
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try {
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fis = fs.open(path);
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byte[] buf = new byte[BUFFER_LENGTH];
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fis.read(0, buf, 0, BUFFER_LENGTH);
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HdfsDataInputStream dfsis = (HdfsDataInputStream) fis;
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Assert.assertEquals(BUFFER_LENGTH,
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dfsis.getReadStatistics().getTotalBytesRead());
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Assert.assertEquals(BUFFER_LENGTH,
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dfsis.getReadStatistics().getTotalShortCircuitBytesRead());
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} finally {
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fis.close();
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fis = null;
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}
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}
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/**
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* Eviction of lazy persisted blocks with Short Circuit Read handle open
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* Note: the test uses faked RAM_DISK from physical disk.
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* @throws IOException
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* @throws InterruptedException
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*/
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@Test (timeout=300000000)
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public void testRamDiskEvictionWithShortCircuitReadHandle()
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throws IOException, InterruptedException {
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startUpCluster(REPL_FACTOR, new StorageType[] { RAM_DISK, DEFAULT },
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(6 * BLOCK_SIZE -1), true); // 5 replica + delta, SCR.
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final String METHOD_NAME = GenericTestUtils.getMethodName();
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Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
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Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
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final int SEED = 0xFADED;
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makeRandomTestFile(path1, BLOCK_SIZE, true, SEED);
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ensureFileReplicasOnStorageType(path1, RAM_DISK);
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// Sleep for a short time to allow the lazy writer thread to do its job.
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// However the block replica should not be evicted from RAM_DISK yet.
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Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
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// No eviction should happen as the free ratio is below the threshold
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FSDataInputStream fis = fs.open(path1);
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try {
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// Keep and open read handle to path1 while creating path2
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byte[] buf = new byte[BUFFER_LENGTH];
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fis.read(0, buf, 0, BUFFER_LENGTH);
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// Create the 2nd file that will trigger RAM_DISK eviction.
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makeTestFile(path2, BLOCK_SIZE * 2, true);
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ensureFileReplicasOnStorageType(path2, RAM_DISK);
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// Ensure path1 is still readable from the open SCR handle.
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fis.read(fis.getPos(), buf, 0, BUFFER_LENGTH);
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HdfsDataInputStream dfsis = (HdfsDataInputStream) fis;
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Assert.assertEquals(2 * BUFFER_LENGTH,
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dfsis.getReadStatistics().getTotalBytesRead());
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Assert.assertEquals(2 * BUFFER_LENGTH,
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dfsis.getReadStatistics().getTotalShortCircuitBytesRead());
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} finally {
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IOUtils.closeQuietly(fis);
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}
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// After the open handle is closed, path1 should be evicted to DISK.
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triggerBlockReport();
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ensureFileReplicasOnStorageType(path1, DEFAULT);
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}
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// ---- Utility functions for all test cases -------------------------------
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/**
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* If ramDiskStorageLimit is >=0, then RAM_DISK capacity is artificially
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* capped. If ramDiskStorageLimit < 0 then it is ignored.
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*/
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private void startUpCluster(final int numDataNodes,
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final StorageType[] storageTypes,
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final long ramDiskStorageLimit,
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final boolean useSCR)
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throws IOException {
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conf = new Configuration();
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conf.setLong(DFS_BLOCK_SIZE_KEY, BLOCK_SIZE);
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conf.setInt(DFS_NAMENODE_LAZY_PERSIST_FILE_SCRUB_INTERVAL_SEC,
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LAZY_WRITE_FILE_SCRUBBER_INTERVAL_SEC);
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conf.setLong(DFS_HEARTBEAT_INTERVAL_KEY, HEARTBEAT_INTERVAL_SEC);
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conf.setInt(DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY,
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HEARTBEAT_RECHECK_INTERVAL_MSEC);
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conf.setInt(DFS_DATANODE_LAZY_WRITER_INTERVAL_SEC,
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LAZY_WRITER_INTERVAL_SEC);
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if (useSCR)
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{
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conf.setBoolean(DFS_CLIENT_READ_SHORTCIRCUIT_KEY,useSCR);
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conf.set(DFSConfigKeys.DFS_CLIENT_CONTEXT,
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UUID.randomUUID().toString());
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conf.set(DFSConfigKeys.DFS_DOMAIN_SOCKET_PATH_KEY,
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new File(sockDir.getDir(),
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"TestShortCircuitLocalReadHandle._PORT.sock").getAbsolutePath());
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conf.set(DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY,
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UserGroupInformation.getCurrentUser().getShortUserName());
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}
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REPL_FACTOR = 1; //Reset in case a test has modified the value
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cluster = new MiniDFSCluster
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.Builder(conf)
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.numDataNodes(numDataNodes)
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.storageTypes(storageTypes != null ? storageTypes : new StorageType[] { DEFAULT, DEFAULT })
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.build();
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fs = cluster.getFileSystem();
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client = fs.getClient();
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// Artificially cap the storage capacity of the RAM_DISK volume.
