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HDFS-8144. Split TestLazyPersistFiles into multiple tests. (Arpit Agarwal)

This commit is contained in:
Arpit Agarwal 2015-04-15 10:25:04 -07:00
parent 5004e75332
commit 9e8309a1b2
7 changed files with 594 additions and 458 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -434,6 +434,8 @@ Release 2.8.0 - UNRELEASED
HDFS-8117. More accurate verification in SimulatedFSDataset: replace HDFS-8117. More accurate verification in SimulatedFSDataset: replace
DEFAULT_DATABYTE with patterned data. (Zhe Zhang via wang) DEFAULT_DATABYTE with patterned data. (Zhe Zhang via wang)
HDFS-8144. Split TestLazyPersistFiles into multiple tests. (Arpit Agarwal)
OPTIMIZATIONS OPTIMIZATIONS
HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

1
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/LazyPersistTestCase.java
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@ -64,6 +64,7 @@ import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail; import static org.junit.Assert.fail;
public abstract class LazyPersistTestCase { public abstract class LazyPersistTestCase {
static final byte LAZY_PERSIST_POLICY_ID = (byte) 15;
static { static {
DFSTestUtil.setNameNodeLogLevel(Level.ALL); DFSTestUtil.setNameNodeLogLevel(Level.ALL);

459
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistFiles.java
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@ -48,182 +48,8 @@ import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail; import static org.junit.Assert.fail;
public class TestLazyPersistFiles extends LazyPersistTestCase { public class TestLazyPersistFiles extends LazyPersistTestCase {
private static final byte LAZY_PERSIST_POLICY_ID = (byte) 15;
private static final int THREADPOOL_SIZE = 10; private static final int THREADPOOL_SIZE = 10;
@Test
public void testPolicyNotSetByDefault() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, false);
// Stat the file and check that the LAZY_PERSIST policy is not
// returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), not(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPolicyPropagation() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, true);
// Stat the file and check that the lazyPersist flag is returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPolicyPersistenceInEditLog() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, true);
cluster.restartNameNode(true);
// Stat the file and check that the lazyPersist flag is returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPolicyPersistenceInFsImage() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, true);
// checkpoint
fs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_ENTER);
fs.saveNamespace();
fs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_LEAVE);
cluster.restartNameNode(true);
// Stat the file and check that the lazyPersist flag is returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPlacementOnRamDisk() throws IOException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path, RAM_DISK);
}
@Test
public void testPlacementOnSizeLimitedRamDisk() throws IOException {
startUpCluster(true, 3);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
makeTestFile(path1, BLOCK_SIZE, true);
makeTestFile(path2, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
ensureFileReplicasOnStorageType(path2, RAM_DISK);
}
/**
* Client tries to write LAZY_PERSIST to same DN with no RamDisk configured
* Write should default to disk. No error.
* @throws IOException
*/
@Test
public void testFallbackToDisk() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path, DEFAULT);
}
/**
* File can not fit in RamDisk even with eviction
* @throws IOException
*/
@Test
public void testFallbackToDiskFull() throws Exception {
startUpCluster(false, 0);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path, DEFAULT);
verifyRamDiskJMXMetric("RamDiskBlocksWriteFallback", 1);
}
/**
* File partially fit in RamDisk after eviction.
* RamDisk can fit 2 blocks. Write a file with 5 blocks.
* Expect 2 or less blocks are on RamDisk and 3 or more on disk.
