/**
* 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;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_PROXY_PROVIDER_KEY_PREFIX;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.lang.reflect.Field;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import javax.net.SocketFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider;
import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.net.ConnectTimeoutException;
import org.apache.hadoop.net.StandardSocketFactory;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.util.StringUtils;
import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.junit.After;
import org.junit.Assume;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mockito;
import sun.net.spi.nameservice.NameService;
public class TestDFSClientFailover {
private static final Log LOG = LogFactory.getLog(TestDFSClientFailover.class);
private static final Path TEST_FILE = new Path("/tmp/failover-test-file");
private static final int FILE_LENGTH_TO_VERIFY = 100;
private Configuration conf = new Configuration();
private MiniDFSCluster cluster;
@Before
public void setUpCluster() throws IOException {
cluster = new MiniDFSCluster.Builder(conf)
.nnTopology(MiniDFSNNTopology.simpleHATopology())
.build();
cluster.transitionToActive(0);
cluster.waitActive();
}
@After
public void tearDownCluster() throws IOException {
cluster.shutdown();
}
/**
* Make sure that client failover works when an active NN dies and the standby
* takes over.
*/
@Test
public void testDfsClientFailover() throws IOException, URISyntaxException {
FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
DFSTestUtil.createFile(fs, TEST_FILE,
FILE_LENGTH_TO_VERIFY, (short)1, 1L);
assertEquals(fs.getFileStatus(TEST_FILE).getLen(), FILE_LENGTH_TO_VERIFY);
cluster.shutdownNameNode(0);
cluster.transitionToActive(1);
assertEquals(fs.getFileStatus(TEST_FILE).getLen(), FILE_LENGTH_TO_VERIFY);
// Check that it functions even if the URL becomes canonicalized
// to include a port number.
Path withPort = new Path("hdfs://" +
HATestUtil.getLogicalHostname(cluster) + ":" +
NameNode.DEFAULT_PORT + "/" + TEST_FILE.toUri().getPath());
FileSystem fs2 = withPort.getFileSystem(fs.getConf());
assertTrue(fs2.exists(withPort));
fs.close();
}
/**
* Test that even a non-idempotent method will properly fail-over if the
* first IPC attempt times out trying to connect. Regression test for
* HDFS-4404.
*/
@Test
public void testFailoverOnConnectTimeout() throws Exception {
conf.setClass(CommonConfigurationKeysPublic.HADOOP_RPC_SOCKET_FACTORY_CLASS_DEFAULT_KEY,
InjectingSocketFactory.class, SocketFactory.class);
// Set up the InjectingSocketFactory to throw a ConnectTimeoutException
// when connecting to the first NN.
InjectingSocketFactory.portToInjectOn = cluster.getNameNodePort(0);
FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
// Make the second NN the active one.
cluster.shutdownNameNode(0);
cluster.transitionToActive(1);
// Call a non-idempotent method, and ensure the failover of the call proceeds
// successfully.
IOUtils.closeStream(fs.create(TEST_FILE));
}
private static class InjectingSocketFactory extends StandardSocketFactory {
static SocketFactory defaultFactory = SocketFactory.getDefault();
static int portToInjectOn;
@Override
public Socket createSocket() throws IOException {
Socket spy = Mockito.spy(defaultFactory.createSocket());
// Simplify our spying job by not having to also spy on the channel
Mockito.doReturn(null).when(spy).getChannel();
// Throw a ConnectTimeoutException when connecting to our target "bad"
// host.
Mockito.doThrow(new ConnectTimeoutException("injected"))
.when(spy).connect(
Mockito.argThat(new MatchesPort()),
Mockito.anyInt());
return spy;
}
private class MatchesPort extends BaseMatcher<SocketAddress> {
@Override
public boolean matches(Object arg0) {
return ((InetSocketAddress)arg0).getPort() == portToInjectOn;
}
@Override
public void describeTo(Description desc) {
desc.appendText("matches port " + portToInjectOn);
}
}
}
/**
* Regression test for HDFS-2683.