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if (ramDiskStorageLimit >= 0) {
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List<? extends FsVolumeSpi> volumes =
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cluster.getDataNodes().get(0).getFSDataset().getVolumes();
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for (FsVolumeSpi volume : volumes) {
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if (volume.getStorageType() == RAM_DISK) {
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((FsTransientVolumeImpl) volume).setCapacityForTesting(ramDiskStorageLimit);
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}
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}
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}
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LOG.info("Cluster startup complete");
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}
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private void startUpCluster(final int numDataNodes,
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final StorageType[] storageTypes,
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final long ramDiskStorageLimit)
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throws IOException {
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startUpCluster(numDataNodes, storageTypes, ramDiskStorageLimit, false);
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}
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private void makeTestFile(Path path, long length, final boolean isLazyPersist)
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throws IOException {
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EnumSet<CreateFlag> createFlags = EnumSet.of(CREATE);
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if (isLazyPersist) {
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createFlags.add(LAZY_PERSIST);
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}
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FSDataOutputStream fos = null;
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try {
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fos =
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fs.create(path,
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FsPermission.getFileDefault(),
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createFlags,
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BUFFER_LENGTH,
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REPL_FACTOR,
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BLOCK_SIZE,
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null);
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// Allocate a block.
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byte[] buffer = new byte[BUFFER_LENGTH];
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for (int bytesWritten = 0; bytesWritten < length; ) {
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fos.write(buffer, 0, buffer.length);
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bytesWritten += buffer.length;
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}
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if (length > 0) {
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fos.hsync();
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}
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} finally {
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IOUtils.closeQuietly(fos);
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}
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}
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private LocatedBlocks ensureFileReplicasOnStorageType(
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Path path, StorageType storageType) throws IOException {
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// Ensure that returned block locations returned are correct!
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LOG.info("Ensure path: " + path + " is on StorageType: " + storageType);
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assertThat(fs.exists(path), is(true));
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long fileLength = client.getFileInfo(path.toString()).getLen();
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LocatedBlocks locatedBlocks =
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client.getLocatedBlocks(path.toString(), 0, fileLength);
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for (LocatedBlock locatedBlock : locatedBlocks.getLocatedBlocks()) {
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assertThat(locatedBlock.getStorageTypes()[0], is(storageType));
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}
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return locatedBlocks;
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}
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private void makeRandomTestFile(Path path, long length, final boolean isLazyPersist,
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long seed) throws IOException {
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DFSTestUtil.createFile(fs, path, isLazyPersist, BUFFER_LENGTH, length,
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BLOCK_SIZE, REPL_FACTOR, seed, true);
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}
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private boolean verifyReadRandomFile(
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Path path, int fileLength, int seed) throws IOException {
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byte contents[] = DFSTestUtil.readFileBuffer(fs, path);
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byte expected[] = DFSTestUtil.
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calculateFileContentsFromSeed(seed, fileLength);
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return Arrays.equals(contents, expected);
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}
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private void triggerBlockReport()
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throws IOException, InterruptedException {
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// Trigger block report to NN
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DataNodeTestUtils.triggerBlockReport(cluster.getDataNodes().get(0));
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Thread.sleep(10 * 1000);
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}
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}
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