* @throws IOException
*/
@Test
public void testFallbackToDiskPartial()
throws IOException, InterruptedException {
startUpCluster(true, 2);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE * 5, true);
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
triggerBlockReport();
int numBlocksOnRamDisk = 0;
int numBlocksOnDisk = 0;
long fileLength = client.getFileInfo(path.toString()).getLen();
LocatedBlocks locatedBlocks =
client.getLocatedBlocks(path.toString(), 0, fileLength);
for (LocatedBlock locatedBlock : locatedBlocks.getLocatedBlocks()) {
if (locatedBlock.getStorageTypes()[0] == RAM_DISK) {
numBlocksOnRamDisk++;
} else if (locatedBlock.getStorageTypes()[0] == DEFAULT) {
numBlocksOnDisk++;
}
}
// Since eviction is asynchronous, depending on the timing of eviction
// wrt writes, we may get 2 or less blocks on RAM disk.
assert(numBlocksOnRamDisk <= 2);
assert(numBlocksOnDisk >= 3);
}
/**
* If the only available storage is RAM_DISK and the LAZY_PERSIST flag is not
* specified, then block placement should fail.
*
* @throws IOException
*/
@Test
public void testRamDiskNotChosenByDefault() throws IOException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
try {
makeTestFile(path, BLOCK_SIZE, false);
fail("Block placement to RAM_DISK should have failed without lazyPersist flag");
} catch (Throwable t) {
LOG.info("Got expected exception ", t);
}
}
/** /**
* Append to lazy persist file is denied. * Append to lazy persist file is denied.
* @throws IOException * @throws IOException
@ -271,7 +97,7 @@ public class TestLazyPersistFiles extends LazyPersistTestCase {
* 'corrupt' file. * 'corrupt' file.
*/ */
@Test @Test
public void testLazyPersistFilesAreDiscarded() public void testCorruptFilesAreDiscarded()
throws IOException, InterruptedException { throws IOException, InterruptedException {
startUpCluster(true, 2); startUpCluster(true, 2);
final String METHOD_NAME = GenericTestUtils.getMethodName(); final String METHOD_NAME = GenericTestUtils.getMethodName();
@ -304,244 +130,6 @@ public class TestLazyPersistFiles extends LazyPersistTestCase {
is(0L)); is(0L));
} }
@Test
public void testLazyPersistBlocksAreSaved()
throws IOException, InterruptedException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
// Create a test file
makeTestFile(path, BLOCK_SIZE * 10, true);
LocatedBlocks locatedBlocks = ensureFileReplicasOnStorageType(path, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
LOG.info("Verifying copy was saved to lazyPersist/");
// Make sure that there is a saved copy of the replica on persistent
// storage.
ensureLazyPersistBlocksAreSaved(locatedBlocks);
}
/**
* RamDisk eviction after lazy persist to disk.
* @throws Exception
*/
@Test
public void testRamDiskEviction() throws Exception {
startUpCluster(true, 1 + EVICTION_LOW_WATERMARK);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
final int SEED = 0xFADED;
makeRandomTestFile(path1, BLOCK_SIZE, true, SEED);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job.
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Create another file with a replica on RAM_DISK.
makeTestFile(path2, BLOCK_SIZE, true);
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
triggerBlockReport();
// Ensure the first file was evicted to disk, the second is still on
// RAM_DISK.
ensureFileReplicasOnStorageType(path2, RAM_DISK);
ensureFileReplicasOnStorageType(path1, DEFAULT);
verifyRamDiskJMXMetric("RamDiskBlocksEvicted", 1);
verifyRamDiskJMXMetric("RamDiskBlocksEvictedWithoutRead", 1);
}
/**
* RamDisk eviction should not happen on blocks that are not yet
* persisted on disk.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testRamDiskEvictionBeforePersist()
throws IOException, InterruptedException {
startUpCluster(true, 1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
final int SEED = 0XFADED;
// Stop lazy writer to ensure block for path1 is not persisted to disk.