*/
@Test
public void testLogicalUriShouldNotHavePorts() {
Configuration conf = new HdfsConfiguration();
conf.set(DFS_CLIENT_FAILOVER_PROXY_PROVIDER_KEY_PREFIX + ".foo",
ConfiguredFailoverProxyProvider.class.getName());
Path p = new Path("hdfs://foo:12345/");
try {
p.getFileSystem(conf).exists(p);
fail("Did not fail with fake FS");
} catch (IOException ioe) {
GenericTestUtils.assertExceptionContains(
"does not use port information", ioe);
}
}
/**
* Make sure that a helpful error message is shown if a proxy provider is
* configured for a given URI, but no actual addresses are configured for that
* URI.
*/
@Test
public void testFailureWithMisconfiguredHaNNs() throws Exception {
String logicalHost = "misconfigured-ha-uri";
Configuration conf = new Configuration();
conf.set(DFS_CLIENT_FAILOVER_PROXY_PROVIDER_KEY_PREFIX + "." + logicalHost,
ConfiguredFailoverProxyProvider.class.getName());
URI uri = new URI("hdfs://" + logicalHost + "/test");
try {
FileSystem.get(uri, conf).exists(new Path("/test"));
fail("Successfully got proxy provider for misconfigured FS");
} catch (IOException ioe) {
LOG.info("got expected exception", ioe);
assertTrue("expected exception did not contain helpful message",
StringUtils.stringifyException(ioe).contains(
"Could not find any configured addresses for URI " + uri));
}
}
/**
* Spy on the Java DNS infrastructure.
* This likely only works on Sun-derived JDKs, but uses JUnit's
* Assume functionality so that any tests using it are skipped on
* incompatible JDKs.
*/
private NameService spyOnNameService() {
try {
Field f = InetAddress.class.getDeclaredField("nameServices");
f.setAccessible(true);
Assume.assumeNotNull(f);
@SuppressWarnings("unchecked")
List<NameService> nsList = (List<NameService>) f.get(null);
NameService ns = nsList.get(0);
Log log = LogFactory.getLog("NameServiceSpy");
ns = Mockito.mock(NameService.class,
new GenericTestUtils.DelegateAnswer(log, ns));
nsList.set(0, ns);
return ns;
} catch (Throwable t) {
LOG.info("Unable to spy on DNS. Skipping test.", t);
// In case the JDK we're testing on doesn't work like Sun's, just
// skip the test.
Assume.assumeNoException(t);
throw new RuntimeException(t);
}
}
/**
* Test that the client doesn't ever try to DNS-resolve the logical URI.
* Regression test for HADOOP-9150.
*/
@Test
public void testDoesntDnsResolveLogicalURI() throws Exception {
NameService spyNS = spyOnNameService();
FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
String logicalHost = fs.getUri().getHost();
Path qualifiedRoot = fs.makeQualified(new Path("/"));
// Make a few calls against the filesystem.
fs.getCanonicalServiceName();
fs.listStatus(qualifiedRoot);
// Ensure that the logical hostname was never resolved.
Mockito.verify(spyNS, Mockito.never()).lookupAllHostAddr(Mockito.eq(logicalHost));
}
/**
* Same test as above, but for FileContext.
*/
@Test
public void testFileContextDoesntDnsResolveLogicalURI() throws Exception {
NameService spyNS = spyOnNameService();
FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
String logicalHost = fs.getUri().getHost();
Configuration haClientConf = fs.getConf();
FileContext fc = FileContext.getFileContext(haClientConf);
Path root = new Path("/");
fc.listStatus(root);
fc.listStatus(fc.makeQualified(root));
fc.getDefaultFileSystem().getCanonicalServiceName();
// Ensure that the logical hostname was never resolved.
Mockito.verify(spyNS, Mockito.never()).lookupAllHostAddr(Mockito.eq(logicalHost));
}
}