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HDFS-2623. Add test case for hot standby capability. Contributed by Todd Lipcon.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1209256 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2011-12-01 21:37:08 +00:00
parent f4fa76719e
commit 28dbd56de0
5 changed files with 137 additions and 10 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt
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@ -37,3 +37,5 @@ HDFS-2616. Change DatanodeProtocol#sendHeartbeat() to return HeartbeatResponse.
HDFS-2622. Fix TestDFSUpgrade in HA branch. (todd)
HDFS-2612. Handle refreshNameNodes in federated HA clusters (todd)
HDFS-2623. Add test case for hot standby capability (todd)

2
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/AppendTestUtil.java
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@ -109,7 +109,7 @@ static void write(OutputStream out, int offset, int length) throws IOException {
out.write(bytes);
}
static void check(FileSystem fs, Path p, long length) throws IOException {
public static void check(FileSystem fs, Path p, long length) throws IOException {
int i = -1;
try {
final FileStatus status = fs.getFileStatus(p);

24
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientFailover.java
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@ -82,13 +82,28 @@ public void testDfsClientFailover() throws IOException, URISyntaxException {
AppendTestUtil.write(out2, 0, FILE_LENGTH_TO_VERIFY);
out1.close();
out2.close();
FileSystem fs = configureFailoverFs(cluster, conf);
AppendTestUtil.check(fs, TEST_FILE, FILE_LENGTH_TO_VERIFY);
cluster.getNameNode(0).stop();
AppendTestUtil.check(fs, TEST_FILE, FILE_LENGTH_TO_VERIFY);
fs.close();
}
public static FileSystem configureFailoverFs(MiniDFSCluster cluster, Configuration conf)
throws IOException, URISyntaxException {
InetSocketAddress nnAddr1 = cluster.getNameNode(0).getNameNodeAddress();
InetSocketAddress nnAddr2 = cluster.getNameNode(1).getNameNodeAddress();
String nsId = "nameserviceId1";
final String logicalNameNodeId = "ha-nn-uri";
String nameNodeId1 = "nn1";
String nameNodeId2 = "nn2";
conf = new Configuration(conf);
String address1 = "hdfs://" + nnAddr1.getHostName() + ":" + nnAddr1.getPort();
String address2 = "hdfs://" + nnAddr2.getHostName() + ":" + nnAddr2.getPort();
conf.set(DFSUtil.addKeySuffixes(DFS_NAMENODE_RPC_ADDRESS_KEY,
@ -103,12 +118,7 @@ public void testDfsClientFailover() throws IOException, URISyntaxException {
ConfiguredFailoverProxyProvider.class.getName());
FileSystem fs = FileSystem.get(new URI("hdfs://" + logicalNameNodeId), conf);
AppendTestUtil.check(fs, TEST_FILE, FILE_LENGTH_TO_VERIFY);
cluster.getNameNode(0).stop();
AppendTestUtil.check(fs, TEST_FILE, FILE_LENGTH_TO_VERIFY);
fs.close();
return fs;
}
}
}

9
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestEditLogTailer.java
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@ -33,6 +33,7 @@
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.log4j.Level;
import org.junit.Assert;
import org.junit.Test;
public class TestEditLogTailer {
@ -99,12 +100,13 @@ private static String getDirPath(int suffix) {
return DIR_PREFIX + suffix;
}
private static void waitForStandbyToCatchUp(NameNode active,
static void waitForStandbyToCatchUp(NameNode active,
NameNode standby) throws InterruptedException, IOException {
long activeTxId = active.getNamesystem().getFSImage().getEditLog()
.getLastWrittenTxId();
// TODO: we should really just ask for a log roll here
doSaveNamespace(active);
long start = System.currentTimeMillis();
@ -112,10 +114,13 @@ private static void waitForStandbyToCatchUp(NameNode active,
long nn2HighestTxId = standby.getNamesystem().getFSImage()
.getLastAppliedTxId();
if (nn2HighestTxId >= activeTxId) {
break;
return;
}
Thread.sleep(SLEEP_TIME);
}
Assert.fail("Standby did not catch up to txid " + activeTxId +
" (currently at " +
standby.getNamesystem().getFSImage().getLastAppliedTxId() + ")");
}
private static void doSaveNamespace(NameNode nn)

110
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestStandbyIsHot.java Normal file
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@ -0,0 +1,110 @@
/**
* 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.ha;
import static org.junit.Assert.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.AppendTestUtil;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.MiniDFSNNTopology;
import org.apache.hadoop.hdfs.TestDFSClientFailover;
import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;
import com.google.common.base.Supplier;
/**
* The hotornot.com of unit tests: makes sure that the standby not only
* has namespace information, but also has the correct block reports, etc.
*/
public class TestStandbyIsHot {
protected static final Log LOG = LogFactory.getLog(
TestStandbyIsHot.class);
private static final String TEST_FILE_DATA = "hello highly available world";
private static final String TEST_FILE = "/testStandbyIsHot";
private static final Path TEST_FILE_PATH = new Path(TEST_FILE);
@Test
public void testStandbyIsHot() throws Exception {
Configuration conf = new Configuration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
.nnTopology(MiniDFSNNTopology.simpleHATopology())
.numDataNodes(3)
.build();
try {
cluster.waitActive();
cluster.transitionToActive(0);
NameNode nn1 = cluster.getNameNode(0);
NameNode nn2 = cluster.getNameNode(1);
nn2.getNamesystem().getEditLogTailer().setSleepTime(250);
nn2.getNamesystem().getEditLogTailer().interrupt();
FileSystem fs = TestDFSClientFailover.configureFailoverFs(cluster, conf);
Thread.sleep(1000);
System.err.println("==================================");
DFSTestUtil.writeFile(fs, TEST_FILE_PATH, TEST_FILE_DATA);
// Have to force an edit log roll so that the standby catches up
nn1.getRpcServer().rollEditLog();
System.err.println("==================================");
waitForBlockLocations(nn2, TEST_FILE, 3);
nn1.stop();
cluster.transitionToActive(1);
assertEquals(TEST_FILE_DATA, DFSTestUtil.readFile(fs, TEST_FILE_PATH));
} finally {
cluster.shutdown();
}
}
private void waitForBlockLocations(final NameNode nn,
final String path, final int expectedReplicas)
throws Exception {
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
try {
LocatedBlocks locs = NameNodeAdapter.getBlockLocations(nn, path, 0, 1000);
LOG.info("Got locs: " + locs);
return locs.getLastLocatedBlock().getLocations().length == expectedReplicas;
} catch (IOException e) {
LOG.warn("No block locations yet: " + e.getMessage());
return false;
}
}
}, 500, 10000);
}
}