FsDatasetTestUtil.stopLazyWriter(cluster.getDataNodes().get(0));
makeRandomTestFile(path1, BLOCK_SIZE, true, SEED);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Create second file with a replica on RAM_DISK.
makeTestFile(path2, BLOCK_SIZE, true);
// Eviction should not happen for block of the first file that is not
// persisted yet.
ensureFileReplicasOnStorageType(path1, RAM_DISK);
ensureFileReplicasOnStorageType(path2, DEFAULT);
assert(fs.exists(path1));
assert(fs.exists(path2));
assertTrue(verifyReadRandomFile(path1, BLOCK_SIZE, SEED));
}
/**
* Validates lazy persisted blocks are evicted from RAM_DISK based on LRU.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testRamDiskEvictionIsLru()
throws Exception {
final int NUM_PATHS = 5;
startUpCluster(true, NUM_PATHS + EVICTION_LOW_WATERMARK);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path paths[] = new Path[NUM_PATHS * 2];
for (int i = 0; i < paths.length; i++) {
paths[i] = new Path("/" + METHOD_NAME + "." + i +".dat");
}
for (int i = 0; i < NUM_PATHS; i++) {
makeTestFile(paths[i], BLOCK_SIZE, true);
}
// Sleep for a short time to allow the lazy writer thread to do its job.
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
for (int i = 0; i < NUM_PATHS; ++i) {
ensureFileReplicasOnStorageType(paths[i], RAM_DISK);
}
// Open the files for read in a random order.
ArrayList<Integer> indexes = new ArrayList<Integer>(NUM_PATHS);
for (int i = 0; i < NUM_PATHS; ++i) {
indexes.add(i);
}
Collections.shuffle(indexes);
for (int i = 0; i < NUM_PATHS; ++i) {
LOG.info("Touching file " + paths[indexes.get(i)]);
DFSTestUtil.readFile(fs, paths[indexes.get(i)]);
}
// Create an equal number of new files ensuring that the previous
// files are evicted in the same order they were read.
for (int i = 0; i < NUM_PATHS; ++i) {
makeTestFile(paths[i + NUM_PATHS], BLOCK_SIZE, true);
triggerBlockReport();
Thread.sleep(3000);
ensureFileReplicasOnStorageType(paths[i + NUM_PATHS], RAM_DISK);
ensureFileReplicasOnStorageType(paths[indexes.get(i)], DEFAULT);
for (int j = i + 1; j < NUM_PATHS; ++j) {
ensureFileReplicasOnStorageType(paths[indexes.get(j)], RAM_DISK);
}
}
verifyRamDiskJMXMetric("RamDiskBlocksWrite", NUM_PATHS * 2);
verifyRamDiskJMXMetric("RamDiskBlocksWriteFallback", 0);
verifyRamDiskJMXMetric("RamDiskBytesWrite", BLOCK_SIZE * NUM_PATHS * 2);
verifyRamDiskJMXMetric("RamDiskBlocksReadHits", NUM_PATHS);
verifyRamDiskJMXMetric("RamDiskBlocksEvicted", NUM_PATHS);
verifyRamDiskJMXMetric("RamDiskBlocksEvictedWithoutRead", 0);
verifyRamDiskJMXMetric("RamDiskBlocksDeletedBeforeLazyPersisted", 0);
}
/**
* Delete lazy-persist file that has not been persisted to disk.
* Memory is freed up and file is gone.
* @throws IOException
*/
@Test
public void testDeleteBeforePersist()
throws Exception {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
FsDatasetTestUtil.stopLazyWriter(cluster.getDataNodes().get(0));
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
LocatedBlocks locatedBlocks =
ensureFileReplicasOnStorageType(path, RAM_DISK);
// Delete before persist
client.delete(path.toString(), false);
Assert.assertFalse(fs.exists(path));
assertThat(verifyDeletedBlocks(locatedBlocks), is(true));
verifyRamDiskJMXMetric("RamDiskBlocksDeletedBeforeLazyPersisted", 1);
}
/**
* Delete lazy-persist file that has been persisted to disk
* Both memory blocks and disk blocks are deleted.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testDeleteAfterPersist()
throws Exception {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
LocatedBlocks locatedBlocks = ensureFileReplicasOnStorageType(path, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
// Delete after persist
client.delete(path.toString(), false);
Assert.assertFalse(fs.exists(path));
assertThat(verifyDeletedBlocks(locatedBlocks), is(true));
verifyRamDiskJMXMetric("RamDiskBlocksLazyPersisted", 1);
verifyRamDiskJMXMetric("RamDiskBytesLazyPersisted", BLOCK_SIZE);
}
/**
* RAM_DISK used/free space
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testDfsUsageCreateDelete()
throws IOException, InterruptedException {
startUpCluster(true, 4);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
// Get the usage before write BLOCK_SIZE
long usedBeforeCreate = fs.getUsed();
makeTestFile(path, BLOCK_SIZE, true);
long usedAfterCreate = fs.getUsed();
assertThat(usedAfterCreate, is((long) BLOCK_SIZE));
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
long usedAfterPersist = fs.getUsed();
assertThat(usedAfterPersist, is((long) BLOCK_SIZE));
// Delete after persist
client.delete(path.toString(), false);
long usedAfterDelete = fs.getUsed();
assertThat(usedBeforeCreate, is(usedAfterDelete));
}
/** /**
* Concurrent read from the same node and verify the contents. * Concurrent read from the same node and verify the contents.
*/ */
@ -632,51 +220,6 @@ public class TestLazyPersistFiles extends LazyPersistTestCase {
assertThat(testFailed.get(), is(false)); assertThat(testFailed.get(), is(false));
} }
@Test
public void testDnRestartWithSavedReplicas()
throws IOException, InterruptedException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
makeTestFile(path1, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job.
// However the block replica should not be evicted from RAM_DISK yet.
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
LOG.info("Restarting the DataNode");
cluster.restartDataNode(0, true);
cluster.waitActive();
triggerBlockReport();
// Ensure that the replica is now on persistent storage.
ensureFileReplicasOnStorageType(path1, DEFAULT);
}
@Test
public void testDnRestartWithUnsavedReplicas()
throws IOException, InterruptedException {
startUpCluster(true, 1);
FsDatasetTestUtil.stopLazyWriter(cluster.getDataNodes().get(0));
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
makeTestFile(path1, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
LOG.info("Restarting the DataNode");
cluster.restartDataNode(0, true);
cluster.waitActive();
// Ensure that the replica is still on transient storage.
ensureFileReplicasOnStorageType(path1, RAM_DISK);
}
class WriterRunnable implements Runnable { class WriterRunnable implements Runnable {
private final int id; private final int id;
private final Path paths[]; private final Path paths[];

91
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistPolicy.java Normal file
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@ -0,0 +1,91 @@
/**
* 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.datanode.fsdataset.impl;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;
import java.io.IOException;
import static org.hamcrest.core.Is.is;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertThat;
public class TestLazyPersistPolicy extends LazyPersistTestCase {
@Test
public void testPolicyNotSetByDefault() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, false);
// Stat the file and check that the LAZY_PERSIST policy is not
// returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), not(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPolicyPropagation() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, true);
// Stat the file and check that the lazyPersist flag is returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPolicyPersistenceInEditLog() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, true);
cluster.restartNameNode(true);
// Stat the file and check that the lazyPersist flag is returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
}
@Test
public void testPolicyPersistenceInFsImage() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, 0, true);
// checkpoint
fs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_ENTER);
fs.saveNamespace();
fs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_LEAVE);
cluster.restartNameNode(true);
// Stat the file and check that the lazyPersist flag is returned back.
HdfsFileStatus status = client.getFileInfo(path.toString());
assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
}
}

148
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistReplicaPlacement.java Normal file
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@ -0,0 +1,148 @@
/**
* 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.datanode.fsdataset.impl;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.LocatedBlock;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;
import java.io.IOException;
import static org.apache.hadoop.fs.StorageType.DEFAULT;
import static org.apache.hadoop.fs.StorageType.RAM_DISK;
import static org.junit.Assert.fail;
public class TestLazyPersistReplicaPlacement extends LazyPersistTestCase {
@Test
public void testPlacementOnRamDisk() throws IOException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path, RAM_DISK);
}
@Test
public void testPlacementOnSizeLimitedRamDisk() throws IOException {
startUpCluster(true, 3);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
makeTestFile(path1, BLOCK_SIZE, true);
makeTestFile(path2, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
ensureFileReplicasOnStorageType(path2, RAM_DISK);
}
/**
* Client tries to write LAZY_PERSIST to same DN with no RamDisk configured
* Write should default to disk. No error.
* @throws IOException
*/
@Test
public void testFallbackToDisk() throws IOException {
startUpCluster(false, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path, DEFAULT);
}
/**
* File can not fit in RamDisk even with eviction
* @throws IOException
*/
@Test
public void testFallbackToDiskFull() throws Exception {
startUpCluster(false, 0);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path, DEFAULT);
verifyRamDiskJMXMetric("RamDiskBlocksWriteFallback", 1);
}
/**
* File partially fit in RamDisk after eviction.
* RamDisk can fit 2 blocks. Write a file with 5 blocks.
* Expect 2 or less blocks are on RamDisk and 3 or more on disk.
* @throws IOException
*/
@Test
public void testFallbackToDiskPartial()
throws IOException, InterruptedException {
startUpCluster(true, 2);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE * 5, true);
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
triggerBlockReport();
int numBlocksOnRamDisk = 0;
int numBlocksOnDisk = 0;
long fileLength = client.getFileInfo(path.toString()).getLen();
LocatedBlocks locatedBlocks =
client.getLocatedBlocks(path.toString(), 0, fileLength);
for (LocatedBlock locatedBlock : locatedBlocks.getLocatedBlocks()) {
if (locatedBlock.getStorageTypes()[0] == RAM_DISK) {
numBlocksOnRamDisk++;
} else if (locatedBlock.getStorageTypes()[0] == DEFAULT) {
numBlocksOnDisk++;
}
}
// Since eviction is asynchronous, depending on the timing of eviction
// wrt writes, we may get 2 or less blocks on RAM disk.
assert(numBlocksOnRamDisk <= 2);
assert(numBlocksOnDisk >= 3);
}
/**
* If the only available storage is RAM_DISK and the LAZY_PERSIST flag is not
* specified, then block placement should fail.
*
* @throws IOException
*/
@Test
public void testRamDiskNotChosenByDefault() throws IOException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
try {
makeTestFile(path, BLOCK_SIZE, false);
fail("Block placement to RAM_DISK should have failed without lazyPersist flag");
} catch (Throwable t) {
LOG.info("Got expected exception ", t);
}
}
}

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/**
* 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.datanode.fsdataset.impl;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;
import java.io.IOException;
import static org.apache.hadoop.fs.StorageType.DEFAULT;
import static org.apache.hadoop.fs.StorageType.RAM_DISK;
public class TestLazyPersistReplicaRecovery extends LazyPersistTestCase {
@Test
public void testDnRestartWithSavedReplicas()
throws IOException, InterruptedException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
makeTestFile(path1, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job.
// However the block replica should not be evicted from RAM_DISK yet.
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
LOG.info("Restarting the DataNode");
cluster.restartDataNode(0, true);
cluster.waitActive();
triggerBlockReport();
// Ensure that the replica is now on persistent storage.
ensureFileReplicasOnStorageType(path1, DEFAULT);
}
@Test
public void testDnRestartWithUnsavedReplicas()
throws IOException, InterruptedException {
startUpCluster(true, 1);
FsDatasetTestUtil.stopLazyWriter(cluster.getDataNodes().get(0));
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
makeTestFile(path1, BLOCK_SIZE, true);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
LOG.info("Restarting the DataNode");
cluster.restartDataNode(0, true);
cluster.waitActive();
// Ensure that the replica is still on transient storage.
ensureFileReplicasOnStorageType(path1, RAM_DISK);
}
}

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/**
* 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.datanode.fsdataset.impl;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Assert;
import org.junit.Test;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import static org.apache.hadoop.fs.StorageType.DEFAULT;
import static org.apache.hadoop.fs.StorageType.RAM_DISK;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
public class TestLazyWriter extends LazyPersistTestCase {
@Test
public void testLazyPersistBlocksAreSaved()
throws IOException, InterruptedException {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
// Create a test file
makeTestFile(path, BLOCK_SIZE * 10, true);
LocatedBlocks locatedBlocks = ensureFileReplicasOnStorageType(path, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
LOG.info("Verifying copy was saved to lazyPersist/");
// Make sure that there is a saved copy of the replica on persistent
// storage.
ensureLazyPersistBlocksAreSaved(locatedBlocks);
}
/**
* RamDisk eviction after lazy persist to disk.
* @throws Exception
*/
@Test
public void testRamDiskEviction() throws Exception {
startUpCluster(true, 1 + EVICTION_LOW_WATERMARK);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
final int SEED = 0xFADED;
makeRandomTestFile(path1, BLOCK_SIZE, true, SEED);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job.
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Create another file with a replica on RAM_DISK.
makeTestFile(path2, BLOCK_SIZE, true);
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
triggerBlockReport();
// Ensure the first file was evicted to disk, the second is still on
// RAM_DISK.
ensureFileReplicasOnStorageType(path2, RAM_DISK);
ensureFileReplicasOnStorageType(path1, DEFAULT);
verifyRamDiskJMXMetric("RamDiskBlocksEvicted", 1);
verifyRamDiskJMXMetric("RamDiskBlocksEvictedWithoutRead", 1);
}
/**
* RamDisk eviction should not happen on blocks that are not yet
* persisted on disk.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testRamDiskEvictionBeforePersist()
throws IOException, InterruptedException {
startUpCluster(true, 1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path1 = new Path("/" + METHOD_NAME + ".01.dat");
Path path2 = new Path("/" + METHOD_NAME + ".02.dat");
final int SEED = 0XFADED;
// Stop lazy writer to ensure block for path1 is not persisted to disk.
FsDatasetTestUtil.stopLazyWriter(cluster.getDataNodes().get(0));
makeRandomTestFile(path1, BLOCK_SIZE, true, SEED);
ensureFileReplicasOnStorageType(path1, RAM_DISK);
// Create second file with a replica on RAM_DISK.
makeTestFile(path2, BLOCK_SIZE, true);
// Eviction should not happen for block of the first file that is not
// persisted yet.
ensureFileReplicasOnStorageType(path1, RAM_DISK);
ensureFileReplicasOnStorageType(path2, DEFAULT);
assert(fs.exists(path1));
assert(fs.exists(path2));
assertTrue(verifyReadRandomFile(path1, BLOCK_SIZE, SEED));
}
/**
* Validates lazy persisted blocks are evicted from RAM_DISK based on LRU.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testRamDiskEvictionIsLru()
throws Exception {
final int NUM_PATHS = 5;
startUpCluster(true, NUM_PATHS + EVICTION_LOW_WATERMARK);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path paths[] = new Path[NUM_PATHS * 2];
for (int i = 0; i < paths.length; i++) {
paths[i] = new Path("/" + METHOD_NAME + "." + i +".dat");
}
for (int i = 0; i < NUM_PATHS; i++) {
makeTestFile(paths[i], BLOCK_SIZE, true);
}
// Sleep for a short time to allow the lazy writer thread to do its job.
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
for (int i = 0; i < NUM_PATHS; ++i) {
ensureFileReplicasOnStorageType(paths[i], RAM_DISK);
}
// Open the files for read in a random order.
ArrayList<Integer> indexes = new ArrayList<Integer>(NUM_PATHS);
for (int i = 0; i < NUM_PATHS; ++i) {
indexes.add(i);
}
Collections.shuffle(indexes);
for (int i = 0; i < NUM_PATHS; ++i) {
LOG.info("Touching file " + paths[indexes.get(i)]);
DFSTestUtil.readFile(fs, paths[indexes.get(i)]);
}
// Create an equal number of new files ensuring that the previous
// files are evicted in the same order they were read.
for (int i = 0; i < NUM_PATHS; ++i) {
makeTestFile(paths[i + NUM_PATHS], BLOCK_SIZE, true);
triggerBlockReport();
Thread.sleep(3000);
ensureFileReplicasOnStorageType(paths[i + NUM_PATHS], RAM_DISK);
ensureFileReplicasOnStorageType(paths[indexes.get(i)], DEFAULT);
for (int j = i + 1; j < NUM_PATHS; ++j) {
ensureFileReplicasOnStorageType(paths[indexes.get(j)], RAM_DISK);
}
}
verifyRamDiskJMXMetric("RamDiskBlocksWrite", NUM_PATHS * 2);
verifyRamDiskJMXMetric("RamDiskBlocksWriteFallback", 0);
verifyRamDiskJMXMetric("RamDiskBytesWrite", BLOCK_SIZE * NUM_PATHS * 2);
verifyRamDiskJMXMetric("RamDiskBlocksReadHits", NUM_PATHS);
verifyRamDiskJMXMetric("RamDiskBlocksEvicted", NUM_PATHS);
verifyRamDiskJMXMetric("RamDiskBlocksEvictedWithoutRead", 0);
verifyRamDiskJMXMetric("RamDiskBlocksDeletedBeforeLazyPersisted", 0);
}
/**
* Delete lazy-persist file that has not been persisted to disk.
* Memory is freed up and file is gone.
* @throws IOException
*/
@Test
public void testDeleteBeforePersist()
throws Exception {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
FsDatasetTestUtil.stopLazyWriter(cluster.getDataNodes().get(0));
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
LocatedBlocks locatedBlocks =
ensureFileReplicasOnStorageType(path, RAM_DISK);
// Delete before persist
client.delete(path.toString(), false);
Assert.assertFalse(fs.exists(path));
assertThat(verifyDeletedBlocks(locatedBlocks), is(true));
verifyRamDiskJMXMetric("RamDiskBlocksDeletedBeforeLazyPersisted", 1);
}
/**
* Delete lazy-persist file that has been persisted to disk
* Both memory blocks and disk blocks are deleted.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testDeleteAfterPersist()
throws Exception {
startUpCluster(true, -1);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
makeTestFile(path, BLOCK_SIZE, true);
LocatedBlocks locatedBlocks = ensureFileReplicasOnStorageType(path, RAM_DISK);
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
// Delete after persist
client.delete(path.toString(), false);
Assert.assertFalse(fs.exists(path));
assertThat(verifyDeletedBlocks(locatedBlocks), is(true));
verifyRamDiskJMXMetric("RamDiskBlocksLazyPersisted", 1);
verifyRamDiskJMXMetric("RamDiskBytesLazyPersisted", BLOCK_SIZE);
}
/**
* RAM_DISK used/free space
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testDfsUsageCreateDelete()
throws IOException, InterruptedException {
startUpCluster(true, 4);
final String METHOD_NAME = GenericTestUtils.getMethodName();
Path path = new Path("/" + METHOD_NAME + ".dat");
// Get the usage before write BLOCK_SIZE
long usedBeforeCreate = fs.getUsed();
makeTestFile(path, BLOCK_SIZE, true);
long usedAfterCreate = fs.getUsed();
assertThat(usedAfterCreate, is((long) BLOCK_SIZE));
// Sleep for a short time to allow the lazy writer thread to do its job
Thread.sleep(3 * LAZY_WRITER_INTERVAL_SEC * 1000);
long usedAfterPersist = fs.getUsed();
assertThat(usedAfterPersist, is((long) BLOCK_SIZE));
// Delete after persist
client.delete(path.toString(), false);
long usedAfterDelete = fs.getUsed();
assertThat(usedBeforeCreate, is(usedAfterDelete));
}
}